Hibernate的问题，配置好了，但是不能真正实现删除操作！
HibernateUtil的代码：
package com.studorm.dao;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
public class HibernateUtil {
private static final SessionFactory sessionFactory;
static {
try {
// Create the SessionFactory
sessionFactory = new Configuration().configure()
.buildSessionFactory();
} catch (Throwable ex) {
ex.printStackTrace();
System.out.println( "Initial SessionFactory creation failed. ");
throw new ExceptionInInitializerError(ex);
}
}
public static final ThreadLocal tLocalsess = new ThreadLocal();
public static final ThreadLocal tLocaltx = new ThreadLocal();
/*
* getting the thread-safe session for using
*/
public static Session currentSession() {
Session session = (Session) tLocalsess.get();
// open a new one, if none can be found.
try {
if (session == null || !session.isOpen()) {
session = openSession();
tLocalsess.set(session);
}
} catch (HibernateException e) {
// throw new HibernateException(e);
e.printStackTrace();
}
return session;
}
/*
* closing the thread-safe session
*/
public static void closeSession() {
Session session = (Session) tLocalsess.get();
try {
if (session!= null && session.isOpen()) {
session.close();
}
tLocalsess.set(null);
} catch (HibernateException e) {
// throw new InfrastructureException(e);
}
}
/*
* begin the transaction
*/
public static void beginTransaction() {
System.out.println( "begin tx ");
Transaction tx = (Transaction) tLocaltx.get();
try {
if (tx == null) {
tx = currentSession().beginTransaction();
tLocaltx.set(tx);
System.out.println( "Tx is End! ");
}
} catch (HibernateException e) {
// throw new InfrastructureException(e);
}
}
/*
* close the transaction
*/
public static void commitTransaction() {
Transaction tx = (Transaction) tLocaltx.get();
try {
if (tx != null && !tx.wasCommitted() && !tx.wasRolledBack())
tx.commit();
System.out.println( "commit tx ");
tLocaltx.set(null);
} catch (HibernateException e) {
// throw new InfrastructureException(e);
}
}
/*
* for rollbacking
*/
public static void rollbackTransaction() {
Transaction tx = (Transaction) tLocaltx.get();
try {
tLocaltx.set(null);
if (tx != null && !tx.wasCommitted() && !tx.wasRolledBack()) {
tx.rollback();
}
} catch (HibernateException e) {
// throw new InfrastructureException(e);
}
}
private static Session openSession() throws HibernateException {
return getSessionFactory().openSession();
}
private static SessionFactory getSessionFactory() throws HibernateException {
return sessionFactory;// SingletonSessionFactory.getInstance();
}
}
实现删除操作的Action代码如下：
/*
* Generated by MyEclipse Struts
* Template path: templates/java/JavaClass.vtl
*/
package com.studorm.struts.action;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.hibernate.Session;
import com.studorm.dao.Students;
import com.studorm.dao.HibernateUtil;
/**
* MyEclipse Struts
* Creation date: 04-17-2007
*
* XDoclet definition:
* @struts.action validate= "true "
* @struts.action-forward name= "deletestudentsuccess " path= "/stumain.jsp "
*/
public class DeletestudentAction extends Action {
/*
* Generated Methods
*/
/**
* Method execute
* @param mapping
* @param form
* @param request
* @param response
* @return ActionForward
*/
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response){
// TODO Auto-generated method stub
int id =new Integer(request.getParameter( "student_id "));
Session s = HibernateUtil.currentSession();
HibernateUtil.beginTransaction();
Students stu = (Students) s.load(Students.class,id);
//System.out.println(stu.getId());
s.delete(stu);
HibernateUtil.commitTransaction();
HibernateUtil.closeSession();
return (mapping.findForward( "deletestudentsuccess "));
}
}
我感觉还是HibernateUtil中的问题，请那位高手给看看！
[解决办法]
public class LoginAction extends Action {
// --------------------- Instance Variables
// --------------------- Methods
/**
* Method execute
* @param mapping
* @param form
* @param request
* @param response
* @return ActionForward
*/
public ActionForward execute(
ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response) {
Session session=HibernateSessionFactory.currentSession();
Transaction tx=session.beginTransaction();
String hql= "delete Admin where id=106 ";
Query query=session.createQuery(hql);
query.executeUpdate();
tx.commit();
HibernateSessionFactory.closeSession();
}
}
beginTransaction() 不需要自己写，用引入就可以
[解决办法]
能不能详细一点呢！谢谢了！
[解决办法]
我正准备学Hibernate关注中
[解决办法]
看看这个, 可以运行
///////////////////////////////////////////////////////////////////
public static int executeUpdate(String sql, Object [] params)
throws HibernateException
{
Session session = currentSession();
Transaction tx = session.beginTransaction();
try {
Query query = session.createQuery(sql);
if (params != null)
{
for(int i=0; i<params.length; i++)
query.setParameter(i, params[i]);
}
int result = query.executeUpdate();
tx.commit();
return result ;
}catch (HibernateException e) {
tx.rollback();
throw e ;
}finally {
HibernateUtil.closeSession();
}
}
[解决办法]
删除完了后 session.flush()没？
