没有命名空间的类 yii yii\base yii\behaviors yii\caching yii\captcha yii\console yii\console\controllers yii\console\widgets yii\data yii\db yii\db\conditions yii\db\cubrid yii\db\cubrid\conditions yii\db\mssql yii\db\mssql\conditions yii\db\mysql yii\db\oci yii\db\oci\conditions yii\db\pgsql yii\db\sqlite yii\db\sqlite\conditions yii\di yii\filters yii\filters\auth yii\grid yii\helpers yii\i18n yii\log yii\mail yii\mutex yii\rbac yii\rest yii\test yii\validators yii\web yii\widgets

Class yii\caching\DbDependency

继承yii\caching\DbDependency » yii\caching\Dependency » yii\base\BaseObject
实现yii\base\Configurable
可用版本自2.0
源码 https://github.com/yiichina/yii2/blob/api/framework/caching/DbDependency.php

DbDependency represents a dependency based on the query result of a SQL statement.

If the query result changes, the dependency is considered as changed. The query is specified via the $sql property.

For more details and usage information on Cache, see the guide article on caching.

公共属性

隐藏继承的属性

属性类型描述被定义在
$data mixed The dependency data that is saved in cache and later is compared with the latest dependency data. yii\caching\Dependency
$db string The application component ID of the DB connection. yii\caching\DbDependency
$params array The parameters (name => value) to be bound to the SQL statement specified by $sql. yii\caching\DbDependency
$reusable boolean Whether this dependency is reusable or not. yii\caching\Dependency
$sql string The SQL query whose result is used to determine if the dependency has been changed. yii\caching\DbDependency

公共方法

隐藏继承的方法

方法描述被定义在
__call() Calls the named method which is not a class method. yii\base\BaseObject
__construct() Constructor. 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() Returns the fully qualified name of this class. yii\base\BaseObject
evaluateDependency() Evaluates the dependency by generating and saving the data related with dependency. yii\caching\Dependency
getHasChanged() Returns a value indicating whether the dependency has changed. yii\caching\Dependency
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
isChanged() Checks whether the dependency is changed. yii\caching\Dependency
resetReusableData() Resets all cached data for reusable dependencies. yii\caching\Dependency

受保护的方法

隐藏继承的方法

方法描述被定义在
generateDependencyData() Generates the data needed to determine if dependency has been changed. yii\caching\DbDependency
generateReusableHash() Generates a unique hash that can be used for retrieving reusable dependency data. yii\caching\Dependency

属性详情

$db public 属性

The application component ID of the DB connection.

public string $db 'db'
$params public 属性

The parameters (name => value) to be bound to the SQL statement specified by $sql.

public array $params = []
$sql public 属性

The SQL query whose result is used to determine if the dependency has been changed. Only the first row of the query result will be used.

public string $sql null

方法详情

generateDependencyData() protected 方法

Generates the data needed to determine if dependency has been changed.

This method returns the value of the global state.

protected mixed generateDependencyData ( $cache )
$cache yii\caching\CacheInterface

The cache component that is currently evaluating this dependency

return mixed

The data needed to determine if dependency has been changed.

throws yii\base\InvalidConfigException

if $db is not a valid application component ID