mybatis根据父级编号获取所有的子级

先在数据库里面执行

CREATE FUNCTION `getBaseTypeLst`(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 base_type where FIND_IN_SET(parent_id,sTempChd)>0;

    END WHILE;

    RETURN sTemp;

     END

base_type是表名

parent_id是字段

然后mybatis调用

<select id="getBaseTypeByParentId" resultType="BaseTypeVO">

    <include refid="sql"/>   FROM BASE_TYPE WHERE FIND_IN_SET(ID,getBaseTypeLst(#{parentId}));

</select>

参数是parentId