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61 lines
1.4 KiB
61 lines
1.4 KiB
13 years ago
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<?php
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/**
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* Expression class file.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @link http://www.yiiframework.com/
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* @copyright Copyright © 2008-2012 Yii Software LLC
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* @license http://www.yiiframework.com/license/
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*/
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namespace yii\db\dao;
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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
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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 = array();
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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 $params parameters
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*/
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public function __construct($expression, $params = array())
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{
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$this->expression = $expression;
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$this->params = $params;
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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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