初始化v1

target/classes/mapper/OrderItemMapper.xml

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+<?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.nlshop.mapper.OrderItemMapper">
+    <resultMap id="BaseResultMap" type="com.nlshop.entity.OrderItem">
+        <id column="id" property="id"/>
+        <result column="order_id" property="orderId"/>
+        <result column="product_id" property="productId"/>
+        <result column="product_name" property="productName"/>
+        <result column="spec_name" property="specName"/>
+        <result column="quantity" property="quantity"/>
+        <result column="price" property="price"/>
+        <result column="custom_sweetness" property="customSweetness"/>
+        <result column="custom_ice" property="customIce"/>
+        <result column="toppings" property="toppings"/>
+        <result column="subtotal" property="subtotal"/>
+    </resultMap>
+
+    <insert id="insert" parameterType="com.nlshop.entity.OrderItem" useGeneratedKeys="true" keyProperty="id">
+        INSERT INTO order_item (order_id, product_id, product_name, spec_name, quantity, price,
+                               custom_sweetness, custom_ice, toppings, subtotal)
+        VALUES (#{orderId}, #{productId}, #{productName}, #{specName}, #{quantity}, #{price},
+                #{customSweetness}, #{customIce}, #{toppings}, #{subtotal})
+    </insert>
+
+    <select id="selectByOrderId" resultMap="BaseResultMap">
+        SELECT * FROM order_item WHERE order_id = #{orderId}
+    </select>
+
+    <select id="selectById" resultMap="BaseResultMap">
+        SELECT * FROM order_item WHERE id = #{id}
+    </select>
+</mapper>