hibernate3.5 HelloWorld Annotation(1.2)

由于版本的不同，项目中需要引入的jar的也会相应的不同，这个可以根据错误提示来相应的加入jar包。

project工程目录以及jar包(除了ejb-persistence.jar需要自己手动下载，其他jar包hibernate压缩包中都可以找到)如下：

ejb3-persistence.jar下载地址：http://www.java2s.com/Code/Jar/e/Downloadejb3persistencejar.htm

 

1.Teacher.java

package com.bjsxt.model;

import javax.persistence.Entity;
import javax.persistence.Id;

/**1.注意：这里不能使用@org.hibernate.annotations.Entity。
 *2.查看：javax.persistence.Entity与org.hibernate.annotations.Entity的区别 
 *3.从Entity所在包可以知道Annotaion不依赖hibernate
*/
//@Entity说明Teacher是实体类
@Entity
public class Teacher {
	
	private int id;
	
	private String name;
	
	private int age;
        
    //@Id说明属性id是主键
	@Id
	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}
	

}

 2.在数据库创建于Teacher对应的表，表结构如下：

create table teacher(
      id number primary key,
      name varchar2(20),
      age number(3)
)

 

3.建立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">

<hibernate-configuration>

    <session-factory>

        <!-- Database connection settings -->
        <property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
        <property name="connection.url">jdbc:oracle:thin:@localhost:1521:ORCL</property>
        <property name="connection.username">system</property>
        <property name="connection.password">niit</property>

        <!-- JDBC connection pool (use the built-in) -->
        <!-- <property name="connection.pool_size">1</property> -->

        <!-- SQL dialect -->
        <property name="dialect">org.hibernate.dialect.OracleDialect</property>

        <!-- Enable Hibernate's automatic session context management -->
        <!--<property name="current_session_context_class">thread</property> -->

        <!-- Disable the second-level cache  -->
        <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>

        <!-- Echo all executed SQL to stdout -->
        <property name="show_sql">true</property>

        <!-- Drop and re-create the database schema on startup -->
        <!--<property name="hbm2ddl.auto">update</property>-->

        <!-- <mapping resource="org/hibernate/tutorial/domain/Event.hbm.xml"/>-->
        <mapping class="com.bjsxt.model.Teacher"/><!--annotation-->
    </session-factory>

</hibernate-configuration>

 4.建立测试类

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

import com.bjsxt.model.Teacher;

public class TeacherTest {
	public static void main(String[] args) {
		Teacher s = new Teacher();
		s.setId(1);
		s.setName("t1");
		s.setAge(22);
		
		//注意：这个要使用AnnotationConfiguration,而不是Configuration
		Configuration cfg = new AnnotationConfiguration();

		SessionFactory sf = cfg.configure().buildSessionFactory();

		Session session = sf.openSession();// 拿到session
		session.beginTransaction();// 还回值可以不用存起来
		
		session.save(s);
		session.getTransaction().commit();
		session.close();
		sf.close();
	}
}