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，HOBBY表
1 create table HOBBY
2 (
3 id VARCHAR2(32 CHAR) not null,
4 create_time TIMESTAMP(6),
5 update_time TIMESTAMP(6),
6 name VARCHAR2(255 CHAR),
7 cat_id VARCHAR2(32 CHAR)
8 )
- 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="b10_OneToMany_Map.Cat"/>
19 <mapping class="b10_OneToMany_Map.Hobby"/>
20
21 </session-factory>
22 </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
Cat.java
1 package b10_OneToMany_Map;
2 import java.util.Map;
3 import javax.persistence.AttributeOverride;
4 import javax.persistence.AttributeOverrides;
5 import javax.persistence.CascadeType;
6 import javax.persistence.Column;
7 import javax.persistence.Embedded;
8 import javax.persistence.Entity;
9 import javax.persistence.FetchType;
10 import javax.persistence.MapKey;
11 import javax.persistence.OneToMany;
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 public class Cat extends BaseEntity{
21 /**
22 * 实体类
23 */
24 private static final long serialVersionUID = -2776330321385582872L;
25
26 private Map<String,Hobby> hobbies;
27
28 private String cat_name;
29 private Name name;
30 private int version;
31
32 @Version
33 public int getVersion() {
34 return version;
35 }
36
37 public void setVersion(int version) {
38 this.version = version;
39 }
40
41 public String getCat_name() {
42 return cat_name;
43 }
44
45 public void setCat_name(String cat_name) {
46 this.cat_name = cat_name;
47 }
48
49 @Embedded
50 @AttributeOverrides({
51 @AttributeOverride(name = "first_name", column = @Column(name = "first_name")),
52 @AttributeOverride(name = "last_name", column = @Column(name = "last_name")) })
53 public Name getName() {
54 return name;
55 }
56
57 public void setName(Name name) {
58 this.name = name;
59 }
60 /*
61 * mappedBy属性：
62 * 如果关系是单向的，则该关联提供程序确定拥有该关系的字段。
63 * 如果关系是双向的，则将关联相反（非拥有）方上的 mappedBy 元素设置为拥
64 * 有此关系的字段或属性的名称
65 */
66 @OneToMany(mappedBy = "cat", cascade = { CascadeType.ALL }, fetch = FetchType.EAGER)
67 @MapKey(name="id")
68 public Map<String, Hobby> getHobbies() {
69 return hobbies;
70 }
71
72 public void setHobbies(Map<String, Hobby> hobbies) {
73 this.hobbies = hobbies;
74 }
75 }
Hobby.java
1 package b10_OneToMany_Map;
2 import javax.persistence.Entity;
3 import javax.persistence.JoinColumn;
4 import javax.persistence.ManyToOne;
5 import model.BaseEntity;
6
7 @Entity
8 public class Hobby extends BaseEntity {
9 /**
10 * 实体类
11 */
12 private static final long serialVersionUID = 4921844599282935594L;
13
14 private String name;
15 private Cat cat;
16
17 public String getName() {
18 return name;
19 }
20 public void setName(String name) {
21 this.name = name;
22 }
23 @ManyToOne
24 @JoinColumn(name = "CAT_ID")
25 public Cat getCat() {
26 return cat;
27 }
28 public void setCat(Cat cat) {
29 this.cat = cat;
30 }
31 }
组件类
1 package b10_OneToMany_Map;
2 import java.io.Serializable;
3 import javax.persistence.Embeddable;
4
5 @Embeddable
6 public class Name implements Serializable {
7 /**
8 * 嵌入式组建
9 */
10 private static final long serialVersionUID = -2776330321385582872L;
11
12 private String first_name;
13 private String last_name;
14 public String getFirst_name() {
15 return first_name;
16 }
17 public void setFirst_name(String first_name) {
18 this.first_name = first_name;
19 }
20 public String getLast_name() {
21 return last_name;
22 }
23 public void setLast_name(String last_name) {
24 this.last_name = last_name;
25 }
26 }
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 b10_OneToMany_Map;
2 import java.util.HashMap;
3 import java.util.Map;
4 import daoUtil.HibernateUtil;
5
6 public class Test_OneToMany_Map {
7
8 private Cat save(){
9
10 Cat cat = new Cat();
11 cat.setCat_name("b10_OneToMany_Map");
12 cat.setName(new Name());
13
14 Map<String, Hobby> hobbies = new HashMap<String,Hobby>();
15 Hobby hobby1 = new Hobby();
16 hobby1.setName("足球");
17 hobbies.put("1",hobby1);
18
19 Hobby hobby2 = new Hobby();
20 hobby2.setName("篮球");
21 hobbies.put("2",hobby2);
22
23 cat.setHobbies(hobbies);
24 hobby1.setCat(cat);
25 hobby2.setCat(cat);
26
27 HibernateUtil.save(cat);
28 return cat;
29 }
30
31 public static void main(String[] args) {
32
33 Cat cat = new Test_OneToMany_Map().save();
34
35 Cat cat1 = (Cat)HibernateUtil.getSession().get(Cat.class, cat.getId());
36 System.out.println(cat1.getId());
37
38 Map<String, Hobby> map = cat1.getHobbies();
39 for (Map.Entry<String, Hobby> entry : map.entrySet()) {
40 System.out.println("key= " + entry.getKey() + " and value= " + entry.getValue().getName());
41 }
42 // delete
43 // HibernateUtil.delete(Cat.class,cat1.getId());
44 }
45 }
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