/**
* 初始化DbSession组件。
* 该方法会初始化db属性，以确保它是一个合法的数据库连接。
* @throws \Exception 如果{@link db}非法
*/
public function init()
{
if (is_string($this->db)) {
$this->db = Sky::$app->getComponent($this->db);
}
if (!$this->db instanceof ConnectionPool) {
throw new \Exception("DbSession::db must be either a DB connection instance or the application component ID of a DB connection.");
}
parent::init();
}
/**
* 初始化
*/
public function init()
{
if (is_string($this->cache)) {
$this->cache = Sky::$app->getComponent($this->cache);
}
if (!$this->cache instanceof Cache) {
throw new \Exception('CacheSession::cache must refer to the application component ID of a cache object.');
}
parent::init();
}