ieplus/ie-system/src/main/resources/mapper/learn/LearnStudentMapper.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.ruoyi.learn.mapper.LearnStudentMapper">
    
    <resultMap type="LearnStudent" id="LearnStudentResult">
        <result property="studentId"    column="student_id"    />
        <result property="directKey"    column="direct_key"    />
    </resultMap>

    <sql id="selectLearnStudentVo">
        select student_id, direct_key from learn_student
    </sql>

    <select id="selectLearnStudentList" parameterType="LearnStudent" resultMap="LearnStudentResult">
        <include refid="selectLearnStudentVo"/>
        <where>  
            <if test="directKey != null  and directKey != ''"> and direct_key = #{directKey}</if>
        </where>
    </select>
    
    <select id="selectLearnStudentByStudentId" parameterType="Long" resultMap="LearnStudentResult">
        <include refid="selectLearnStudentVo"/>
        where student_id = #{studentId}
    </select>

    <insert id="insertLearnStudent" parameterType="LearnStudent">
        insert into learn_student
        <trim prefix="(" suffix=")" suffixOverrides=",">
            <if test="studentId != null">student_id,</if>
            <if test="directKey != null">direct_key,</if>
         </trim>
        <trim prefix="values (" suffix=")" suffixOverrides=",">
            <if test="studentId != null">#{studentId},</if>
            <if test="directKey != null">#{directKey},</if>
         </trim>
    </insert>

    <update id="updateLearnStudent" parameterType="LearnStudent">
        update learn_student
        <trim prefix="SET" suffixOverrides=",">
            <if test="directKey != null">direct_key = #{directKey},</if>
        </trim>
        where student_id = #{studentId}
    </update>

    <delete id="deleteLearnStudentByStudentId" parameterType="Long">
        delete from learn_student where student_id = #{studentId}
    </delete>

    <delete id="deleteLearnStudentByStudentIds" parameterType="String">
        delete from learn_student where student_id in 
        <foreach item="studentId" collection="array" open="(" separator="," close=")">
            #{studentId}
        </foreach>
    </delete>
</mapper>