Constraint

API reference › yii › db › Constraint

class	`yii\db\Constraint`
Extends	`yii\base\BaseObject`
Implements	`yii\base\Configurable`
Since	2.0.13
Source	`framework/db/Constraint.php`

4 subclasses

Constraint represents the metadata of a table constraint.

Properties

Property	Type	Description	Defined by
`$columnNames`	`string[]\|null`	List of column names the constraint belongs to. Default: `null`.	`Constraint`
`$name`	`string\|null`	The constraint name. Default: `null`.	`Constraint`

Methods

Method	Description	Defined by
`__construct()`	Constructor.	`yii\base\BaseObject`
`__call()`	Calls the named method which is not a class method.	`yii\base\BaseObject`
`__get()`	Returns the value of an object property.	`yii\base\BaseObject`
`__isset()`	Checks if a property is set, i.e. defined and not null.	`yii\base\BaseObject`
`__set()`	Sets value of an object property.	`yii\base\BaseObject`
`__unset()`	Sets an object property to null.	`yii\base\BaseObject`
`canGetProperty()`	Returns a value indicating whether a property can be read.	`yii\base\BaseObject`
`canSetProperty()`	Returns a value indicating whether a property can be set.	`yii\base\BaseObject`
`className()` static	Returns the fully qualified name of this class.	`yii\base\BaseObject`
`hasMethod()`	Returns a value indicating whether a method is defined.	`yii\base\BaseObject`
`hasProperty()`	Returns a value indicating whether a property is defined.	`yii\base\BaseObject`
`init()`	Initializes the object.	`yii\base\BaseObject`