Java进阶知识10 Hibernate一对多单向关联(Annotation+XML实现)

1、Annotation 注解版  

1.1、在一的一方加Set

1.2、创建Customer类和Order类

 1 package com.shore.model;
 2 
 3 import java.util.HashSet;
 4 import java.util.Set;
 5 
 6 import javax.persistence.Entity;
 7 import javax.persistence.Id;
 8 import javax.persistence.JoinColumn;
 9 import javax.persistence.OneToMany;
10 import javax.persistence.Table;
11 
12 /**
13  * @author DSHORE/2019-9-19
14  * 一对多,单向关联(注解版)
15  */
16 @Entity
17 @Table(name="anno_customer")
18 public class Customer {//顾客  (“一”的一方),在“一”的一方加Set
19     private Integer id;
20     private String name;
21     private Integer age;
22     private Set<Order> orders = new HashSet<Order>();  //在“一”的一方加Set
23     /**
24      * List 有序,可重复,可以用index取值(get(index))
25      * Set  无序,不可重复
26      */
27     
28     @Id
29     public Integer getId() {
30         return id;
31     }
32     public void setId(Integer id) {
33         this.id = id;
34     }
35     public String getName() {
36         return name;
37     }
38     public void setName(String name) {
39         this.name = name;
40     }
41     public Integer getAge() {
42         return age;
43     }
44     public void setAge(Integer age) {
45         this.age = age;
46     }
47     
48     @OneToMany  //一对多
49     @JoinColumn(name="customerId")
50     public Set<Order> getOrders() {//在“一”的一方加Set
51         return orders;
52     }
53     public void setOrders(Set<Order> orders) {
54         this.orders = orders;
55     }
56 }

Order类

 1 package com.shore.model;
 2 
 3 import javax.persistence.Entity;
 4 import javax.persistence.Id;
 5 import javax.persistence.Table;
 6 
 7 /**
 8  * @author DSHORE/2019-9-19
 9  *  一对多,单向关联(注解版)
10  */
11 @Entity
12 @Table(name="anno_order") //Order是MySQL数据库关键字。需重新定义表名
13 public class Order {//订单  (“多”的一方)
14     private Integer id;
15     private String number;
16     private Float sum;
17     
18     @Id
19     public Integer getId() {
20         return id;
21     }
22     public void setId(Integer id) {
23         this.id = id;
24     }
25     public String getNumber() {
26         return number;
27     }
28     public void setNumber(String number) {
29         this.number = number;
30     }
31     public Float getSum() {
32         return sum;
33     }
34     public void setSum(Float sum) {
35         this.sum = sum;
36     }
37 }

1.3、创建hibernate.cfg.xml核心配置文件

 1 <?xml version='1.0' encoding='utf-8'?>
 2 <!DOCTYPE hibernate-configuration PUBLIC
 3         "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
 4         "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
 5 
 6 <hibernate-configuration>
 7     <session-factory>
 8         <!-- Database connection settings -->
 9         <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
10         <property name="connection.url">jdbc:mysql://localhost:3306/hibernate</property>
11         <property name="connection.username">root</property>
12         <property name="connection.password">123456</property>
13 
14         <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
15         <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
16         <property name="show_sql">true</property>
17         <property name="hbm2ddl.auto">create</property>
18 
19         <mapping class="com.shore.model.Customer" />
20         <mapping class="com.shore.model.Order" />
21         <!-- <mapping resource="com/shore/model/Customer.hbm.xml" />
22         <mapping resource="com/shore/model/Order.hbm.xml" /> -->
23     </session-factory>
24 </hibernate-configuration>

1.4、开始测试

 1 package com.shore.test;
 2 
 3 import org.hibernate.cfg.AnnotationConfiguration;
 4 import org.hibernate.tool.hbm2ddl.SchemaExport;
 5 import org.junit.Test;
 6 
 7 /**
 8  * @author DSHORE/2019-9-19
 9  *
10  */
11 public class AnnotationTest {
12     @Test
13     public void test() {//简单测试,只创建表,不插入数据
14                     //注解版,用AnnotationConfiguration()方法
15         new SchemaExport(new AnnotationConfiguration().configure()).create(
16                 false, true);
17     }
18 }

测试结果图:

     

 

 

 

2、XML版 的实现  

2.1、创建Customer类和Order类

 1 package com.shore.model;
 2 
 3 import java.util.HashSet;
 4 import java.util.Set;
 5 
 6 /**
 7  * @author DSHORE/2019-9-19
 8  * 一对多,单向关联(xml版)
 9  */
10 public class Customer {//顾客  (“一”的一方),在一的一方加Set
11     private Integer id;
12     private String name;
13     private Integer age;
14     private Set<Order> orders = new HashSet<Order>(); //在“一”的一方加Set
15     
16     public Integer getId() {
17         return id;
18     }
19     public void setId(Integer id) {
20         this.id = id;
21     }
22     public String getName() {
23         return name;
24     }
25     public void setName(String name) {
26         this.name = name;
27     }
28     public Integer getAge() {
29         return age;
30     }
31     public void setAge(Integer age) {
32         this.age = age;
33     }
34     public Set<Order> getOrders() {
35         return orders;
36     }
37     public void setOrders(Set<Order> orders) {
38         this.orders = orders;
39     }
40 }

Order类

 1 package com.shore.model;
 2 
 3 /**
 4  * @author DSHORE/2019-9-19
 5  * 一对多,单向关联(xml版)
 6  */
 7 public class Order {//订单  (“多”的一方)
 8     private Integer id;
 9     private String number;
10     private Float sum;
11     
12     public Integer getId() {
13         return id;
14     }
15     public void setId(Integer id) {
16         this.id = id;
17     }
18     public String getNumber() {
19         return number;
20     }
21     public void setNumber(String number) {
22         this.number = number;
23     }
24     public Float getSum() {
25         return sum;
26     }
27     public void setSum(Float sum) {
28         this.sum = sum;
29     }
30 }

2.2、创建 Customer.hbm.xml 配置文件和 Order.hbm.xml 配置文件

 1 <?xml version="1.0"?>
 2 <!DOCTYPE hibernate-mapping PUBLIC
 3         "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
 4         "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
 5         
 6 <hibernate-mapping package="com.shore.model">
 7     <class name="Customer" table="customer_xml">  
 8        <id name="id"> 
 9             <generator class="native"/>
10         </id>
11         <property name="name" type="java.lang.String"/>
12         <property name="age" type="java.lang.Integer"/>
13         
14         <!-- 一对多,在“一”的一方的配置文件中用set标签 -->
15         <set name="orders">
16             <key column="customerId"></key>
17             <one-to-many class="com.shore.model.Order"/>
18         </set>
19     </class>
20 </hibernate-mapping>

Order.hbm.xml 配置文件

 1 <?xml version="1.0"?>
 2 <!DOCTYPE hibernate-mapping PUBLIC
 3         "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
 4         "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
 5         
 6 <hibernate-mapping package="com.shore.model">
 7     <class name="Order" table="order_xml">  
 8         <id name="id"> 
 9             <generator class="native"/>
10         </id>
11         <property name="number" type="java.lang.String"/>
12         <property name="sum" type="java.lang.Float"/>
13     </class>
14 </hibernate-mapping>

2.3、创建hibernate.cfg.xml 核心配置文件

 1 <?xml version='1.0' encoding='utf-8'?>
 2 <!DOCTYPE hibernate-configuration PUBLIC
 3         "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
 4         "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
 5 
 6 <hibernate-configuration>
 7     <session-factory>
 8         <!-- Database connection settings -->
 9         <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
10         <property name="connection.url">jdbc:mysql://localhost:3306/hibernate</property>
11         <property name="connection.username">root</property>
12         <property name="connection.password">123456</property>
13 
14         <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
15         <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
16         <property name="show_sql">true</property>
17         <property name="hbm2ddl.auto">create</property>
18 
19         <!-- <mapping class="com.shore.model.Customer" />
20         <mapping class="com.shore.model.Order" /> -->
21         <mapping resource="com/shore/model/Customer.hbm.xml" />
22         <mapping resource="com/shore/model/Order.hbm.xml" />
23     </session-factory>
24 </hibernate-configuration>

2.4、开始测试

 1 package com.shore.test;
 2 
 3 import org.hibernate.cfg.Configuration;
 4 import org.hibernate.tool.hbm2ddl.SchemaExport;
 5 import org.junit.Test;
 6 
 7 /**
 8  * @author DSHORE/2019-9-19
 9  *
10  */
11 public class XMLTest {
12     @Test
13     public void test() {//简单测试,只创建表,不插入数据
14                 //xml版,此处用Configuration()方法
15         new SchemaExport(new Configuration().configure()).create(
16                 false, true);
17     }
18 }

测试结果图:

     

 

 

 

Hibernate一对一单向关联映射(Annotation+XML实现):https://www.cnblogs.com/dshore123/p/11545058.html
Hibernate一对一双向关联映射(Annotation+XML实现):https://www.cnblogs.com/dshore123/p/11545077.html

Hibernate多对一单向关联映射(Annotation+XML实现):https://www.cnblogs.com/dshore123/p/11553213.html
Hibernate一对多单向关联映射(Annotation+XML实现):https://www.cnblogs.com/dshore123/p/11553215.html
Hibernate一对多多对一双向关联映射(Annotation+XML实现):https://www.cnblogs.com/dshore123/p/11560433.html

Hibernate多对多单向关联映射(Annotation+XML实现):https://www.cnblogs.com/dshore123/p/11568536.html
Hibernate多对多双向关联映射(Annotation+XML实现):https://www.cnblogs.com/dshore123/p/11568963.html

 

 

 

 

 

原创作者:DSHORE

作者主页:http://www.cnblogs.com/dshore123/

原文出自:https://www.cnblogs.com/dshore123/p/11553215.html

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posted @ 2019-09-19 23:11  DSHORE  阅读(193)  评论(0编辑  收藏  举报