在MySQL中暂无相关函数，可以通过自定义函数方式来解决;
函数创建：
进入MySQL Command Line Client
mysql> delimiter $$mysql>mysql> CREATE FUNCTION `getTreeNodes`(rootId INT) -> RETURNS varchar(1000) -> BEGIN -> DECLARE sTemp VARCHAR(1000); -> DECLARE sTempChd VARCHAR(1000); -> -> SET sTemp = '$'; -> SET sTempChd =cast(rootId as CHAR); -> -> WHILE sTempChd is not null DO -> SET sTemp = concat(sTemp,',',sTempChd); -> SELECT group_concat(table_pk) INTO sTempChd FROM your_tree_table where FIND_IN_SET(pid,sTempChd)>0; -> END WHILE; -> RETURN sTemp; -> END -> $$Query OK, 0 rows affected (0.00 sec)mysql>函数调用：
SELECT * FROM your_tree_table WHERE FIND_IN_SET(table_pk, getTreeNodes(rootid));下载本文
