VIPJAVA/02_JavaWeb/day09_mybatis/target/classes/com/lc/mapper/DeptMapper.xml

<?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.lc.mapper.DeptMapper">

    <!-- deptByIdCollection -->
    <resultMap id="deptByIdCollection" type="com.lc.pojo.Dept">
        <id property="id" column="did"></id>
        <result property="name" column="name" ></result>
        <result property="comment" column="comment" ></result>

        <!-- 集合  -->
        <collection property="userList" ofType="com.lc.pojo.User" >
            <id property="id" column="id" ></id>
            <result property="username" column="username" ></result>
            <result property="password" column="password" ></result>
            <result property="address" column="address" ></result>
            <result property="gender" column="gender" ></result>
            <result property="deptId" column="dept_id" ></result>
        </collection>

    </resultMap>
    <select id="getDeptByIdCollection" resultMap="deptByIdCollection">
        SELECT
            u.*, d.id did , d.`name` name , d.`comment` comment
        FROM
            t_user u INNER JOIN t_dept d ON u.dept_id = d.id
        WHERE
            d.id = #{id}
    </select>
    
    
    <select id="getDeptByIdStep" resultType="dept">
        select * from t_dept where id = #{id}
    </select>



    <!--
         一对多 分布查询
     -->
    <resultMap id="deptByIdStep" type="com.lc.pojo.Dept">
        <id property="id" column="id"></id>
        <result property="name" column="name" ></result>
        <result property="comment" column="comment" ></result>
        <!--
            select="指向mapper.xml文件中的id"
            column
            fetchType="lazy" 设置懒加载
         -->
        <collection
                property="userList"
                ofType="com.lc.pojo.User"
                fetchType="lazy"
                select="com.lc.mapper.UserMapper.getUserByIdStepCollection"
                column="id"
        >

        </collection>
    </resultMap>
    <select id="getDeptByIdStepCollection" resultMap="deptByIdStep">
        select * from t_dept where id = #{id}
    </select>

</mapper>