Hibernate，JPA注解@SecondaryTables

浏览数：45 / 时间：2015年06月09日

使用类一级的 @SecondaryTable或@SecondaryTables注解可以实现单个实体到多个表的映射. 使用 @Column或者 @JoinColumn注解中的table参数可指定某个列所属的特定表.

用例代码如下：

数据库DDL语句

1，CAT表

 1 create table CAT
 2 (
 3   id          VARCHAR2(32 CHAR) not null,
 4   create_time TIMESTAMP(6),
 5   update_time TIMESTAMP(6),
 6   cat_name    VARCHAR2(255 CHAR),
 7   first_name  VARCHAR2(255 CHAR),
 8   last_name   VARCHAR2(255 CHAR),
 9   version     NUMBER(10) not null
10 )

2，CAT_INFO表

1 create table CAT_INFO
2 (
3   address  VARCHAR2(255 CHAR),
4   birthday TIMESTAMP(6),
5   cat_id   VARCHAR2(32 CHAR) not null
6 )

3，CAT_INFO_2表

1 create table CAT_INFO_2
2 (
3   gender NUMBER(10),
4   mobile VARCHAR2(255 CHAR),
5   cat_id VARCHAR2(32 CHAR) not null
6 )

hibernate.cfg.xml

 1 <?xml version="1.0" encoding="utf-8" ?>
 2 <!DOCTYPE hibernate-configuration
 3  PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN"
 4  "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
 5 <hibernate-configuration>
 6     <session-factory>
 7         <!-- 数据库驱动配置 -->
 8         <property name="dialect">org.hibernate.dialect.Oracle10gDialect</property>
 9         <property name="connection.driver_class">oracle.jdbc.OracleDriver</property>
10         <property name="connection.url">jdbc:oracle:thin:@127.0.0.1:1521:orcl</property>
11         <property name="connection.username">wxuatuser</property>
12         <property name="connection.password">xlh</property>
13         <property name="show_sql">true</property>
14         <!-- 自动执行DDL属性是update，不是true -->
15         <property name="hbm2ddl.auto">update</property>
16         <!-- hibernate实体类 -->
17         
18         <mapping class="a6_SecondaryTable.CatSecondaryTables"/>
19         
20     </session-factory>
21 </hibernate-configuration>

java类

实体类 - 基类

 1 package model;
 2 import java.io.Serializable;
 3 import java.util.Date;
 4 import javax.persistence.Column;
 5 import javax.persistence.GeneratedValue;
 6 import javax.persistence.Id;
 7 import javax.persistence.MappedSuperclass;
 8 import org.hibernate.annotations.GenericGenerator;
 9 /**
10  * 实体类 - 基类
11  */
12 @MappedSuperclass
13 public class BaseEntity implements Serializable {
14 
15     private static final long serialVersionUID = -6718838800112233445L;
16 
17     private String id;// ID
18     private Date create_time;// 创建日期
19     private Date update_time;// 修改日期
20     @Id
21     @Column(length = 32, nullable = true)
22     @GeneratedValue(generator = "uuid")
23     @GenericGenerator(name = "uuid", strategy = "uuid")
24     public String getId() {
25         return id;
26     }
27     public void setId(String id) {
28         this.id = id;
29     }
30     @Column(updatable = false)
31     public Date getCreate_time() {
32         return create_time;
33     }
34     public void setCreate_time(Date create_time) {
35         this.create_time = create_time;
36     }
37     public Date getUpdate_time() {
38         return update_time;
39     }
40     public void setUpdate_time(Date update_time) {
41         this.update_time = update_time;
42     }
43     @Override
44     public int hashCode() {
45         return id == null ? System.identityHashCode(this) : id.hashCode();
46     }
47     @Override
48     public boolean equals(Object obj) {
49         if (this == obj) {
50             return true;
51         }
52         if (obj == null) {
53             return false;
54         }
55         if (getClass().getPackage() != obj.getClass().getPackage()) {
56             return false;
57         }
58         final BaseEntity other = (BaseEntity) obj;
59         if (id == null) {
60             if (other.getId() != null) {
61                 return false;
62             }
63         } else if (!id.equals(other.getId())) {
64             return false;
65         }
66         return true;
67     }
68 }

实体类

 1 package a6_SecondaryTable;
 2 import java.util.Date;
 3 import javax.persistence.AttributeOverride;
 4 import javax.persistence.AttributeOverrides;
 5 import javax.persistence.Column;
 6 import javax.persistence.Embedded;
 7 import javax.persistence.Entity;
 8 import javax.persistence.PrimaryKeyJoinColumn;
 9 import javax.persistence.SecondaryTable;
10 import javax.persistence.SecondaryTables;
11 import javax.persistence.Table;
12 import javax.persistence.Version;
13 import model.BaseEntity;
14 import org.hibernate.annotations.DynamicInsert;
15 import org.hibernate.annotations.DynamicUpdate;
16 
17 @Entity
18 @DynamicInsert
19 @DynamicUpdate
20 @Table(name="CAT")
21 @SecondaryTables( value = {
22         @SecondaryTable(name="CAT_INFO",pkJoinColumns=@PrimaryKeyJoinColumn(name="CAT_ID")),
23         @SecondaryTable(name="CAT_INFO_2",pkJoinColumns=@PrimaryKeyJoinColumn(name="CAT_ID")) })
24 public class CatSecondaryTables extends BaseEntity{
25     /**
26      * 实体类
27      */
28     private static final long serialVersionUID = -2776330321385582872L;
29 
30     private String cat_name;
31     private Name name;
32     private int version;
33     private String address;
34     private Date birthday;
35     private Integer gender;
36     private String mobile;
37     
38     @Version
39     public int getVersion() {
40         return version;
41     }
42 
43     public void setVersion(int version) {
44         this.version = version;
45     }
46 
47     public String getCat_name() {
48         return cat_name;
49     }
50 
51     public void setCat_name(String cat_name) {
52         this.cat_name = cat_name;
53     }
54 
55     @Embedded
56     @AttributeOverrides({
57             @AttributeOverride(name = "first_name", column = @Column(name = "first_name")),
58             @AttributeOverride(name = "last_name", column = @Column(name = "last_name")) })
59     public Name getName() {
60         return name;
61     }
62 
63     public void setName(Name name) {
64         this.name = name;
65     }
66     @Column(name="ADDRESS", table="CAT_INFO")  
67     public String getAddress() {
68         return address;
69     }
70 
71     public void setAddress(String address) {
72         this.address = address;
73     }
74     @Column(name="BIRTHDAY", table="CAT_INFO")  
75     public Date getBirthday() {
76         return birthday;
77     }
78 
79     public void setBirthday(Date birthday) {
80         this.birthday = birthday;
81     }
82     @Column(name="GENDER", table="CAT_INFO_2")  
83     public Integer getGender() {
84         return gender;
85     }
86 
87     public void setGender(Integer gender) {
88         this.gender = gender;
89     }
90     @Column(name="MOBILE", table="CAT_INFO_2")  
91     public String getMobile() {
92         return mobile;
93     }
94 
95     public void setMobile(String mobile) {
96         this.mobile = mobile;
97     }
98 }

Dao

 1 package daoUtil;
 2 import org.hibernate.HibernateException;
 3 import org.hibernate.Session;
 4 import org.hibernate.SessionFactory;
 5 import org.hibernate.Transaction;
 6 import org.hibernate.cfg.Configuration;
 7 import org.hibernate.service.ServiceRegistry;
 8 import org.hibernate.service.ServiceRegistryBuilder;
 9 
10 public class HibernateUtil {
11 
12     private static final SessionFactory sessionFactory;
13 
14     static {
15         try {
16             Configuration cfg = new Configuration().configure();
17             ServiceRegistry serviceRegistry = new ServiceRegistryBuilder()
18                     .applySettings(cfg.getProperties()).buildServiceRegistry();
19             sessionFactory = cfg.buildSessionFactory(serviceRegistry);
20         } catch (Throwable ex) {
21             throw new ExceptionInInitializerError(ex);
22         }
23     }
24 
25     public static Session getSession() throws HibernateException {
26         return sessionFactory.openSession();
27     }
28 
29     public static Object save(Object obj){
30         Session session = HibernateUtil.getSession();
31         Transaction tx = null;
32         try {
33             tx = session.beginTransaction();
34             session.save(obj);
35             tx.commit();
36         } catch (RuntimeException e) {
37             if (tx != null) {
38                 tx.rollback();
39             }
40             throw e;
41         } finally {
42             session.close();
43         }
44         return obj;
45     }
46     
47     public static void delete(Class<?> clazz,String id){
48         Session session = HibernateUtil.getSession();
49         Transaction tx = null;
50         try {
51             tx = session.beginTransaction();
52             Object obj = session.get(clazz,id);
53             session.delete(obj);
54             tx.commit();
55         } catch (RuntimeException e) {
56             if (tx != null) {
57                 tx.rollback();
58             }
59             throw e;
60         } finally {
61             session.close();
62         }
63     }
64 }

main

 1 package a6_SecondaryTable;
 2 import java.util.Date;
 3 import daoUtil.HibernateUtil;
 4 
 5 public class Test_SecondaryTables {
 6 
 7     public static void main(String[] args) {
 8         
 9         Name name = new Name();
10         CatSecondaryTables cat = new CatSecondaryTables();
11         cat.setCat_name("test7SecondaryTables2");
12         cat.setName(name);
13         cat.setAddress("中华人民共和国");
14         cat.setBirthday(new Date());
15         cat.setGender(1);
16         cat.setMobile("13012345678");
17         
18         HibernateUtil.save(cat);
19         System.out.println(cat.getId());
20         
21         CatSecondaryTables cat1 = (CatSecondaryTables)HibernateUtil.getSession().get(CatSecondaryTables.class, cat.getId());
22         System.out.println(cat1.getId());
23     }
24 }