数据库使用事务

$db = JFactory::getDBo();
try{
	// 开启事务
	$db->transactionStart();
	
	// 提交
	$db->transactionCommit();
	$res = new StdClass();
	$res->err = (object) ['code' => 0, 'msg' => '发送成功'];
	$res->data = [];
	echo json_encode($res);
}catch(Exception $e){
	// 回滚
	$db->transactionRollback();
	$res = new StdClass();
	$res->err = (object) ['code' => 1, 'msg' => $e->getMessage()];
	$res->data = [];
	echo json_encode($res);
}