HibernateDemo

Hibernate是当前最流行的ORM框架,ORM即Object/Relation Mapping, 对象关系数据库映射。

ORM是一种规范:完成面向对象语言到关系数据库的映射。

 

本文将演示一个最简单的demo,完成往数据库中添加记录的功能。

 

准备工作:

本文采用Hibernate 3.6.0版本,用到的jar包如下图:

 

一个典型的Hibernate Demo应该包含一下三个文件:

  1. PO,持久化对象。利用它可完成持久化操作。Hibearnate是低侵入式的设计,只需一个POJO(普通java对象)即可,无需继承任何父类和接口。

  2. *.hbm.xml。POJO与数据库表之间的映射配置文件。

  3. *.cfg.xml。Hibernate的配置文件,包括数据库驱动、URL、用户名、密码等信息。

 

数据库表:

use hibernateDemo;
drop table if exists TMP_EMP;

create table TMP_EMP (
  ID       int(4) primary key,
  NAME     VARCHAR(50),
  BIRTHDAY DATE,
  SEX      CHAR(1),
  SALARY   float(8,2)
);

 

POJO:

 1 // default package
 2 // Generated 2013-4-29 17:04:49 by Hibernate Tools 3.4.0.CR1
 3 
 4 import java.util.Date;
 5 
 6 /**
 7  * TmpEmp generated by hbm2java
 8  */
 9 public class TmpEmp implements java.io.Serializable {
10 
11     private int id;
12     private String name;
13     private Date birthday;
14     private Character sex;
15     private Float salary;
16 
17     public TmpEmp() {
18     }
19 
20     public TmpEmp(int id) {
21         this.id = id;
22     }
23 
24     public TmpEmp(int id, String name, Date birthday, Character sex,
25             Float salary) {
26         this.id = id;
27         this.name = name;
28         this.birthday = birthday;
29         this.sex = sex;
30         this.salary = salary;
31     }
32 
33     public int getId() {
34         return this.id;
35     }
36 
37     public void setId(int id) {
38         this.id = id;
39     }
40 
41     public String getName() {
42         return this.name;
43     }
44 
45     public void setName(String name) {
46         this.name = name;
47     }
48 
49     public Date getBirthday() {
50         return this.birthday;
51     }
52 
53     public void setBirthday(Date birthday) {
54         this.birthday = birthday;
55     }
56 
57     public Character getSex() {
58         return this.sex;
59     }
60 
61     public void setSex(Character sex) {
62         this.sex = sex;
63     }
64 
65     public Float getSalary() {
66         return this.salary;
67     }
68 
69     public void setSalary(Float salary) {
70         this.salary = salary;
71     }
72 
73 }

 

hibernate.cfg.xml

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
 3                                          "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
 4 <hibernate-configuration>
 5  <session-factory name="">
 6   <property name="hibernate.connection.driver_class">org.gjt.mm.mysql.Driver</property>
 7   <property name="hibernate.connection.password">wailiee</property>
 8   <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/HibernateDemo</property>
 9   <property name="hibernate.connection.username">root</property>
10   <property name="hibernate.dialect">org.hibernate.dialect.MySQLInnoDBDialect</property>
11   <mapping resource="TmpEmp.hbm.xml"/>
12  </session-factory>
13 </hibernate-configuration>

 

TmpEmp.hbm.xml

 1 <?xml version="1.0"?>
 2 <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
 3 "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
 4 <!-- Generated 2013-4-29 17:07:22 by Hibernate Tools 3.4.0.CR1 -->
 5 <hibernate-mapping>
 6     <class name="TmpEmp" table="TMP_EMP">
 7         <id name="id" type="int">
 8             <column name="ID" />
 9             <!-- 指定主键生成策略 -->
10             <generator class="assigned" />
11         </id>
12         <property name="name" type="java.lang.String">
13             <column name="NAME" />
14         </property>
15         <property name="birthday" type="java.util.Date">
16             <column name="BIRTHDAY" />
17         </property>
18         <property name="sex" type="java.lang.Character">
19             <column name="SEX" />
20         </property>
21         <property name="salary" type="java.lang.Float">
22             <column name="SALARY" />
23         </property>
24     </class>
25 </hibernate-mapping>

 

Client

 1 import org.hibernate.Session;
 2 import org.hibernate.SessionFactory;
 3 import org.hibernate.Transaction;
 4 import org.hibernate.cfg.Configuration;
 5 
 6 
 7 public class Client0 {
 8 
 9     /**
10      * @param args
11      */
12     public static void main(String[] args) {
13         // TODO Auto-generated method stub
14         Configuration conf = new Configuration();
15         // 下面的方法默认加载hibernate.cfg.xml文件
16         conf.configure();
17         
18         // 创建sessionFactory
19         SessionFactory sf = conf.buildSessionFactory();
20         // 创建session
21         Session sess = sf.openSession();
22         // 开始事务,Hibernate必须显式的手动提交事务
23         Transaction tx = sess.beginTransaction();
24         
25         TmpEmp tmpEmp = new TmpEmp();
26         tmpEmp.setId(5);
27         tmpEmp.setName("yz");
28         
29         // 保存
30         sess.save(tmpEmp);
31         
32         // 提交事务
33         tx.commit();
34         
35         // 关闭session
36         sess.flush();
37         sess.close();
38         sf.close();
39     }
40 
41 }

 

运行结果:

posted @ 2013-05-05 15:18  Alex_Monkey  阅读(2231)  评论(0编辑  收藏  举报