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<?php
/**
* TDbCriteria class file.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @link http://www.yiiframework.com/
* @copyright Copyright © 2008-2009 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
/**
* TDbCriteria represents a query criteria, such as conditions, ordering by, limit/offset.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @version $Id$
* @package system.db.schema
* @since 1.0
*/
class TDbCriteria
{
/**
* @var mixed the columns being selected. This refers to the SELECT clause in an SQL
* statement. The property can be either a string (column names separated by commas)
* or an array of column names. Defaults to '*', meaning all columns.
*/
public $select='*';
/**
* @var string query condition. This refers to the WHERE clause in an SQL statement.
* For example, <code>age>31 AND team=1</code>.
*/
public $condition='';
/**
* @var array list of query parameter values indexed by parameter placeholders.
* For example, <code>array(':name'=>'Dan', ':age'=>31)</code>.
*/
public $params=array();
/**
* @var integer maximum number of records to be returned. If less than 0, it means no limit.
*/
public $limit=-1;
/**
* @var integer zero-based offset from where the records are to be returned. If less than 0, it means starting from the beginning.
*/
public $offset=-1;
/**
* @var string how to sort the query results. This refers to the ORDER BY clause in an SQL statement.
*/
public $order='';
/**
* @var string how to group the query results. This refers to the GROUP BY clause in an SQL statement.
* For example, <code>'projectID, teamID'</code>.
*/
public $group='';
/**
* @var string how to join with other tables. This refers to the JOIN clause in an SQL statement.
* For example, <code>'LEFT JOIN users ON users.id=authorID'</code>.
*/
public $join='';
/**
* @var string the condition to be applied with GROUP-BY clause.
* For example, <code>'SUM(revenue)<50000'</code>.
* @since 1.0.1
*/
public $having='';
/**
* Constructor.
* @param array criteria initial property values (indexed by property name)
*/
public function __construct($data=array())
{
foreach($data as $name=>$value)
$this->$name=$value;
}
/**
* Merges with another criteria.
* In general, the merging makes the resulting criteria more restrictive.
* For example, if both criterias have conditions, they will be 'AND' together.
* Also, the criteria passed as the parameter takes precedence in case
* two options cannot be merged (e.g. LIMIT, OFFSET).
* @param TDbCriteria the criteria to be merged with.
* @param boolean whether to use 'AND' to merge condition and having options.
* If false, 'OR' will be used instead. Defaults to 'AND'. This parameter has been
* available since version 1.0.6.
* @since 1.0.5
*/
public function mergeWith($criteria,$useAnd=true)
{
$and=$useAnd ? 'AND' : 'OR';
if(is_array($criteria))
$criteria=new self($criteria);
if($this->select!==$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($this->condition!==$criteria->condition)
{
if($this->condition==='')
$this->condition=$criteria->condition;
else if($criteria->condition!=='')
$this->condition="({$this->condition}) $and ({$criteria->condition})";
}
if($this->params!==$criteria->params)
$this->params=array_merge($this->params,$criteria->params);
if($criteria->limit>0)
$this->limit=$criteria->limit;
if($criteria->offset>=0)
$this->offset=$criteria->offset;
if($this->order!==$criteria->order)
{
if($this->order==='')
$this->order=$criteria->order;
else if($criteria->order!=='')
$this->order.=', '.$criteria->order;
}
if($this->group!==$criteria->group)
{
if($this->group==='')
$this->group=$criteria->group;
else if($criteria->group!=='')
$this->group.=', '.$criteria->group;
}
if($this->join!==$criteria->join)
{
if($this->join==='')
$this->join=$criteria->join;
else if($criteria->join!=='')
$this->join.=' '.$criteria->join;
}
if($this->having!==$criteria->having)
{
if($this->having==='')
$this->having=$criteria->having;
else if($criteria->having!=='')
$this->having="({$this->having}) $and ({$criteria->having})";
}
}
/**
* @return array the array representation of the criteria
* @since 1.0.6
*/
public function toArray()
{
$result=array();
foreach(array('select', 'condition', 'params', 'limit', 'offset', 'order', 'group', 'join', 'having') as $name)
$result[$name]=$this->$name;
return $result;
}
}
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