mysql - 如何在 symfony2.0 中编写 mysql 查询？

Question

我有一个 mysql 查询，但我不知道如何在 symfony2.0 中进行查询。

询问：

SELECT a.id, a.name,
FROM `ms_musiccategory` a
LEFT OUTER JOIN `ms_musiccategory` b ON a.parent_Id = b.id
ORDER BY coalesce( b.name, a.name ) , a.name

Answer 1

 $con = $this -> getEntityManager() -> getConnection();

 $st = $con -> prepare(' SELECT a.* FROM `tablename` a LEFT OUTER JOIN `tablename` b ON a.parent_Id = b.id ORDER BY coalesce( b.name, a.name ) , a.name');

 $st -> execute();

 $list = $st -> fetchAll();