Hibernate 之增、删、改、查

数据库：oracle 10g

开发环境：Myeclipse8+

数据库结构：

-- Create table
create table STUDENT
(
  SID       NUMBER not null,
  SNAME     VARCHAR2(10),
  SNO       CHAR(10),
  SAGE      NUMBER,
  SSEX      CHAR(1),
  SBIRTHDAY DATE
)
tablespace USERS
  pctfree 10
  initrans 1
  maxtrans 255
  storage
  (
    initial 64K
    minextents 1
    maxextents unlimited
  );
-- Create/Recreate primary, unique and foreign key constraints 
alter table STUDENT
  add constraint PK_STUDENT primary key (SID)
  using index 
  tablespace USERS
  pctfree 10
  initrans 2
  maxtrans 255
  storage
  (
    initial 64K
    minextents 1
    maxextents unlimited
  );

本例由Myeclipse添加Hibernate框架，及生成pojo类，还有HibernateSessionFactory.java

1）根据主键查找：

public void testFind() {
	Session session = HibernateSessionFactory.getSession();
	Student s = (Student) session.load(Student.class, 1234);//与get的区别：load若主键值不存在，则抛出异常
//	Student s = (Student) session.get(Student.class, 1234);//而get使用时，主键不存在，返回的是null，推荐使用
	System.out.println(s);
	HibernateSessionFactory.closeSession();
}

2）根据主键删除：

public void testDelete(){
	Session session = HibernateSessionFactory.getSession();
	Student s = new Student();
	s.seSid(1234);
	Transaction tran =session.beginTransaction();
	session.delete(s);
	tran.commit();//要记得提交，否则去查看数据库就可以看到数据并没有删除
	HibernateSessionFactory.closeSession();
}

3）根据主键更新：

public void testUpdate1() {
	Session session = HibernateSessionFactory.getSession();
	Object obj = session.get(Tuser.class, 1234);
	if (obj != null) {		

		Student s = (Student) obj;

user.setSname("zhangfei");Transaction tran = session.beginTransaction();session.update(s);tran.commit();}HibernateSessionFactory.closeSession();}

4）增加记录：

public void testSave() {
	Session session = HibernateSessionFactory.getSession();
	Student s = new Student();
	s.setSid(1234);
	s.setSname("zhangfei");
	s.setSno("s001");
	s.setSsex("1");
	s.setSbirthday(new Date());
	Transaction tran = session.beginTransaction(); // save,update,delete都需要加transaction
	session.save(s);
	tran.commit();
	HibernateSessionFactory.closeSession();
}

未完。