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

    <sql id="Base_Column_List">
        id,address,door_no,user_name,phone,user_id
    </sql>

    <select id="selectAll" resultType="com.example.entity.Address">
        select
        address.*, user.name as `user`
        from address
        left join user
        on address.user_id = user.id
        <where>
            <if test="userName != null"> and user.name like concat('%', #{userName}, '%')</if>
            <if test="userId != null"> and user.id =#{userId}</if>
        </where>
        order by id desc
    </select>

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

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

    <insert id="insert" parameterType="com.example.entity.Address" useGeneratedKeys="true" keyProperty="id">
        insert into address
        <trim prefix="(" suffix=")" suffixOverrides=",">
            <if test="id != null">id,</if>
            <if test="address != null">address,</if>
            <if test="doorNo != null">door_no,</if>
            <if test="userName != null">user_name,</if>
            <if test="phone != null">phone,</if>
            <if test="userId != null">user_id,</if>
        </trim>
        <trim prefix="values (" suffix=")" suffixOverrides=",">
            <if test="id != null">#{id},</if>
            <if test="address != null">#{address},</if>
            <if test="doorNo != null">#{doorNo},</if>
            <if test="userName != null">#{userName},</if>
            <if test="phone != null">#{phone},</if>
            <if test="userId != null">#{userId},</if>
        </trim>
    </insert>

    <update id="updateById" parameterType="com.example.entity.Address">
        update address
        <set>
            <if test="address != null">
                address = #{address},
            </if>
            <if test="doorNo != null">
                door_no = #{doorNo},
            </if>
            <if test="userName != null">
                user_name = #{userName},
            </if>
            <if test="phone != null">
                phone = #{phone},
            </if>
            <if test="userId != null">
                user_id = #{userId},
            </if>
        </set>
        where id = #{id}
    </update>

</mapper>