mybatis 實現遞迴查詢出樹結構節點

<?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.modules.guide.mapper.BookDirectoryDao">

  <resultMap id="directoryVoMap" type="com.modules.guide.vo.BookDirectoryVo">
    <id column="id" jdbcType="VARCHAR" property="id" />
    <result column="book_id" jdbcType="VARCHAR" property="bookId" />
    <result column="directory_name" jdbcType="VARCHAR" property="directoryName" />
    <result column="page_num" jdbcType="INTEGER" property="pageNum" />
    <result column="grade" jdbcType="INTEGER" property="grade" />
    <result column="parent_id" jdbcType="VARCHAR" property="parentId" />
    <result column="del_flag" jdbcType="INTEGER" property="delFlag" />
    <result column="create_by" jdbcType="VARCHAR" property="createBy" />
    <result column="create_date" jdbcType="TIMESTAMP" property="createDate" />
 	<collection property="children" column="{id=id,grade=grade}" ofType="map" javaType="java.util.List" select="getChildrenList" >

	</collection>
  </resultMap>
  
  
  <resultMap id="nextDirectoryVoMap" type="com.modules.guide.vo.BookDirectoryVo">
    <id column="id" jdbcType="VARCHAR" property="id" />
    <result column="book_id" jdbcType="VARCHAR" property="bookId" />
    <result column="directory_name" jdbcType="VARCHAR" property="directoryName" />
    <result column="page_num" jdbcType="INTEGER" property="pageNum" />
    <result column="grade" jdbcType="INTEGER" property="grade" />
    <result column="parent_id" jdbcType="VARCHAR" property="parentId" />
    <result column="del_flag" jdbcType="INTEGER" property="delFlag" />
    <result column="create_by" jdbcType="VARCHAR" property="createBy" />
    <result column="create_date" jdbcType="TIMESTAMP" property="createDate" />
 	<collection property="children" column="{id=id,grade=grade}" ofType="map" javaType="java.util.List" select="getChildrenList" >

	</collection>
  </resultMap>

<select id="query" parameterType="java.util.Map"  resultType="BookDirectory">
	select * from t_guide_book_directory  where 1=1
	<if test="id!=null and id!=''">
				and id=#{id}
       </if>
       <if test="queryparam!=null and queryparam!=''">
				${queryparam}
       </if>
         order by page_num asc
</select>
		
		
<!-- 電子書目錄列表查詢 -->
<select id="getBookDirectoryVo" parameterType="com.modules.guide.entity.BookDirectory" resultMap="nextDirectoryVoMap">
	 select * from t_guide_book_directory 
	 where book_id = #{bookId,jdbcType=VARCHAR} 
	 and parent_id LIKE CONCAT('%',#{parentId,jdbcType=VARCHAR} ,'%') 
	 and grade = #{grade,jdbcType=INTEGER}
	 order by page_num asc 
</select>

<!-- 電子書子目錄 -->
<select id="getChildrenList" parameterType="java.util.Map" resultMap="directoryVoMap">
	select * from t_guide_book_directory 
	where parent_id LIKE CONCAT('%',CONCAT(#{id,jdbcType=VARCHAR},"_",#{grade,jdbcType=VARCHAR}) ,'%') 
	and grade = (#{grade,jdbcType=INTEGER} + 1)
	 order by page_num asc 
</select>

</mapper>