引自：http://www.cnblogs.com/hongten/archive/2011/07/20/2111773.html

进入：http://www.hibernate.org

说明文档：

英文：http://docs.jboss.org/hibernate/annotations/3.5/reference/en/html_single/

中文：http://docs.jboss.org/hibernate/annotations/3.4/reference/zh_cn/html_single/

下载：hibernate annotation 3.4.0 GA

得到：hibernate-annotations.jar

　　　hibernate-commons-annotation.jar

　　　ejb3-persistence.jar

数据库：mysql

category表：id，name，description  
    id

product表：id,name ,price, description ,category_id
     
     
     id
 category_id

新建java project项目：

Add Hibernate Capabilities

hibernate.cfg.xml

 1

 2

 3    
     
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"

 4    
     
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

 5 

 6

 7

 8 

 9  

10  

11  
 org.hibernate.dialect.MySQLDialect

12  

13  

14  
 jdbc:mysql://localhost:3307/users

15  

16   root

17   root

18  

19  
 com.mysql.jdbc.Driver

20  

21  

22    mysqlusers

23  

24   true

25   true

26   thread

27  

28  

29 

30  

31 

32

利用Hibernate的逆向工程生成：

Category.java    
 and    
     
Product.java   

Category.java

 1 package com.b510.examples;

 2 

 3 import java.util.HashSet;

 4 import java.util.Set;

 5 

 6 // 标准注解

 7 

 8 import
javax.persistence.CascadeType;

 9 import javax.persistence.Column;

10 import javax.persistence.Entity;

11 import javax.persistence.FetchType;

12 import javax.persistence.GeneratedValue;

13 import javax.persistence.Id;

14 import javax.persistence.OneToMany;

15 import javax.persistence.Table;

16 

17 //增加的注解

18 

19 import org.hibernate.annotations.GenericGenerator;

20 

21 //当前的类是一个持久化类，是Category这个类。他映射了一个表category。所对应的
数据库是users

22 //这句：@Table(name = "category", catalog = "users")
 可以省略

23 @Entity

24 @Table(name = "category", catalog = "users")

25 

26 public class Category implements java.io.Serializable
{

27 

28  private static final long
serialVersionUID = 3240281547213597385L;

29  private Integer id;

30  private String name;

31  private String description;

32  private Set products = new
HashSet(0);

33 

34  

35  public Category() {

36  }

37 

38  public Category(String name, String
description, Set products) {

39   this.name = name;

40   this.description = description;

41   this.products = products;

42  }

43 

44  // 主键 ：@Id  
 主键生成方式：strategy = "increment"

45  //映射表中id这个字段，不能为空，并且是唯一的

46  @GenericGenerator(name = "generator",
strategy = "increment")

47  @Id

48  @GeneratedValue(generator =
"generator")

49  @Column(name = "id", unique = true,
nullable = false)

50  public Integer getId() {

51   return this.id;

52  }

53 

54  public void setId(Integer id) {

55   this.id = id;

56  }

57 

58  //映射表中name这个字段 ，长度是500

59  @Column(name = "name", length =
500)

60  public String getName() {

61   return this.name;

62  }

63 

64  public void setName(String name) {

65   this.name = name;

66  }

67  

68  //映射表中description这个字段 ，长度是500

69  @Column(name = "description", length =
500)

70  public String getDescription() {

71   return this.description;

72  }

73 

74  public void setDescription(String
description) {

75   this.description = description;

76  }

77 

78  //级联操作：cascade = CascadeType.ALL

79  //延迟加载：fetch = FetchType.LAZY

80  //映射：mappedBy = "category"

81  //一对多方式

82  @OneToMany(cascade = CascadeType.ALL,
fetch = FetchType.LAZY, mappedBy = "category")

83  public Set getProducts() {

84   return this.products;

85  }

86 

87  public void setProducts(Set products)
{

88   this.products = products;

89  }

90 

91 }

Product.java

 1 package com.b510.examples;

 2 

 3 import javax.persistence.Column;

 4 import javax.persistence.Entity;

 5 import javax.persistence.FetchType;

 6 import
javax.persistence.GeneratedValue;

 7 import javax.persistence.Id;

 8 import javax.persistence.JoinColumn;

 9 import javax.persistence.ManyToOne;

10 import javax.persistence.Table;

11 import org.hibernate.annotations.GenericGenerator;

12 

13 

14 @Entity

15 @Table(name = "product", catalog = "users")

16 public class Product implements java.io.Serializable
{

17 

18  private static final long
serialVersionUID = -1546206493725028472L;

19  private Integer id;

20  private Category category;

21  private String name;

22  private String price;

23  private String descripton;

24 

25  

26  public Product() {

27  }

28 

29  public Product(Category category, String
name, String price,

30    String descripton)
{

31   this.category = category;

32   this.name = name;

33   this.price = price;

34   this.descripton = descripton;

35  }

36  

37  @GenericGenerator(name = "generator",
strategy = "increment")

38  @Id

39  @GeneratedValue(generator =
"generator")

40  @Column(name = "id", unique = true,
nullable = false)

41  public Integer getId() {

42   return this.id;

43  }

44 

45  public void setId(Integer id) {

46   this.id = id;

47  }

48 

49  //延迟加载：多对一方式

50  //关联信息：外键name = "category_id"

51  @ManyToOne(fetch = FetchType.LAZY)

52  @JoinColumn(name = "category_id")

53  public Category getCategory() {

54   return this.category;

55  }

56 

57  public void setCategory(Category
category) {

58   this.category = category;

59  }

60 

61  @Column(name = "name", length =
500)

62  public String getName() {

63   return this.name;

64  }

65 

66  public void setName(String name) {

67   this.name = name;

68  }

69 

70  @Column(name = "price", length =
10)

71  public String getPrice() {

72   return this.price;

73  }

74 

75  public void setPrice(String price)
{

76   this.price = price;

77  }

78 

79  @Column(name = "descripton", length =
500)

80  public String getDescripton() {

81   return this.descripton;

82  }

83 

84  public void setDescripton(String
descripton) {

85   this.descripton = descripton;

86  }

87 

88 }

测试代码：

HibernateTest.java

 1

 4 package com.b510.examples;

 5 

 6 import java.util.Set;

 7 

 8 import org.hibernate.Session;

 9 import org.hibernate.SessionFactory;

10 import org.hibernate.cfg.AnnotationConfiguration;

11 import org.hibernate.cfg.Configuration;

12 

13

20 public class HibernateTest {

21 

22  public static void main(String[] args)
{

23   HibernateTest test=new
HibernateTest();

24   test.add();

25   test.find();

26  }

27  public void add(){

28  Configuration config=new
AnnotationConfiguration();

29  config.configure();

30  SessionFactory
sessionFactory=config.buildSessionFactory();

31  Session
session=sessionFactory.getCurrentSession();

32  session.beginTransaction();

33  Category
c=(Category)session.get(Category.class, 5);

34  

35  Product p=new Product();

36  p.setName("计算机科学与技术");

37  p.setPrice("123");

38
 p.setDescripton("计算机科学与技术,好啊，真是红啊");

39  

40  p.setCategory(c);

41  c.getProducts().add(p);

42  

43  session.save(p);

44  session.getTransaction().commit();

45  }

46  

47  

48  public void find(){

49   Configuration config=new
AnnotationConfiguration();

50   config.configure();

51   SessionFactory
sessionFactory=config.buildSessionFactory();

52   Session
session=sessionFactory.getCurrentSession();

53   session.beginTransaction();

54   Category
c=(Category)session.get(Category.class, 5);

55  
 System.out.println("id: "+c.getId()+"
 name:"+c.getName());

56    Set
p=c.getProducts();

57    for(Product
product:p){

58    
System.out.println("id:"+product.getId()+"
 name:"+product.getName()+"
 description:"+product.getDescripton());

59    }

60  
 session.getTransaction().commit();

61  }

62 }

运行效果：

 1 log4j:WARN No appenders could be found for
logger (org.hibernate.cfg.annotations.Version).

 2 log4j:WARN Please initialize the log4j
system properly.

 3 Hibernate: 

 4    
select

 5    
    category0_.id as
id1_0_,

 6    
    category0_.description as
descript2_1_0_,

 7    
    category0_.name as
name1_0_ 

 8    
from

 9    
    users.category
category0_ 

10     where

11      
  category0_.id=?

12 Hibernate: 

13     select

14      
  products0_.category_id as category5_1_,

15      
  products0_.id as id1_,

16      
  products0_.id as id0_0_,

17      
  products0_.category_id as category5_0_0_,

18      
  products0_.descripton as descripton0_0_,

19      
  products0_.name as name0_0_,

20      
  products0_.price as
price0_0_ 

21     from

22      
  users.product products0_ 

23     where

24      
  products0_.category_id=?

25 Hibernate: 

26     select

27      
  max(id) 

28     from

29      
  product

30 Hibernate: 

31    
insert 

32     into

33      
  users.product

34      
  (category_id, descripton, name, price,
id) 

35     values

36      
  (?, ?, ?, ?, ?)

37 Hibernate: 

38     select

39      
  category0_.id as id5_0_,

40      
  category0_.description as descript2_5_0_,

41      
  category0_.name as
name5_0_ 

42     from

43      
  users.category
category0_ 

44     where

45      
  category0_.id=?

46 id: 5  name:xml33

47 Hibernate: 

48     select

49      
  products0_.category_id as category5_1_,

50      
  products0_.id as id1_,

51      
  products0_.id as id4_0_,

52      
  products0_.category_id as category5_4_0_,

53      
  products0_.descripton as descripton4_0_,

54      
  products0_.name as name4_0_,

55      
  products0_.price as
price4_0_ 

56     from

57      
  users.product products0_ 

58     where

59      
  products0_.category_id=?

60 id:9  name:计算机科学与技术
 description:计算机科学与技术,好啊，真是红啊

 

分类: Hibernate

标签: java, hibernate, annotation, 注解

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