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109 lines
3.6 KiB
PHP
109 lines
3.6 KiB
PHP
<?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\base\InvalidConfigException;
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use yii\db\QueryInterface;
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use yii\di\Instance;
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/**
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* DbQueryDependency represents a dependency based on the query result of an [[QueryInterface]] instance.
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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 [[query]] property.
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*
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* Object of any class which matches [[QueryInterface]] can be used, so this dependency can be used not only
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* with regular relational databases but with MongoDB, Redis and so on as well.
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*
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* For more details and usage information on Cache, see the [guide article on caching](guide:caching-overview).
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*
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* @see QueryInterface
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*
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* @author Paul Klimov <klimov.paul@gmail.com>
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* @since 2.0.12
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*/
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class DbQueryDependency extends Dependency
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{
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/**
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* @var string|array|object the application component ID of the database connection, connection object or
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* its array configuration.
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* This field can be left blank, allowing query to determine connection automatically.
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*/
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public $db;
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/**
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* @var QueryInterface the query which result is used to determine if the dependency has been changed.
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* Actual query method to be invoked is determined by [[method]].
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*/
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public $query;
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/**
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* @var string|callable method which should be invoked in over the [[query]] object.
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*
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* If specified as a string an own query method with such name will be invoked, passing [[db]] value as its
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* first argument. For example: `exists`, `all`.
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*
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* This field can be specified as a PHP callback of following signature:
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*
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* ```php
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* function (QueryInterface $query, mixed $db) {
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* //return mixed;
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* }
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* ```
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*
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* If not set - [[QueryInterface::one()]] will be used.
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*/
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public $method;
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/**
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* Generates the data needed to determine if dependency is changed.
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* This method returns the query result
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* @param Cache $cache the cache component that is currently evaluating this dependency
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* @return mixed the data needed to determine if dependency has been changed.
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* @throws InvalidConfigException on invalid configuration.
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*/
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protected function generateDependencyData($cache)
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{
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$db = $this->db;
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if ($db !== null) {
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$db = Instance::ensure($db);
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}
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if (!$this->query instanceof QueryInterface) {
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throw new InvalidConfigException('"' . get_class($this) . '::$query" should be an instance of "yii\db\QueryInterface".');
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}
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if (!empty($db->enableQueryCache)) {
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// temporarily disable and re-enable query caching
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$originEnableQueryCache = $db->enableQueryCache;
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$db->enableQueryCache = false;
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$result = $this->executeQuery($this->query, $db);
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$db->enableQueryCache = $originEnableQueryCache;
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} else {
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$result = $this->executeQuery($this->query, $db);
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}
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return $result;
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}
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/**
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* Executes the query according to [[method]] specification.
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* @param QueryInterface $query query to be executed.
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* @param mixed $db connection.
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* @return mixed query result.
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*/
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private function executeQuery($query, $db)
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{
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if ($this->method === null) {
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return $query->one($db);
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}
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if (is_string($this->method)) {
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return call_user_func([$query, $this->method], $db);
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}
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return call_user_func($this->method, $query, $db);
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}
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} |