Hibernate之---实体映射

最新推荐文章于 2024-08-05 14:34:00 发布

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本文介绍了一个使用MyEclipse与Hibernate框架整合的例子，包括配置文件hibernate.cfg.xml、映射文件Person.hbm.xml及Java代码实现。通过这个示例可以了解如何将MyEclipse与Hibernate结合使用来操作SQL Server数据库。

转载：http://hi.baidu.com/javajavajava/blog


此示例使用myeclipse5.5+Sql 2000数据库

数据库脚本:
CREATE TABLE person (
id int NOT NULL    PRIMARY KEY ,
firstname varchar (20) NOT NULL,
lastname varchar (20) NOT NULL ,
address varchar (20) NOT NULL ,
zipcode varchar (6) NOT NULL ,
tel varchar (20)
) 

hibernate.cfg.xml

<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
             "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
             "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<!-- Generated by MyEclipse Hibernate Tools.                      -->
<hibernate-configuration>

<session-factory>
<property name="connection.username">sa</property>
<property name="connection.url">
    jdbc:microsoft:sqlserver://localhost:1433
</property>
<property name="dialect">
     org.hibernate.dialect.SQLServerDialect
</property>
<property name="myeclipse.connection.profile">mysql2000</property>
<property name="connection.password">sa</property>
<property name="connection.driver_class">
     com.microsoft.jdbc.sqlserver.SQLServerDriver
</property>
<property name="show_sql">true</property>
<mapping resource="org/myhibernate/demo01/Person.hbm.xml" />

</session-factory>

</hibernate-configuration>

Person.hbm.xml

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- 
Mapping file autogenerated by MyEclipse Persistence Tools
-->
<hibernate-mapping>
<class name="org.myhibernate.demo01.Person" table="person"
    schema="dbo" catalog="mldn">
     <id name="id" type="java.lang.Integer">
      <column name="id" />
      <generator class="assigned" />
     </id>
     <component name="name" class="org.myhibernate.demo01.Name">
      <property name="firstname" type="java.lang.String">
       <column name="firstname" length="20" not-null="true" />
      </property>
      <property name="lastname" type="java.lang.String">
       <column name="lastname" length="20" not-null="true" />
      </property>
     </component>
     <component name="contact"
      class="org.myhibernate.demo01.Contact">
      <property name="address" type="java.lang.String">
       <column name="address" length="20" not-null="true" />
      </property>
      <property name="zipcode" type="java.lang.String">
       <column name="zipcode" length="6" not-null="true" />
      </property>
      <property name="tel" type="java.lang.String">
       <column name="tel" length="20" />
      </property>
     </component>
</class>
</hibernate-mapping>


Person.java

package org.myhibernate.demo01;

public class Person {

private int id;
private Name name;
private Contact contact;
// Getter/Setter方法
}

Name.java
package org.myhibernate.demo01;

public class Name {

private String firstname;

private String lastname;

// Getter/Setter方法
}

Contact.java
package org.myhibernate.demo01;

public class Contact {

private String address;

private String zipcode;

private String tel;

// Getter/Setter方法

}


PersonDAO.java
package org.myhibernate.demo01;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class PersonDAO {

private Session session;

public PersonDAO() {
     Configuration config = new Configuration().configure();
     SessionFactory factory = config.buildSessionFactory();
     this.session = factory.openSession();
}

public void insert(Person p){
     this.session.save(p);
     this.session.beginTransaction().commit();
}
}

TestPerson.java

package org.myhibernate.demo01;

public class TestPerson {
public static void main(String[] args) {
     Person p = new Person();
     PersonDAO pdao = new PersonDAO();
     Name name = new Name();
     Contact contact = new Contact();

     name.setFirstname("胡");
     name.setLastname("千好");

     contact.setAddress("云南宣威");
     contact.setTel("13888888888");
     contact.setZipcode("655408");

     p.setId(1);
     p.setContact(contact);
     p.setName(name);

     pdao.insert(p);
}
}