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.
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 }
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