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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE mapper
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PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
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"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
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<!-- 地址表数据映射文件 - 将Java方法映射为SQL语句 -->
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<mapper namespace="com.example.mapper.AddressMapper">
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<!-- 定义基础字段列表，避免重复编写 -->
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<sql id="Base_Column_List">
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id,user_id,username,useraddress,phone
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</sql>
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<!-- 查询所有地址（支持条件查询） -->
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<select id="selectAll" resultType="com.example.entity.Address">
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select address.*
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from address
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<where>
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<!-- 动态条件：根据传入参数决定是否添加查询条件 -->
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<if test="id != null"> and id= #{id}</if>
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<if test="userId != null"> and user_id = #{userId}</if>
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<if test="username != null"> and username = #{username}</if>
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<if test="useraddress != null"> and useraddress = #{useraddress}</if>
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<if test="phone != null"> and phone = #{phone}</if>
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</where>
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</select>
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<!-- 根据ID查询单个地址 -->
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<select id="selectById" resultType="com.example.entity.Address">
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select
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<include refid="Base_Column_List" /> <!-- 引用上面定义的字段列表 -->
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from address
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where id = #{id}
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</select>
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<!-- 根据ID删除地址 -->
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<delete id="deleteById">
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delete from address
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where id = #{id}
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</delete>
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<!-- 新增地址（动态插入非空字段） -->
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<insert id="insert" parameterType="com.example.entity.Address" useGeneratedKeys="true">
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insert into address
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<trim prefix="(" suffix=")" suffixOverrides=",">
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<!-- 只插入非空的字段 -->
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<if test="id != null">id,</if>
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<if test="userId != null">user_id,</if>
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<if test="username != null">username,</if>
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<if test="useraddress != null">useraddress,</if>
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<if test="phone != null">phone,</if>
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</trim>
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<trim prefix="values (" suffix=")" suffixOverrides=",">
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<!-- 对应的值 -->
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<if test="id != null">#{id},</if>
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<if test="userId != null">#{userId},</if>
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<if test="username != null">#{username},</if>
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<if test="useraddress != null">#{useraddress},</if>
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<if test="phone != null">#{phone},</if>
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</trim>
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</insert>
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<!-- 根据ID修改地址信息（动态更新非空字段） -->
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<update id="updateById" parameterType="com.example.entity.Address">
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update address
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<set>
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<!-- 只更新非空的字段 -->
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<if test="userId != null">
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user_id = #{userId},
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</if>
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<if test="username != null">
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username = #{username},
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</if>
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<if test="useraddress != null">
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useraddress = #{useraddress},
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</if>
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<if test="phone != null">
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phone = #{phone},
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</if>
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</set>
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where id = #{id}
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</update>
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</mapper> |
