From 78af2b4630ccde4b03659a259f739f83ae0de9ec Mon Sep 17 00:00:00 2001
From: rojaro <>
Date: Mon, 13 Jul 2009 14:02:17 +0000
Subject: - ActiveRecord Port from Yii ... not perfect but works ^^

---
 .../DEPRECATED_COMPATIBILITY_REASONS_ONLY          |    3 +
 .../Relations/TActiveRecordRelationContext.php     |  230 +++
 framework/Db/ActiveRecord/TActiveFinder.php        | 1279 ++++++++++++++
 framework/Db/ActiveRecord/TActiveRecord.php        | 1843 ++++++++++++++++++++
 .../Db/ActiveRecord/TActiveRecordBehavior.php      |   94 +
 .../Db/ActiveRecord/TActiveRecordCriteria.php      |  254 +++
 6 files changed, 3703 insertions(+)
 create mode 100644 framework/Db/ActiveRecord/Relations/DEPRECATED_COMPATIBILITY_REASONS_ONLY
 create mode 100644 framework/Db/ActiveRecord/Relations/TActiveRecordRelationContext.php
 create mode 100644 framework/Db/ActiveRecord/TActiveFinder.php
 create mode 100644 framework/Db/ActiveRecord/TActiveRecord.php
 create mode 100644 framework/Db/ActiveRecord/TActiveRecordBehavior.php
 create mode 100644 framework/Db/ActiveRecord/TActiveRecordCriteria.php

(limited to 'framework/Db/ActiveRecord')

diff --git a/framework/Db/ActiveRecord/Relations/DEPRECATED_COMPATIBILITY_REASONS_ONLY b/framework/Db/ActiveRecord/Relations/DEPRECATED_COMPATIBILITY_REASONS_ONLY
new file mode 100644
index 00000000..8c7a4073
--- /dev/null
+++ b/framework/Db/ActiveRecord/Relations/DEPRECATED_COMPATIBILITY_REASONS_ONLY
@@ -0,0 +1,3 @@
+Please note that this file is used for old Prado ActiveRecord applications which use $record->withAnotherRecord - syntax.
+
+You shouln't use that syntax anymore as it's deprecated in this portation of Yii ActiveRecords.
diff --git a/framework/Db/ActiveRecord/Relations/TActiveRecordRelationContext.php b/framework/Db/ActiveRecord/Relations/TActiveRecordRelationContext.php
new file mode 100644
index 00000000..696bb5b1
--- /dev/null
+++ b/framework/Db/ActiveRecord/Relations/TActiveRecordRelationContext.php
@@ -0,0 +1,230 @@
+<?php
+/**
+ * TActiveRecordRelationContext class.
+ *
+ * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
+ * @link http://www.pradosoft.com/
+ * @copyright Copyright &copy; 2005-2008 PradoSoft
+ * @license http://www.pradosoft.com/license/
+ * @version $Id$
+ * @package System.Data.ActiveRecord.Relations
+ */
+
+/**
+ * TActiveRecordRelationContext holds information regarding record relationships
+ * such as record relation property name, query criteria and foreign object record
+ * class names.
+ *
+ * This class is use internally by passing a context to the TActiveRecordRelation
+ * constructor.
+ *
+ * @author Wei Zhuo <weizho[at]gmail[dot]com>
+ * @version $Id$
+ * @package System.Data.ActiveRecord.Relations
+ * @since 3.1
+ */
+class TActiveRecordRelationContext
+{
+	private $_property;
+	private $_record;
+	private $_relation; //data from an entry of TActiveRecord::$RELATION
+	private $_fkeys;
+
+	public function __construct($record, $property=null, $relation=null)
+	{
+		$this->_record=$record;
+		$this->_property=$property;
+		$this->_relation=$relation;
+	}
+
+	/**
+	 * @return boolean true if the relation is defined in TActiveRecord::$RELATIONS
+	 * @since 3.1.2
+	 */
+	public function hasRecordRelation()
+	{
+		return $this->_relation!==null;
+	}
+
+	public function getPropertyValue()
+	{
+		$obj = $this->getSourceRecord();
+		return $obj->getColumnValue($this->getProperty());
+	}
+
+	/**
+	 * @return string name of the record property that the relationship results will be assigned to.
+	 */
+	public function getProperty()
+	{
+		return $this->_property;
+	}
+
+	/**
+	 * @return TActiveRecord the active record instance that queried for its related records.
+	 */
+	public function getSourceRecord()
+	{
+		return $this->_record;
+	}
+
+	/**
+	 * @return array foreign key of this relations, the keys is dependent on the
+	 * relationship type.
+	 * @since 3.1.2
+	 */
+	public function getRelationForeignKeys()
+	{
+		if($this->_fkeys===null)
+			$this->_fkeys=$this->getRelationHandler()->getRelationForeignKeys();
+		return $this->_fkeys;
+	}
+
+	/**
+	 * @return string HAS_MANY, HAS_ONE, or BELONGS_TO
+	 */
+	public function getRelationType()
+	{
+		return $this->_relation[0];
+	}
+
+	/**
+	 * @return string foreign record class name.
+	 */
+	public function getForeignRecordClass()
+	{
+		return $this->_relation[1];
+	}
+
+	/**
+	 * @return string foreign key field names, comma delimited.
+	 * @since 3.1.2
+	 */
+	public function getFkField()
+	{
+		return $this->_relation[2];
+	}
+
+	/**
+	 * @return string the query condition for the relation as specified in RELATIONS
+	 * @since 3.1.2
+	 */
+	public function getCondition()
+	{
+		return isset($this->_relation[3])?$this->_relation[3]:null;
+	}
+
+	/**
+	 * @return array the query parameters for the relation as specified in RELATIONS
+	 * @since 3.1.2
+	 */
+	public function getParameters()
+	{
+		return isset($this->_relation[4])?$this->_relation[4]:array();
+	}
+
+	/**
+	 * @return boolean true if the 3rd element of an TActiveRecord::$RELATION entry is set.
+	 * @since 3.1.2
+	 */
+	public function hasFkField()
+	{
+		$notManyToMany = $this->getRelationType() !== TActiveRecord::MANY_TO_MANY;
+		return $notManyToMany && isset($this->_relation[2]) && !empty($this->_relation[2]);
+	}
+
+	/**
+	 * @return string the M-N relationship association table name.
+	 */
+	public function getAssociationTable()
+	{
+		return $this->_relation[2];
+	}
+
+	/**
+	 * @return boolean true if the relationship is HAS_MANY and requires an association table.
+	 */
+	public function hasAssociationTable()
+	{
+		$isManyToMany = $this->getRelationType() === TActiveRecord::MANY_TO_MANY;
+		return $isManyToMany && isset($this->_relation[2]) && !empty($this->_relation[2]);
+	}
+
+	/**
+	 * @return TActiveRecord corresponding relationship foreign object finder instance.
+	 */
+	public function getForeignRecordFinder()
+	{
+		return TActiveRecord::finder($this->getForeignRecordClass());
+	}
+
+	/**
+	 * Creates and return the TActiveRecordRelation handler for specific relationships.
+	 * An instance of TActiveRecordHasOne, TActiveRecordBelongsTo, TActiveRecordHasMany,
+	 * or TActiveRecordHasManyAssocation will be returned.
+	 * @param TActiveRecordCriteria search criteria
+	 * @return TActiveRecordRelation record relationship handler instnace.
+	 * @throws TActiveRecordException if property is not defined or missing.
+	 */
+	public function getRelationHandler($criteria=null)
+	{
+		if(!$this->hasRecordRelation())
+		{
+			throw new TActiveRecordException('ar_undefined_relation_prop',
+				$this->_property, get_class($this->_record), 'RELATIONS');
+		}
+		if($criteria===null)
+			$criteria = new TActiveRecordCriteria($this->getCondition(), $this->getParameters());
+		switch($this->getRelationType())
+		{
+			case TActiveRecord::HAS_MANY:
+				Prado::using('System.Data.ActiveRecord.Relations.TActiveRecordHasMany');
+				return new TActiveRecordHasMany($this, $criteria);
+			case TActiveRecord::MANY_TO_MANY:
+				Prado::using('System.Data.ActiveRecord.Relations.TActiveRecordHasManyAssociation');
+				return new TActiveRecordHasManyAssociation($this, $criteria);
+			case TActiveRecord::HAS_ONE:
+				Prado::using('System.Data.ActiveRecord.Relations.TActiveRecordHasOne');
+				return new TActiveRecordHasOne($this, $criteria);
+			case TActiveRecord::BELONGS_TO:
+				Prado::using('System.Data.ActiveRecord.Relations.TActiveRecordBelongsTo');
+				return new TActiveRecordBelongsTo($this, $criteria);
+			default:
+				throw new TActiveRecordException('ar_invalid_relationship');
+		}
+	}
+
+	/**
+	 * @return TActiveRecordRelationCommand
+	 */
+	public function updateAssociatedRecords($updateBelongsTo=false)
+	{
+		$success=true;
+		foreach($this->_record->getRecordRelations() as $data)
+		{
+			list($property, $relation) = $data;
+			$belongsTo = $relation[0]==TActiveRecord::BELONGS_TO;
+			if(($updateBelongsTo && $belongsTo) || (!$updateBelongsTo && !$belongsTo))
+			{
+				$obj = $this->getSourceRecord();
+				if(!$this->isEmptyFkObject($obj->getColumnValue($property)))
+				{
+					$context = new TActiveRecordRelationContext($this->getSourceRecord(),$property,$relation);
+					$success = $context->getRelationHandler()->updateAssociatedRecords() && $success;
+				}
+			}
+		}
+		return $success;
+	}
+
+	protected function isEmptyFkObject($obj)
+	{
+		if(is_object($obj))
+			return $obj instanceof TList ? $obj->count() === 0 : false;
+		else if(is_array($obj))
+			return count($obj)===0;
+		else
+			return empty($obj);
+	}
+}
+
diff --git a/framework/Db/ActiveRecord/TActiveFinder.php b/framework/Db/ActiveRecord/TActiveFinder.php
new file mode 100644
index 00000000..d55074c0
--- /dev/null
+++ b/framework/Db/ActiveRecord/TActiveFinder.php
@@ -0,0 +1,1279 @@
+<?php
+/**
+ * CActiveRecord class file.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright &copy; 2008-2009 Yii Software LLC
+ * @license http://www.yiiframework.com/license/CBaseActiveRelation*/
+
+/**
+ * CActiveFinder implements eager loading and lazy loading of related active records.
+ *
+ * When used in eager loading, this class provides the same set of find methods as
+ * {@link CActiveRecord}.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id: CActiveFinder.php 1127 2009-06-13 20:26:35Z qiang.xue $
+ * @package System.Db.ActiveRecord
+ * @since 1.0
+ */
+class TActiveFinder extends TComponent
+{
+	/**
+	 * @var boolean join all tables all at once. Defaults to false.
+	 * This property is internally used.
+	 * @since 1.0.2
+	 */
+	public $joinAll=false;
+	/**
+	 * @var boolean whether the base model has limit or offset.
+	 * This property is internally used.
+	 * @since 1.0.2
+	 */
+	public $baseLimited=false;
+
+	private $_joinCount=0;
+	private $_joinTree;
+	private $_builder;
+	private $_criteria;  // the criteria generated via named scope
+
+	/**
+	 * Constructor.
+	 * A join tree is built up based on the declared relationships between active record classes.
+	 * @param CActiveRecord the model that initiates the active finding process
+	 * @param mixed the relation names to be actively looked for
+	 * @param CDbCriteria the criteria associated with the named scopes (since version 1.0.5)
+	 */
+	public function __construct($model,$with,$criteria=null)
+	{
+		$this->_criteria=$criteria;
+		$this->_builder=$model->getCommandBuilder();
+		$this->_joinTree=new TJoinElement($this,$model);
+		$this->buildJoinTree($this->_joinTree,$with);
+	}
+
+	/**
+	 * Uses the most aggressive join approach.
+	 * By calling this method, even if there is LIMIT/OFFSET option set for
+	 * the primary table query, we will still use a single SQL statement.
+	 * By default (without calling this method), the primary table will be queried
+	 * by itself so that LIMIT/OFFSET can be correctly applied.
+	 * @return CActiveFinder the finder object
+	 * @since 1.0.2
+	 */
+	public function together()
+	{
+		$this->joinAll=true;
+		return $this;
+	}
+
+	private function query($criteria,$all=false)
+	{
+		if($this->_criteria!==null)
+		{
+			$this->_criteria->mergeWith($criteria);
+			$criteria=$this->_criteria;
+		}
+
+		$this->_joinTree->find($criteria);
+		$this->_joinTree->afterFind();
+
+		if($all)
+			return array_values($this->_joinTree->records);
+		else if(count($this->_joinTree->records))
+			return reset($this->_joinTree->records);
+		else
+			return null;
+	}
+
+	/**
+	 * This is the relational version of {@link CActiveRecord::find()}.
+	 */
+	public function find($condition='',$params=array())
+	{
+		Prado::trace(get_class($this->_joinTree->model).'.find() eagerly','System.Db.ActiveRecord.TActiveRecord');
+		$criteria=$this->_builder->createCriteria($condition,$params);
+		return $this->query($criteria);
+	}
+
+	/**
+	 * This is the relational version of {@link CActiveRecord::findAll()}.
+	 */
+	public function findAll($condition='',$params=array())
+	{
+		Prado::trace(get_class($this->_joinTree->model).'.findAll() eagerly','System.Db.ActiveRecord.TActiveRecord');
+		$criteria=$this->_builder->createCriteria($condition,$params);
+		return $this->query($criteria,true);
+	}
+
+	/**
+	 * This is the relational version of {@link CActiveRecord::findByPk()}.
+	 */
+	public function findByPk($pk,$condition='',$params=array())
+	{
+		Prado::trace(get_class($this->_joinTree->model).'.findByPk() eagerly','System.Db.ActiveRecord.TActiveRecord');
+		$criteria=$this->_builder->createPkCriteria($this->_joinTree->model->getTableSchema(),$pk,$condition,$params);
+		return $this->query($criteria);
+	}
+
+	/**
+	 * This is the relational version of {@link CActiveRecord::findAllByPk()}.
+	 */
+	public function findAllByPk($pk,$condition='',$params=array())
+	{
+		Prado::trace(get_class($this->_joinTree->model).'.findAllByPk() eagerly','System.Db.ActiveRecord.TActiveRecord');
+		$criteria=$this->_builder->createPkCriteria($this->_joinTree->model->getTableSchema(),$pk,$condition,$params);
+		return $this->query($criteria,true);
+	}
+
+	/**
+	 * This is  the relational version of {@link CActiveRecord::findByAttributes()}.
+	 */
+	public function findByAttributes($attributes,$condition='',$params=array())
+	{
+		Prado::trace(get_class($this->_joinTree->model).'.findByAttributes() eagerly','System.Db.ActiveRecord.TActiveRecord');
+		$criteria=$this->_builder->createColumnCriteria($this->_joinTree->model->getTableSchema(),$attributes,$condition,$params);
+		return $this->query($criteria);
+	}
+
+	/**
+	 * This is the relational version of {@link CActiveRecord::findAllByAttributes()}.
+	 */
+	public function findAllByAttributes($attributes,$condition='',$params=array())
+	{
+		Prado::trace(get_class($this->_joinTree->model).'.findAllByAttributes() eagerly','System.Db.ActiveRecord.TActiveRecord');
+		$criteria=$this->_builder->createColumnCriteria($this->_joinTree->model->getTableSchema(),$attributes,$condition,$params);
+		return $this->query($criteria,true);
+	}
+
+	/**
+	 * This is the relational version of {@link CActiveRecord::findBySql()}.
+	 */
+	public function findBySql($sql,$params=array())
+	{
+		Prado::trace(get_class($this->_joinTree->model).'.findBySql() eagerly','System.Db.ActiveRecord.TActiveRecord');
+		if(($row=$this->_builder->createSqlCommand($sql,$params)->queryRow())!==false)
+		{
+			$baseRecord=$this->_joinTree->model->populateRecord($row,false);
+			$this->_joinTree->findWithBase($baseRecord);
+			$this->_joinTree->afterFind();
+			return $baseRecord;
+		}
+	}
+
+	/**
+	 * This is the relational version of {@link CActiveRecord::findAllBySql()}.
+	 */
+	public function findAllBySql($sql,$params=array())
+	{
+		Prado::trace(get_class($this->_joinTree->model).'.findAllBySql() eagerly','System.Db.ActiveRecord.TActiveRecord');
+		if(($rows=$this->_builder->createSqlCommand($sql,$params)->queryAll())!==array())
+		{
+			$baseRecords=$this->_joinTree->model->populateRecords($rows,false);
+			$this->_joinTree->findWithBase($baseRecords);
+			$this->_joinTree->afterFind();
+			return $baseRecords;
+		}
+		else
+			return array();
+	}
+
+	/**
+	 * This is the relational version of {@link CActiveRecord::count()}.
+	 * @since 1.0.3
+	 */
+	public function count($condition='',$params=array())
+	{
+		Prado::trace(get_class($this->_joinTree->model).'.count() eagerly','System.Db.ActiveRecord.TActiveRecord');
+		$criteria=$this->_builder->createCriteria($condition,$params);
+		if($this->_criteria!==null)
+		{
+			$this->_criteria->mergeWith($criteria);
+			$criteria=$this->_criteria;
+		}
+		return $this->_joinTree->count($criteria);
+	}
+
+	/**
+	 * Finds the related objects for the specified active record.
+	 * This method is internally invoked by {@link CActiveRecord} to support lazy loading.
+	 * @param CActiveRecord the base record whose related objects are to be loaded
+	 */
+	public function lazyFind($baseRecord)
+	{
+		$this->_joinTree->lazyFind($baseRecord);
+		if(!empty($this->_joinTree->children))
+		{
+			$child=reset($this->_joinTree->children);
+			$child->afterFind();
+		}
+	}
+
+	/**
+	 * Builds up the join tree representing the relationships involved in this query.
+	 * @param CJoinElement the parent tree node
+	 * @param mixed the names of the related objects relative to the parent tree node
+	 * @param array additional query options to be merged with the relation
+	 */
+	private function buildJoinTree($parent,$with,$options=null)
+	{
+		if($parent instanceof CStatElement)
+			throw new TDbException('The STAT relation "'.($parent->relation->name).'" cannot have child relations.');
+
+		if(is_string($with))
+		{
+			if(($pos=strrpos($with,'.'))!==false)
+			{
+				$parent=$this->buildJoinTree($parent,substr($with,0,$pos));
+				$with=substr($with,$pos+1);
+			}
+
+			// named scope
+			if(($pos=strpos($with,':'))!==false)
+			{
+				$scopes=explode(':',substr($with,$pos+1));
+				$with=substr($with,0,$pos);
+			}
+
+			if(isset($parent->children[$with]))
+				return $parent->children[$with];
+
+			if(($relation=$parent->model->getActiveRelation($with))===null)
+				throw new TDbException('Relation "'.$with.'" is not defined in active record class "'.get_class($parent->model).'".');
+
+			$relation=clone $relation;
+			$model=TActiveRecord::model($relation->className);
+			if(($scope=$model->defaultScope())!==array())
+				$relation->mergeWith($scope);
+			if(isset($scopes) && !empty($scopes))
+			{
+				$scs=$model->scopes();
+				foreach($scopes as $scope)
+				{
+					if(isset($scs[$scope]))
+						$relation->mergeWith($scs[$scope]);
+					else
+						throw new TDbException('Active record class "'.get_class($model).'" does not have a scope named "'.$scope.'".');
+				}
+			}
+
+			// dynamic options
+			if($options!==null)
+				$relation->mergeWith($options);
+
+			if($relation instanceof TStatRelation)
+				return new TStatElement($this,$relation,$parent);
+			else
+			{
+				$element=$parent->children[$with]=new TJoinElement($this,$relation,$parent,++$this->_joinCount);
+				if(!empty($relation->with))
+					$this->buildJoinTree($element,$relation->with);
+				return $element;
+			}
+		}
+
+		// $with is an array, keys are relation name, values are relation spec
+		foreach($with as $key=>$value)
+		{
+			if(is_string($value))  // the value is a relation name
+				$this->buildJoinTree($parent,$value);
+			else if(is_string($key) && is_array($value))
+				$element=$this->buildJoinTree($parent,$key,$value);
+		}
+	}
+}
+
+
+/**
+ * CJoinElement represents a tree node in the join tree created by {@link CActiveFinder}.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id: CActiveFinder.php 1127 2009-06-13 20:26:35Z qiang.xue $
+ * @package System.Db.ActiveRecord
+ * @since 1.0
+ */
+class TJoinElement
+{
+	/**
+	 * @var integer the unique ID of this tree node
+	 */
+	public $id;
+	/**
+	 * @var CActiveRelation the relation represented by this tree node
+	 */
+	public $relation;
+	/**
+	 * @var CActiveRecord the model associated with this tree node
+	 */
+	public $model;
+	/**
+	 * @var array list of active records found by the queries. They are indexed by primary key values.
+	 */
+	public $records=array();
+	/**
+	 * @var array list of child join elements
+	 */
+	public $children=array();
+	/**
+	 * @var array list of stat elements
+	 * @since 1.0.4
+	 */
+	public $stats=array();
+	/**
+	 * @var string table alias for this join element
+	 */
+	public $tableAlias;
+
+	private $_finder;
+	private $_builder;
+	private $_parent;
+	private $_pkAlias;  				// string or name=>alias
+	private $_columnAliases=array();	// name=>alias
+	private $_joined=false;
+	private $_table;
+	private $_related=array();			// PK, relation name, related PK => true
+
+	/**
+	 * Constructor.
+	 * @param CActiveFinder the finder
+	 * @param mixed the relation (if the third parameter is not null)
+	 * or the model (if the third parameter is null) associated with this tree node.
+	 * @param CJoinElement the parent tree node
+	 * @param integer the ID of this tree node that is unique among all the tree nodes
+	 */
+	public function __construct($finder,$relation,$parent=null,$id=0)
+	{
+		$this->_finder=$finder;
+		$this->id=$id;
+		if($parent!==null)
+		{
+			$this->relation=$relation;
+			$this->_parent=$parent;
+			$this->_builder=$parent->_builder;
+			$this->tableAlias=$relation->alias===null?$relation->name:$relation->alias;
+			$this->model=TActiveRecord::model($relation->className);
+			$this->_table=$this->model->getTableSchema();
+		}
+		else  // root element, the first parameter is the model.
+		{
+			$this->model=$relation;
+			$this->_builder=$relation->getCommandBuilder();
+			$this->_table=$relation->getTableSchema();
+		}
+
+		// set up column aliases, such as t1_c2
+		$table=$this->_table;
+		$prefix='t'.$id.'_c';
+		foreach($table->getColumnNames() as $key=>$name)
+		{
+			$alias=$prefix.$key;
+			$this->_columnAliases[$name]=$alias;
+			if($table->primaryKey===$name)
+				$this->_pkAlias=$alias;
+			else if(is_array($table->primaryKey) && in_array($name,$table->primaryKey))
+				$this->_pkAlias[$name]=$alias;
+		}
+	}
+
+	/**
+	 * Performs the recursive finding with the criteria.
+	 * @param CDbCriteria the query criteria
+	 */
+	public function find($criteria=null)
+	{
+		if($this->_parent===null) // root element
+		{
+			$query=new TJoinQuery($this,$criteria);
+			$this->_finder->baseLimited=($criteria->offset>=0 || $criteria->limit>=0);
+			$this->buildQuery($query);
+			$this->_finder->baseLimited=false;
+			$this->runQuery($query);
+		}
+		else if(!$this->_joined && !empty($this->_parent->records)) // not joined before
+		{
+			$query=new TJoinQuery($this->_parent);
+			$this->_joined=true;
+			$query->join($this);
+			$this->buildQuery($query);
+			$this->_parent->runQuery($query);
+		}
+
+		foreach($this->children as $child) // find recursively
+			$child->find();
+
+		foreach($this->stats as $stat)
+			$stat->query();
+	}
+
+	/**
+	 * Performs lazy find with the specified base record.
+	 * @param CActiveRecord the active record whose related object is to be fetched.
+	 */
+	public function lazyFind($baseRecord)
+	{
+		if(is_string($this->_table->primaryKey))
+			$this->records[$baseRecord->{$this->_table->primaryKey}]=$baseRecord;
+		else
+		{
+			$pk=array();
+			foreach($this->_table->primaryKey as $name)
+				$pk[$name]=$baseRecord->$name;
+			$this->records[serialize($pk)]=$baseRecord;
+		}
+
+		foreach($this->stats as $stat)
+			$stat->query();
+
+		if(empty($this->children))
+			return;
+
+		$child=reset($this->children);
+		$query=new TJoinQuery($this);
+		$this->_joined=true;
+		$child->_joined=true;
+		$query->join($child);
+		if($child->relation instanceof THasManyRelation)
+		{
+			$query->limit=$child->relation->limit;
+			$query->offset=$child->relation->offset;
+			$this->_finder->baseLimited=($query->offset>=0 || $query->limit>=0);
+			$query->groups[]=$child->relation->group;
+			$query->havings[]=$child->relation->having;
+		}
+		$child->buildQuery($query);
+		$this->_finder->baseLimited=false;
+		$this->runQuery($query);
+		foreach($child->children as $c)
+			$c->find();
+	}
+
+	/**
+	 * Performs the eager loading with the base records ready.
+	 * @param mixed the available base record(s).
+	 */
+	public function findWithBase($baseRecords)
+	{
+		if(!is_array($baseRecords))
+			$baseRecords=array($baseRecords);
+		if(is_string($this->_table->primaryKey))
+		{
+			foreach($baseRecords as $baseRecord)
+				$this->records[$baseRecord->{$this->_table->primaryKey}]=$baseRecord;
+		}
+		else
+		{
+			foreach($baseRecords as $baseRecord)
+			{
+				$pk=array();
+				foreach($this->_table->primaryKey as $name)
+					$pk[$name]=$baseRecord->$name;
+				$this->records[serialize($pk)]=$baseRecord;
+			}
+		}
+
+		$query=new TJoinQuery($this);
+		$this->buildQuery($query);
+		if(count($query->joins)>1)
+			$this->runQuery($query);
+		foreach($this->children as $child)
+			$child->find();
+
+		foreach($this->stats as $stat)
+			$stat->query();
+	}
+
+	/**
+	 * Count the number of primary records returned by the join statement.
+	 * @param CDbCriteria the query criteria
+	 * @return integer number of primary records.
+	 * @since 1.0.3
+	 */
+	public function count($criteria=null)
+	{
+		$query=new TJoinQuery($this,$criteria);
+		// ensure only one big join statement is used
+		$this->_finder->baseLimited=false;
+		$this->_finder->joinAll=true;
+		$this->buildQuery($query);
+
+		if(is_string($this->_table->primaryKey))
+		{
+			$prefix=$this->getColumnPrefix();
+			$schema=$this->_builder->getSchema();
+			$column=$prefix.$schema->quoteColumnName($this->_table->primaryKey);
+		}
+		else if($criteria->select!=='*')
+			$column=$criteria->select;
+		else
+			throw new TDbException('Unable to count records with composite primary keys. Please explicitly specify the SELECT option in the query criteria.');
+
+		$query->selects=array("COUNT(DISTINCT $column)");
+		$query->orders=$query->groups=$query->havings=array();
+		$command=$query->createCommand($this->_builder);
+		return $command->queryScalar();
+	}
+
+	/**
+	 * Calls {@link CActiveRecord::afterFind} of all the records.
+	 * @since 1.0.3
+	 */
+	public function afterFind()
+	{
+		foreach($this->records as $record)
+			$record->afterFindInternal();
+		foreach($this->children as $child)
+			$child->afterFind();
+	}
+
+	/**
+	 * Builds the join query with all descendant HAS_ONE and BELONGS_TO nodes.
+	 * @param CJoinQuery the query being built up
+	 */
+	public function buildQuery($query)
+	{
+		foreach($this->children as $child)
+		{
+			if($child->relation instanceof THasOneRelation || $child->relation instanceof TBelongsToRelation
+				|| $this->_finder->joinAll || !$this->_finder->baseLimited && $child->relation->together)
+			{
+				$child->_joined=true;
+				$query->join($child);
+				$child->buildQuery($query);
+			}
+		}
+	}
+
+	/**
+	 * Executes the join query and populates the query results.
+	 * @param CJoinQuery the query to be executed.
+	 */
+	public function runQuery($query)
+	{
+		$command=$query->createCommand($this->_builder);
+		foreach($command->queryAll() as $row)
+			$this->populateRecord($query,$row);
+	}
+
+	/**
+	 * Populates the active records with the query data.
+	 * @param CJoinQuery the query executed
+	 * @param array a row of data
+	 * @return CActiveRecord the populated record
+	 */
+	private function populateRecord($query,$row)
+	{
+		// determine the primary key value
+		if(is_string($this->_pkAlias))  // single key
+		{
+			if(isset($row[$this->_pkAlias]))
+				$pk=$row[$this->_pkAlias];
+			else	// no matching related objects
+				return null;
+		}
+		else // is_array, composite key
+		{
+			$pk=array();
+			foreach($this->_pkAlias as $name=>$alias)
+			{
+				if(isset($row[$alias]))
+					$pk[$name]=$row[$alias];
+				else	// no matching related objects
+					return null;
+			}
+			$pk=serialize($pk);
+		}
+
+		// retrieve or populate the record according to the primary key value
+		if(isset($this->records[$pk]))
+			$record=$this->records[$pk];
+		else
+		{
+			$attributes=array();
+			$aliases=array_flip($this->_columnAliases);
+			foreach($row as $alias=>$value)
+			{
+				if(isset($aliases[$alias]))
+					$attributes[$aliases[$alias]]=$value;
+			}
+			$record=$this->model->populateRecord($attributes,false);
+			foreach($this->children as $child)
+				$record->addRelatedRecord($child->relation->name,null,$child->relation instanceof THasManyRelation);
+			$this->records[$pk]=$record;
+		}
+
+		// populate child records recursively
+		foreach($this->children as $child)
+		{
+			if(!isset($query->elements[$child->id]))
+				continue;
+			$childRecord=$child->populateRecord($query,$row);
+			if($child->relation instanceof THasOneRelation || $child->relation instanceof TBelongsToRelation)
+				$record->addRelatedRecord($child->relation->name,$childRecord,false);
+			else // has_many and many_many
+			{
+				// need to double check to avoid adding duplicated related objects
+				if($childRecord instanceof TActiveRecord)
+					$fpk=serialize($childRecord->getPrimaryKey());
+				else
+					$fpk=0;
+				if(!isset($this->_related[$pk][$child->relation->name][$fpk]))
+				{
+					$record->addRelatedRecord($child->relation->name,$childRecord,true);
+					$this->_related[$pk][$child->relation->name][$fpk]=true;
+				}
+			}
+		}
+
+		return $record;
+	}
+
+	/**
+	 * @return string the table name and the table alias (if any). This can be used directly in SQL query without escaping.
+	 */
+	public function getTableNameWithAlias()
+	{
+		if($this->tableAlias!==null)
+			return $this->_table->rawName . ' ' . $this->tableAlias;
+		else
+			return $this->_table->rawName;
+	}
+
+	/**
+	 * Generates the list of columns to be selected.
+	 * Columns will be properly aliased and primary keys will be added to selection if they are not specified.
+	 * @param mixed columns to be selected. Defaults to '*', indicating all columns.
+	 * @return string the column selection
+	 */
+	public function getColumnSelect($select='*')
+	{
+		$schema=$this->_builder->getSchema();
+		$prefix=$this->getColumnPrefix();
+		$columns=array();
+		if($select==='*')
+		{
+			foreach($this->_table->getColumnNames() as $name)
+				$columns[]=$prefix.$schema->quoteColumnName($name).' AS '.$schema->quoteColumnName($this->_columnAliases[$name]);
+		}
+		else
+		{
+			if(is_string($select))
+				$select=explode(',',$select);
+			$selected=array();
+			foreach($select as $name)
+			{
+				$name=trim($name);
+				$matches=array();
+				if(($pos=strrpos($name,'.'))!==false)
+					$key=substr($name,$pos+1);
+				else
+					$key=$name;
+				if(isset($this->_columnAliases[$key]))  // simple column names
+				{
+					$columns[]=$prefix.$schema->quoteColumnName($key).' AS '.$schema->quoteColumnName($this->_columnAliases[$key]);
+					$selected[$this->_columnAliases[$key]]=1;
+				}
+				else if(preg_match('/^(.*?)\s+AS\s+(\w+)$/i',$name,$matches)) // if the column is already aliased
+				{
+					$alias=$matches[2];
+					if(!isset($this->_columnAliases[$alias]) || $this->_columnAliases[$alias]!==$alias)
+					{
+						$this->_columnAliases[$alias]=$alias;
+						$columns[]=$name;
+						$selected[$alias]=1;
+					}
+				}
+				else
+					throw new TDbException('Active record "'.get_class($this->model).'" is trying to select an invalid column "'.$name.'". Note, the column must exist in the table or be an expression with alias.');
+			}
+			// add primary key selection if they are not selected
+			if(is_string($this->_pkAlias) && !isset($selected[$this->_pkAlias]))
+				$columns[]=$prefix.$schema->quoteColumnName($this->_table->primaryKey).' AS '.$schema->quoteColumnName($this->_pkAlias);
+			else if(is_array($this->_pkAlias))
+			{
+				foreach($this->_table->primaryKey as $name)
+					if(!isset($selected[$name]))
+						$columns[]=$prefix.$schema->quoteColumnName($name).' AS '.$schema->quoteColumnName($this->_pkAlias[$name]);
+			}
+		}
+
+		return implode(', ',$columns);
+	}
+
+	/**
+	 * @return string the primary key selection
+	 */
+	public function getPrimaryKeySelect()
+	{
+		$schema=$this->_builder->getSchema();
+		$prefix=$this->getColumnPrefix();
+		$columns=array();
+		if(is_string($this->_pkAlias))
+			$columns[]=$prefix.$schema->quoteColumnName($this->_table->primaryKey).' AS '.$schema->quoteColumnName($this->_pkAlias);
+		else if(is_array($this->_pkAlias))
+		{
+			foreach($this->_pkAlias as $name=>$alias)
+				$columns[]=$prefix.$schema->quoteColumnName($name).' AS '.$schema->quoteColumnName($alias);
+		}
+		return implode(', ',$columns);
+	}
+
+	/**
+	 * @return string the condition that specifies only the rows with the selected primary key values.
+	 */
+	public function getPrimaryKeyRange()
+	{
+		if(empty($this->records))
+			return '';
+		$values=array_keys($this->records);
+		if(is_array($this->_table->primaryKey))
+		{
+			foreach($values as &$value)
+				$value=unserialize($value);
+		}
+		return $this->_builder->createInCondition($this->_table,$this->_table->primaryKey,$values,$this->getColumnPrefix());
+	}
+
+	/**
+	 * @return string the column prefix for column reference disambiguation
+	 */
+	public function getColumnPrefix()
+	{
+		if($this->tableAlias!==null)
+			return $this->tableAlias.'.';
+		else
+			return $this->_table->rawName.'.';
+	}
+
+	/**
+	 * @return string the join statement (this node joins with its parent)
+	 */
+	public function getJoinCondition()
+	{
+		$parent=$this->_parent;
+		$relation=$this->relation;
+		if($this->relation instanceof TManyManyRelation)
+		{
+			if(!preg_match('/^\s*(.*?)\((.*)\)\s*$/',$this->relation->foreignKey,$matches))
+				throw new TDbException('The relation "'.($this->relation->name).'" in active record class "'.get_class($parent->model).'" is specified with an invalid foreign key. The format of the foreign key must be "joinTable(fk1,fk2,...)".');
+
+			$schema=$this->_builder->getSchema();
+			if(($joinTable=$schema->getTable($matches[1]))===null)
+				throw new TDbException('The relation "'.($this->relation->name).'" in active record class "'.get_class($parent->model).'" is not specified correctly: the join table "'.($matches[1]).'" given in the foreign key cannot be found in the database.');
+				
+			$fks=preg_split('/[\s,]+/',$matches[2],-1,PREG_SPLIT_NO_EMPTY);
+
+			return $this->joinManyMany($joinTable,$fks,$parent);
+		}
+		else
+		{
+			$fks=preg_split('/[\s,]+/',$relation->foreignKey,-1,PREG_SPLIT_NO_EMPTY);
+			if($this->relation instanceof TBelongsToRelation)
+			{
+				$pke=$this;
+				$fke=$parent;
+			}
+			else
+			{
+				$pke=$parent;
+				$fke=$this;
+			}
+			return $this->joinOneMany($fke,$fks,$pke,$parent);
+		}
+	}
+
+	/**
+	 * Generates the join statement for one-many relationship.
+	 * This works for HAS_ONE, HAS_MANY and BELONGS_TO.
+	 * @param CJoinElement the join element containing foreign keys
+	 * @param array the foreign keys
+	 * @param CJoinElement the join element containg primary keys
+	 * @param CJoinElement the parent join element
+	 * @return string the join statement
+	 * @throws CDbException if a foreign key is invalid
+	 */
+	private function joinOneMany($fke,$fks,$pke,$parent)
+	{
+		$schema=$this->_builder->getSchema();
+		$joins=array();
+		foreach($fks as $i=>$fk)
+		{
+			if(!isset($fke->_table->columns[$fk]))
+				throw new TDbException('The relation "'.($this->relation->name).'" in active record class "'.get_class($parent->model).'" is specified with an invalid foreign key "'.$fk.'". There is no such column in the table "'.($fke->_table->name).'".');
+
+			if(isset($fke->_table->foreignKeys[$fk]))
+				$pk=$fke->_table->foreignKeys[$fk][1];
+			else  // FK constraints undefined
+			{
+				if(is_array($pke->_table->primaryKey)) // composite PK
+					$pk=$pke->_table->primaryKey[$i];
+				else
+					$pk=$pke->_table->primaryKey;
+			}
+			$joins[]=$fke->getColumnPrefix().$schema->quoteColumnName($fk) . '=' . $pke->getColumnPrefix().$schema->quoteColumnName($pk);
+		}
+		if(!empty($this->relation->on))
+			$joins[]=$this->relation->on;
+		return $this->relation->joinType . ' ' . $this->getTableNameWithAlias() . ' ON (' . implode(') AND (',$joins).')';
+	}
+
+	/**
+	 * Generates the join statement for many-many relationship.
+	 * @param CDbTableSchema the join table
+	 * @param array the foreign keys
+	 * @param CJoinElement the parent join element
+	 * @return string the join statement
+	 * @throws CDbException if a foreign key is invalid
+	 */
+	private function joinManyMany($joinTable,$fks,$parent)
+	{
+		$schema=$this->_builder->getSchema();
+		$joinAlias=$this->relation->name.'_'.$this->tableAlias;
+		$parentCondition=array();
+		$childCondition=array();
+		foreach($fks as $i=>$fk)
+		{
+			if(!isset($joinTable->columns[$fk]))
+				throw new TDbException('The relation "'.($this->relation->name).'" in active record class "'.get_class($parent->model).'" is specified with an invalid foreign key "'.$fk.'". There is no such column in the table "'.($joinTable->name).'".');
+
+			if(isset($joinTable->foreignKeys[$fk]))
+			{
+				list($tableName,$pk)=$joinTable->foreignKeys[$fk];
+				if(!isset($parentCondition[$pk]) && $schema->compareTableNames($parent->_table->rawName,$tableName))
+					$parentCondition[$pk]=$parent->getColumnPrefix().$schema->quoteColumnName($pk).'='.$joinAlias.'.'.$schema->quoteColumnName($fk);
+				else if(!isset($childCondition[$pk]) && $schema->compareTableNames($this->_table->rawName,$tableName))
+					$childCondition[$pk]=$this->getColumnPrefix().$schema->quoteColumnName($pk).'='.$joinAlias.'.'.$schema->quoteColumnName($fk);
+				else
+					throw new TDbException('The relation "'.($this->relation->name).'" in active record class "'.get_class($parent->model).'" is specified with an invalid foreign key "'.$fk.'". The foreign key does not point to either joining table.');
+			}
+			else // FK constraints not defined
+			{
+				if($i<count($parent->_table->primaryKey))
+				{
+					$pk=is_array($parent->_table->primaryKey) ? $parent->_table->primaryKey[$i] : $parent->_table->primaryKey;
+					$parentCondition[$pk]=$parent->getColumnPrefix().$schema->quoteColumnName($pk).'='.$joinAlias.'.'.$schema->quoteColumnName($fk);
+				}
+				else
+				{
+					$j=$i-count($parent->_table->primaryKey);
+					$pk=is_array($this->_table->primaryKey) ? $this->_table->primaryKey[$j] : $this->_table->primaryKey;
+					$childCondition[$pk]=$this->getColumnPrefix().$schema->quoteColumnName($pk).'='.$joinAlias.'.'.$schema->quoteColumnName($fk);
+				}
+			}
+		}
+		if($parentCondition!==array() && $childCondition!==array())
+		{
+			$join=$this->relation->joinType.' '.$joinTable->rawName.' '.$joinAlias;
+			$join.=' ON ('.implode(') AND (',$parentCondition).')';
+			$join.=' '.$this->relation->joinType.' '.$this->getTableNameWithAlias();
+			$join.=' ON ('.implode(') AND (',$childCondition).')';
+			if(!empty($this->relation->on))
+				$join.=' AND ('.$this->relation->on.')';
+			return $join;
+		}
+		else
+			throw new TDbException('The relation "'.($this->relation->name).'" in active record class "'.get_class($parent->model).'" is specified with an incomplete foreign key. The foreign key must consist of columns referencing both joining tables.');
+	}
+}
+
+
+/**
+ * CJoinQuery represents a JOIN SQL statement.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id: CActiveFinder.php 1127 2009-06-13 20:26:35Z qiang.xue $
+ * @package System.Db.ActiveRecord
+ * @since 1.0
+ */
+class TJoinQuery
+{
+	/**
+	 * @var array list of column selections
+	 */
+	public $selects=array();
+	/**
+	 * @var array list of join statement
+	 */
+	public $joins=array();
+	/**
+	 * @var array list of WHERE clauses
+	 */
+	public $conditions=array();
+	/**
+	 * @var array list of ORDER BY clauses
+	 */
+	public $orders=array();
+	/**
+	 * @var array list of GROUP BY clauses
+	 */
+	public $groups=array();
+	/**
+	 * @var array list of HAVING clauses
+	 */
+	public $havings=array();
+	/**
+	 * @var integer row limit
+	 */
+	public $limit=-1;
+	/**
+	 * @var integer row offset
+	 */
+	public $offset=-1;
+	/**
+	 * @var array list of query parameters
+	 */
+	public $params=array();
+	/**
+	 * @var array list of join element IDs (id=>true)
+	 */
+	public $elements=array();
+
+	/**
+	 * Constructor.
+	 * @param CJoinElement The root join tree.
+	 * @param CDbCriteria the query criteria
+	 */
+	public function __construct($joinElement,$criteria=null)
+	{
+		if($criteria!==null)
+		{
+			$this->selects[]=$joinElement->getColumnSelect($criteria->select);
+			$this->joins[]=$joinElement->getTableNameWithAlias();
+			$this->joins[]=$criteria->join;
+			$this->conditions[]=$criteria->condition;
+			$this->orders[]=$criteria->order;
+			$this->groups[]=$criteria->group;
+			$this->havings[]=$criteria->having;
+			$this->limit=$criteria->limit;
+			$this->offset=$criteria->offset;
+			$this->params=$criteria->params;
+		}
+		else
+		{
+			$this->selects[]=$joinElement->getPrimaryKeySelect();
+			$this->joins[]=$joinElement->getTableNameWithAlias();
+			$this->conditions[]=$joinElement->getPrimaryKeyRange();
+		}
+		$this->elements[$joinElement->id]=true;
+	}
+
+	/**
+	 * Joins with another join element
+	 * @param CJoinElement the element to be joined
+	 */
+	public function join($element)
+	{
+		$this->selects[]=$element->getColumnSelect($element->relation->select);
+		$this->conditions[]=$element->relation->condition;
+		$this->orders[]=$element->relation->order;
+		$this->joins[]=$element->getJoinCondition();
+		$this->groups[]=$element->relation->group;
+		$this->havings[]=$element->relation->having;
+
+		if(is_array($element->relation->params))
+		{
+			if(is_array($this->params))
+				$this->params=array_merge($this->params,$element->relation->params);
+			else
+				$this->params=$element->relation->params;
+		}
+		$this->elements[$element->id]=true;
+	}
+
+	/**
+	 * Creates the SQL statement.
+	 * @param CDbCommandBuilder the command builder
+	 * @return string the SQL statement
+	 */
+	public function createCommand($builder)
+	{
+		$sql='SELECT ' . implode(', ',$this->selects);
+		$sql.=' FROM ' . implode(' ',$this->joins);
+
+		$conditions=array();
+		foreach($this->conditions as $condition)
+			if($condition!=='')
+				$conditions[]=$condition;
+		if($conditions!==array())
+			$sql.=' WHERE (' . implode(') AND (',$conditions).')';
+
+		$groups=array();
+		foreach($this->groups as $group)
+			if($group!=='')
+				$groups[]=$group;
+		if($groups!==array())
+			$sql.=' GROUP BY ' . implode(', ',$groups);
+
+		$havings=array();
+		foreach($this->havings as $having)
+			if($having!=='')
+				$havings[]=$having;
+		if($havings!==array())
+			$sql.=' HAVING (' . implode(') AND (',$havings).')';
+
+		$orders=array();
+		foreach($this->orders as $order)
+			if($order!=='')
+				$orders[]=$order;
+		if($orders!==array())
+			$sql.=' ORDER BY ' . implode(', ',$orders);
+
+		$sql=$builder->applyLimit($sql,$this->limit,$this->offset);
+		$command=$builder->getDbConnection()->createCommand($sql);
+		$builder->bindValues($command,$this->params);
+		return $command;
+	}
+}
+
+
+/**
+ * CStatElement represents STAT join element for {@link CActiveFinder}.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id: CActiveFinder.php 1127 2009-06-13 20:26:35Z qiang.xue $
+ * @package System.Db.ActiveRecord
+ * @since 1.0.4
+ */
+class TStatElement
+{
+	/**
+	 * @var CActiveRelation the relation represented by this tree node
+	 */
+	public $relation;
+
+	private $_finder;
+	private $_parent;
+
+	/**
+	 * Constructor.
+	 * @param CActiveFinder the finder
+	 * @param CStatRelation the STAT relation
+	 * @param CJoinElement the join element owning this STAT element
+	 */
+	public function __construct($finder,$relation,$parent)
+	{
+		$this->_finder=$finder;
+		$this->_parent=$parent;
+		$this->relation=$relation;
+		$parent->stats[]=$this;
+	}
+
+	/**
+	 * Performs the STAT query.
+	 */
+	public function query()
+	{
+		if(preg_match('/^\s*(.*?)\((.*)\)\s*$/',$this->relation->foreignKey,$matches))
+			$this->queryManyMany($matches[1],$matches[2]);
+		else
+			$this->queryOneMany();
+	}
+
+	private function queryOneMany()
+	{
+		$relation=$this->relation;
+		$model=TActiveRecord::model($relation->className);
+		$builder=$model->getCommandBuilder();
+		$schema=$builder->getSchema();
+		$table=$model->getTableSchema();
+		$pkTable=$this->_parent->model->getTableSchema();
+
+		$fks=preg_split('/[\s,]+/',$relation->foreignKey,-1,PREG_SPLIT_NO_EMPTY);
+		if(count($fks)!==count($pkTable->primaryKey))
+			throw new TDbException('The relation "'.($relation->name).'" in active record class "'.get_class($parent->model).'" is specified with an invalid foreign key. The columns in the key must match the primary keys of the table "'.($pkTable->name).'".');
+
+		// set up mapping between fk and pk columns
+		$map=array();  // pk=>fk
+		foreach($fks as $i=>$fk)
+		{
+			if(!isset($table->columns[$fk]))
+				throw new TDbException('The relation "'.($relation->name).'" in active record class "'.get_class($parent->model).'" is specified with an invalid foreign key "'.$fk.'". There is no such column in the table "'.($table->name).'".');
+
+			if(isset($table->foreignKeys[$fk]))
+			{
+				list($tableName,$pk)=$table->foreignKeys[$fk];
+				if($schema->compareTableNames($pkTable->rawName,$tableName))
+					$map[$pk]=$fk;
+				else
+					throw new TDbException('The relation "'.($relation->name).'" in active record class "'.get_class($parent->model).'" is specified with a foreign key "'.$fk.'" that does not point to the parent table "'.($pkTable->name).'".');
+			}
+			else  // FK constraints undefined
+			{
+				if(is_array($table->primaryKey)) // composite PK
+					$map[$table->primaryKey[$i]]=$fk;
+			}
+		}
+
+		$records=$this->_parent->records;
+
+		$where=empty($relation->condition)?'' : ' WHERE ('.$relation->condition.')';
+		$group=empty($relation->group)?'' : ', '.$relation->group;
+		$having=empty($relation->having)?'' : ' AND ('.$relation->having.')';
+		$order=empty($relation->order)?'' : ' ORDER BY '.$relation->order;
+
+		$c=$schema->quoteColumnName('c');
+		$s=$schema->quoteColumnName('s');
+
+		// generate and perform query
+		if(count($fks)===1)  // single column FK
+		{
+			$col=$table->columns[$fks[0]]->rawName;
+			$sql="SELECT $col AS $c, {$relation->select} AS $s FROM {$table->rawName}"
+				.$where
+				." GROUP BY $col".$group
+				." HAVING ".$builder->createInCondition($table,$fks[0],array_keys($records))
+				.$having.$order;
+			$command=$builder->getDbConnection()->createCommand($sql);
+			if(is_array($relation->params))
+				$builder->bindValues($command,$relation->params);
+			$stats=array();
+			foreach($command->queryAll() as $row)
+				$stats[$row['c']]=$row['s'];
+		}
+		else  // composite FK
+		{
+			$keys=array_keys($records);
+			foreach($keys as &$key)
+			{
+				$key2=unserialize($key);
+				$key=array();
+				foreach($pkTable->primaryKey as $pk)
+					$key[$map[$pk]]=$key2[$pk];
+			}
+			$cols=array();
+			foreach($pkTable->primaryKey as $n=>$pk)
+			{
+				$name=$table->columns[$map[$pk]]->rawName;
+				$cols[$name]=$name.' AS '.$schema->quoteColumnName('c'.$n);
+			}
+			$sql='SELECT '.implode(', ',$cols).", {$relation->select} AS $s FROM {$table->rawName}"
+				.$where
+				.' GROUP BY '.implode(', ',array_keys($cols)).$group
+				.' HAVING '.$builder->createInCondition($table,$fks,$keys)
+				.$having.$order;
+			$command=$builder->getDbConnection()->createCommand($sql);
+			if(is_array($relation->params))
+				$builder->bindValues($command,$relation->params);
+			$stats=array();
+			foreach($command->queryAll() as $row)
+			{
+				$key=array();
+				foreach($pkTable->primaryKey as $n=>$pk)
+					$key[$pk]=$row['c'.$n];
+				$stats[serialize($key)]=$row['s'];
+			}
+		}
+
+		// populate the results into existing records
+		foreach($records as $pk=>$record)
+			$record->addRelatedRecord($relation->name,isset($stats[$pk])?$stats[$pk]:$relation->defaultValue,false);
+	}
+
+	private function queryManyMany($joinTableName,$keys)
+	{
+		$relation=$this->relation;
+		$model=TActiveRecord::model($relation->className);
+		$table=$model->getTableSchema();
+		$builder=$model->getCommandBuilder();
+		$schema=$builder->getSchema();
+		$pkTable=$this->_parent->model->getTableSchema();
+
+		if(($joinTable=$builder->getSchema()->getTable($joinTableName))===null)
+			throw new TDbException('The relation "'.($relation->name).'" in active record class "'.get_class($this->_parent->model).'" is not specified correctly. The join table "'.$joinTableName.'" given in the foreign key cannot be found in the database.');
+
+		$fks=preg_split('/[\s,]+/',$keys,-1,PREG_SPLIT_NO_EMPTY);
+		if(count($fks)!==count($table->primaryKey)+count($pkTable->primaryKey))
+			throw new TDbException('The relation "'.($relation->name).'" in active record class "'.get_class($this->_parent->model).'" is specified with an incomplete foreign key. The foreign key must consist of columns referencing both joining tables.');
+
+		$joinCondition=array();
+		$map=array();
+		foreach($fks as $i=>$fk)
+		{
+			if(!isset($joinTable->columns[$fk]))
+				throw new TDbException('The relation "'.($relation->name).'" in active record class "'.get_class($this->_parent->model).'" is specified with an invalid foreign key "'.$fk.'". There is no such column in the table "'.($joinTable->name).'".');
+
+			if(isset($joinTable->foreignKeys[$fk]))
+			{
+				list($tableName,$pk)=$joinTable->foreignKeys[$fk];
+				if(!isset($joinCondition[$pk]) && $schema->compareTableNames($table->rawName,$tableName))
+					$joinCondition[$pk]=$table->rawName.'.'.$schema->quoteColumnName($pk).'='.$joinTable->rawName.'.'.$schema->quoteColumnName($fk);
+				else if(!isset($map[$pk]) && $schema->compareTableNames($pkTable->rawName,$tableName))
+					$map[$pk]=$fk;
+				else
+					throw new TDbException('The relation "'.($relation->name).'" in active record class "'.get_class($this->_parent->model).'" is specified with an invalid foreign key "'.$fk.'". The foreign key does not point to either joining table.');
+			}
+			else // FK constraints not defined
+			{
+				if($i<count($pkTable->primaryKey))
+				{
+					$pk=is_array($pkTable->primaryKey) ? $pkTable->primaryKey[$i] : $pkTable->primaryKey;
+					$map[$pk]=$fk;
+				}
+				else
+				{
+					$j=$i-count($pkTable->primaryKey);
+					$pk=is_array($table->primaryKey) ? $table->primaryKey[$j] : $table->primaryKey;
+					$joinCondition[$pk]=$table->rawName.'.'.$schema->quoteColumnName($pk).'='.$joinTable->rawName.'.'.$schema->quoteColumnName($fk);
+				}
+			}
+		}
+
+		if($joinCondition===array() || $map===array())
+			throw new TDbException('The relation "'.($relation->name).'" in active record class "'.get_class($this->_parent->model).'" is specified with an incomplete foreign key. The foreign key must consist of columns referencing both joining tables.');
+
+		$records=$this->_parent->records;
+
+		$cols=array();
+		foreach(is_string($pkTable->primaryKey)?array($pkTable->primaryKey):$pkTable->primaryKey as $n=>$pk)
+		{
+			$name=$joinTable->rawName.'.'.$schema->quoteColumnName($map[$pk]);
+			$cols[$name]=$name.' AS '.$schema->quoteColumnName('c'.$n);
+		}
+
+		$keys=array_keys($records);
+		if(is_array($pkTable->primaryKey))
+		{
+			foreach($keys as &$key)
+			{
+				$key2=unserialize($key);
+				$key=array();
+				foreach($pkTable->primaryKey as $pk)
+					$key[$map[$pk]]=$key2[$pk];
+			}
+		}
+
+		$where=empty($relation->condition)?'' : ' WHERE ('.$relation->condition.')';
+		$group=empty($relation->group)?'' : ', '.$relation->group;
+		$having=empty($relation->having)?'' : ' AND ('.$relation->having.')';
+		$order=empty($relation->order)?'' : ' ORDER BY '.$relation->order;
+
+		$sql='SELECT '.$this->relation->select.' AS '.$schema->quoteColumnName('s').', '.implode(', ',$cols)
+			.' FROM '.$table->rawName.' INNER JOIN '.$joinTable->rawName
+			.' ON ('.implode(') AND (',$joinCondition).')'
+			.$where
+			.' GROUP BY '.implode(', ',array_keys($cols)).$group
+			.' HAVING ('.$builder->createInCondition($joinTable,$map,$keys).')'
+			.$having.$order;
+
+		$command=$builder->getDbConnection()->createCommand($sql);
+		if(is_array($relation->params))
+			$builder->bindValues($command,$relation->params);
+
+		$stats=array();
+		foreach($command->queryAll() as $row)
+		{
+			if(is_array($pkTable->primaryKey))
+			{
+				$key=array();
+				foreach($pkTable->primaryKey as $n=>$k)
+					$key[$k]=$row['c'.$n];
+				$stats[serialize($key)]=$row['s'];
+			}
+			else
+				$stats[$row['c0']]=$row['s'];
+		}
+
+		foreach($records as $pk=>$record)
+			$record->addRelatedRecord($relation->name,isset($stats[$pk])?$stats[$pk]:$this->relation->defaultValue,false);
+	}
+}
diff --git a/framework/Db/ActiveRecord/TActiveRecord.php b/framework/Db/ActiveRecord/TActiveRecord.php
new file mode 100644
index 00000000..c0ffc32e
--- /dev/null
+++ b/framework/Db/ActiveRecord/TActiveRecord.php
@@ -0,0 +1,1843 @@
+<?php
+/**
+ * CActiveRecord class file.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright &copy; 2008-2009 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+/**
+ * CActiveRecord is the base class for classes representing relational data.
+ *
+ * It implements the active record design pattern, a popular Object-Relational Mapping (ORM) technique.
+ * Please check {@link http://www.yiiframework.com/doc/guide/database.ar the Guide} for more details
+ * about this class.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id: CActiveRecord.php 1127 2009-06-13 20:26:35Z qiang.xue $
+ * @package System.Db.ActiveRecord
+ * @since 1.0
+ */
+
+Prado::using('System.Base.TModel');
+Prado::using('System.Db.*');
+Prado::using('System.Db.ActiveRecord.*');
+Prado::using('System.Base.TEvent');
+Prado::using('System.Db.ActiveRecord.TActiveRecordCriteria');
+
+abstract class TActiveRecord extends TModel
+{
+	const BELONGS_TO='TBelongsToRelation';
+	const HAS_ONE='THasOneRelation';
+	const HAS_MANY='THasManyRelation';
+	const MANY_MANY='TManyManyRelation';
+	const STAT='TStatRelation';
+
+	/**
+	 * @var CDbConnection the default database connection for all active record classes.
+	 * By default, this is the 'db' application component.
+	 * @see getDbConnection
+	 */
+	public static $db;
+
+	private static $_models=array();			// class name => model
+
+	private $_md;								// meta data
+	private $_new=false;						// whether this instance is new or not
+	private $_attributes=array();				// attribute name => attribute value
+	private $_related=array();					// attribute name => related objects
+	private $_c;								// query criteria (used by finder only)
+
+	/**
+	 * Returns the instance of a active record finder for a particular class.
+	 * The finder objects are static instances for each ActiveRecord class.
+	 * This means that event handlers bound to these finder instances are class wide.
+	 * Create a new instance of the ActiveRecord class if you wish to bound the
+	 * event handlers to object instance.
+	 * @param string active record class name.
+	 * @return TActiveRecord active record finder instance.
+	 */
+ 
+	/**
+	 * Constructor.
+	 * @param string scenario name. See {@link CModel::scenario} for more details about this parameter.
+	 */
+	public function __construct($scenario='insert')
+	{
+		if($scenario===null) // internally used by populateRecord() and model()
+			return;
+
+		$this->setScenario($scenario);
+		$this->setIsNewRecord(true);
+		$this->_attributes=$this->getMetaData()->attributeDefaults;
+
+		$this->attachBehaviors($this->behaviors());
+		$this->afterConstruct();
+	}
+
+	/**
+	 * PHP sleep magic method.
+	 * This method ensures that the model meta data reference is set to null.
+	 */
+	public function __sleep()
+	{
+		$this->_md=null;
+		return array_keys((array)$this);
+	}
+
+	/**
+	 * PHP getter magic method.
+	 * This method is overridden so that AR attributes can be accessed like properties.
+	 * @param string property name
+	 * @return mixed property value
+	 * @see getAttribute
+	 */
+	public function __get($name)
+	{
+		if(isset($this->_attributes[$name]))
+			return $this->_attributes[$name];
+		else if(isset($this->getMetaData()->columns[$name]))
+			return null;
+		else if(isset($this->_related[$name]))
+			return $this->_related[$name];
+		else if(isset($this->getMetaData()->relations[$name]))
+			return $this->getRelated($name);
+		else
+			return parent::__get($name);
+	}
+
+	/**
+	 * PHP setter magic method.
+	 * This method is overridden so that AR attributes can be accessed like properties.
+	 * @param string property name
+	 * @param mixed property value
+	 */
+	public function __set($name,$value)
+	{
+		if($this->setAttribute($name,$value)===false)
+			parent::__set($name,$value);
+	}
+
+	/**
+	 * Checks if a property value is null.
+	 * This method overrides the parent implementation by checking
+	 * if the named attribute is null or not.
+	 * @param string the property name or the event name
+	 * @return boolean whether the property value is null
+	 * @since 1.0.1
+	 */
+	public function __isset($name)
+	{
+		if(isset($this->_attributes[$name]))
+			return true;
+		else if(isset($this->getMetaData()->columns[$name]))
+			return false;
+		else if(isset($this->_related[$name]))
+			return true;
+		else if(isset($this->getMetaData()->relations[$name]))
+			return $this->getRelated($name)!==null;
+#		else
+#			return parent::__isset($name);
+	}
+
+	/**
+	 * Sets a component property to be null.
+	 * This method overrides the parent implementation by clearing
+	 * the specified attribute value.
+	 * @param string the property name or the event name
+	 * @since 1.0.1
+	 */
+	public function __unset($name)
+	{
+		if(isset($this->getMetaData()->columns[$name]))
+			unset($this->_attributes[$name]);
+		else if(isset($this->getMetaData()->relations[$name]))
+			unset($this->_related[$name]);
+		else
+			parent::__unset($name);
+	}
+
+	/**
+	 * Calls the named method which is not a class method.
+	 * Do not call this method. This is a PHP magic method that we override
+	 * to implement the named scope feature.
+	 * @param string the method name
+	 * @param array method parameters
+	 * @return mixed the method return value
+	 * @since 1.0.5
+	 * 
+	 * @TODO: implement __call to parent
+	 * 
+	 */
+	public function __call($name,$parameters)
+	{
+		if(isset($this->getMetaData()->relations[$name]))
+		{
+			if(empty($parameters))
+				return $this->getRelated($name,false);
+			else
+				return $this->getRelated($name,false,$parameters[0]);
+		}
+
+		$scopes=$this->scopes();
+		if(isset($scopes[$name]))
+		{
+			$this->getDbCriteria()->mergeWith($scopes[$name]);
+			return $this;
+		}
+
+# 		return parent::__call($name,$parameters);*/
+	}
+
+	/**
+	 * Returns the related record(s).
+	 * This method will return the related record(s) of the current record.
+	 * If the relation is HAS_ONE or BELONGS_TO, it will return a single object
+	 * or null if the object does not exist.
+	 * If the relation is HAS_MANY or MANY_MANY, it will return an array of objects
+	 * or an empty array.
+	 * @param string the relation name (see {@link relations})
+	 * @param boolean whether to reload the related objects from database. Defaults to false.
+	 * @param array additional parameters that customize the query conditions as specified in the relation declaration.
+	 * This parameter has been available since version 1.0.5.
+	 * @return mixed the related object(s).
+	 * @throws CDbException if the relation is not specified in {@link relations}.
+	 * @since 1.0.2
+	 */
+	public function getRelated($name,$refresh=false,$params=array())
+	{
+		if(!$refresh && $params===array() && (isset($this->_related[$name]) || array_key_exists($name,$this->_related)))
+			return $this->_related[$name];
+
+		$md=$this->getMetaData();
+		if(!isset($md->relations[$name]))
+			throw new TDbException(get_class($this).' does not have relation "'.$name.'".');
+
+		Prado::trace('lazy loading '.get_class($this).'.'.$name,'System.Db.ActiveRecord.TActiveRecord');
+		$relation=$md->relations[$name];
+		if($this->getIsNewRecord() && ($relation instanceof THasOneRelation || $relation instanceof THasManyRelation))
+			return $relation instanceof THasOneRelation ? null : array();
+
+		if($params!==array()) // dynamic query
+		{
+			$exists=isset($this->_related[$name]) || array_key_exists($name,$this->_related);
+			if($exists)
+				$save=$this->_related[$name];
+			unset($this->_related[$name]);
+			$r=array($name=>$params);
+		}
+		else
+			$r=$name;
+
+		$finder=new TActiveFinder($this,$r);
+		$finder->lazyFind($this);
+
+		if(!isset($this->_related[$name]))
+		{
+			if($relation instanceof THasManyRelation)
+				$this->_related[$name]=array();
+			else if($relation instanceof TStatRelation)
+				$this->_related[$name]=$relation->defaultValue;
+			else
+				$this->_related[$name]=null;
+		}
+
+		if($params!==array())
+		{
+			$results=$this->_related[$name];
+			if($exists)
+				$this->_related[$name]=$save;
+			else
+				unset($this->_related[$name]);
+			return $results;
+		}
+		else
+			return $this->_related[$name];
+	}
+
+	/**
+	 * Returns a value indicating whether the named related object(s) has been loaded.
+	 * @param string the relation name
+	 * @return booolean a value indicating whether the named related object(s) has been loaded.
+	 * @since 1.0.3
+	 */
+	public function hasRelated($name)
+	{
+		return isset($this->_related[$name]) || array_key_exists($name,$this->_related);
+	}
+
+	/**
+	 * Returns the query criteria associated with this model.
+	 * @param boolean whether to create a criteria instance if it does not exist. Defaults to true.
+	 * @return CDbCriteria the query criteria that is associated with this model.
+	 * This criteria is mainly used by {@link scopes named scope} feature to accumulate
+	 * different criteria specifications.
+	 * @since 1.0.5
+	 */
+	public function getDbCriteria($createIfNull=true)
+	{
+		if($this->_c===null)
+		{
+			if(($c=$this->defaultScope())!==array() || $createIfNull)
+				$this->_c=new TDbCriteria($c);
+		}
+		return $this->_c;
+	}
+
+	/**
+	 * Returns the default named scope that should be applied to all queries implicitly for this model.
+	 * The default implementation simply returns an empty array. You may override this method
+	 * if the model needs to be queried with some default criteria (e.g. only active records should be returned).
+	 * @return array the query criteria. This will be used as the parameter to the constructor
+	 * of {@link CDbCriteria}.
+	 * @since 1.0.5
+	 */
+	public function defaultScope()
+	{
+		return array();
+	}
+
+	/**
+	 * Returns the static model of the specified AR class.
+	 * The model returned is a static instance of the AR class.
+	 * It is provided for invoking class-level methods (something similar to static class methods.)
+	 *
+	 * EVERY derived AR class must override this method as follows,
+	 * <pre>
+	 * public static function model($className=__CLASS__)
+	 * {
+	 *     return parent::model($className);
+	 * }
+	 * </pre>
+	 *
+	 * @param string active record class name.
+	 * @return CActiveRecord active record model instance.
+	 */
+	public static function model($className=__CLASS__)
+	{
+		if(isset(self::$_models[$className]))
+			return self::$_models[$className];
+		else
+		{
+			$model=self::$_models[$className]=new $className(null);
+			$model->attachBehaviors($model->behaviors());
+			$model->_md=new TActiveRecordMetaData($model);
+			return $model;
+		}
+	}
+
+	/**
+	 * @return CActiveRecordMetaData the meta for this AR class.
+	 */
+	public function getMetaData()
+	{
+		if($this->_md!==null)
+			return $this->_md;
+		else
+			return $this->_md=self::model(get_class($this))->_md;
+	}
+
+	/**
+	 * Returns the name of the associated database table.
+	 * By default this method returns the class name as the table name.
+	 * You may override this method if the table is not named after this convention.
+	 * @return string the table name
+	 */
+	public function tableName()
+	{
+		return get_class($this);
+	}
+
+	/**
+	 * Returns the primary key of the associated database table.
+	 * This method is meant to be overridden in case when the table is not defined with a primary key
+	 * (for some legency database). If the table is already defined with a primary key,
+	 * you do not need to override this method. The default implementation simply returns null,
+	 * meaning using the primary key defined in the database.
+	 * @return mixed the primary key of the associated database table.
+	 * If the key is a single column, it should return the column name;
+	 * If the key is a composite one consisting of several columns, it should
+	 * return the array of the key column names.
+	 * @since 1.0.4
+	 */
+	public function primaryKey()
+	{
+	}
+
+	/**
+	 * This method should be overridden to declare related objects.
+	 *
+	 * There are four types of relations that may exist between two active record objects:
+	 * <ul>
+	 * <li>BELONGS_TO: e.g. a member belongs to a team;</li>
+	 * <li>HAS_ONE: e.g. a member has at most one profile;</li>
+	 * <li>HAS_MANY: e.g. a team has many members;</li>
+	 * <li>MANY_MANY: e.g. a member has many skills and a skill belongs to a member.</li>
+	 * </ul>
+	 *
+	 * By declaring these relations, CActiveRecord can bring back related objects
+	 * in either lazy loading or eager loading approach, and you save the effort of
+	 * writing complex JOIN SQL statements.
+	 *
+	 * Each kind of related objects is defined in this method as an array with the following elements:
+	 * <pre>
+	 * 'varName'=>array('relationType', 'className', 'foreignKey', ...additional options)
+	 * </pre>
+	 * where 'varName' refers to the name of the variable/property that the related object(s) can
+	 * be accessed through; 'relationType' refers to the type of the relation, which can be one of the
+	 * following four constants: self::BELONGS_TO, self::HAS_ONE, self::HAS_MANY and self::MANY_MANY;
+	 * 'className' refers to the name of the active record class that the related object(s) is of;
+	 * and 'foreignKey' states the foreign key that relates the two kinds of active record.
+	 * Note, for composite foreign keys, they must be listed together, separating with space or comma;
+	 * and for foreign keys used in MANY_MANY relation, the joining table must be declared as well
+	 * (e.g. 'joinTable(fk1, fk2)').
+	 *
+	 * Additional options may be specified as name-value pairs in the rest array elements:
+	 * <ul>
+	 * <li>'select': string|array, a list of columns to be selected. Defaults to '*', meaning all columns.
+	 *   Column names should be disambiguated if they appear in an expression (e.g. COUNT(??.name) AS name_count).</li>
+	 * <li>'condition': string, the WHERE clause. Defaults to empty. Note, column references need to
+	 *   be disambiguated with prefix '??.' (e.g. ??.age&gt;20)</li>
+	 * <li>'order': string, the ORDER BY clause. Defaults to empty. Note, column references need to
+	 *   be disambiguated with prefix '??.' (e.g. ??.age DESC)</li>
+	 * <li>'with': string|array, a list of child related objects that should be loaded together with this object.
+	 *   Note, this is only honored by lazy loading, not eager loading.</li>
+	 * <li>'joinType': type of join. Defaults to 'LEFT OUTER JOIN'.</li>
+	 * <li>'alias': the alias for the table associated with this relationship.
+	 *   This option has been available since version 1.0.1. It defaults to null,
+	 *   meaning the table alias is the same as the relation name.</li>
+     * <li>'params': the parameters to be bound to the generated SQL statement.
+	 *   This should be given as an array of name-value pairs. This option has been
+	 *   available since version 1.0.3.</li>
+	 * <li>'on': the ON clause. The condition specified here will be appended
+	 *   to the joining condition using the AND operator. This option has been
+	 *   available since version 1.0.2.</li>
+	 * </ul>
+	 *
+	 * The following options are available for certain relations when lazy loading:
+	 * <ul>
+	 * <li>'group': string, the GROUP BY clause. Defaults to empty. Note, column references need to
+	 *   be disambiguated with prefix '??.' (e.g. ??.age). This option only applies to HAS_MANY and MANY_MANY relations.</li>
+	 * <li>'having': string, the HAVING clause. Defaults to empty. Note, column references need to
+	 *   be disambiguated with prefix '??.' (e.g. ??.age). This option only applies to HAS_MANY and MANY_MANY relations.</li>
+	 * <li>'limit': limit of the rows to be selected. This option does not apply to BELONGS_TO relation.</li>
+	 * <li>'offset': offset of the rows to be selected. This option does not apply to BELONGS_TO relation.</li>
+	 * </ul>
+	 *
+	 * Below is an example declaring related objects for 'Post' active record class:
+	 * <pre>
+	 * return array(
+	 *     'author'=>array(self::BELONGS_TO, 'User', 'authorID'),
+	 *     'comments'=>array(self::HAS_MANY, 'Comment', 'postID', 'with'=>'author', 'order'=>'createTime DESC'),
+	 *     'tags'=>array(self::MANY_MANY, 'Tag', 'PostTag(postID, tagID)', 'order'=>'name'),
+	 * );
+	 * </pre>
+	 *
+	 * @return array list of related object declarations. Defaults to empty array.
+	 */
+	public function relations()
+	{
+		return array();
+	}
+	
+	/**
+	 * Returns the declaration of named scopes.
+	 * A named scope represents a query criteria that can be chained together with
+	 * other named scopes and applied to a query. This method should be overridden
+	 * by child classes to declare named scopes for the particular AR classes.
+	 * For example, the following code declares two named scopes: 'recently' and
+	 * 'published'.
+	 * <pre>
+	 * return array(
+	 *     'published'=>array(
+	 *           'condition'=>'status=1',
+	 *     ),
+	 *     'recently'=>array(
+	 *           'order'=>'createTime DESC',
+	 *           'limit'=>5,
+	 *     ),
+	 * );
+	 * </pre>
+	 * If the above scopes are declared in a 'Post' model, we can perform the following
+	 * queries:
+	 * <pre>
+	 * $posts=Post::model()->published()->findAll();
+	 * $posts=Post::model()->published()->recently()->findAll();
+	 * $posts=Post::model()->published()->with('comments')->findAll();
+	 * </pre>
+	 * Note that the last query is a relational query.
+	 *
+	 * @return array the scope definition. The array keys are scope names; the array
+	 * values are the corresponding scope definitions. Each scope definition is represented
+	 * as an array whose keys must be properties of {@link CDbCriteria}.
+	 * @since 1.0.5
+	 */
+	public function scopes()
+	{
+		return array();
+	}
+
+	/**
+	 * Returns the list of all attribute names of the model.
+	 * This would return all column names of the table associated with this AR class.
+	 * @return array list of attribute names.
+	 * @since 1.0.1
+	 */
+	public function attributeNames()
+	{
+		return array_keys($this->getMetaData()->columns);
+	}
+
+	/**
+	 * Returns the database connection used by active record.
+	 * By default, the "db" application component is used as the database connection.
+	 * You may override this method if you want to use a different database connection.
+	 * @return CDbConnection the database connection used by active record.
+	 * 
+	 * @TODO Get default db connection if theres none set
+	 * 
+	 */
+	public function getDbConnection()
+	{
+		if(self::$db!==null)
+			return self::$db;
+		else
+		{
+			self::$db=Prado::getApplication()->getModule($this->getConnectionId())->getDbConnection();
+			if(self::$db instanceof TDbConnection)
+			{
+				self::$db->setActive(true);
+				return self::$db;
+			}
+			else
+				throw new TDbException('ActiveRecord requires a db connection.');
+		}
+	}
+
+	/**
+	 * Returns connection id (must be overloaded by child classes)
+	 * @return string Id of TDbConnection module
+	 */
+	abstract public function getConnectionId();
+
+	/**
+	 * @param string the relation name
+	 * @return CActiveRelation the named relation declared for this AR class. Null if the relation does not exist.
+	 */
+	public function getActiveRelation($name)
+	{
+		return isset($this->getMetaData()->relations[$name]) ? $this->getMetaData()->relations[$name] : null;
+	}
+
+	/**
+	 * @return CDbTableSchema the metadata of the table that this AR belongs to
+	 */
+	public function getTableSchema()
+	{
+		return $this->getMetaData()->tableSchema;
+	}
+
+	/**
+	 * @return CDbCommandBuilder the command builder used by this AR
+	 */
+	public function getCommandBuilder()
+	{
+		return $this->getDbConnection()->getSchema()->getCommandBuilder();
+	}
+
+	/**
+	 * @param string attribute name
+	 * @return boolean whether this AR has the named attribute (table column).
+	 */
+	public function hasAttribute($name)
+	{
+		return isset($this->getMetaData()->columns[$name]);
+	}
+
+	/**
+	 * Returns the named attribute value.
+	 * If this is a new record and the attribute is not set before,
+	 * the default column value will be returned.
+	 * If this record is the result of a query and the attribute is not loaded,
+	 * null will be returned.
+	 * You may also use $this->AttributeName to obtain the attribute value.
+	 * @param string the attribute name
+	 * @return mixed the attribute value. Null if the attribute is not set or does not exist.
+	 * @see hasAttribute
+	 */
+	public function getAttribute($name)
+	{
+		if(property_exists($this,$name))
+			return $this->$name;
+		else if(isset($this->_attributes[$name]))
+			return $this->_attributes[$name];
+	}
+
+	/**
+	 * Sets the named attribute value.
+	 * You may also use $this->AttributeName to set the attribute value.
+	 * @param string the attribute name
+	 * @param mixed the attribute value.
+	 * @return boolean whether the attribute exists and the assignment is conducted successfully
+	 * @see hasAttribute
+	 */
+	public function setAttribute($name,$value)
+	{
+		if(property_exists($this,$name))
+			$this->$name=$value;
+		else if(isset($this->getMetaData()->columns[$name]))
+			$this->_attributes[$name]=$value;
+		else
+			return false;
+		return true;
+	}
+
+	/**
+	 * Adds a related object to this record.
+	 * This method is used internally by {@link CActiveFinder} to populate related objects.
+	 * @param string attribute name
+	 * @param mixed the related record
+	 * @param boolean whether the relation is HAS_MANY/MANY_MANY.
+	 */
+	public function addRelatedRecord($name,$record,$multiple)
+	{
+		if($multiple)
+		{
+			if(!isset($this->_related[$name]))
+				$this->_related[$name]=array();
+			if($record instanceof TActiveRecord)
+				$this->_related[$name][]=$record;
+		}
+		else if(!isset($this->_related[$name]))
+			$this->_related[$name]=$record;
+	}
+
+	/**
+	 * Returns all column attribute values.
+	 * Note, related objects are not returned.
+	 * @param mixed names of attributes whose value needs to be returned.
+	 * If this is true (default), then all attribute values will be returned, including
+	 * those that are not loaded from DB (null will be returned for those attributes).
+	 * If this is null, all attributes except those that are not loaded from DB will be returned.
+	 * @return array attribute values indexed by attribute names.
+	 */
+	public function getAttributes($names=true)
+	{
+		$attributes=$this->_attributes;
+		foreach($this->getMetaData()->columns as $name=>$column)
+		{
+			if(property_exists($this,$name))
+				$attributes[$name]=$this->$name;
+			else if($names===true && !isset($attributes[$name]))
+				$attributes[$name]=null;
+		}
+		if(is_array($names))
+		{
+			$attrs=array();
+			foreach($names as $name)
+				$attrs[$name]=isset($attributes[$name])?$attributes[$name]:null;
+			return $attrs;
+		}
+		else
+			return $attributes;
+	}
+
+	/**
+	 * Saves the current record.
+	 *
+	 * The record is inserted as a row into the database table if its {@link isNewRecord}
+	 * property is true (usually the case when the record is created using the 'new'
+	 * operator). Otherwise, it will be used to update the corresponding row in the table
+	 * (usually the case if the record is obtained using one of those 'find' methods.)
+	 *
+	 * Validation will be performed before saving the record. If the validation fails,
+	 * the record will not be saved. You can call {@link getErrors()} to retrieve the
+	 * validation errors.
+	 *
+	 * If the record is saved via insertion, its {@link isNewRecord} property will be
+	 * set false, and its {@link scenario} property will be set to be 'update'.
+	 * And if its primary key is auto-incremental and is not set before insertion,
+	 * the primary key will be populated with the automatically generated key value.
+	 *
+	 * @param boolean whether to perform validation before saving the record.
+	 * If the validation fails, the record will not be saved to database.
+	 * @param array list of attributes that need to be saved. Defaults to null,
+	 * meaning all attributes that are loaded from DB will be saved.
+	 * @return boolean whether the saving succeeds
+	 */
+	public function save($runValidation=true,$attributes=null)
+	{
+		if(!$runValidation || $this->validate($attributes))
+			return $this->getIsNewRecord() ? $this->insert($attributes) : $this->update($attributes);
+		else
+			return false;
+	}
+
+	/**
+	 * @return boolean whether the record is new and should be inserted when calling {@link save}.
+	 * This property is automatically set in constructor and {@link populateRecord}.
+	 * Defaults to false, but it will be set to true if the instance is created using
+	 * the new operator.
+	 */
+	public function getIsNewRecord()
+	{
+		return $this->_new;
+	}
+
+	/**
+	 * @param boolean whether the record is new and should be inserted when calling {@link save}.
+	 * @see getIsNewRecord
+	 */
+	public function setIsNewRecord($value)
+	{
+		$this->_new=$value;
+	}
+
+	/**
+	 * This event is raised before the record is saved.
+	 * @param CEvent the event parameter
+	 * @since 1.0.2
+	 */
+	public function onBeforeSave($event)
+	{
+		$this->raiseEvent('onBeforeSave',$event);
+	}
+
+	/**
+	 * This event is raised after the record is saved.
+	 * @param CEvent the event parameter
+	 * @since 1.0.2
+	 */
+	public function onAfterSave($event)
+	{
+		$this->raiseEvent('onAfterSave',$event);
+	}
+
+	/**
+	 * This event is raised before the record is deleted.
+	 * @param CEvent the event parameter
+	 * @since 1.0.2
+	 */
+	public function onBeforeDelete($event)
+	{
+		$this->raiseEvent('onBeforeDelete',$event);
+	}
+
+	/**
+	 * This event is raised after the record is deleted.
+	 * @param CEvent the event parameter
+	 * @since 1.0.2
+	 */
+	public function onAfterDelete($event)
+	{
+		$this->raiseEvent('onAfterDelete',$event);
+	}
+
+	/**
+	 * This event is raised after the record instance is created by new operator.
+	 * @param CEvent the event parameter
+	 * @since 1.0.2
+	 */
+	public function onAfterConstruct($event)
+	{
+		$this->raiseEvent('onAfterConstruct',$event);
+	}
+
+	/**
+	 * This event is raised after the record is instantiated by a find method.
+	 * @param CEvent the event parameter
+	 * @since 1.0.2
+	 */
+	public function onAfterFind($event)
+	{
+		$this->raiseEvent('onAfterFind',$event);
+	}
+
+	/**
+	 * This method is invoked before saving a record (after validation, if any).
+	 * The default implementation raises the {@link onBeforeSave} event.
+	 * You may override this method to do any preparation work for record saving.
+	 * Use {@link isNewRecord} to determine whether the saving is
+	 * for inserting or updating record.
+	 * Make sure you call the parent implementation so that the event is raised properly.
+	 * @return boolean whether the saving should be executed. Defaults to true.
+	 */
+	protected function beforeSave()
+	{
+		$this->onBeforeSave(new TEvent($this));
+		return true;
+	}
+
+	/**
+	 * This method is invoked after saving a record.
+	 * The default implementation raises the {@link onAfterSave} event.
+	 * You may override this method to do postprocessing after record saving.
+	 * Make sure you call the parent implementation so that the event is raised properly.
+	 */
+	protected function afterSave()
+	{
+		$this->onAfterSave(new TEvent($this));
+	}
+
+	/**
+	 * This method is invoked before deleting a record.
+	 * The default implementation raises the {@link onBeforeDelete} event.
+	 * You may override this method to do any preparation work for record deletion.
+	 * Make sure you call the parent implementation so that the event is raised properly.
+	 * @return boolean whether the record should be deleted. Defaults to true.
+	 */
+	protected function beforeDelete()
+	{
+		$this->onBeforeDelete(new TEvent($this));
+		return true;
+	}
+
+	/**
+	 * This method is invoked after deleting a record.
+	 * The default implementation raises the {@link onAfterDelete} event.
+	 * You may override this method to do postprocessing after the record is deleted.
+	 * Make sure you call the parent implementation so that the event is raised properly.
+	 */
+	protected function afterDelete()
+	{
+		$this->onAfterDelete(new TEvent($this));
+	}
+
+	/**
+	 * This method is invoked after a record instance is created by new operator.
+	 * The default implementation raises the {@link onAfterConstruct} event.
+	 * You may override this method to do postprocessing after record creation.
+	 * Make sure you call the parent implementation so that the event is raised properly.
+	 */
+	protected function afterConstruct()
+	{
+		$this->onAfterConstruct(new TEvent($this));
+	}
+
+	/**
+	 * This method is invoked after each record is instantiated by a find method.
+	 * The default implementation raises the {@link onAfterFind} event.
+	 * You may override this method to do postprocessing after each newly found record is instantiated.
+	 * Make sure you call the parent implementation so that the event is raised properly.
+	 */
+	protected function afterFind()
+	{
+		$this->onAfterFind(new TEvent($this));
+	}
+
+	/**
+	 * Calls {@link afterFind}.
+	 * This method is internally used.
+	 * @since 1.0.3
+	 */
+	public function afterFindInternal()
+	{
+		$this->afterFind();
+	}
+
+	/**
+	 * Inserts a row into the table based on this active record attributes.
+	 * If the table's primary key is auto-incremental and is null before insertion,
+	 * it will be populated with the actual value after insertion.
+	 * Note, validation is not performed in this method. You may call {@link validate} to perform the validation.
+	 * After the record is inserted to DB successfully, its {@link isNewRecord} property will be set false,
+	 * and its {@link scenario} property will be set to be 'update'.
+	 * @param array list of attributes that need to be saved. Defaults to null,
+	 * meaning all attributes that are loaded from DB will be saved.
+	 * @return boolean whether the attributes are valid and the record is inserted successfully.
+	 * @throws CException if the record is not new
+	 */
+	public function insert($attributes=null)
+	{
+		if(!$this->getIsNewRecord())
+			throw new TDbException('The active record cannot be inserted to database because it is not new.');
+		if($this->beforeSave())
+		{
+			Prado::trace(get_class($this).'.insert()','System.Db.ActiveRecord.TActiveRecord');
+			$builder=$this->getCommandBuilder();
+			$table=$this->getMetaData()->tableSchema;
+			$command=$builder->createInsertCommand($table,$this->getAttributes($attributes));
+			if($command->execute())
+			{
+				$primaryKey=$table->primaryKey;
+				if($table->sequenceName!==null)
+				{
+					if(is_string($primaryKey) && $this->$primaryKey===null)
+						$this->$primaryKey=$builder->getLastInsertID($table);
+					else if(is_array($primaryKey))
+					{
+						foreach($primaryKey as $pk)
+						{
+							if($this->$pk===null)
+							{
+								$this->$pk=$builder->getLastInsertID($table);
+								break;
+							}
+						}
+					}
+				}
+				$this->afterSave();
+				$this->setIsNewRecord(false);
+				$this->setScenario('update');
+				return true;
+			}
+			else
+				$this->afterSave();
+		}
+		else
+			return false;
+	}
+
+	/**
+	 * Updates the row represented by this active record.
+	 * All loaded attributes will be saved to the database.
+	 * Note, validation is not performed in this method. You may call {@link validate} to perform the validation.
+	 * @param array list of attributes that need to be saved. Defaults to null,
+	 * meaning all attributes that are loaded from DB will be saved.
+	 * @return boolean whether the update is successful
+	 * @throws CException if the record is new
+	 */
+	public function update($attributes=null)
+	{
+		if($this->getIsNewRecord())
+			throw new TDbException('The active record cannot be updated because it is new.');
+		if($this->beforeSave())
+		{
+			Prado::trace(get_class($this).'.update()','System.Db.ActiveRecord.TActiveRecord');
+			$this->updateByPk($this->getPrimaryKey(),$this->getAttributes($attributes));
+			$this->afterSave();
+			return true;
+		}
+		else
+			return false;
+	}
+
+	/**
+	 * Saves a selected list of attributes.
+	 * Unlike {@link save}, this method only saves the specified attributes
+	 * of an existing row dataset. It thus has better performance.
+	 * Note, this method does neither attribute filtering nor validation.
+	 * So do not use this method with untrusted data (such as user posted data).
+	 * You may consider the following alternative if you want to do so:
+	 * <pre>
+	 * $postRecord=Post::model()->findByPk($postID);
+	 * $postRecord->attributes=$_POST['post'];
+	 * $postRecord->save();
+	 * </pre>
+	 * @param array attributes to be updated. Each element represents an attribute name
+	 * or an attribute value indexed by its name. If the latter, the record's
+	 * attribute will be changed accordingly before saving.
+	 * @return boolean whether the update is successful
+	 * @throws CException if the record is new or any database error
+	 */
+	public function saveAttributes($attributes)
+	{
+		if(!$this->getIsNewRecord())
+		{
+			Prado::trace(get_class($this).'.saveAttributes()','System.Db.ActiveRecord.TActiveRecord');
+			$values=array();
+			foreach($attributes as $name=>$value)
+			{
+				if(is_integer($name))
+					$values[$value]=$this->$value;
+				else
+					$values[$name]=$this->$name=$value;
+			}
+			return $this->updateByPk($this->getPrimaryKey(),$values)>0;
+		}
+		else
+			throw new TDbException('The active record cannot be updated because it is new.');
+	}
+
+	/**
+	 * Deletes the row corresponding to this active record.
+	 * @return boolean whether the deletion is successful.
+	 * @throws CException if the record is new
+	 */
+	public function delete()
+	{
+		if(!$this->getIsNewRecord())
+		{
+			Prado::trace(get_class($this).'.delete()','System.Db.ActiveRecord.TActiveRecord');
+			if($this->beforeDelete())
+			{
+				$result=$this->deleteByPk($this->getPrimaryKey())>0;
+				$this->afterDelete();
+				return $result;
+			}
+			else
+				return false;
+		}
+		else
+			throw new TDbException('The active record cannot be deleted because it is new.');
+	}
+
+	/**
+	 * Repopulates this active record with the latest data.
+	 * @return boolean whether the row still exists in the database. If true, the latest data will be populated to this active record.
+	 */
+	public function refresh()
+	{
+		Prado::trace(get_class($this).'.refresh()','System.Db.ActiveRecord.TActiveRecord');
+		if(!$this->getIsNewRecord() && ($record=$this->findByPk($this->getPrimaryKey()))!==null)
+		{
+			$this->_attributes=array();
+			$this->_related=array();
+			foreach($this->getMetaData()->columns as $name=>$column)
+				$this->$name=$record->$name;
+			return true;
+		}
+		else
+			return false;
+	}
+
+	/**
+	 * Compares this active record with another one.
+	 * The comparison is made by comparing the primary key values of the two active records.
+	 * @return boolean whether the two active records refer to the same row in the database table.
+	 */
+	public function equals($record)
+	{
+		return $this->tableName()===$record->tableName() && $this->getPrimaryKey()===$record->getPrimaryKey();
+	}
+
+	/**
+	 * @return mixed the primary key value. An array (column name=>column value) is returned if the primary key is composite.
+	 * If primary key is not defined, null will be returned.
+	 */
+	public function getPrimaryKey()
+	{
+		$table=$this->getMetaData()->tableSchema;
+		if(is_string($table->primaryKey))
+			return $this->{$table->primaryKey};
+		else if(is_array($table->primaryKey))
+		{
+			$values=array();
+			foreach($table->primaryKey as $name)
+				$values[$name]=$this->$name;
+			return $values;
+		}
+		else
+			return null;
+	}
+
+	private function query($criteria,$all=false)
+	{
+		$this->applyScopes($criteria);
+		$command=$this->getCommandBuilder()->createFindCommand($this->getTableSchema(),$criteria);
+		return $all ? $this->populateRecords($command->queryAll()) : $this->populateRecord($command->queryRow());
+	}
+
+	private function applyScopes(&$criteria)
+	{
+		if(($c=$this->getDbCriteria(false))!==null)
+		{
+			$c->mergeWith($criteria);
+			$criteria=$c;
+			$this->_c=null;
+		}
+	}
+
+	/**
+	 * Finds a single active record with the specified condition.
+	 * @param mixed query condition or criteria.
+	 * If a string, it is treated as query condition (the WHERE clause);
+	 * If an array, it is treated as the initial values for constructing a {@link CDbCriteria} object;
+	 * Otherwise, it should be an instance of {@link CDbCriteria}.
+	 * @param array parameters to be bound to an SQL statement.
+	 * This is only used when the first parameter is a string (query condition).
+	 * In other cases, please use {@link CDbCriteria::params} to set parameters.
+	 * @return CActiveRecord the record found. Null if no record is found.
+	 */
+	public function find($condition='',$params=array())
+	{
+		Prado::trace(get_class($this).'.find()','System.Db.ActiveRecord.TActiveRecord');
+		$criteria=$this->getCommandBuilder()->createCriteria($condition,$params);
+		$criteria->limit=1;
+		return $this->query($criteria);
+	}
+
+	/**
+	 * Finds all active records satisfying the specified condition.
+	 * See {@link find()} for detailed explanation about $condition and $params.
+	 * @param mixed query condition or criteria.
+	 * @param array parameters to be bound to an SQL statement.
+	 * @return array list of active records satisfying the specified condition. An empty array is returned if none is found.
+	 */
+	public function findAll($condition='',$params=array())
+	{
+		Prado::trace(get_class($this).'.findAll()','System.Db.ActiveRecord.TActiveRecord');
+		$criteria=$this->getCommandBuilder()->createCriteria($condition,$params);
+		return $this->query($criteria,true);
+	}
+
+	/**
+	 * Finds a single active record with the specified primary key.
+	 * See {@link find()} for detailed explanation about $condition and $params.
+	 * @param mixed primary key value(s). Use array for multiple primary keys. For composite key, each key value must be an array (column name=>column value).
+	 * @param mixed query condition or criteria.
+	 * @param array parameters to be bound to an SQL statement.
+	 * @return CActiveRecord the record found. Null if none is found.
+	 */
+	public function findByPk($pk,$condition='',$params=array())
+	{
+		Prado::trace(get_class($this).'.findByPk()','System.Db.ActiveRecord.TActiveRecord');
+		$criteria=$this->getCommandBuilder()->createPkCriteria($this->getTableSchema(),$pk,$condition,$params);
+		$criteria->limit=1;
+		return $this->query($criteria);
+	}
+
+	/**
+	 * Finds all active records with the specified primary keys.
+	 * See {@link find()} for detailed explanation about $condition and $params.
+	 * @param mixed primary key value(s). Use array for multiple primary keys. For composite key, each key value must be an array (column name=>column value).
+	 * @param mixed query condition or criteria.
+	 * @param array parameters to be bound to an SQL statement.
+	 * @return array the records found. An empty array is returned if none is found.
+	 */
+	public function findAllByPk($pk,$condition='',$params=array())
+	{
+		Prado::trace(get_class($this).'.findAllByPk()','System.Db.ActiveRecord.TActiveRecord');
+		$criteria=$this->getCommandBuilder()->createPkCriteria($this->getTableSchema(),$pk,$condition,$params);
+		return $this->query($criteria,true);
+	}
+
+	/**
+	 * Finds a single active record that has the specified attribute values.
+	 * See {@link find()} for detailed explanation about $condition and $params.
+	 * @param array list of attribute values (indexed by attribute names) that the active records should match.
+	 * @param mixed query condition or criteria.
+	 * @param array parameters to be bound to an SQL statement.
+	 * @return CActiveRecord the record found. Null if none is found.
+	 */
+	public function findByAttributes($attributes,$condition='',$params=array())
+	{
+		Prado::trace(get_class($this).'.findByAttributes()','System.Db.ActiveRecord.TActiveRecord');
+		$criteria=$this->getCommandBuilder()->createColumnCriteria($this->getTableSchema(),$attributes,$condition,$params);
+		$criteria->limit=1;
+		return $this->query($criteria);
+	}
+
+	/**
+	 * Finds all active records that have the specified attribute values.
+	 * See {@link find()} for detailed explanation about $condition and $params.
+	 * @param array list of attribute values (indexed by attribute names) that the active records should match.
+	 * @param mixed query condition or criteria.
+	 * @param array parameters to be bound to an SQL statement.
+	 * @return array the records found. An empty array is returned if none is found.
+	 */
+	public function findAllByAttributes($attributes,$condition='',$params=array())
+	{
+		Prado::trace(get_class($this).'.findAllByAttributes()','System.Db.ActiveRecord.TActiveRecord');
+		$criteria=$this->getCommandBuilder()->createColumnCriteria($this->getTableSchema(),$attributes,$condition,$params);
+		return $this->query($criteria,true);
+	}
+
+	/**
+	 * Finds a single active record with the specified SQL statement.
+	 * @param string the SQL statement
+	 * @param array parameters to be bound to the SQL statement
+	 * @return CActiveRecord the record found. Null if none is found.
+	 */
+	public function findBySql($sql,$params=array())
+	{
+		Prado::trace(get_class($this).'.findBySql()','System.Db.ActiveRecord.TActiveRecord');
+		$command=$this->getCommandBuilder()->createSqlCommand($sql,$params);
+		return $this->populateRecord($command->queryRow());
+	}
+
+	/**
+	 * Finds all active records using the specified SQL statement.
+	 * @param string the SQL statement
+	 * @param array parameters to be bound to the SQL statement
+	 * @return array the records found. An empty array is returned if none is found.
+	 */
+	public function findAllBySql($sql,$params=array())
+	{
+		Prado::trace(get_class($this).'.findAllBySql()','System.Db.ActiveRecord.TActiveRecord');
+		$command=$this->getCommandBuilder()->createSqlCommand($sql,$params);
+		return $this->populateRecords($command->queryAll());
+	}
+
+	/**
+	 * Finds the number of rows satisfying the specified query condition.
+	 * See {@link find()} for detailed explanation about $condition and $params.
+	 * @param mixed query condition or criteria.
+	 * @param array parameters to be bound to an SQL statement.
+	 * @return integer the number of rows satisfying the specified query condition.
+	 */
+	public function count($condition='',$params=array())
+	{
+		Prado::trace(get_class($this).'.count()','System.Db.ActiveRecord.TActiveRecord');
+		$builder=$this->getCommandBuilder();
+		$criteria=$builder->createCriteria($condition,$params);
+		$this->applyScopes($criteria);
+		return $builder->createCountCommand($this->getTableSchema(),$criteria)->queryScalar();
+	}
+
+	/**
+	 * Finds the number of rows using the given SQL statement.
+	 * See {@link find()} for detailed explanation about $condition and $params.
+	 * @param string the SQL statement
+	 * @param array parameters to be bound to the SQL statement
+	 * @return integer the number of rows using the given SQL statement.
+	 */
+	public function countBySql($sql,$params=array())
+	{
+		Prado::trace(get_class($this).'.countBySql()','System.Db.ActiveRecord.TActiveRecord');
+		return $this->getCommandBuilder()->createSqlCommand($sql,$params)->queryScalar();
+	}
+
+	/**
+	 * Checks whether there is row satisfying the specified condition.
+	 * See {@link find()} for detailed explanation about $condition and $params.
+	 * @param mixed query condition or criteria.
+	 * @param array parameters to be bound to an SQL statement.
+	 * @return boolean whether there is row satisfying the specified condition.
+	 */
+	public function exists($condition,$params=array())
+	{
+		Prado::trace(get_class($this).'.exists()','System.Db.ActiveRecord.TActiveRecord');
+		$builder=$this->getCommandBuilder();
+		$criteria=$builder->createCriteria($condition,$params);
+		$table=$this->getTableSchema();
+		$criteria->select=reset($table->columns)->rawName;
+		$criteria->limit=1;
+		$this->applyScopes($criteria);
+		return $builder->createFindCommand($table,$criteria)->queryRow()!==false;
+	}
+
+	/**
+	 * Specifies which related objects should be eagerly loaded.
+	 * This method takes variable number of parameters. Each parameter specifies
+	 * the name of a relation or child-relation. For example,
+	 * <pre>
+	 * // find all posts together with their author and comments
+	 * Post::model()->with('author','comments')->findAll();
+	 * // find all posts together with their author and the author's profile
+	 * Post::model()->with('author','author.profile')->findAll();
+	 * </pre>
+	 * The relations should be declared in {@link relations()}.
+	 *
+	 * By default, the options specified in {@link relations()} will be used
+	 * to do relational query. In order to customize the options on the fly,
+	 * we should pass an array parameter to the with() method. The array keys
+	 * are relation names, and the array values are the corresponding query options.
+	 * For example,
+	 * <pre>
+	 * Post::model()->with(array(
+	 *     'author'=>array('select'=>'id, name'),
+	 *     'comments'=>array('condition'=>'approved=1', 'order'=>'createTime'),
+	 * ))->findAll();
+	 * </pre>
+	 *
+	 * This method returns a {@link CActiveFinder} instance that provides
+	 * a set of find methods similar to that of CActiveRecord.
+	 *
+	 * Note, the possible parameters to this method have been changed since version 1.0.2.
+	 * Previously, it was not possible to specify on-th-fly query options,
+	 * and child-relations were specified as hierarchical arrays.
+	 *
+	 * @return CActiveFinder the active finder instance. If no parameter is passed in, the object itself will be returned.
+	 */
+	public function with()
+	{
+		if(func_num_args()>0)
+		{
+			$with=func_get_args();
+			if(is_array($with[0]))  // the parameter is given as an array
+				$with=$with[0];
+			$finder=new TActiveFinder($this,$with,$this->getDbCriteria(false));
+			$this->_c=null;
+			return $finder;
+		}
+		else
+			return $this;
+	}
+
+	/**
+	 * Updates records with the specified primary key(s).
+	 * See {@link find()} for detailed explanation about $condition and $params.
+	 * Note, the attributes are not checked for safety and validation is NOT performed.
+	 * @param mixed primary key value(s). Use array for multiple primary keys. For composite key, each key value must be an array (column name=>column value).
+	 * @param array list of attributes (name=>$value) to be updated
+	 * @param mixed query condition or criteria.
+	 * @param array parameters to be bound to an SQL statement.
+	 * @return integer the number of rows being updated
+	 */
+	public function updateByPk($pk,$attributes,$condition='',$params=array())
+	{
+		Prado::trace(get_class($this).'.updateByPk()','System.Db.ActiveRecord.TActiveRecord');
+		$builder=$this->getCommandBuilder();
+		$table=$this->getTableSchema();
+		$criteria=$builder->createPkCriteria($table,$pk,$condition,$params);
+		$this->applyScopes($criteria);
+		$command=$builder->createUpdateCommand($table,$attributes,$criteria);
+		return $command->execute();
+	}
+
+	/**
+	 * Updates records with the specified condition.
+	 * See {@link find()} for detailed explanation about $condition and $params.
+	 * Note, the attributes are not checked for safety and no validation is done.
+	 * @param array list of attributes (name=>$value) to be updated
+	 * @param mixed query condition or criteria.
+	 * @param array parameters to be bound to an SQL statement.
+	 * @return integer the number of rows being updated
+	 */
+	public function updateAll($attributes,$condition='',$params=array())
+	{
+		Prado::trace(get_class($this).'.updateAll()','System.Db.ActiveRecord.TActiveRecord');
+		$builder=$this->getCommandBuilder();
+		$criteria=$builder->createCriteria($condition,$params);
+		$this->applyScopes($criteria);
+		$command=$builder->createUpdateCommand($this->getTableSchema(),$attributes,$criteria);
+		return $command->execute();
+	}
+
+	/**
+	 * Updates one or several counter columns.
+	 * Note, this updates all rows of data unless a condition or criteria is specified.
+	 * See {@link find()} for detailed explanation about $condition and $params.
+	 * @param array the counters to be updated (column name=>increment value)
+	 * @param mixed query condition or criteria.
+	 * @param array parameters to be bound to an SQL statement.
+	 * @return integer the number of rows being updated
+	 */
+	public function updateCounters($counters,$condition='',$params=array())
+	{
+		Prado::trace(get_class($this).'.updateCounters()','System.Db.ActiveRecord.TActiveRecord');
+		$builder=$this->getCommandBuilder();
+		$criteria=$builder->createCriteria($condition,$params);
+		$this->applyScopes($criteria);
+		$command=$builder->createUpdateCounterCommand($this->getTableSchema(),$counters,$criteria);
+		return $command->execute();
+	}
+
+	/**
+	 * Deletes rows with the specified primary key.
+	 * See {@link find()} for detailed explanation about $condition and $params.
+	 * @param mixed primary key value(s). Use array for multiple primary keys. For composite key, each key value must be an array (column name=>column value).
+	 * @param mixed query condition or criteria.
+	 * @param array parameters to be bound to an SQL statement.
+	 * @return integer the number of rows deleted
+	 */
+	public function deleteByPk($pk,$condition='',$params=array())
+	{
+		Prado::trace(get_class($this).'.deleteByPk()','System.Db.ActiveRecord.TActiveRecord');
+		$builder=$this->getCommandBuilder();
+		$criteria=$builder->createPkCriteria($this->getTableSchema(),$pk,$condition,$params);
+		$this->applyScopes($criteria);
+		$command=$builder->createDeleteCommand($this->getTableSchema(),$criteria);
+		return $command->execute();
+	}
+
+	/**
+	 * Deletes rows with the specified condition.
+	 * See {@link find()} for detailed explanation about $condition and $params.
+	 * @param mixed query condition or criteria.
+	 * @param array parameters to be bound to an SQL statement.
+	 * @return integer the number of rows deleted
+	 */
+	public function deleteAll($condition='',$params=array())
+	{
+		Prado::trace(get_class($this).'.deleteAll()','System.Db.ActiveRecord.TActiveRecord');
+		$builder=$this->getCommandBuilder();
+		$criteria=$builder->createCriteria($condition,$params);
+		$this->applyScopes($criteria);
+		$command=$builder->createDeleteCommand($this->getTableSchema(),$criteria);
+		return $command->execute();
+	}
+
+	/**
+	 * Creates an active record with the given attributes.
+	 * This method is internally used by the find methods.
+	 * @param array attribute values (column name=>column value)
+	 * @param boolean whether to call {@link afterFind} after the record is populated.
+	 * This parameter is added in version 1.0.3.
+	 * @return CActiveRecord the newly created active record. The class of the object is the same as the model class.
+	 * Null is returned if the input data is false.
+	 */
+	public function populateRecord($attributes,$callAfterFind=true)
+	{
+		if($attributes!==false)
+		{
+			$record=$this->instantiate($attributes);
+			$record->_md=$this->getMetaData();
+			foreach($attributes as $name=>$value)
+			{
+				if(property_exists($record,$name))
+					$record->$name=$value;
+				else if(isset($record->_md->columns[$name]))
+					$record->_attributes[$name]=$value;
+			}
+			$record->attachBehaviors($record->behaviors());
+			if($callAfterFind)
+				$record->afterFind();
+			return $record;
+		}
+		else
+			return null;
+	}
+
+	/**
+	 * Creates a list of active records based on the input data.
+	 * This method is internally used by the find methods.
+	 * @param array list of attribute values for the active records.
+	 * @param boolean whether to call {@link afterFind} after each record is populated.
+	 * This parameter is added in version 1.0.3.
+	 * @return array list of active records.
+	 */
+	public function populateRecords($data,$callAfterFind=true)
+	{
+		$records=array();
+		$md=$this->getMetaData();
+		$table=$md->tableSchema;
+		foreach($data as $attributes)
+		{
+			$record=$this->instantiate($attributes);
+			$record->_md=$md;
+			foreach($attributes as $name=>$value)
+			{
+				if(property_exists($record,$name))
+					$record->$name=$value;
+				else if(isset($record->_md->columns[$name]))
+					$record->_attributes[$name]=$value;
+			}
+			$record->attachBehaviors($record->behaviors());
+			if($callAfterFind)
+				$record->afterFind();
+			$records[]=$record;
+		}
+		return $records;
+	}
+
+	/**
+	 * Creates an active record instance.
+	 * This method is called by {@link populateRecord} and {@link populateRecords}.
+	 * You may override this method if the instance being created
+	 * depends the attributes that are to be populated to the record.
+	 * For example, by creating a record based on the value of a column,
+	 * you may implement the so-called single-table inheritance mapping.
+	 * @param array list of attribute values for the active records.
+	 * @return CActiveRecord the active record
+	 * @since 1.0.2
+	 */
+	protected function instantiate($attributes)
+	{
+		$class=get_class($this);
+		$model=new $class(null);
+		$model->setScenario('update');
+		return $model;
+	}
+
+	/**
+	 * Returns whether there is an element at the specified offset.
+	 * This method is required by the interface ArrayAccess.
+	 * @param mixed the offset to check on
+	 * @return boolean
+	 * @since 1.0.2
+	 */
+	public function offsetExists($offset)
+	{
+		return isset($this->getMetaData()->columns[$offset]);
+	}
+}
+
+
+/**
+ * CBaseActiveRelation is the base class for all active relations.
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id: CActiveRecord.php 1127 2009-06-13 20:26:35Z qiang.xue $
+ * @package System.Db.ActiveRecord
+ * @since 1.0.4
+ */
+class TBaseActiveRelation extends TComponent
+{
+	/**
+	 * @var string name of the related object
+	 */
+	public $name;
+	/**
+	 * @var string name of the related active record class
+	 */
+	public $className;
+	/**
+	 * @var string the foreign key in this relation
+	 */
+	public $foreignKey;
+	/**
+	 * @var mixed list of column names (an array, or a string of names separated by commas) to be selected.
+	 * Do not quote or prefix the column names unless they are used in an expression.
+	 * In that case, you should prefix the column names with '??.'.
+	 */
+	public $select='*';
+	/**
+	 * @var string WHERE clause. For {@link CActiveRelation} descendant classes, column names
+	 * referenced in the condition should be disambiguated with prefix '??.'.
+	 */
+	public $condition='';
+	/**
+	 * @var array the parameters that are to be bound to the condition.
+	 * The keys are parameter placeholder names, and the values are parameter values.
+	 */
+	public $params=array();
+	/**
+	 * @var string GROUP BY clause. For {@link CActiveRelation} descendant classes, column names
+	 * referenced in this property should be disambiguated with prefix '??.'.
+	 */
+	public $group='';
+	/**
+	 * @var string HAVING clause. For {@link CActiveRelation} descendant classes, column names
+	 * referenced in this property should be disambiguated with prefix '??.'.
+	 */
+	public $having='';
+	/**
+	 * @var string ORDER BY clause. For {@link CActiveRelation} descendant classes, column names
+	 * referenced in this property should be disambiguated with prefix '??.'.
+	 */
+	public $order='';
+
+	/**
+	 * Constructor.
+	 * @param string name of the relation
+	 * @param string name of the related active record class
+	 * @param string foreign key for this relation
+	 * @param array additional options (name=>value). The keys must be the property names of this class.
+	 */
+	public function __construct($name,$className,$foreignKey,$options=array())
+	{
+		$this->name=$name;
+		$this->className=$className;
+		$this->foreignKey=$foreignKey;
+		foreach($options as $name=>$value)
+			$this->$name=$value;
+	}
+
+	/**
+	 * Merges this relation with a criteria specified dynamically.
+	 * @param array the dynamically specified criteria
+	 * @since 1.0.5
+	 */
+	public function mergeWith($criteria)
+	{
+		if(isset($criteria['select']) && $this->select!==$criteria['select'])
+		{
+			if($this->select==='*')
+				$this->select=$criteria['select'];
+			else if($criteria['select']!=='*')
+			{
+				$select1=is_string($this->select)?preg_split('/\s*,\s*/',trim($this->select),-1,PREG_SPLIT_NO_EMPTY):$this->select;
+				$select2=is_string($criteria['select'])?preg_split('/\s*,\s*/',trim($criteria['select']),-1,PREG_SPLIT_NO_EMPTY):$criteria['select'];
+				$this->select=array_merge($select1,array_diff($select2,$select1));
+			}
+		}
+
+		if(isset($criteria['condition']) && $this->condition!==$criteria['condition'])
+		{
+			if($this->condition==='')
+				$this->condition=$criteria['condition'];
+			else if($criteria['condition']!=='')
+				$this->condition="({$this->condition}) AND ({$criteria['condition']})";
+		}
+
+		if(isset($criteria['params']) && $this->params!==$criteria['params'])
+			$this->params=array_merge($this->params,$criteria['params']);
+
+		if(isset($criteria['order']) && $this->order!==$criteria['order'])
+		{
+			if($this->order==='')
+				$this->order=$criteria['order'];
+			else if($criteria['order']!=='')
+				$this->order.=', '.$criteria['order'];
+		}
+
+		if(isset($criteria['group']) && $this->group!==$criteria['group'])
+		{
+			if($this->group==='')
+				$this->group=$criteria['group'];
+			else if($criteria['group']!=='')
+				$this->group.=', '.$criteria['group'];
+		}
+
+		if(isset($criteria['having']) && $this->having!==$criteria['having'])
+		{
+			if($this->having==='')
+				$this->having=$criteria['having'];
+			else if($criteria['having']!=='')
+				$this->having="({$this->having}) AND ({$criteria['having']})";
+		}
+	}
+}
+
+
+/**
+ * CStatRelation represents a statistical relational query.
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id: CActiveRecord.php 1127 2009-06-13 20:26:35Z qiang.xue $
+ * @package System.Db.ActiveRecord
+ * @since 1.0.4
+ */
+class TStatRelation extends TBaseActiveRelation
+{
+	/**
+	 * @var string the statistical expression. Defaults to 'COUNT(*)', meaning
+	 * the count of child objects.
+	 */
+	public $select='COUNT(*)';
+	/**
+	 * @var mixed the default value to be assigned to those records that do not
+	 * receive a statistical query result. Defaults to 0.
+	 */
+	public $defaultValue=0;
+
+	/**
+	 * Merges this relation with a criteria specified dynamically.
+	 * @param array the dynamically specified criteria
+	 * @since 1.0.5
+	 */
+	public function mergeWith($criteria)
+	{
+		parent::mergeWith($criteria);
+
+		if(isset($criteria['defaultValue']))
+			$this->defaultValue=$criteria['defaultValue'];
+	}
+}
+
+
+/**
+ * CActiveRelation is the base class for representing active relations that bring back related objects.
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id: CActiveRecord.php 1127 2009-06-13 20:26:35Z qiang.xue $
+ * @package System.Db.ActiveRecord
+ * @since 1.0
+ */
+class TActiveRelation extends TBaseActiveRelation
+{
+	/**
+	 * @var string join type. Defaults to 'LEFT OUTER JOIN'.
+	 */
+	public $joinType='LEFT OUTER JOIN';
+	/**
+	 * @var string ON clause. The condition specified here will be appended to the joining condition using AND operator.
+	 * @since 1.0.2
+	 */
+	public $on='';
+	/**
+	 * @var string the alias for the table that this relation refers to. Defaults to null, meaning
+	 * the alias will be the same as the relation name.
+	 * @since 1.0.1
+	 */
+	public $alias;
+	/**
+	 * @var string|array specifies which related objects should be eagerly loaded when this related object is lazily loaded.
+	 * For more details about this property, see {@link CActiveRecord::with()}.
+	 */
+	public $with=array();
+
+	/**
+	 * Merges this relation with a criteria specified dynamically.
+	 * @param array the dynamically specified criteria
+	 * @since 1.0.5
+	 */
+	public function mergeWith($criteria)
+	{
+		if(isset($criteria['condition']) && $this->on!==$criteria['condition'])
+		{
+			if($this->on==='')
+				$this->on=$criteria['condition'];
+			else if($criteria['condition']!=='')
+				$this->on="({$this->on}) AND ({$criteria['condition']})";
+		}
+		unset($criteria['condition']);
+
+		parent::mergeWith($criteria);
+
+		if(isset($criteria['joinType']))
+			$this->joinType=$criteria['joinType'];
+
+		if(isset($criteria['on']) && $this->on!==$criteria['on'])
+		{
+			if($this->on==='')
+				$this->on=$criteria['on'];
+			else if($criteria['on']!=='')
+				$this->on="({$this->on}) AND ({$criteria['on']})";
+		}
+
+		if(isset($criteria['with']))
+			$this->with=$criteria['with'];
+
+		if(isset($criteria['alias']))
+			$this->alias=$criteria['alias'];
+
+		if(isset($criteria['together']))
+			$this->together=$criteria['together'];
+	}
+}
+
+
+/**
+ * CBelongsToRelation represents the parameters specifying a BELONGS_TO relation.
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id: CActiveRecord.php 1127 2009-06-13 20:26:35Z qiang.xue $
+ * @package System.Db.ActiveRecord
+ * @since 1.0
+ */
+class TBelongsToRelation extends TActiveRelation
+{
+}
+
+
+/**
+ * CHasOneRelation represents the parameters specifying a HAS_ONE relation.
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id: CActiveRecord.php 1127 2009-06-13 20:26:35Z qiang.xue $
+ * @package System.Db.ActiveRecord
+ * @since 1.0
+ */
+class THasOneRelation extends TActiveRelation
+{
+}
+
+
+/**
+ * CHasManyRelation represents the parameters specifying a HAS_MANY relation.
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id: CActiveRecord.php 1127 2009-06-13 20:26:35Z qiang.xue $
+ * @package System.Db.ActiveRecord
+ * @since 1.0
+ */
+class THasManyRelation extends TActiveRelation
+{
+	/**
+	 * @var integer limit of the rows to be selected. It is effective only for lazy loading this related object. Defaults to -1, meaning no limit.
+	 */
+	public $limit=-1;
+	/**
+	 * @var integer offset of the rows to be selected. It is effective only for lazy loading this related object. Defaults to -1, meaning no offset.
+	 */
+	public $offset=-1;
+	/**
+	 * @var boolean whether this table should be joined with the primary table.
+	 * When setting this property to be false, the table associated with this relation will
+	 * appear in a separate JOIN statement. Defaults to true, meaning the table will be joined
+	 * together with the primary table. Note that in version 1.0.x, the default value of this property was false.
+	 */
+	public $together=true;
+
+	/**
+	 * Merges this relation with a criteria specified dynamically.
+	 * @param array the dynamically specified criteria
+	 * @since 1.0.5
+	 */
+	public function mergeWith($criteria)
+	{
+		parent::mergeWith($criteria);
+		if(isset($criteria['limit']) && $criteria['limit']>0)
+			$this->limit=$criteria['limit'];
+
+		if(isset($criteria['offset']) && $criteria['offset']>=0)
+			$this->offset=$criteria['offset'];
+	}
+}
+
+
+/**
+ * CManyManyRelation represents the parameters specifying a MANY_MANY relation.
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id: CActiveRecord.php 1127 2009-06-13 20:26:35Z qiang.xue $
+ * @package System.Db.ActiveRecord
+ * @since 1.0
+ */
+class TManyManyRelation extends THasManyRelation
+{
+}
+
+
+/**
+ * CActiveRecordMetaData represents the meta-data for an Active Record class.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id: CActiveRecord.php 1127 2009-06-13 20:26:35Z qiang.xue $
+ * @package System.Db.ActiveRecord
+ * @since 1.0
+ */
+class TActiveRecordMetaData
+{
+	/**
+	 * @var CDbTableSchema the table schema information
+	 */
+	public $tableSchema;
+	/**
+	 * @var array table columns
+	 */
+	public $columns;
+	/**
+	 * @var array list of relations
+	 */
+	public $relations=array();
+	/**
+	 * @var array attribute default values
+	 */
+	public $attributeDefaults=array();
+
+	private $_model;
+
+	/**
+	 * Constructor.
+	 * @param CActiveRecord the model instance
+	 */
+	public function __construct($model)
+	{
+		$this->_model=$model;
+
+		$tableName=$model->tableName();
+		if(($table=$model->getDbConnection()->getSchema()->getTable($tableName))===null)
+			throw new TDbException('The table "'.$tableName.'" for active record class "'.get_class($model).'" cannot be found in the database.');
+			
+		if($table->primaryKey===null)
+			$table->primaryKey=$model->primaryKey();
+		$this->tableSchema=$table;
+		$this->columns=$table->columns;
+
+		foreach($table->columns as $name=>$column)
+		{
+			if(!$column->isPrimaryKey && $column->defaultValue!==null)
+				$this->attributeDefaults[$name]=$column->defaultValue;
+		}
+
+		foreach($model->relations() as $name=>$config)
+		{
+			if(isset($config[0],$config[1],$config[2]))  // relation class, AR class, FK
+				$this->relations[$name]=new $config[0]($name,$config[1],$config[2],array_slice($config,3));
+			else
+				throw new TDbException('Active record "'.get_class($model).'" has an invalid configuration for relation "'.$name.'". It must specify the relation type, the related active record class and the foreign key.');
+		}
+	}
+}
+
+/**
+ * TActiveRecordInvalidFinderResult class.
+ * TActiveRecordInvalidFinderResult defines the enumerable type for possible results
+ * if an invalid {@link TActiveRecord::__call magic-finder} invoked.
+ *
+ * The following enumerable values are defined:
+ * - Null: return null (default)
+ * - Exception: throws a TActiveRecordException
+ *
+ * @author Yves Berkholz <godzilla80@gmx.net>
+ * @version $Id: TActiveRecord.php 2649 2009-05-11 07:44:55Z godzilla80@gmx.net $
+ * @package System.Data.ActiveRecord
+ * @see TActiveRecordManager::setInvalidFinderResult
+ * @see TActiveRecordConfig::setInvalidFinderResult
+ * @see TActiveRecord::setInvalidFinderResult
+ * @since 3.1.5
+ */
+class TActiveRecordInvalidFinderResult extends TEnumerable
+{
+	const Null = 'Null';
+	const Exception = 'Exception';
+}
diff --git a/framework/Db/ActiveRecord/TActiveRecordBehavior.php b/framework/Db/ActiveRecord/TActiveRecordBehavior.php
new file mode 100644
index 00000000..1e4ccbae
--- /dev/null
+++ b/framework/Db/ActiveRecord/TActiveRecordBehavior.php
@@ -0,0 +1,94 @@
+<?php
+/**
+ * CActiveRecordBehavior class file.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright &copy; 2008-2009 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+/**
+ * CActiveRecordBehavior is the base class for behaviors that can be attached to {@link CActiveRecord}.
+ * Compared with {@link CModelBehavior}, CActiveRecordBehavior attaches to more events
+ * that are only defined by {@link CActiveRecord}.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id: CActiveRecordBehavior.php 564 2009-01-21 22:07:10Z qiang.xue $
+ * @package System.Db.ActiveRecord
+ * @since 1.0.2
+ */
+class TActiveRecordBehavior extends TModelBehavior
+{
+	/**
+	 * Declares events and the corresponding event handler methods.
+	 * If you override this method, make sure you merge the parent result to the return value.
+	 * @return array events (array keys) and the corresponding event handler methods (array values).
+	 * @see CBehavior::events
+	 */
+	public function events()
+	{
+		return array_merge(parent::events(), array(
+			'onBeforeSave'=>'beforeSave',
+			'onAfterSave'=>'afterSave',
+			'onBeforeDelete'=>'beforeDelete',
+			'onAfterDelete'=>'afterDelete',
+			'onAfterConstruct'=>'afterConstruct',
+			'onAfterFind'=>'afterFind',
+		));
+	}
+
+	/**
+	 * Responds to {@link CActiveRecord::onBeforeSave} event.
+	 * Overrides this method if you want to handle the corresponding event of the {@link CBehavior::owner owner}.
+	 * @param CEvent event parameter
+	 */
+	public function beforeSave($event)
+	{
+	}
+
+	/**
+	 * Responds to {@link CActiveRecord::onAfterSave} event.
+	 * Overrides this method if you want to handle the corresponding event of the {@link CBehavior::owner owner}.
+	 * @param CEvent event parameter
+	 */
+	public function afterSave($event)
+	{
+	}
+
+	/**
+	 * Responds to {@link CActiveRecord::onBeforeDelete} event.
+	 * Overrides this method if you want to handle the corresponding event of the {@link CBehavior::owner owner}.
+	 * @param CEvent event parameter
+	 */
+	public function beforeDelete($event)
+	{
+	}
+
+	/**
+	 * Responds to {@link CActiveRecord::onAfterDelete} event.
+	 * Overrides this method if you want to handle the corresponding event of the {@link CBehavior::owner owner}.
+	 * @param CEvent event parameter
+	 */
+	public function afterDelete($event)
+	{
+	}
+
+	/**
+	 * Responds to {@link CActiveRecord::onAfterConstruct} event.
+	 * Overrides this method if you want to handle the corresponding event of the {@link CBehavior::owner owner}.
+	 * @param CEvent event parameter
+	 */
+	public function afterConstruct($event)
+	{
+	}
+
+	/**
+	 * Responds to {@link CActiveRecord::onAfterFind} event.
+	 * Overrides this method if you want to handle the corresponding event of the {@link CBehavior::owner owner}.
+	 * @param CEvent event parameter
+	 */
+	public function afterFind($event)
+	{
+	}
+}
diff --git a/framework/Db/ActiveRecord/TActiveRecordCriteria.php b/framework/Db/ActiveRecord/TActiveRecordCriteria.php
new file mode 100644
index 00000000..9dded69a
--- /dev/null
+++ b/framework/Db/ActiveRecord/TActiveRecordCriteria.php
@@ -0,0 +1,254 @@
+<?php
+/**
+ * TActiveRecordCriteria class file
+ * Adapts *deprecated* Prado TActiveRecordCriteria to TDbCriteria (Yii)
+ * @class TActiveRecordCriteria
+ * @deprecated
+ * @author Daniel Mueller <tux@penguinfriends.org>
+ */
+
+Prado::using('System.Db.Schema.TDbCriteria');
+
+class TSqlCriteria extends TDbCriteria
+{
+	
+	private $_TDbCriteria = null;
+
+	public function __construct($condition=null, $parameters=array())
+	{
+		if(!is_array($parameters) && func_num_args() > 1)
+			$parameters = array_slice(func_get_args(), 1);
+
+		$this->_TDbCriteria = $this;
+		
+		$this->_TDbCriteria->params = new ArrayObject();
+
+		$param = array(
+			'condition' => ($condition !== null) ? $condition : '',
+			'params' => $parameters
+		);
+	}
+
+	public function getCondition()
+	{
+		return $this->_TDbCriteria->condition;
+	}
+
+	public function setCondition($value)
+	{
+		if(empty($value))
+			return;
+
+		// supporting the following SELECT-syntax:
+		// [ORDER BY {col_name | expr | position}
+		//      [ASC | DESC], ...]
+		//    [LIMIT {[offset,] row_count | row_count OFFSET offset}]
+		// See: http://dev.mysql.com/doc/refman/5.0/en/select.html
+				
+				
+		if(preg_match('/ORDER\s+BY\s+(.*?)(?=LIMIT)|ORDER\s+BY\s+(.*?)$/i', $value, $matches) > 0) {
+			// condition contains ORDER BY
+			$value = str_replace($matches[0], '', $value);
+			if(strlen($matches[1]) > 0) {
+				$this->_TDbCriteria->setOrdersBy($matches[1]);
+			} else if(strlen($matches[2]) > 0) {
+				$this->setOrdersBy($matches[2]);
+			}
+		}
+			
+		if(preg_match('/LIMIT\s+([\d\s,]+)/i', $value, $matches) > 0) {
+				// condition contains limit
+			$value = str_replace($matches[0], '', $value); 
+			// remove limit from query
+			if(strpos($matches[1], ',')) { // both offset and limit given
+				list($offset, $limit) = explode(',', $matches[1]);
+				$this->_TDbCriteria->limit = (int)$limit;
+				$this->_TDbCriteria->offset = (int)$offset;
+			} else { // only limit given
+				$this->_TDbCriteria->limit = (int)$matches[1];
+			}
+		}
+
+		if(preg_match('/OFFSET\s+(\d+)/i', $value, $matches) > 0) {
+			// condition contains offset
+			$value = str_replace($matches[0], '', $value); 
+			// remove offset from query
+			$this->_TDbCriteria->offset = (int)$matches[1]; // set offset in criteria
+		}
+		
+		$this->_TDbCriteria->condition = trim($value);
+	}
+
+	public function getParameters()
+	{
+		return $this->_TDbCriteria->params;
+	}
+
+	public function setParameters($value)
+	{
+		if(is_array($value))
+		{
+			$this->_TDbCriteria->params = $value;
+		}
+		elseif ($value instanceof ArrayAccess)
+		{
+			$this->_TDbCriteria->params = (array)$value;
+		}
+		else
+			throw new TException('Value must be an array or of type ArrayAccess.');
+	}
+
+	public function getIsNamedParameters()
+	{
+		foreach($this->_TDbCriteria->params as $key=>$val)
+			return is_string($key);
+	}
+
+	public function getLimit()
+	{
+		return ($this->_TDbCriteria->limit != -1) ? $this->_TDbCriteria->limit : null;
+	}
+
+	public function setLimit($value)
+	{
+		$this->_TDbCriteria->limit = (int)$value;
+	}
+
+	public function getOffset()
+	{
+		return ($this->_TDbCriteria->offset != -1) ? $this->_TDbCriteria->offset : null;
+	}
+
+	public function setOffset($value)
+	{
+		$this->_TDbCriteria->offset = (int)$value;
+	}
+	
+	public function getOrdersBy()
+	{
+		if(empty($this->_TDbCriteria->order))
+			return array();
+
+		$value=trim(preg_replace('/\s+/',' ', $this->_TDbCriteria->order));
+		$orderBys=array();
+		foreach(explode(',',$value) as $orderBy)
+		{
+			$vs=explode(' ',trim($orderBy));
+			
+		$orderBys[$vs[0]]=isset($vs[1])?$vs[1]:'asc';
+		}
+		return $orderBys;
+	}
+
+	public function setOrdersBy($value)
+	{
+		if(is_string($value))
+			$this->TDbCriteria->order = $value;
+		elseif (is_array($value) || $value instanceof Traversable)
+		{
+			$str = '';
+			foreach($value as $key => $val)
+				$str .= (($str != '') ? ', ': '').$key.' '.$val;
+			
+			$this->_TDbCriteria->order = $str;
+		}
+	}	
+
+	public function __toString()
+	{
+		$str = '';
+		if(strlen((string)$this->getCondition()) > 0)
+			$str .= '"'.(string)$this->getCondition().'"';
+		$params = array();
+		foreach($this->getParameters() as $k=>$v)
+			$params[] = "{$k} => ${v}";
+		if(count($params) > 0)
+			$str .= ', "'.implode(', ',$params).'"';
+		$orders = array();
+		foreach($this->getOrdersBy() as $k=>$v)
+			$orders[] = "{$k} => ${v}";
+		if(count($orders) > 0)
+			$str .= ', "'.implode(', ',$orders).'"';
+		if($this->getLimit() !==null)
+			$str .= ', '.$this->_limit;
+		if($this->getOffset() !== null)
+			$str .= ', '.$this->_offset;
+		return $str;
+	}
+
+	/**
+	 * Returns a property value or an event handler list by property or event name.
+	 * Do not call this method. This is a PHP magic method that we override
+	 * to allow using the following syntax to read a property:
+	 * <code>
+	 * $value=$component->PropertyName;
+	 * </code>
+	 * and to obtain the event handler list for an event,
+	 * <code>
+	 * $eventHandlerList=$component->EventName;
+	 * </code>
+	 * @param string the property name or the event name
+	 * @return mixed the property value or the event handler list
+	 * @throws TInvalidOperationException if the property/event is not defined.
+	 */
+	public function __get($name)
+	{
+		$getter='get'.$name;
+		if(method_exists($this,$getter))
+		{
+			// getting a property
+			return $this->$getter();
+		}
+		else if(strncasecmp($name,'on',2)===0 && method_exists($this,$name))
+		{
+			// getting an event (handler list)
+			$name=strtolower($name);
+			if(!isset($this->_e[$name]))
+				$this->_e[$name]=new TList;
+			return $this->_e[$name];
+		}
+		else
+		{
+			throw new TInvalidOperationException('component_property_undefined',get_class($this),$name);
+		}
+	}
+
+	/**
+	 * Sets value of a component property.
+	 * Do not call this method. This is a PHP magic method that we override
+	 * to allow using the following syntax to set a property or attach an event handler.
+	 * <code>
+	 * $this->PropertyName=$value;
+	 * $this->EventName=$handler;
+	 * </code>
+	 * @param string the property name or event name
+	 * @param mixed the property value or event handler
+	 * @throws TInvalidOperationException If the property is not defined or read-only.
+	 */
+	public function __set($name,$value)
+	{
+		$setter='set'.$name;
+		if(method_exists($this,$setter))
+		{
+			$this->$setter($value);
+		}
+		else if(strncasecmp($name,'on',2)===0 && method_exists($this,$name))
+		{
+			$this->attachEventHandler($name,$value);
+		}
+		else if(method_exists($this,'get'.$name))
+		{
+			throw new TInvalidOperationException('component_property_readonly',get_class($this),$name);
+		}
+		else
+		{
+			throw new TInvalidOperationException('component_property_undefined',get_class($this),$name);
+		}
+	}
+
+}
+
+class TActiveRecordCriteria extends TSqlCriteria
+{
+	
+}
-- 
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