CDbExpression
| 包 | system.db.schema |
|---|---|
| 继承 | class CDbExpression » CComponent |
| 可用自 | 1.0.2 |
| 版本 | $Id$ |
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.
公共方法
| 方法 | 描述 | 被定义在 |
|---|---|---|
| __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 |
| 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 |
属性详情
expression
属性
public string $expression;
the DB expression
方法详情
__construct()
方法
|
public void __construct(string $expression)
| ||
| $expression | string | the DB expression |
Constructor.
__toString()
方法
|
public string __toString()
| ||
| {return} | string | the DB expression |
String magic method