Hibernate

import java.util.Date;

import org.hibernate.Session;
import org.hibernate.Transaction;

import junit.framework.TestCase;

public class SessionTest extends TestCase {

public void testHello2() {
System.out.println("-----------SessionTest.testHello2()------------");

//this.assertEquals("hello", "hello111");
}

public void testSave1() {
Session session = null;
Transaction tx = null;
User user = null;
try {
session = HibernateUtils.getSession();
tx = session.beginTransaction();

//Transient状态
user = new User();
user.setName("李四");
user.setPassword("123");
user.setCreateTime(new Date());
user.setExpireTime(new Date());

//persistent状态,当属性发生改变的时候，hibernate会自动和数据库同步
session.save(user);

user.setName("王五");
//session.update(user);
tx.commit();
}catch(Exception e) {
e.printStackTrace();
tx.rollback();
}finally {
HibernateUtils.closeSession(session);
}

//detached状态
user.setName("张三");
try {
session = HibernateUtils.getSession();
session.beginTransaction();
//persistent状态
session.update(user);
session.getTransaction().commit();
}catch(Exception e) {
e.printStackTrace();
session.getTransaction().rollback();
}finally {
HibernateUtils.closeSession(session);
}
}

public void testReadByGetMethod1() {
Session session = null;
try {
session = HibernateUtils.getSession();
session.beginTransaction();

//马上发出查询sql，加载User对象
User user = (User)session.get(User.class, "402880d01b9bf210011b9bf2a2ff0001");
System.out.println("user.name=" + user.getName());

//persistent状态,当属性发生改变的时候，hibernate会自动和数据库同步
user.setName("龙哥");
session.getTransaction().commit();
}catch(Exception e) {
e.printStackTrace();
session.getTransaction().rollback();
}finally {
HibernateUtils.closeSession(session);
}
}

public void testReadByGetMethod2() {
Session session = null;
try {
session = HibernateUtils.getSession();
session.beginTransaction();

//采用get加载数据，如果数据库中不存在相应的数据，返回null
User user = (User)session.get(User.class, "asdfsafsdfdsf");

session.getTransaction().commit();
}catch(Exception e) {
e.printStackTrace();
session.getTransaction().rollback();
}finally {
HibernateUtils.closeSession(session);
}
}

public void testReadByLoadMethod1() {
Session session = null;
try {
session = HibernateUtils.getSession();
session.beginTransaction();

//不会发出查询sql，因为load方法实现了lazy（懒加载或延迟加载）
//延迟加载：只有真正使用这个对象的时候，才加载（发出sql语句）
//hibernate延迟加载实现原理是代理方式
User user = (User)session.load(User.class, "402880d01b9bf210011b9bf2a2ff0001");
System.out.println("user.name=" + user.getName());

//persistent状态,当属性发生改变的时候，hibernate会自动和数据库同步
user.setName("发哥");
session.getTransaction().commit();
}catch(Exception e) {
e.printStackTrace();
session.getTransaction().rollback();
}finally {
HibernateUtils.closeSession(session);
}
}

public void testReadByLoadMethod2() {
Session session = null;
try {
session = HibernateUtils.getSession();
session.beginTransaction();

//采用load加载数据，如果数据库中没有相应的数据
//那么抛出ObjectNotFoundException
User user = (User)session.load(User.class, "55555555");

System.out.println(user.getName());

session.getTransaction().commit();
}catch(Exception e) {
e.printStackTrace();
session.getTransaction().rollback();
throw new java.lang.RuntimeException();
}finally {
HibernateUtils.closeSession(session);
}
}

public void testUpdate1() {
Session session = null;
try {
session = HibernateUtils.getSession();
session.beginTransaction();

//手动构造的detached状态的对象
User user = new User();
user.setId("402880d01b9be8dc011b9be9b23d0001");
user.setName("德华");

session.update(user);
session.getTransaction().commit();
}catch(Exception e) {
e.printStackTrace();
session.getTransaction().rollback();
}finally {
HibernateUtils.closeSession(session);
}
}


public void testDelete1() {
Session session = null;
try {
session = HibernateUtils.getSession();
session.beginTransaction();

// //手动构造的detached状态的对象
// User user = new User();
// user.setId("402880d01b9be8dc011b9be9b23d0001");
// user.setName("德华");
// session.delete(user);

User user = (User)session.load(User.class, "402880d01b9be8dc011b9be9b23d0001");
session.delete(user);
session.getTransaction().commit();
}catch(Exception e) {
e.printStackTrace();
session.getTransaction().rollback();
}finally {
HibernateUtils.closeSession(session);
}

//transient状态
}

}

import java.util.Iterator;
import java.util.List;

import org.hibernate.Query;
import org.hibernate.Session;

import junit.framework.TestCase;

public class QueryTest extends TestCase {

public void testQuery() {
Session session = null;
try {
session = HibernateUtils.getSession();
session.beginTransaction();
Query query = session.createQuery("from User");
query.setFirstResult(2);
query.setMaxResults(2);
List userList = query.list();
for (Iterator iter=userList.iterator(); iter.hasNext();) {
User user = (User)iter.next();
System.out.println(user.getId());
System.out.println(user.getName());
}
session.getTransaction().commit();
}catch(Exception e) {
e.printStackTrace();
session.getTransaction().rollback();
}finally {
HibernateUtils.closeSession(session);
}
}
}