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CDbExpression

Package	system.db.schema
Inheritance	class CDbExpression » CComponent
Source Code	framework/db/schema/CDbExpression.php

CDbExpression represents a DB expression that does not need escaping. CDbExpression is mainly used in CActiveRecord as attribute values. When inserting or updating a CActiveRecord, attribute values of type CDbExpression will be directly put into the corresponding SQL statement without escaping. A typical usage is that an attribute is set with 'NOW()' expression so that saving the record would fill the corresponding column with the current DB server timestamp.

Starting from version 1.1.1, one can also specify parameters to be bound for the expression. For example, if the expression is 'LOWER(:value)', then one can set params to be array(':value'=>$value).

Public Properties

Hide inherited properties

Property	Type	Description	Defined By
expression	string	the DB expression	CDbExpression
params	array	list of parameters that should be bound for this expression.	CDbExpression

Public Methods

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Method	Description	Defined By
__call()	Calls the named method which is not a class method.	CComponent
__construct()	Constructor.	CDbExpression
__get()	Returns a property value, an event handler list or a behavior based on its name.	CComponent
__isset()	Checks if a property value is null.	CComponent
__set()	Sets value of a component property.	CComponent
__toString()	String magic method	CDbExpression
__unset()	Sets a component property to be null.	CComponent
asa()	Returns the named behavior object.	CComponent
attachBehavior()	Attaches a behavior to this component.	CComponent
attachBehaviors()	Attaches a list of behaviors to the component.	CComponent
attachEventHandler()	Attaches an event handler to an event.	CComponent
canGetProperty()	Determines whether a property can be read.	CComponent
canSetProperty()	Determines whether a property can be set.	CComponent
detachBehavior()	Detaches a behavior from the component.	CComponent
detachBehaviors()	Detaches all behaviors from the component.	CComponent
detachEventHandler()	Detaches an existing event handler.	CComponent
disableBehavior()	Disables an attached behavior.	CComponent
disableBehaviors()	Disables all behaviors attached to this component.	CComponent
enableBehavior()	Enables an attached behavior.	CComponent
enableBehaviors()	Enables all behaviors attached to this component.	CComponent
evaluateExpression()	Evaluates a PHP expression or callback under the context of this component.	CComponent
getEventHandlers()	Returns the list of attached event handlers for an event.	CComponent
hasEvent()	Determines whether an event is defined.	CComponent
hasEventHandler()	Checks whether the named event has attached handlers.	CComponent
hasProperty()	Determines whether a property is defined.	CComponent
raiseEvent()	Raises an event.	CComponent

Property Details

expression property

public string $expression;

the DB expression

params property (available since v1.1.1)

public array $params;

list of parameters that should be bound for this expression. The keys are placeholders appearing in expression, while the values are the corresponding parameter values.

Method Details

__construct() method

public void __construct(string $expression, array $params=array ( ))
$expression	string	the DB expression
$params	array	parameters

Source Code: framework/db/schema/CDbExpression.php#46 (show)


public function __construct($expression,$params=array())
{
    $this->expression=$expression;
    $this->params=$params;
}

Constructor.

__toString() method

public string __toString()
{return}	string	the DB expression

Source Code: framework/db/schema/CDbExpression.php#56 (show)


public function __toString()
{
    return $this->expression;
}

String magic method