Hibernate，JPA注解@OneToMany_Map

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 }

环境：JDK1.6，MAVEN，tomcat，eclipse

源码地址：http://files.cnblogs.com/files/xiluhua/hibernate%40OneToMany_Map.rar

时间： 2024-12-31 10:44:40

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