build/classes/com/xx/supermarket/xml/OrderMapper.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">
<!-- 不使用namespace的话sql搜索定位会比较方便 -->
<mapper namespace="com.xx.supermarket.entity.Order">

     <!-- 实体类与数据库映射字段部分  start -->
	<resultMap id="ResultMapOrder" type="com.xx.supermarket.entity.Order">
        <result property="id" column="id"  jdbcType="INTEGER"/>
        <result property="isDelete" column="isDelete"  jdbcType="INTEGER"/>
        <result property="orderTime" column="orderTime"  jdbcType="TIMESTAMP"/>
        <result property="status" column="status"  jdbcType="INTEGER"/>
        <result property="total" column="total"  jdbcType="DOUBLE"/>
        <result property="uid" column="uid"  jdbcType="VARCHAR"/>
        <result property="userId" column="userId"  jdbcType="INTEGER"/>
	</resultMap>
	 <!-- 实体类与数据库映射字段部分  end -->
	 
	 <!-- 声明数据库字段 -->
	<sql id="Order_field">
           id,
           isDelete,
           orderTime,
           status,
           total,
           uid,
           userId
	</sql>
	
	<!-- 实体类属性  -->
	<sql id="Order_insert">
        	#{id} ,
        	#{isDelete} ,
        	#{orderTime} ,
        	#{status} ,
        	#{total} ,
        	#{uid} ,
        	#{userId} 
	</sql>
	
	<!-- 执行修改时 数据库字段和表字段比较 -->
	<sql id="Order_update">
		    <if test="isDelete != null" >
	            isDelete = #{isDelete} ,
	        </if>
		    <if test="orderTime != null" >
	            orderTime = #{orderTime} ,
	        </if>
		    <if test="status != null" >
	            status = #{status} ,
	        </if>
		    <if test="total != null" >
	            total = #{total} ,
	        </if>
		    <if test="uid != null" >
	            uid = #{uid} ,
	        </if>
		    <if test="userId != null" >
	            userId = #{userId}