CollegeMajorMappingMapper.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.laowu.mapper.CollegeMajorMappingMapper">

    <!-- 通用查询映射结果 -->
    <resultMap id="BaseResultMap" type="com.laowu.model.CollegeMajorMappingDO">
        <id column="id" property="id" />
        <result column="create_date" property="createDate" />
        <result column="update_date" property="updateDate" />
        <result column="delete_date" property="deleteDate" />
        <result column="college_id" property="collegeId" />
        <result column="major_id" property="majorId" />
    </resultMap>

    <!-- 通用查询结果列 -->
    <sql id="Base_Column_List">
        create_date,
        update_date,
        delete_date,
        id, college_id, major_id
    </sql>

    <select id="collegeMajors" parameterType="long" resultType="com.laowu.vo.major.CollegeMajorsVO">
        SELECT
            t.id,
            t2.id as majorId,
            t2.major,
            t2.major_code,
            t.student_cnt
        FROM
            college_major_mapping t
            LEFT JOIN lib_major t2 ON t.major_id = t2.id
        WHERE
            t.delete_date is null
            and t2.delete_date is null
            and t.college_id = #{collegeId}
    </select>

</mapper>