- ActiveRecord Port from Yii ... not perfect but works ^^

5 files changed, 781 insertions, 0 deletions

diff --git a/framework/Db/Schema/mssql/TMssqlColumnSchema.php b/framework/Db/Schema/mssql/TMssqlColumnSchema.php
new file mode 100755
index 00000000..0c5c6ac4
--- /dev/null
+++ b/framework/Db/Schema/mssql/TMssqlColumnSchema.php
@@ -0,0 +1,57 @@
+<?php
+/**
+ * TMssqlColumnSchema class file.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @author Christophe Boulain <Christophe.Boulain@gmail.com>
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright &copy; 2008-2009 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+prado::using('System.Db.Schema.TDbColumnSchema');
+
+/**
+ * TMssqlColumnSchema class describes the column meta data of a MSSQL table.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @author Christophe Boulain <Christophe.Boulain@gmail.com>
+ * @version $Id: TMssqlColumnSchema.php 2679 2009-06-15 07:49:42Z Christophe.Boulain $
+ * @package System.Db.Schema.mssql
+ * @since 1.0.4
+ */
+class TMssqlColumnSchema extends TDbColumnSchema
+{
+	/**
+	 * Extracts the PHP type from DB type.
+	 * @param string DB type
+	 */
+	protected function extractType($dbType)
+	{
+		if(strpos($dbType,'bigint')!==false || strpos($dbType,'float')!==false || strpos($dbType,'real')!==false)
+			$this->type='double';
+		else if(strpos($dbType,'int')!==false || strpos($dbType,'smallint')!==false || strpos($dbType,'tinyint'))
+			$this->type='integer';
+		else if(strpos($dbType,'bit')!==false)
+			$this->type='boolean';
+		else
+			$this->type='string';
+	}
+
+	protected function extractDefault($defaultValue)
+	{
+		if($this->dbType==='timestamp' )
+			$this->defaultValue=null;
+		else
+			parent::extractDefault(str_replace(array('(',')',"'"), '', $defaultValue));
+	}
+
+	/**
+	 * Extracts size, precision and scale information from column's DB type.
+	 * We do nothing here, since sizes and precisions have been computed before.
+	 * @param string the column's DB type
+	 */
+	protected function extractLimit($dbType)
+	{
+	}
+}
diff --git a/framework/Db/Schema/mssql/TMssqlCommandBuilder.php b/framework/Db/Schema/mssql/TMssqlCommandBuilder.php
new file mode 100755
index 00000000..f0b5c7f4
--- /dev/null
+++ b/framework/Db/Schema/mssql/TMssqlCommandBuilder.php
@@ -0,0 +1,303 @@
+<?php
+/**
+ * CMsCommandBuilder class file.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @author Christophe Boulain <Christophe.Boulain@gmail.com>
+ * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright &copy; 2008-2009 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+prado::using ('System.Db.schame.TDbCommandBuilder');
+
+/**
+ * TMssqlCommandBuilder provides basic methods to create query commands for tables for Mssql Servers.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @author Christophe Boulain <Christophe.Boulain@gmail.com>
+ * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
+ * @version $Id: TMssqlCommandBuilder.php 2679 2009-06-15 07:49:42Z Christophe.Boulain $
+ * @package system.db.schema.mssql
+ * @since 1.0.4
+ */
+class TMssqlCommandBuilder extends TDbCommandBuilder
+{
+   	/**
+	 * Returns the last insertion ID for the specified table.
+	 * Override parent implemantation since PDO mssql driver does not provide this method
+	 * @param TDbTableSchema the table metadata
+	 * @return mixed last insertion id. Null is returned if no sequence name.
+	 */
+	public function getLastInsertID($table)
+	{
+		if($table->sequenceName!==null)
+			return $this->getDbConnection()->createCommand('SELECT SCOPE_IDENTITY()')->queryScalar();
+		else
+			return null;
+	}
+
+	/**
+	 * Creates a COUNT(*) command for a single table.
+	 * Override parent implementation to remove the order clause of criteria if it exists
+	 * @param TDbTableSchema the table metadata
+	 * @param TDbCriteria the query criteria
+	 * @return TDbCommand query command.
+	 */
+	public function createCountCommand($table,$criteria)
+	{
+		$criteria->order='';
+		return parent::createCountCommand($table, $criteria);
+	}
+
+	/**
+	 * Creates a SELECT command for a single table.
+	 * Override parent implementation to check if an orderby clause if specified when querying with an offset
+	 * @param TDbTableSchema the table metadata
+	 * @param TDbCriteria the query criteria
+	 * @return TDbCommand query command.
+	 */
+	public function createFindCommand($table,$criteria)
+	{
+		$criteria=$this->checkCriteria($table,$criteria);
+		return parent::createFindCommand($table,$criteria);
+
+	}
+
+	/**
+	 * Creates an UPDATE command.
+	 * Override parent implementation because mssql don't want to update an identity column
+	 * @param TDbTableSchema the table metadata
+	 * @param array list of columns to be updated (name=>value)
+	 * @param TDbCriteria the query criteria
+	 * @return TDbCommand update command.
+	 */
+	public function createUpdateCommand($table,$data,$criteria)
+	{
+		$criteria=$this->checkCriteria($table,$criteria);
+		$fields=array();
+		$values=array();
+		$bindByPosition=isset($criteria->params[0]);
+		foreach($data as $name=>$value)
+		{
+			if(($column=$table->getColumn($name))!==null)
+			{
+				if ($table->sequenceName !== null && $column->isPrimaryKey === true) continue;
+				if($value instanceof TDbExpression)
+					$fields[]=$column->rawName.'='.(string)$value;
+				else if($bindByPosition)
+				{
+					$fields[]=$column->rawName.'=?';
+					$values[]=$column->typecast($value);
+				}
+				else
+				{
+					$fields[]=$column->rawName.'=:'.$name;
+					$values[':'.$name]=$column->typecast($value);
+				}
+			}
+		}
+		if($fields===array())
+			throw new TDbException('No columns are being updated for table "{0}".',
+				$table->name);
+		$sql="UPDATE {$table->rawName} SET ".implode(', ',$fields);
+		$sql=$this->applyJoin($sql,$criteria->join);
+		$sql=$this->applyCondition($sql,$criteria->condition);
+		$sql=$this->applyOrder($sql,$criteria->order);
+		$sql=$this->applyLimit($sql,$criteria->limit,$criteria->offset);
+
+		$command=$this->getDbConnection()->createCommand($sql);
+		$this->bindValues($command,array_merge($values,$criteria->params));
+
+		return $command;
+	}
+
+	/**
+	 * Creates a DELETE command.
+	 * Override parent implementation to check if an orderby clause if specified when querying with an offset
+	 * @param TDbTableSchema the table metadata
+	 * @param TDbCriteria the query criteria
+	 * @return TDbCommand delete command.
+	 */
+	public function createDeleteCommand($table,$criteria)
+	{
+		$criteria=$this->checkCriteria($table, $criteria);
+		return parent::createDeleteCommand($table, $criteria);
+	}
+
+	/**
+	 * Creates an UPDATE command that increments/decrements certain columns.
+	 * Override parent implementation to check if an orderby clause if specified when querying with an offset
+	 * @param TDbTableSchema the table metadata
+	 * @param TDbCriteria the query criteria
+	 * @param array counters to be updated (counter increments/decrements indexed by column names.)
+	 * @return TDbCommand the created command
+	 * @throws CException if no counter is specified
+	 */
+	public function createUpdateCounterCommand($table,$counters,$criteria)
+	{
+		$criteria=$this->checkCriteria($table, $criteria);
+		return parent::createUpdateCounterCommand($table, $counters, $criteria);
+	}
+
+	/**
+	 * This is a port from Prado Framework.
+	 *
+	 * Overrides parent implementation. Alters the sql to apply $limit and $offset.
+	 * The idea for limit with offset is done by modifying the sql on the fly
+	 * with numerous assumptions on the structure of the sql string.
+	 * The modification is done with reference to the notes from
+	 * http://troels.arvin.dk/db/rdbms/#select-limit-offset
+	 *
+	 * <code>
+	 * SELECT * FROM (
+	 *  SELECT TOP n * FROM (
+	 *    SELECT TOP z columns      -- (z=n+skip)
+	 *    FROM tablename
+	 *    ORDER BY key ASC
+	 *  ) AS FOO ORDER BY key DESC -- ('FOO' may be anything)
+	 * ) AS BAR ORDER BY key ASC    -- ('BAR' may be anything)
+	 * </code>
+	 *
+	 * <b>Regular expressions are used to alter the SQL query. The resulting SQL query
+	 * may be malformed for complex queries.</b> The following restrictions apply
+	 *
+	 * <ul>
+	 *   <li>
+	 * In particular, <b>commas</b> should <b>NOT</b>
+	 * be used as part of the ordering expression or identifier. Commas must only be
+	 * used for separating the ordering clauses.
+	 *  </li>
+	 *  <li>
+	 * In the ORDER BY clause, the column name should NOT be be qualified
+	 * with a table name or view name. Alias the column names or use column index.
+	 * </li>
+	 * <li>
+	 * No clauses should follow the ORDER BY clause, e.g. no COMPUTE or FOR clauses.
+	 * </li>
+	 *
+	 * @param string SQL query string.
+	 * @param integer maximum number of rows, -1 to ignore limit.
+	 * @param integer row offset, -1 to ignore offset.
+	 * @return string SQL with limit and offset.
+	 *
+	 * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
+	 */
+	public function applyLimit($sql, $limit, $offset)
+	{
+		$limit = $limit!==null ? intval($limit) : -1;
+		$offset = $offset!==null ? intval($offset) : -1;
+		if ($limit > 0 && $offset <= 0) //just limit
+			$sql = preg_replace('/^([\s(])*SELECT( DISTINCT)?(?!\s*TOP\s*\()/i',"\\1SELECT\\2 TOP $limit", $sql);
+		else if($limit > 0 && $offset > 0)
+			$sql = $this->rewriteLimitOffsetSql($sql, $limit,$offset);
+		return $sql;
+	}
+
+	/**
+	 * Rewrite sql to apply $limit > and $offset > 0 for MSSQL database.
+	 * See http://troels.arvin.dk/db/rdbms/#select-limit-offset
+	 * @param string sql query
+	 * @param integer $limit > 0
+	 * @param integer $offset > 0
+	 * @return sql modified sql query applied with limit and offset.
+	 *
+	 * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
+	 */
+	protected function rewriteLimitOffsetSql($sql, $limit, $offset)
+	{
+		$fetch = $limit+$offset;
+		$sql = preg_replace('/^([\s(])*SELECT( DISTINCT)?(?!\s*TOP\s*\()/i',"\\1SELECT\\2 TOP $fetch", $sql);
+		$ordering = $this->findOrdering($sql);
+
+		$orginalOrdering = $this->joinOrdering($ordering);
+		$reverseOrdering = $this->joinOrdering($this->reverseDirection($ordering));
+		$sql = "SELECT * FROM (SELECT TOP {$limit} * FROM ($sql) as [__inner top table__] {$reverseOrdering}) as [__outer top table__] {$orginalOrdering}";
+		return $sql;
+	}
+
+	/**
+	 * Base on simplified syntax http://msdn2.microsoft.com/en-us/library/aa259187(SQL.80).aspx
+	 *
+	 * @param string $sql
+	 * @return array ordering expression as key and ordering direction as value
+	 *
+	 * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
+	 */
+	protected function findOrdering($sql)
+	{
+		if(!preg_match('/ORDER BY/i', $sql))
+			return array();
+		$matches=array();
+		$ordering=array();
+		preg_match_all('/(ORDER BY)[\s"\[](.*)(ASC|DESC)?(?:[\s"\[]|$|COMPUTE|FOR)/i', $sql, $matches);
+		if(count($matches)>1 && count($matches[2]) > 0)
+		{
+			$parts = explode(',', $matches[2][0]);
+			foreach($parts as $part)
+			{
+				$subs=array();
+				if(preg_match_all('/(.*)[\s"\]](ASC|DESC)$/i', trim($part), $subs))
+				{
+					if(count($subs) > 1 && count($subs[2]) > 0)
+					{
+						$ordering[$subs[1][0]] = $subs[2][0];
+					}
+					//else what?
+				}
+				else
+					$ordering[trim($part)] = 'ASC';
+			}
+		}
+		return $ordering;
+	}
+
+	/**
+	 * @param array ordering obtained from findOrdering()
+	 * @return string concat the orderings
+	 *
+	 * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
+	 */
+	protected function joinOrdering($orders)
+	{
+		if(count($orders)>0)
+		{
+			$str=array();
+			foreach($orders as $column => $direction)
+				$str[] = $column.' '.$direction;
+			return 'ORDER BY '.implode(', ', $str);
+		}
+	}
+
+	/**
+	 * @param array original ordering
+	 * @return array ordering with reversed direction.
+	 *
+	 * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
+	 */
+	protected function reverseDirection($orders)
+	{
+		foreach($orders as $column => $direction)
+			$orders[$column] = strtolower(trim($direction))==='desc' ? 'ASC' : 'DESC';
+		return $orders;
+	}
+
+
+	/**
+	 * Checks if the criteria has an order by clause when using offset/limit.
+	 * Override parent implementation to check if an orderby clause if specified when querying with an offset
+	 * If not, order it by pk.
+	 * @param TMssqlTableSchema table schema
+	 * @param TDbCriteria criteria
+	 * @return TDbCrireria the modified criteria
+	 */
+	protected function checkCriteria($table, $criteria)
+	{
+		if ($criteria->offset > 0 && $criteria->order==='')
+		{
+			$criteria->order=is_array($table->primaryKey)?implode(',',$table->primaryKey):$table->primaryKey;
+		}
+		return $criteria;
+	}
+}
diff --git a/framework/Db/Schema/mssql/TMssqlPdoAdapter.php b/framework/Db/Schema/mssql/TMssqlPdoAdapter.php
new file mode 100755
index 00000000..c9d4597f
--- /dev/null
+++ b/framework/Db/Schema/mssql/TMssqlPdoAdapter.php
@@ -0,0 +1,74 @@
+<?php
+/**
+ * TMssqlPdo class file
+ *
+ * @author Christophe Boulain <Christophe.Boulain@gmail.com>
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright &copy; 2008-2009 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+/**
+ * This is an extension of default PDO class for mssql driver only
+ * It provides some missing functionalities of pdo driver
+ * @author Christophe Boulain <Christophe.Boulain@gmail.com>
+ * @version $Id: TMssqlPdoAdapter.php 2679 2009-06-15 07:49:42Z Christophe.Boulain $
+ * @package system.db.schema.mssql
+ * @since 1.0.4
+ */
+class TMssqlPdoAdapter extends PDO
+{
+	/**
+	 * Get the last inserted id value
+	 * MSSQL doesn't support sequence, so, argument is ignored
+	 *
+	 * @param string sequence name. Defaults to null
+	 * @return int last inserted id
+	 */
+	public function lastInsertId ($sequence=NULL)
+	{
+		return $this->query('SELECT SCOPE_IDENTITY()')->fetchColumn();
+	}
+
+	/**
+	 * Begin a transaction
+	 *
+	 * Is is necessary to override pdo's method, as mssql pdo drivers
+	 * does not support transaction
+	 *
+	 * @return boolean
+	 */
+	public function beginTransaction ()
+	{
+		$this->exec('BEGIN TRANSACTION');
+		return true;
+	}
+
+	/**
+	 * Commit a transaction
+	 *
+	 * Is is necessary to override pdo's method, as mssql pdo drivers
+	 * does not support transaction
+	 *
+	 * @return boolean
+	 */
+	public function commit ()
+	{
+		$this->exec('COMMIT TRANSACTION');
+		return true;
+	}
+
+	/**
+	 * Rollback a transaction
+	 *
+	 * Is is necessary to override pdo's method, ac mssql pdo drivers
+	 * does not support transaction
+	 *
+	 * @return boolean
+	 */
+	public function rollBack ()
+	{
+		$this->exec('ROLLBACK TRANSACTION');
+		return true;
+	}
+}
diff --git a/framework/Db/Schema/mssql/TMssqlSchema.php b/framework/Db/Schema/mssql/TMssqlSchema.php
new file mode 100755
index 00000000..063e8994
--- /dev/null
+++ b/framework/Db/Schema/mssql/TMssqlSchema.php
@@ -0,0 +1,312 @@
+<?php
+/**
+ * TMssqlSchema class file.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @author Christophe Boulain <Christophe.Boulain@gmail.com>
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright &copy; 2008-2009 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+prado::using('System.Db.Schema.TDbSchema');
+
+/**
+ * TMssqlSchema is the class for retrieving metadata information from a MS SQL Server database.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @author Christophe Boulain <Christophe.Boulain@gmail.com>
+ * @version $Id: TMssqlSchema.php 2679 2009-06-15 07:49:42Z Christophe.Boulain $
+ * @package System.Db.Schema.mssql
+ * @since 1.0.4
+ */
+class TMssqlSchema extends TDbSchema
+{
+	const DEFAULT_SCHEMA='dbo';
+
+
+	/**
+	 * Quotes a table name for use in a query.
+	 * @param string table name
+	 * @return string the properly quoted table name
+	 */
+	public function quoteTableName($name)
+	{
+		if (strpos($name,'.')===false)
+			return '['.$name.']';
+		$names=explode('.',$name);
+		foreach ($names as &$n)
+			$n = '['.$n.']';
+		return implode('.',$names);
+	}
+
+	/**
+	 * Quotes a column name for use in a query.
+	 * @param string column name
+	 * @return string the properly quoted column name
+	 */
+	public function quoteColumnName($name)
+	{
+		return '['.$name.']';
+	}
+
+	/**
+	 * Compares two table names.
+	 * The table names can be either quoted or unquoted. This method
+	 * will consider both cases.
+	 * @param string table name 1
+	 * @param string table name 2
+	 * @return boolean whether the two table names refer to the same table.
+	 */
+	public function compareTableNames($name1,$name2)
+	{
+		$name1=str_replace(array('[',']'),'',$name1);
+		$name1=str_replace(array('[',']'),'',$name2);
+		return parent::compareTableNames(strtolower($name1),strtolower($name2));
+	}
+
+	/**
+	 * Creates a table instance representing the metadata for the named table.
+	 * @return CMysqlTableSchema driver dependent table metadata. Null if the table does not exist.
+	 */
+	protected function createTable($name)
+	{
+		$table=new TMssqlTableSchema;
+		$this->resolveTableNames($table,$name);
+		//if (!in_array($table->name, $this->tableNames)) return null;
+		$table->primaryKey=$this->findPrimaryKey($table);
+		$table->foreignKeys=$this->findForeignKeys($table);
+		if($this->findColumns($table))
+		{
+			return $table;
+		}
+		else
+			return null;
+	}
+
+	/**
+	 * Generates various kinds of table names.
+	 * @param CMysqlTableSchema the table instance
+	 * @param string the unquoted table name
+	 */
+	protected function resolveTableNames($table,$name)
+	{
+		$parts=explode('.',str_replace(array('[',']'),'',$name));
+		if(($c=count($parts))==3)
+		{
+			// Catalog name, schema name and table name provided
+			$table->catalogName=$parts[0];
+			$table->schemaName=$parts[1];
+			$table->name=$parts[2];
+			$table->rawName=$this->quoteTableName($table->catalogName).'.'.$this->quoteTableName($table->schemaName).'.'.$this->quoteTableName($table->name);
+		}
+		elseif ($c==2)
+		{
+			// Only schema name and table name provided
+			$table->name=$parts[1];
+			$table->schemaName=$parts[0];
+			$table->rawName=$this->quoteTableName($table->schemaName).'.'.$this->quoteTableName($table->name);
+		}
+		else
+		{
+			// Only the name given, we need to get at least the schema name
+			//if (empty($this->_schemaNames)) $this->findTableNames();
+			$table->name=$parts[0];
+			$table->schemaName=self::DEFAULT_SCHEMA;
+			$table->rawName=$this->quoteTableName($table->schemaName).'.'.$this->quoteTableName($table->name);
+		}
+	}
+
+	/**
+	 * Gets the primary key column(s) details for the given table.
+	 * @param TMssqlTableSchema table
+	 * @return mixed primary keys (null if no pk, string if only 1 column pk, or array if composite pk)
+	 */
+	protected function findPrimaryKey($table)
+	{
+		$kcu='INFORMATION_SCHEMA.KEY_COLUMN_USAGE';
+		$tc='INFORMATION_SCHEMA.TABLE_CONSTRAINTS';
+		if (isset($table->catalogName))
+		{
+			$kcu=$table->catalogName.'.'.$kcu;
+			$tc=$table->catalogName.'.'.$tc;
+		}
+
+		$sql = <<<EOD
+		SELECT k.column_name field_name
+			FROM {$this->quoteTableName($kcu)} k
+		    LEFT JOIN {$this->quoteTableName($tc)} c
+		      ON k.table_name = c.table_name
+		     AND k.constraint_name = c.constraint_name
+		   WHERE c.constraint_type ='PRIMARY KEY'
+		   	    AND k.table_name = :table
+				AND k.table_schema = :schema
+EOD;
+		$command = $this->getDbConnection()->createCommand($sql);
+		$command->bindValue(':table', $table->name);
+		$command->bindValue(':schema', $table->schemaName);
+		$primary=$command->queryColumn();
+		switch (count($primary))
+		{
+			case 0: // No primary key on table
+				$primary=null;
+				break;
+			case 1: // Only 1 primary key
+				$primary=$primary[0];
+				break;
+		}
+		return $primary;
+	}
+
+	/**
+	 * Gets foreign relationship constraint keys and table name
+	 * @param TMssqlTableSchema table
+	 * @return array foreign relationship table name and keys.
+	 */
+	protected function findForeignKeys($table)
+	{
+		$rc='INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS';
+		$kcu='INFORMATION_SCHEMA.KEY_COLUMN_USAGE';
+		if (isset($table->catalogName))
+		{
+			$kcu=$table->catalogName.'.'.$kcu;
+			$rc=$table->catalogName.'.'.$rc;
+		}
+
+		//From http://msdn2.microsoft.com/en-us/library/aa175805(SQL.80).aspx
+		$sql = <<<EOD
+		SELECT
+		     KCU1.CONSTRAINT_NAME AS 'FK_CONSTRAINT_NAME'
+		   , KCU1.TABLE_NAME AS 'FK_TABLE_NAME'
+		   , KCU1.COLUMN_NAME AS 'FK_COLUMN_NAME'
+		   , KCU1.ORDINAL_POSITION AS 'FK_ORDINAL_POSITION'
+		   , KCU2.CONSTRAINT_NAME AS 'UQ_CONSTRAINT_NAME'
+		   , KCU2.TABLE_NAME AS 'UQ_TABLE_NAME'
+		   , KCU2.COLUMN_NAME AS 'UQ_COLUMN_NAME'
+		   , KCU2.ORDINAL_POSITION AS 'UQ_ORDINAL_POSITION'
+		FROM {$this->quoteTableName($rc)} RC
+		JOIN {$this->quoteTableName($kcu)} KCU1
+		ON KCU1.CONSTRAINT_CATALOG = RC.CONSTRAINT_CATALOG
+		   AND KCU1.CONSTRAINT_SCHEMA = RC.CONSTRAINT_SCHEMA
+		   AND KCU1.CONSTRAINT_NAME = RC.CONSTRAINT_NAME
+		JOIN {$this->quoteTableName($kcu)} KCU2
+		ON KCU2.CONSTRAINT_CATALOG =
+		RC.UNIQUE_CONSTRAINT_CATALOG
+		   AND KCU2.CONSTRAINT_SCHEMA =
+		RC.UNIQUE_CONSTRAINT_SCHEMA
+		   AND KCU2.CONSTRAINT_NAME =
+		RC.UNIQUE_CONSTRAINT_NAME
+		   AND KCU2.ORDINAL_POSITION = KCU1.ORDINAL_POSITION
+		WHERE KCU1.TABLE_NAME = :table
+EOD;
+		$command = $this->getDbConnection()->createCommand($sql);
+		$command->bindValue(':table', $table->name);
+		$fkeys=array();
+		foreach($command->queryAll() as $info)
+		{
+			$fkeys[$info['FK_COLUMN_NAME']]=array($info['UQ_TABLE_NAME'],$info['UQ_COLUMN_NAME'],);
+
+		}
+		return $fkeys;
+	}
+
+
+	/**
+	 * Collects the table column metadata.
+	 * @param CMysqlTableSchema the table metadata
+	 * @return boolean whether the table exists in the database
+	 */
+	protected function findColumns($table)
+	{
+		$where=array();
+		$where[]="TABLE_NAME='".$table->name."'";
+		if (isset($table->catalogName))
+			$where[]="TABLE_CATALOG='".$table->catalogName."'";
+		if (isset($table->schemaName))
+			$where[]="TABLE_SCHEMA='".$table->schemaName."'";
+		$sql="SELECT *, columnproperty(object_id(table_schema+'.'+table_name), column_name, 'IsIdentity') as IsIdentity ".
+			 "FROM INFORMATION_SCHEMA.COLUMNS WHERE ".join(' AND ',$where);
+		if (($columns=$this->getDbConnection()->createCommand($sql)->queryAll())===array())
+			return false;
+
+		foreach($columns as $column)
+		{
+			$c=$this->createColumn($column);
+			if (is_array($table->primaryKey))
+				$c->isPrimaryKey=in_array($c->name, $table->primaryKey);
+			else
+				$c->isPrimaryKey=strcasecmp($c->name,$table->primaryKey)===0;
+
+			$c->isForeignKey=isset($table->foreignKeys[$c->name]);
+			$table->columns[$c->name]=$c;
+			if ($column['IsIdentity']==1 && $table->sequenceName===null)
+				$table->sequenceName='';
+
+		}
+		return true;
+	}
+
+	/**
+	 * Creates a table column.
+	 * @param array column metadata
+	 * @return TDbColumnSchema normalized column metadata
+	 */
+	protected function createColumn($column)
+	{
+		$c=new TMssqlColumnSchema;
+		$c->name=$column['COLUMN_NAME'];
+		$c->rawName=$this->quoteColumnName($c->name);
+		$c->allowNull=$column['IS_NULLABLE']=='YES';
+		if ($column['NUMERIC_PRECISION_RADIX']!==null)
+		{
+			// We have a numeric datatype
+			$c->size=$c->precision=$column['NUMERIC_PRECISION']!==null?(int)$column['NUMERIC_PRECISION']:null;
+			$c->scale=$column['NUMERIC_SCALE']!==null?(int)$column['NUMERIC_SCALE']:null;
+		}
+		elseif ($column['DATA_TYPE']=='image' || $column['DATA_TYPE']=='text')
+			$c->size=$c->precision=null;
+		else
+			$c->size=$c->precision=($column['CHARACTER_MAXIMUM_LENGTH']!== null)?(int)$column['CHARACTER_MAXIMUM_LENGTH']:null;
+
+		$c->init($column['DATA_TYPE'],$column['COLUMN_DEFAULT']);
+		return $c;
+	}
+
+	/**
+	 * Returns all table names in the database.
+	 * @return array all table names in the database.
+	 * @since 1.0.4
+	 */
+	protected function findTableNames($schema='')
+	{
+		if($schema==='')
+			$schema=self::DEFAULT_SCHEMA;
+		$sql=<<<EOD
+SELECT TABLE_NAME, TABLE_SCHEMA FROM [INFORMATION_SCHEMA].[TABLES]
+WHERE TABLE_TYPE='BASE TABLE' AND TABLE_SCHEMA=:schema
+EOD;
+		$command=$this->getDbConnection()->createCommand($sql);
+		$command->bindParam(":schema", $schema);
+		$rows=$command->queryAll();
+		$names=array();
+		foreach ($rows as $row)
+		{
+			if ($schema == self::DEFAULT_SCHEMA)
+				$names[]=$row['TABLE_NAME'];
+			else
+				$names[]=$schema.'.'.$row['TABLE_SCHEMA'].'.'.$row['TABLE_NAME'];
+		}
+
+		return $names;
+	}
+
+	/**
+	 * Creates a command builder for the database.
+	 * This method overrides parent implementation in order to create a MSSQL specific command builder
+	 * @return TDbCommandBuilder command builder instance
+	 */
+	protected function createCommandBuilder()
+	{
+		return new TMssqlCommandBuilder($this);
+	}
+}
diff --git a/framework/Db/Schema/mssql/TMssqlTableSchema.php b/framework/Db/Schema/mssql/TMssqlTableSchema.php
new file mode 100755
index 00000000..ed1b7c8a
--- /dev/null
+++ b/framework/Db/Schema/mssql/TMssqlTableSchema.php
@@ -0,0 +1,35 @@
+<?php
+/**
+ * TMssqlTableSchema class file.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @author Christophe Boulain <Christophe.Boulain@gmail.com>
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright &copy; 2008-2009 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+prado::using('System.Db.TDbTableSchema');
+
+/**
+ * TMssqlTableSchema represents the metadata for a MSSQL table.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @author Christophe Boulain <Christophe.Boulain@gmail.com>
+ * @version $Id: TMssqlTableSchema.php 2679 2009-06-15 07:49:42Z Christophe.Boulain $
+ * @package system.Db.schema.mssql
+ * @since 1.0.4
+ */
+class TMssqlTableSchema extends TDbTableSchema
+{
+	/**
+	 * @var string name of the catalog (database) that this table belongs to.
+	 * Defaults to null, meaning no schema (or the current database).
+	 */
+	public $catalogName;
+	/**
+	 * @var string name of the schema that this table belongs to.
+	 * Defaults to null, meaning no schema (or the current database owner).
+	 */
+	public $schemaName;
+}