BatchStudentMappingMapper.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.meishu.mapper.BatchStudentMappingMapper">


    <select id="batchStudents" parameterType="long" resultType="com.meishu.vo.student.BatchStudentsVO">
        SELECT
            t2.id,
            t2.user_name,
            t.exam_code,
            t.sign_date
        FROM
            batch_student_mapping t
            LEFT JOIN student t2 ON t.student_id = t2.id
        WHERE
            t.delete_date IS NULL
            AND t2.delete_date IS NULL
            AND t.batch_id = #{batchId}
    </select>

    <select id="batchStudentIds" parameterType="long" resultType="long">
        SELECT
            t2.id
        FROM
            batch_student_mapping t
            LEFT JOIN student t2 ON t.student_id = t2.id
        WHERE
            t.delete_date IS NULL
            AND t2.delete_date IS NULL
            AND t.batch_id = #{batchId}
    </select>

</mapper>