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
create table CAT ( id VARCHAR2(32 CHAR) not null, create_time TIMESTAMP(6), update_time TIMESTAMP(6), cat_name VARCHAR2(255 CHAR), first_name VARCHAR2(255 CHAR), last_name VARCHAR2(255 CHAR), version NUMBER(10) not null )
2，CAT_INFO表
create table CAT_INFO ( address VARCHAR2(255 CHAR), birthday TIMESTAMP(6), cat_id VARCHAR2(32 CHAR) not null )
- 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.Cat"/> 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.Version;
11 import model.BaseEntity;
12 import org.hibernate.annotations.DynamicInsert;
13 import org.hibernate.annotations.DynamicUpdate;
14
15 @Entity
16 @DynamicInsert
17 @DynamicUpdate
18 @SecondaryTable(name="CAT_INFO",pkJoinColumn[email protected](name="CAT_ID"))
19 public class Cat extends BaseEntity{
20 /**
21 * 实体类
22 */
23 private static final long serialVersionUID = -2776330321385582872L;
24
25 private String cat_name;
26 private Name name;
27 private int version;
28 private String address;
29 private Date birthday;
30
31 @Version
32 public int getVersion() {
33 return version;
34 }
35
36 public void setVersion(int version) {
37 this.version = version;
38 }
39
40 public String getCat_name() {
41 return cat_name;
42 }
43
44 public void setCat_name(String cat_name) {
45 this.cat_name = cat_name;
46 }
47
48 @Embedded
49 @AttributeOverrides({
50 @AttributeOverride(name = "first_name", column = @Column(name = "first_name")),
51 @AttributeOverride(name = "last_name", column = @Column(name = "last_name")) })
52 public Name getName() {
53 return name;
54 }
55
56 public void setName(Name name) {
57 this.name = name;
58 }
59 @Column(name="ADDRESS", table="CAT_INFO")
60 public String getAddress() {
61 return address;
62 }
63
64 public void setAddress(String address) {
65 this.address = address;
66 }
67 @Column(name="BIRTHDAY", table="CAT_INFO")
68 public Date getBirthday() {
69 return birthday;
70 }
71
72 public void setBirthday(Date birthday) {
73 this.birthday = birthday;
74 }
75 }
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 daoUtil.HibernateUtil;
3
4 public class Test_SecondaryTable {
5
6 public static void main(String[] args) {
7
8 Name name = new Name();
9 Cat cat = new Cat();
10 cat.setCat_name("test7SecondaryTable1");
11 cat.setName(name);
12 cat.setAddress("中华人民共和国");
13 HibernateUtil.save(cat);
14 System.out.println(cat.getId());
15
16 Cat cat1 = (Cat)HibernateUtil.getSession().get(Cat.class, cat.getId());
17 System.out.println(cat1.getId());
18 }
19 }
环境：JDK1.6，MAVEN，tomcat，eclipse
源码地址：http://files.cnblogs.com/files/xiluhua/hibernate%40SecondaryTable.rar
时间： 2024-10-13 08:56:52