service/src/main/resources/mapper/TaTestLogMapper.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.yunzhi.demo.mapper.TaTestLogMapper">

    <select id="getTestLogWithStudent" resultType="com.yunzhi.demo.vo.StudentTestLog">
        SELECT
            b.student_id,
            b.name,
            b.sex,
            b.phone,
            b.e_mail,
            a.school_id,
            b.school_batch,
            b.specialty_id,
            a.student_no,
            b.person_id,
            b.status,
            b.create_date,
            b.update_date,
            a.`name` as test_name,
            a.serial_no,
            a.attchment,
            c.`name` as school_name,
            d.`name` as specialty_name
        FROM
            ta_test_log a
            LEFT JOIN ta_student b on a.student_no = b.student_no
            LEFT JOIN td_school c on a.school_id = c.school_id
            LEFT JOIN td_specialty d on b.specialty_id = d.specialty_id
        WHERE
            a.`status` > - 1
        <if test="studentNo != null and studentNo != ''">
            AND a.student_no LIKE CONCAT( '%', #{studentNo}, '%' )
        </if>
        <if test="schoolId != null and schoolId != ''">
            AND a.school_id = #{schoolId}
        </if>
        <if test="specialtyId != null and specialtyId != ''">
            AND b.specialty_id = #{specialtyId}
        </if>
        ORDER BY
            a.create_date DESC
    </select>
</mapper>