/**
* Generates the data needed to determine if dependency has been changed.
* This method returns the value of the global state.
* @param Cache $cache the cache component that is currently evaluating this dependency
* @return mixed the data needed to determine if dependency has been changed.
* @throws InvalidConfigException if [[db]] is not a valid application component ID
*/
protected function generateDependencyData($cache)
{
$db = Instance::ensure($this->db, Connection::className());
if ($this->sql === null) {
throw new InvalidConfigException("DbDependency::sql must be set.");
}
if ($db->enableQueryCache) {
// temporarily disable and re-enable query caching
$db->enableQueryCache = false;
$result = $db->createCommand($this->sql, $this->params)->queryOne();
$db->enableQueryCache = true;
} else {
$result = $db->createCommand($this->sql, $this->params)->queryOne();
}
return $result;
}
/**
* Initializes the migration.
* This method will set [[db]] to be the 'db' application component, if it is `null`.
*/
public function init()
{
parent::init();
$this->db = Instance::ensure($this->db, Connection::className());
$this->db->getSchema()->refresh();
}
/**
* This method is invoked right before an action is to be executed (after all possible filters.)
* It checks the existence of the [[migrationPath]].
* @param \yii\base\Action $action the action to be executed.
* @return boolean whether the action should continue to be executed.
*/
public function beforeAction($action)
{
if (parent::beforeAction($action)) {
if ($action->id !== 'create') {
$this->db = Instance::ensure($this->db, Connection::className());
}
return true;
} else {
return false;
}
}
/**
* Initializes generic database table based mutex implementation.
* @throws InvalidConfigException if [[db]] is invalid.
*/
public function init()
{
parent::init();
$this->db = Instance::ensure($this->db, Connection::className());
}
/**
* Initializes the DB connection component.
* This method will initialize the [[db]] property to make sure it refers to a valid DB connection.
*
* @throws InvalidConfigException if [[db]] is invalid.
*/
public function init()
{
parent::init();
$this->db = Instance::ensure($this->db, Connection::className());
if ($this->sql === null) {
throw new InvalidConfigException('The "sql" property must be set.');
}
}
/**
* Initializes the DbMessageSource component.
* This method will initialize the [[db]] property to make sure it refers to a valid DB connection.
* Configured [[cache]] component would also be initialized.
* @throws InvalidConfigException if [[db]] is invalid or [[cache]] is invalid.
*/
public function init()
{
parent::init();
$this->db = Instance::ensure($this->db, Connection::className());
if ($this->enableCaching) {
$this->cache = Instance::ensure($this->cache, Cache::className());
}
}
