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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

PropertyTypeDescriptionDefined By
expression string the DB expression CDbExpression
params array list of parameters that should be bound for this expression. CDbExpression

Public Methods

Hide inherited methods

MethodDescriptionDefined 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

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