使用Annotation入门

1.在User Library 如：hibernate3.3中导入jar

 hibernate-annotations-3.4.0.GA\hibernate-annotations.jar;
 hibernate-annotations-3.4.0.GA\lib\ejb3-persistence.jar;
 hibernate-annotations-3.4.0.GA\lib\hibernate-commons-annotations.jar

 
2.新建表teacher

create table teacher (
 id int primary key,
 name varchar(20),
 title varchar(10)
 );

  
3.包com.fengyun.shopping.entity下建立Teacher类

package com.fengyun.shopping.entity;

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

@Entity
public class Teacher {
 private Integer id;
 private String name;
 private String title;
 
 public Teacher() {
  super();
 }
 @Id
 public Integer getId() {
  return id;
 }

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

 public String getName() {
  return name;
 }

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

 public String getTitle() {
  return title;
 }

 public void setTitle(String title) {
  this.title = title;
 }
 
}

 

3.将映射类添加到hibernate.cfg.xml中

<mapping class="com.fengyun.shopping.entity.Teacher"/>

 

4.测试

package com.fengyun.shopping.entity;

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

public class StudentTest {
 public static void main(String[] args) {
  Student s = new Student();
  s.setId(1);
  s.setName("wanghao");
  s.setAge(12);
  
  Configuration cfg = new Configuration();
  SessionFactory sf = cfg.configure().buildSessionFactory();
  Session session = sf.openSession();
  session.beginTransaction();
  session.save(s);
  session.getTransaction().commit();
  session.close();
  sf.close();
 }
}

 
5.修改IDE配置，输入@马上出现提示

window-->perferences-->Java-->Editor-->Content Asist下设置：
 Auto activation delay：100
 Auto activation triggers for Java：.@
 Auto activation triggers for Javadoc:#

 

6.如果是Annotation与XML配置文件混合使用，获得Configuration对象都要使用new AnnotationConfiguration();
异常：
org.hibernate.MappingException: An AnnotationConfiguration instance is required to use <mapping class="com.fengyun.shopping.entity.Teacher"/>