Mybatis resultMap实现一对多的映射

假设user和orders为一对多的关系，一个user对应多个订单
User.java

package per.czt.ssm.domain;

import java.util.List;
import java.util.Set;

public class User {
	private Integer id;
	private String username;
	
	private String password;

	private List<Orders> ordersList;
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	public List<Orders> getOrdersList() {
		return ordersList;
	}
	public void setOrdersList(List<Orders> ordersList) {
		this.ordersList = ordersList;
	}
	
	
	
	
	
}

Orders.java

package per.czt.ssm.domain;

public class Orders {
	private Integer id;
	private User user;
	private Integer userId;
	
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public User getUser() {
		return user;
	}
	public void setUser(User user) {
		this.user = user;
	}
	public Integer getUserId() {
		return userId;
	}
	public void setUserId(Integer userId) {
		this.userId = userId;
	}
	
	
}

配置文件

<?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">

<!-- 配置命名空间 -->
<mapper namespace="per.czt.ssm.domain">
	<!-- 一个订单对应一个用户 -->
    <resultMap type="per.czt.ssm.domain.Orders" id="Orders">
		<id property="id" column="oid" />
		<!--<result column="userId" property="userId" />  -->
		<association property="user"
			javaType="per.czt.ssm.domain.User" >
			
			<id property="id" column="uid" />
		  <result property="username" column="username" />
			<result property="password" column="password" />

		</association>
	</resultMap>

	

	<!-- 配置查询语句 -->
	<select id="searchOrders"
		parameterType="per.czt.ssm.domain.Orders" resultMap="Orders">
		select * from
		orders,user where user.uid=orders.userId

	</select>

	<!-- 假设user和orders是一对多 -->
	<resultMap type="per.czt.ssm.domain.User" id="userMap">
		<id property="id" column="uid" />
		<result column="username" property="username" />
		<result column="password" property="password" />
		<collection property="ordersList"
			ofType="per.czt.ssm.domain.Orders" >
			<id property="id" column="oid" />
			<result property="userId" column="userId"/>
		
		</collection>
	</resultMap>

	<!-- 配置查询语句 -->
	<select id="searchUser" parameterType="per.czt.ssm.domain.User"
		resultMap="userMap">
		select *  from user,orders where user.uid=orders.userId

	</select>










</mapper>