MyBatis级联多个对象属性赋值

一个客户有多个订单，   一个订单对应一个客户

需求：查询一个用户，得到对应的用户及相关订单

两个实体类

package com.bullet.domain;

import lombok.Getter;
import lombok.Setter;
import lombok.ToString;

import java.util.ArrayList;
import java.util.List;

@Setter
@Getter@ToString
public class Customer {
    private Integer cust_id;
    private String cust_name;
    private String cust_profession;
    private String cust_phone;
    private String email;
    private List<Order> orders = new ArrayList<>();

}

package com.bullet.domain;

import lombok.Getter;
import lombok.Setter;
import lombok.ToString;

@Setter@Getter@ToString
public class Order {
    private Integer order_id;
    private String order_name;
    private String order_num;
    private Customer customer;
}

customermapper.xml中的结果属性设置

级联一个对象的属性设置用association

级联多个对象的属性设置用collection

javatype 表明orders是一个list集合    oftype表明list集合中装的都是  Order类型

 <select id="getAllCustomers" resultMap="custMap">
        SELECT * from `customer` as c LEFT JOIN `order` as o ON c.cust_id=o.cust_id;
    </select>

    <resultMap id="custMap" type="Customer">
        <id column="cust_id" property="cust_id"/>
        <result column="cust_name" property="cust_name"/>
        <result column="cust_profession" property="cust_profession"/>
        <result column="cust_phone" property="cust_phone"/>
        <result column="email" property="email"/>

      <collection property="orders" javaType="list" ofType="Order">
          <id column="order_id" property="order_id"/>
          <result column="order_num" property="order_num"/>
          <result column="order_name" property="order_name"/>
      </collection>

    </resultMap>

和级联一个对象使用association相同，查询对象的自身属性不能省略！！！