sql和mysql递归查询子节点
//SQL SqlServer:CTE函数处理递归(WITH语法) cte可以其他名字 注意匹配(所有cte全部替换)with cte as ( select a.typeid,a.superid,a.typename from ctype a where typeid=1 union all select k.typeid,k.superid,k.typename from ctype k inner join cte c on c.typeid = k.superid )select * from cte //MYSQL 放到命令行执行CREATE FUNCTION `getChildDeptLst`(rootId INT) RETURNS varchar(1000) BEGIN DECLARE sTemp VARCHAR(1000); DECLARE sTempChd VARCHAR(1000); SET sTemp = '$'; SET sTempChd =cast(rootId as CHAR); WHILE sTempChd is not null DO SET sTemp = concat(sTemp,',',sTempChd); SELECT group_concat(id) INTO sTempChd FROM department where FIND_IN_SET(parentId,sTempChd)>0; END WHILE; RETURN sTemp;ENDselect getChildLst(1);select * from departmentg where FIND_IN_SET(id, getChildDeptLst(1));////查询子项父idSELECT T2.id, T2 .name FROM ( SELECT @r AS _id, (SELECT @r := parentId FROM department WHERE id = _id) AS parentId, @l := @l + 1 AS lvl FROM (SELECT @r := 30, @l := 0) vars, department h WHERE @r <> 0) T1 JOIN department T2 ON T1._id = T2.id ORDER BY T1.lvl DESC
