<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.pz.system.mapper.DepartmentMapper">
    <select id="selectDepartmentChildren" resultType="com.pz.system.domain.vo.DepartmentVo">
        select id as value,title as text from (
                           select t1.id,t1.title,
                                  if(find_in_set(parent_id, @pids) > 0, @pids := concat(@pids, ',', id), 0) as ischild
                           from (
                                    select id,parent_id,title from department t WHERE t.del_flag = 0 order by parent_id, id
                                ) t1,
                                (select @pids := #{parentId}) t2
                       ) t3 where ischild != 0
    </select>
</mapper>