GraduationDesign/errand/springboot/target/classes/mapper/CommentMapper.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.example.mapper.CommentMapper">

    <sql id="Base_Column_List">
        id,content,star,user_id,accept_id,order_id,time
    </sql>

    <select id="selectAll" resultType="com.example.entity.Comment">
        select
        comment.*, user1.name as userName, user2.name as acceptName, orders.order_no as orderNo
        from comment
        left join user user1
        on comment.user_id = user1.id
        left join user user2
        on comment.accept_id = user2.id
        left join orders
        on comment.order_id = orders.id
        <where>
            <if test="content != null"> and comment.content like concat('%', #{content}, '%')</if>
            <if test="userName != null"> and user1.name like concat('%', #{userName}, '%')</if>
            <if test="acceptName != null"> and user2.name like concat('%', #{acceptName}, '%')</if>
            <if test="orderNo != null"> and orders.order_no like concat('%', #{orderNo}, '%')</if>
        </where>
        order by id desc
    </select>

    <select id="selectById" resultType="com.example.entity.Comment">
        select
        <include refid="Base_Column_List" />
        from comment
        where id = #{id}
    </select>

    <delete id="deleteById">
        delete from comment
        where  id = #{id}
    </delete>

    <insert id="insert" parameterType="com.example.entity.Comment" useGeneratedKeys="true">
        insert into comment
        <trim prefix="(" suffix=")" suffixOverrides=",">
            <if test="id != null">id,</if>
            <if test="content != null">content,</if>
            <if test="star != null">star,</if>
            <if test="userId != null">user_id,</if>
            <if test="acceptId != null">accept_id,</if>
            <if test="orderId != null">order_id,</if>
            <if test="time != null">time,</if>
        </trim>
        <trim prefix="values (" suffix=")" suffixOverrides=",">
            <if test="id != null">#{id},</if>
            <if test="content != null">#{content},</if>
            <if test="star != null">#{star},</if>
            <if test="userId != null">#{userId},</if>
            <if test="acceptId != null">#{acceptId},</if>
            <if test="orderId != null">#{orderId},</if>
            <if test="time != null">#{time},</if>
        </trim>
    </insert>

    <update id="updateById" parameterType="com.example.entity.Comment">
        update comment
        <set>
            <if test="content != null">
                content = #{content},
            </if>
            <if test="star != null">
                star = #{star},
            </if>
            <if test="userId != null">
                user_id = #{userId},
            </if>
            <if test="acceptId != null">
                accept_id = #{acceptId},
            </if>
            <if test="orderId != null">
                order_id = #{orderId},
            </if>
            <if test="time != null">
                time = #{time},
            </if>
        </set>
        where id = #{id}
    </update>

</mapper>