build/classes/dao/CheckoutMapper.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="dao.CheckoutMapper" >
  <resultMap id="checkoutResultMap" type="Pojo.Checkout" >
    <id column="cid" property="id" jdbcType="INTEGER" />
    <result column="house_id" property="house_id" jdbcType="VARCHAR" />
    <result column="address" property="address" jdbcType="VARCHAR" />
    <result column="status" property="status" jdbcType="VARCHAR" />
     <result column="userlist_id" property="userlist_id" jdbcType="INTEGER" />
     <collection property="userlist" ofType="Pojo.Userlist">
			<id property="id" column="id"/>	
		<!--用户id已经在user对象中存在，此处可以不设置-->
			<!-- <result property="userId" column="id"/> -->
			<result property="name" column="name"/>
			<result property="idcard" column="idcard"/>
			<result property="phone" column="phone"/>
			<result property="user_id" column="user_id"/>
			
		</collection>
    
  </resultMap>
   <insert id="insertcheckout" parameterType="Pojo.Checkout">
	  insert into checkout(house_id,address,userlist_id,status) 
	  values(#{house_id},#{address},#{userlist_id},#{status})
	</insert>
	<select id="getallcheckout" resultMap="checkoutResultMap" >
		SELECT
	c.*, u.*
FROM
	`checkout` c
LEFT JOIN userlist u ON u.id = c.userlist_id
	</select>
		<delete id="deletecheckout" parameterType="Integer" >
		delete from checkout where cid=#{cid}
	</delete>
  </mapper>