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CDbCacheDependency

Package system.caching.dependencies
Inheritance class CDbCacheDependency » CCacheDependency » CComponent
Implements ICacheDependency
Since 1.0
Version $Id: CDbCacheDependency.php 1276 2009-07-23 20:19:07Z qiang.xue $
CDbCacheDependency represents a dependency based on the query result of a SQL statement.

If the query result (a scalar) changes, the dependency is considered as changed. To specify the SQL statement, set sql property. The connectionID property specifies the ID of a CDbConnection application component. It is this DB connection that is used to perform the query.

Public Properties

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PropertyTypeDescriptionDefined By
connectionID string the ID of a CDbConnection application component. CDbCacheDependency
dependentData mixed the data used to determine if dependency has been changed. CCacheDependency
hasChanged boolean whether the dependency has changed. CCacheDependency
sql string the SQL statement whose result is used to determine if the dependency has been changed. CDbCacheDependency

Protected Properties

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PropertyTypeDescriptionDefined By
dbConnection CDbConnection the DB connection instance CDbCacheDependency

Public Methods

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MethodDescriptionDefined By
__call() Calls the named method which is not a class method. CComponent
__construct() Constructor. CDbCacheDependency
__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
__sleep() PHP sleep magic method. CDbCacheDependency
__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
evaluateDependency() Evaluates the dependency by generating and saving the data related with dependency. CCacheDependency
getDependentData() CCacheDependency
getEventHandlers() Returns the list of attached event handlers for an event. CComponent
getHasChanged() CCacheDependency
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

Protected Methods

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MethodDescriptionDefined By
generateDependentData() Generates the data needed to determine if dependency has been changed. CDbCacheDependency
getDbConnection() CDbCacheDependency

Property Details

connectionID property
public string $connectionID;

the ID of a CDbConnection application component. Defaults to 'db'.

dbConnection property read-only

the DB connection instance

sql property
public string $sql;

the SQL statement whose result is used to determine if the dependency has been changed. Note, the SQL statement should return back a single value.

Method Details

__construct() method
public void __construct(string $sql=NULL)
$sql string the SQL statement whose result is used to determine if the dependency has been changed.

Constructor.

__sleep() method
public void __sleep()

PHP sleep magic method. This method ensures that the database instance is set null because it contains resource handles.

generateDependentData() method
protected mixed generateDependentData()
{return} mixed the data needed to determine if dependency has been changed.

Generates the data needed to determine if dependency has been changed. This method returns the value of the global state.

getDbConnection() method
protected CDbConnection getDbConnection()
{return} CDbConnection the DB connection instance

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