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86 lines
3.2 KiB
86 lines
3.2 KiB
<?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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<!-- 购物车表数据映射文件 -->
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<mapper namespace="com.example.mapper.CartMapper">
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<!-- 定义购物车表基础字段列表 -->
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<sql id="Base_Column_List">
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id,user_id,business_id,goods_id,num
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</sql>
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<!-- 查询所有购物车商品（关联查询商家和商品信息） -->
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<select id="selectAll" resultType="com.example.entity.Cart">
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select cart.*,
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business.name as businessName, <!-- 商家名称 -->
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goods.img as goodsImg, <!-- 商品图片 -->
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goods.name as goodsName, <!-- 商品名称 -->
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goods.price as goodsPrice, <!-- 商品价格 -->
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goods.unit as goodUnit <!-- 商品单位 -->
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from cart
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left join business on cart.business_id = business.id <!-- 关联商家表 -->
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left join goods on cart.goods_id = goods.id <!-- 关联商品表 -->
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<where>
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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="businessId != null"> and business_id = #{businessId}</if>
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<if test="goodsId != null"> and goods_id = #{goodsId}</if>
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<if test="num != null"> and num = #{num}</if>
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</where>
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</select>
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<!-- 根据ID查询单个购物车商品 -->
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<select id="selectById" resultType="com.example.entity.Cart">
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select
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<include refid="Base_Column_List" />
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from cart
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where id = #{id}
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</select>
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<!-- 根据ID删除购物车商品 -->
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<delete id="deleteById">
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delete from cart
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where id = #{id}
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</delete>
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<!-- 新增购物车商品 -->
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<insert id="insert" parameterType="com.example.entity.Cart" useGeneratedKeys="true">
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insert into cart
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<trim prefix="(" suffix=")" suffixOverrides=",">
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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="businessId != null">business_id,</if>
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<if test="goodsId != null">goods_id,</if>
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<if test="num != null">num,</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="userId != null">#{userId},</if>
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<if test="businessId != null">#{businessId},</if>
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<if test="goodsId != null">#{goodsId},</if>
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<if test="num != null">#{num},</if>
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</trim>
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</insert>
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<!-- 根据ID修改购物车商品信息 -->
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<update id="updateById" parameterType="com.example.entity.Cart">
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update cart
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<set>
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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="businessId != null">
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business_id = #{businessId},
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</if>
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<if test="goodsId != null">
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goods_id = #{goodsId},
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</if>
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<if test="num != null">
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num = #{num}, <!-- 商品数量 -->
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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> |