mysql中实现WITHAS语句

WITH n(parentId) AS
(SELECT menuId

FROM TSYS_MENU

WHERE menuid in

#{item}

UNION ALL
SELECT parentId

FROM TSYS_MENU

WHERE menuid in

#{item}

UNION ALL

SELECT nplus.parentId

FROM TSYS_MENU as nplus, n

WHERE n.parentId = nplus.menuid)

SELECT distinct parentId FROM n where parentId is not null

 代码如上，如何在mysql中转换