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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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<!-- 商品表数据映射文件 -->
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<mapper namespace="com.example.mapper.GoodsMapper">
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<!-- 定义商品表基础字段列表 -->
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<sql id="Base_Column_List">
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id,name,description,img,price,unit,count,type_id,business_id
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</sql>
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<!-- 查询所有商品（关联查询分类和商家信息） -->
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<select id="selectAll" resultType="com.example.entity.Goods">
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select goods.*,
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type.name as typeName, <!-- 分类名称 -->
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business.name as businessName <!-- 商家名称 -->
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from goods
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left join type on goods.type_id = type.id <!-- 关联分类表 -->
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left join business on goods.business_id = business.id <!-- 关联商家表 -->
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<where>
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<if test="id != null"> and id= #{id}</if>
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<if test="name != null"> and goods.name like concat('%', #{name}, '%')</if> <!-- 商品名称模糊搜索 -->
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<if test="description != null"> and description= #{description}</if>
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<if test="img != null"> and img= #{img}</if>
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<if test="price != null"> and price= #{price}</if>
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<if test="unit != null"> and unit= #{unit}</if>
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<if test="count != null"> and count= #{count}</if> <!-- 库存数量 -->
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<if test="typeId != null"> and type_id= #{typeId}</if> <!-- 分类ID -->
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<if test="businessId != null"> and business_id= #{businessId}</if> <!-- 商家ID -->
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</where>
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order by id desc <!-- 按ID降序排列，新的在前 -->
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</select>
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<!-- 根据ID查询单个商品（关联查询分类和商家信息） -->
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<select id="selectById" resultType="com.example.entity.Goods">
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select goods.*,
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business.name as businessName, <!-- 商家名称 -->
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type.name as typeName <!-- 分类名称 -->
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from goods
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left join business on goods.business_id = business.id <!-- 关联商家表 -->
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left join type on goods.type_id = type.id <!-- 关联分类表 -->
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where goods.id = #{id}
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</select>
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<!-- 根据ID删除商品 -->
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<delete id="deleteById">
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delete from goods
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where id = #{id}
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</delete>
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<!-- 新增商品 -->
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<insert id="insert" parameterType="com.example.entity.Goods" useGeneratedKeys="true">
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insert into goods
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<trim prefix="(" suffix=")" suffixOverrides=",">
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<if test="id != null">id,</if>
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<if test="name != null">name,</if>
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<if test="description != null">description,</if>
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<if test="img != null">img,</if>
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<if test="price != null">price,</if>
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<if test="unit != null">unit,</if>
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<if test="count != null">count,</if>
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<if test="typeId != null">type_id,</if>
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<if test="businessId != null">business_id,</if>
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</trim>
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<trim prefix="values (" suffix=")" suffixOverrides=",">
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<if test="id != null">#{id},</if>
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<if test="name != null">#{name},</if>
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<if test="description != null">#{description},</if>
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<if test="img != null">#{img},</if>
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<if test="price != null">#{price},</if>
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<if test="unit != null">#{unit},</if>
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<if test="count != null">#{count},</if>
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<if test="typeId != null">#{typeId},</if>
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<if test="businessId != null">#{businessId},</if>
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</trim>
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</insert>
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<!-- 根据ID修改商品信息 -->
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<update id="updateById" parameterType="com.example.entity.Goods">
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update goods
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<set>
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<if test="name != null">
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name = #{name}, <!-- 商品名称 -->
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</if>
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<if test="description != null">
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description = #{description}, <!-- 商品描述 -->
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</if>
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<if test="img != null">
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img = #{img}, <!-- 商品图片 -->
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</if>
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<if test="price != null">
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price = #{price}, <!-- 商品价格 -->
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</if>
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<if test="unit != null">
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unit = #{unit}, <!-- 商品单位 -->
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</if>
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<if test="count != null">
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count = #{count}, <!-- 库存数量 -->
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</if>
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<if test="typeId != null">
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type_id = #{typeId}, <!-- 分类ID -->
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</if>
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<if test="businessId != null">
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business_id = #{businessId}, <!-- 商家ID -->
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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> |
