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CUniqueValidator.php
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CUniqueValidator.php
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<?php
/**
* CUniqueValidator class file.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @link http://www.yiiframework.com/
* @copyright Copyright © 2008 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
/**
* CUniqueValidator validates that the attribute value is unique in the corresponding database table.
*
* CUniqueValidator can only be used for active record objects.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @version $Id$
* @package system.validators
* @since 1.0
*/
class CUniqueValidator extends CValidator
{
/**
* @var boolean whether the comparison is case sensitive. Defaults to true.
* Note, by setting it to false, you are assuming the attribute type is string.
*/
public $caseSensitive=true;
/**
* @var boolean whether the attribute value can be null or empty. Defaults to true,
* meaning that if the attribute is empty, it is considered valid.
*/
public $allowEmpty=true;
/**
* Validates the attribute of the object.
* If there is any error, the error message is added to the object.
* @param CModel the object being validated
* @param string the attribute being validated
*/
protected function validateAttribute($object,$attribute)
{
$value=$object->$attribute;
if($this->allowEmpty && ($value===null || $value===''))
return;
$columnName=$object->getTableSchema()->getColumn($attribute)->rawName;
if($this->caseSensitive)
$exists=$object->exists("$columnName=:value",array(':value'=>$value));
else
$exists=$object->exists("LOWER($columnName)=LOWER(:value)",array(':value'=>$value));
if($exists)
{
$message=$this->message!==null?$this->message:Yii::t('yii','{attribute} "{value}" has already been taken.');
$this->addError($object,$attribute,$message,array('{value}'=>$value));
}
}
}