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60 lines
1.5 KiB
60 lines
1.5 KiB
<?php |
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/** |
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* @link http://www.yiiframework.com/ |
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* @copyright Copyright (c) 2008 Yii Software LLC |
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* @license http://www.yiiframework.com/license/ |
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*/ |
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namespace yii\db; |
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/** |
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* Expression represents a DB expression that does not need escaping or quoting. |
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* When an Expression object is embedded within a SQL statement or fragment, |
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* it will be replaced with the [[expression]] property value without any |
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* DB escaping or quoting. For example, |
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* |
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* ~~~ |
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* $expression = new Expression('NOW()'); |
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* $sql = 'SELECT ' . $expression; // SELECT NOW() |
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* ~~~ |
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* |
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* An expression can also be bound with parameters specified via [[params]]. |
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* |
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* @author Qiang Xue <qiang.xue@gmail.com> |
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* @since 2.0 |
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*/ |
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class Expression extends \yii\base\Object |
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{ |
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/** |
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* @var string the DB expression |
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*/ |
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public $expression; |
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/** |
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* @var array list of parameters that should be bound for this expression. |
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* The keys are placeholders appearing in [[expression]] and the values |
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* are the corresponding parameter values. |
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*/ |
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public $params = []; |
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/** |
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* Constructor. |
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* @param string $expression the DB expression |
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* @param array $params parameters |
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* @param array $config name-value pairs that will be used to initialize the object properties |
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*/ |
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public function __construct($expression, $params = [], $config = []) |
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{ |
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$this->expression = $expression; |
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$this->params = $params; |
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parent::__construct($config); |
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} |
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/** |
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* String magic method |
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* @return string the DB expression |
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*/ |
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public function __toString() |
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{ |
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return $this->expression; |
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} |
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}
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