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72 lines
2.0 KiB
72 lines
2.0 KiB
<?php |
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/** |
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* @link http://www.yiiframework.com/ |
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* @copyright Copyright (c) 2008 Yii Software LLC |
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* @license http://www.yiiframework.com/license/ |
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*/ |
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namespace yii\caching; |
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use Yii; |
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use yii\base\InvalidConfigException; |
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use yii\db\Connection; |
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/** |
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* DbDependency represents a dependency based on the query result of a SQL statement. |
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* |
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* If the query result changes, the dependency is considered as changed. |
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* The query is specified via the [[sql]] property. |
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* |
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* @author Qiang Xue <qiang.xue@gmail.com> |
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* @since 2.0 |
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*/ |
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class DbDependency extends Dependency |
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{ |
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/** |
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* @var string the application component ID of the DB connection. |
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*/ |
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public $db = 'db'; |
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/** |
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* @var string the SQL query whose result is used to determine if the dependency has been changed. |
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* Only the first row of the query result will be used. This property must be always set, otherwise |
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* an exception would be raised. |
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*/ |
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public $sql; |
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/** |
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* @var array the parameters (name=>value) to be bound to the SQL statement specified by [[sql]]. |
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*/ |
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public $params = array(); |
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/** |
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* Initializes the database dependency object. |
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*/ |
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public function init() |
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{ |
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if ($this->sql === null) { |
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throw new InvalidConfigException('DbDependency::sql must be set.'); |
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} |
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} |
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/** |
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* Generates the data needed to determine if dependency has been changed. |
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* This method returns the value of the global state. |
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* @return mixed the data needed to determine if dependency has been changed. |
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*/ |
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protected function generateDependencyData() |
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{ |
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$db = Yii::$app->getComponent($this->db); |
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if (!$db instanceof Connection) { |
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throw new InvalidConfigException("DbDependency::db must be the application component ID of a DB connection."); |
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} |
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if ($db->enableQueryCache) { |
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// temporarily disable and re-enable query caching |
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$db->enableQueryCache = false; |
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$result = $db->createCommand($this->sql, $this->params)->queryRow(); |
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$db->enableQueryCache = true; |
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} else { |
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$result = $db->createCommand($this->sql, $this->params)->queryRow(); |
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} |
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return $result; |
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} |
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}
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