关于在线考试系统的一个数据库语句mybatis--mapper.xml，用户关联试卷，试卷关联题目，题目关联选项，答案，解析

<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="com.example.tsfunmicropro.dao.UserDao">
      <resultMap id="userMap" type="com.example.tsfunmicropro.model.User">
          <id property="id" column="id" javaType="java.lang.Integer"></id>
          <result property="username" column="username" javaType="java.lang.String"/>
          <result property="password" column="password" javaType="java.lang.String"/>
          <result property="telephone" column="telephone" javaType="java.lang.String"/>
          <result property="sex" column="sex" javaType="java.lang.String"/>
          <result property="address" column="address" javaType="java.lang.String"/>
          <!--处理一对多，一个人对应多个收藏题目，多个错题题目，多个试卷，多个题库-->
          <collection property="examinations" ofType="com.example.tsfunmicropro.model.Examination">
              <id column="id" property="id" javaType="java.lang.String"></id>
              <result column="name" property="name" javaType="java.lang.String"></result>
              <result column="source" property="source" javaType="java.lang.String"></result>
              <result column="number" property="number" javaType="java.lang.Integer"></result>
              <result column="typetotalnumber" property="typetotalnumber" javaType="java.lang.Integer"></result>
              <collection property="lists" ofType="com.example.tsfunmicropro.model.Title">
                  <id column="id" property="id" javaType="java.lang.String"></id>
                  <result column="titletype" property="titletype" javaType="java.lang.String"></result>
                  <result column="titledifficulty" property="titledifficulty" javaType="java.lang.String"></result>
                  <result column="titlenumber" property="titlenumber" javaType="java.lang.Integer"></result>
                  <result column="titletype" property="titletype" javaType="java.lang.String"></result>
                  <result column="stem" property="stem" javaType="java.lang.String"></result>
                  <result column="createtime" property="createtime" javaType="java.lang.String"></result>
                  <result column="createperson" property="createperson" javaType="java.lang.String"></result>
                  <collection property="titleoptions" ofType="com.example.tsfunmicropro.model.Title">
                      <id column="id" property="id" javaType="java.lang.String"></id>
                      <result column="optionNumber" property="optionNumber" javaType="java.lang.Integer"></result>
                      <result column="optionDetail" property="optionDetail" javaType="java.lang.String"></result>
                  </collection>
                  <collection property="titleanswers" ofType="com.example.tsfunmicropro.model.Title">
                      <id column="id" property="id" javaType="java.lang.String"></id>
                      <result column="answerDetail" property="answerDetail" javaType="java.lang.Integer"></result>
                  </collection>
                  <collection property="titleanalyses" ofType="com.example.tsfunmicropro.model.Title">
                      <id column="id" property="id" javaType="java.lang.String"></id>
                      <result column="analyseDetail" property="analyseDetail" javaType="java.lang.Integer"></result>
                  </collection>
              </collection>
          </collection>
      </resultMap>

</mapper>