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updated docs about Expression class

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fixes #10647
This commit is contained in:
Carsten Brandt
2016-01-27 15:33:01 +01:00
parent cb7d290416
commit c3240525df
1 changed files with 6 additions and 1 deletions
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7
framework/db/Expression.php
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@ -9,15 +9,20 @@ namespace yii\db;
/** /**
* Expression represents a DB expression that does not need escaping or quoting. * Expression represents a DB expression that does not need escaping or quoting.
*
* When an Expression object is embedded within a SQL statement or fragment, * When an Expression object is embedded within a SQL statement or fragment,
* it will be replaced with the [[expression]] property value without any * it will be replaced with the [[expression]] property value without any
* DB escaping or quoting. For example, * DB escaping or quoting. For example,
* *
* ```php * ```php
* $expression = new Expression('NOW()'); * $expression = new Expression('NOW()');
* $sql = 'SELECT ' . $expression; // SELECT NOW() * $now = (new \yii\db\Query)->select($expression)->scalar(); // SELECT NOW();
* echo $now; // prints the current date
* ``` * ```
* *
* Expression objects are mainly created for passing raw SQL expressions to methods of
* [[Query]], [[ActiveQuery]], and related classes.
*
* An expression can also be bound with parameters specified via [[params]]. * An expression can also be bound with parameters specified via [[params]].
* *
* @author Qiang Xue <qiang.xue@gmail.com> * @author Qiang Xue <qiang.xue@gmail.com>