订单和订单详情的一对一 ，一对多映射

我们知道，订单和订单详情是一对多的关系，所以在订单Bean（OrderBean）中包含一个订单详情Bean(OrderDetailBean)的集合.

开发步骤：

1、先建好OrderDetailBean

  1 package com.november.query.zuoye1;
  2 
  3 import java.sql.Date;
  4 
  5 public class OrderDetailBean {
  6 
  7     //订单详情实体
  8     private int orderDetailId;
  9     private int orderId;
 10     private int goodsId;
 11     private int orderAmount;
 12     private String orderMoneyPayType;
 13     private Date orderPayTime;
 14     private int isReview;
 15     
 16     
 17     public OrderDetailBean() {
 18         super();
 19     }
 20 
 21 
 22     public OrderDetailBean(int orderDetailId, int orderId, int goodsId,
 23             int orderAmount, String orderMoneyPayType, Date orderPayTime,
 24             int isReview) {
 25         super();
 26         this.orderDetailId = orderDetailId;
 27         this.orderId = orderId;
 28         this.goodsId = goodsId;
 29         this.orderAmount = orderAmount;
 30         this.orderMoneyPayType = orderMoneyPayType;
 31         this.orderPayTime = orderPayTime;
 32         this.isReview = isReview;
 33     }
 34 
 35 
 36     public int getOrderDetailId() {
 37         return orderDetailId;
 38     }
 39 
 40 
 41     public void setOrderDetailId(int orderDetailId) {
 42         this.orderDetailId = orderDetailId;
 43     }
 44 
 45 
 46     public int getOrderId() {
 47         return orderId;
 48     }
 49 
 50 
 51     public void setOrderId(int orderId) {
 52         this.orderId = orderId;
 53     }
 54 
 55 
 56     public int getGoodsId() {
 57         return goodsId;
 58     }
 59 
 60 
 61     public void setGoodsId(int goodsId) {
 62         this.goodsId = goodsId;
 63     }
 64 
 65 
 66     public int getOrderAmount() {
 67         return orderAmount;
 68     }
 69 
 70 
 71     public void setOrderAmount(int orderAmount) {
 72         this.orderAmount = orderAmount;
 73     }
 74 
 75 
 76     public String getOrderMoneyPayType() {
 77         return orderMoneyPayType;
 78     }
 79 
 80 
 81     public void setOrderMoneyPayType(String orderMoneyPayType) {
 82         this.orderMoneyPayType = orderMoneyPayType;
 83     }
 84 
 85 
 86     public Date getOrderPayTime() {
 87         return orderPayTime;
 88     }
 89 
 90 
 91     public void setOrderPayTime(Date orderPayTime) {
 92         this.orderPayTime = orderPayTime;
 93     }
 94 
 95 
 96     public int getIsReview() {
 97         return isReview;
 98     }
 99 
100 
101     public void setIsReview(int isReview) {
102         this.isReview = isReview;
103     }
104 
105 
106     @Override
107     public String toString() {
108         return "OrderDetialBean [orderDetailId=" + orderDetailId + ", orderId="
109                 + orderId + ", goodsId=" + goodsId + ", orderAmount="
110                 + orderAmount + ", orderMoneyPayType=" + orderMoneyPayType
111                 + ", orderPayTime=" + orderPayTime + ", isReview=" + isReview
112                 + "]";
113     }
114     
115     
116 
117 }

2、建好OrderBean,里面放一个OrderDetailBean的集合

  1 package com.november.query.zuoye1;
  2 
  3 import java.sql.Date;
  4 import java.util.List;
  5 
  6 //订单实体
  7 public class OrderBean {
  8 
  9     private int orderId;
 10     private int orderNo;
 11     private String userName;
 12     private int orderState;
 13     private int addressId;
 14     private Date orderTime;
 15     
 16     //订单对应多个订单详情 一对多的关系，所以维护一个 集合对象
 17     List orderDetail;
 18 
 19     public OrderBean() {
 20         super();
 21     }
 22 
 23     public OrderBean(int orderId, int orderNo, String userName, int orderState,
 24             int addressId, Date orderTime, List orderDetail) {
 25         super();
 26         this.orderId = orderId;
 27         this.orderNo = orderNo;
 28         this.userName = userName;
 29         this.orderState = orderState;
 30         this.addressId = addressId;
 31         this.orderTime = orderTime;
 32         this.orderDetail = orderDetail;
 33     }
 34 
 35     public int getOrderId() {
 36         return orderId;
 37     }
 38 
 39     public void setOrderId(int orderId) {
 40         this.orderId = orderId;
 41     }
 42 
 43     public int getOrderNo() {
 44         return orderNo;
 45     }
 46 
 47     public void setOrderNo(int orderNo) {
 48         this.orderNo = orderNo;
 49     }
 50 
 51     public String getUserName() {
 52         return userName;
 53     }
 54 
 55     public void setUserName(String userName) {
 56         this.userName = userName;
 57     }
 58 
 59     public int getOrderState() {
 60         return orderState;
 61     }
 62 
 63     public void setOrderState(int orderState) {
 64         this.orderState = orderState;
 65     }
 66 
 67     public int getAddressId() {
 68         return addressId;
 69     }
 70 
 71     public void setAddressId(int addressId) {
 72         this.addressId = addressId;
 73     }
 74 
 75     public Date getOrderTime() {
 76         return orderTime;
 77     }
 78 
 79     public void setOrderTime(Date orderTime) {
 80         this.orderTime = orderTime;
 81     }
 82 
 83     public List getOrderDetail() {
 84         return orderDetail;
 85     }
 86 
 87     public void setOrderDetail(List orderDetail) {
 88         this.orderDetail = orderDetail;
 89     }
 90 
 91     @Override
 92     public String toString() {
 93         return "OrderBean [orderId=" + orderId + ", orderNo=" + orderNo
 94                 + ", userName=" + userName + ", orderState=" + orderState
 95                 + ", addressId=" + addressId + ", orderTime=" + orderTime
 96                 + ", orderDetail=" + orderDetail + "]";
 97     }
 98     
 99     
100 
101 }

3、创建接口OrderMapper.java 和  OrderMapper.xml  ,注意：这两个的命名必须相同

　　OrderMapper.java写各种方法的接口,代码如下:

1 package com.november.query.zuoye1;
2 
3 import java.util.List;
4 
5 public interface OrderMapper {
6     
7     List findOrderList();
8 
9 }

       OrderMapper.xml  代码如下：

 1 
 2 DOCTYPE mapper
 3 PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
 4 "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
 5 
 6 
 7 
 8     
 9     
10     
11     
12     
13         select * from t_Order ord join t_OrderDetail detail on ord.OrderId = detail.OrderId
14     
15     
16     
17     
18     
24     
25         
26         
27         
28         
29         
30         
31         
32         
33         
34         
35         
36         
37             
38             
39             
40             
41             
42             
43             
44             
45             
46             
47         
48 
49     
50 
51 

4、建立一个测试类 OrderTest

 1 package com.november.query.zuoye1;
 2 
 3 import java.io.IOException;
 4 import java.io.InputStream;
 5 import java.util.List;
 6 
 7 import org.apache.ibatis.io.Resources;
 8 import org.apache.ibatis.session.SqlSession;
 9 import org.apache.ibatis.session.SqlSessionFactory;
10 import org.apache.ibatis.session.SqlSessionFactoryBuilder;
11 import org.junit.Before;
12 import org.junit.Test;
13 
14 public class OrderTest {
15     
16     private SqlSessionFactory sqlSessionFactory = null;
17     //在执行测试方法之前 执行的 方法
18     @Before
19     public void init(){
20         //对mybatis环境进行 初始化
21         String resource = "config/mybatis.xml";
22         
23         try {
24             //1)读取配置文件
25             InputStream input = Resources.getResourceAsStream(resource);
26             //2)使用SQlSessionFactoryBuilder 创建SqlSessionFactory
27             sqlSessionFactory = new SqlSessionFactoryBuilder().build(input);
28     
29             
30         } catch (IOException e) {
31             // TODO Auto-generated catch block
32             e.printStackTrace();
33         }
34     }
35     
36     @Test
37     public void findOrderTest(){
38         
39         SqlSession session = sqlSessionFactory.openSession();
40         OrderMapper mapper =  session.getMapper(OrderMapper.class);
41         List list = mapper.findOrderList();
42         session.close();
43         System.out.println(list);
44     }
45 
46 }

5、运行结果

 

转载于:https://www.cnblogs.com/xsy20181001/p/9898979.html