Java知识点08 Hibernate多对一单向关联（Annotation+XML实现）

1、Annotation 注解版  

1.1、在多的一方加外键

1.2、创建Customer类和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  * 多对一，单向关联（注解版）
10  */
11 @Entity
12 @Table(name="anno_customer")
13 public class Customer {//顾客  （“一”的一方）
14     private Integer id;
15     private String name;
16     private Integer age;
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 getName() {
26         return name;
27     }
28     public void setName(String name) {
29         this.name = name;
30     }
31     public Integer getAge() {
32         return age;
33     }
34     public void setAge(Integer age) {
35         this.age = age;
36     }
37 }

Order类

 1 package com.shore.model;
 2 
 3 import javax.persistence.Entity;
 4 import javax.persistence.Id;
 5 import javax.persistence.JoinColumn;
 6 import javax.persistence.ManyToOne;
 7 import javax.persistence.Table;
 8 
 9 /**
10  * @author DSHORE/2019-9-19
11  * 多对一，单向关联（注解版）
12  */
13 @Entity
14 @Table(name="anno_order") //Order是MySQL数据库关键字。需重新定义表名
15 public class Order {//订单  （“多”的一方），在多的一方加外键
16     private Integer id;
17     private String number;
18     private Float sum;
19     private Customer customer; //映射外键【看他的getCustomer()方法处】
20     
21     @Id
22     public Integer getId() {
23         return id;
24     }
25     public void setId(Integer id) {
26         this.id = id;
27     }
28     public String getNumber() {
29         return number;
30     }
31     public void setNumber(String number) {
32         this.number = number;
33     }
34     public Float getSum() {
35         return sum;
36     }
37     public void setSum(Float sum) {
38         this.sum = sum;
39     }
40     
41     @ManyToOne   //多对一
42     @JoinColumn(name="customerId") //外键
43     public Customer getCustomer() {
44         return customer;
45     }
46     public void setCustomer(Customer customer) {
47         this.customer = customer;
48     }
49 }

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         
 9         <property name="connection.driver_class">com.mysql.jdbc.Driverproperty>
10         <property name="connection.url">jdbc:mysql://localhost:3306/hibernateproperty>
11         <property name="connection.username">rootproperty>
12         <property name="connection.password">rootproperty>
13 
14         <property name="dialect">org.hibernate.dialect.MySQLDialectproperty>
15         <property name="cache.provider_class">org.hibernate.cache.NoCacheProviderproperty>
16         <property name="show_sql">trueproperty>
17         <property name="hbm2ddl.auto">createproperty>
18 
19         <mapping class="com.shore.model.Customer" />
20         <mapping class="com.shore.model.Order" />
21     session-factory>
22 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         new SchemaExport(new AnnotationConfiguration().configure()).create(
15                 false, true);
16     }
17 }

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 /**
 4  * @author DSHORE/2019-9-19
 5  * 多对一，单向关联（xml版）
 6  */
 7 public class Customer {//顾客  （“一”的一方）
 8     private Integer id;
 9     private String name;
10     private Integer age;
11     
12     public Integer getId() {
13         return id;
14     }
15     public void setId(Integer id) {
16         this.id = id;
17     }
18     public String getName() {
19         return name;
20     }
21     public void setName(String name) {
22         this.name = name;
23     }
24     public Integer getAge() {
25         return age;
26     }
27     public void setAge(Integer age) {
28         this.age = age;
29     }
30 }

Order类

 1 package com.shore.model;
 2 
 3 /**
 4  * @author DSHORE/2019-9-19
 5  * 多对一，单向关联（xml版）
 6  */
 7 public class Order {//订单  （“多”的一方），在多的一方加外键
 8     private Integer id;
 9     private String number;
10     private Float sum;
11     private Customer customer; //映射外键【看他的Order.hbm.xml配置文件对应的字段customer处】
12     
13     public Integer getId() {
14         return id;
15     }
16     public void setId(Integer id) {
17         this.id = id;
18     }
19     public String getNumber() {
20         return number;
21     }
22     public void setNumber(String number) {
23         this.number = number;
24     }
25     public Float getSum() {
26         return sum;
27     }
28     public void setSum(Float sum) {
29         this.sum = sum;
30     }
31     public Customer getCustomer() {
32         return customer;
33     }
34     public void setCustomer(Customer customer) {
35         this.customer = customer;
36     }
37 }

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     class>
14 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         
14         
15         <many-to-one name="customer" column="customerId"/>
16     class>
17 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         
 9         <property name="connection.driver_class">com.mysql.jdbc.Driverproperty>
10         <property name="connection.url">jdbc:mysql://localhost:3306/hibernateproperty>
11         <property name="connection.username">rootproperty>
12         <property name="connection.password">rootproperty>
13 
14         <property name="dialect">org.hibernate.dialect.MySQLDialectproperty>
15         <property name="cache.provider_class">org.hibernate.cache.NoCacheProviderproperty>
16         <property name="show_sql">trueproperty>
17         <property name="hbm2ddl.auto">createproperty>
18 
19         
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：

 　　　　

 

 

 

 

 

 

 

 

原创作者：DSHORE 作者主页：http://www.cnblogs.com/dshore123/ 原文出自：https://www.cnblogs.com/dshore123/p/11553213.html 欢迎转载，转载务必说明出处。（如果本文对您有帮助，可以点击一下右下角的 推荐，或评论，谢谢！）