GraduationDesign/errand/springboot/target/classes/mapper/OrdersMapper.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.OrdersMapper">

    <sql id="Base_Column_List">
        id,order_no,name,descr,img,type,weight,price,user_id,accept_id,time,accept_time,status,address_id,target_id,comment
    </sql>

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

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

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

    <insert id="insert" parameterType="com.example.entity.Orders" useGeneratedKeys="true">
        insert into orders
        <trim prefix="(" suffix=")" suffixOverrides=",">
            <if test="id != null">id,</if>
            <if test="orderNo != null">order_no,</if>
            <if test="name != null">name,</if>
            <if test="descr != null">descr,</if>
            <if test="img != null">img,</if>
            <if test="type != null">type,</if>
            <if test="weight != null">weight,</if>
            <if test="price != null">price,</if>
            <if test="userId != null">user_id,</if>
            <if test="acceptId != null">accept_id,</if>
            <if test="time != null">time,</if>
            <if test="acceptTime != null">accept_time,</if>
            <if test="status != null">status,</if>
            <if test="addressId != null">address_id,</if>
            <if test="targetId != null">target_id,</if>
            <if test="comment != null">comment,</if>
        </trim>
        <trim prefix="values (" suffix=")" suffixOverrides=",">
            <if test="id != null">#{id},</if>
            <if test="orderNo != null">#{orderNo},</if>
            <if test="name != null">#{name},</if>
            <if test="descr != null">#{descr},</if>
            <if test="img != null">#{img},</if>
            <if test="type != null">#{type},</if>
            <if test="weight != null">#{weight},</if>
            <if test="price != null">#{price},</if>
            <if test="userId != null">#{userId},</if>
            <if test="acceptId != null">#{acceptId},</if>
            <if test="time != null">#{time},</if>
            <if test="acceptTime != null">#{acceptTime},</if>
            <if test="status != null">#{status},</if>
            <if test="addressId != null">#{addressId},</if>
            <if test="targetId != null">#{targetId},</if>
            <if test="comment != null">#{comment},</if>
        </trim>
    </insert>

    <update id="updateById" parameterType="com.example.entity.Orders">
        update orders
        <set>
            <if test="orderNo != null">
                order_no = #{orderNo},
            </if>
            <if test="name != null">
                name = #{name},
            </if>
            <if test="descr != null">
                descr = #{descr},
            </if>
            <if test="img != null">
                img = #{img},
            </if>
            <if test="type != null">
                type = #{type},
            </if>
            <if test="weight != null">
                weight = #{weight},
            </if>
            <if test="price != null">
                price = #{price},
            </if>
            <if test="userId != null">
                user_id = #{userId},
            </if>
            <if test="acceptId != null">
                accept_id = #{acceptId},
            </if>
            <if test="time != null">
                time = #{time},
            </if>
            <if test="acceptTime != null">
                accept_time = #{acceptTime},
            </if>
            <if test="status != null">
                status = #{status},
            </if>
            <if test="addressId != null">
                address_id = #{addressId},
            </if>
            <if test="targetId != null">
                target_id = #{targetId},
            </if>
            <if test="comment != null">
                comment = #{comment},
            </if>
        </set>
        where id = #{id}
    </update>

</mapper>