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67 lines
1.9 KiB
PHP
67 lines
1.9 KiB
PHP
<?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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*
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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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* ```php
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* $expression = new Expression('NOW()');
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* $now = (new \yii\db\Query)->select($expression)->scalar(); // SELECT NOW();
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* echo $now; // prints the current date
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* ```
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*
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* Expression objects are mainly created for passing raw SQL expressions to methods of
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* [[Query]], [[ActiveQuery]], and related classes.
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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\BaseObject implements ExpressionInterface
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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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