Java Struts2+;Hibernate查询结果为空
我试图从查询中收集结果,但当我在控制台中检查日志时,列表为空。登录操作可以很好地工作,但获取查询结果的操作有些不正常。我还使用size()进行检查,但它也带来了零大小。我错过了什么 参见我的dao类: UserDAO.javaJava Struts2+;Hibernate查询结果为空,java,sql,hibernate,struts2,Java,Sql,Hibernate,Struts2,我试图从查询中收集结果,但当我在控制台中检查日志时,列表为空。登录操作可以很好地工作,但获取查询结果的操作有些不正常。我还使用size()进行检查,但它也带来了零大小。我错过了什么 参见我的dao类: UserDAO.java public User userLogin(String email, String password) { Session session = HibernateUtil.getSessionFactory().openSession(); Trans
public User userLogin(String email, String password) {
Session session = HibernateUtil.getSessionFactory().openSession();
Transaction tx = session.beginTransaction();
User userinfo = new User();
try {
String hql = "select * from user where email =:email and password =:password";
SQLQuery query = session.createSQLQuery(hql);
query.addEntity(User.class);
query.setParameter("email", email);
query.setParameter("password", password);
List rows = query.list();
System.out.println("Total Number Of Records : " + rows.size());
Iterator myItr = rows.iterator();
while (myItr.hasNext()) {
Object ui = (Object) myItr.next();
userinfo = (User) ui;
System.out.println("Username : " + userinfo.getUsername());
}
if (userinfo != null) {
System.out.println("User Retrieved from DB::" + userinfo);
}
tx.commit();
} catch (Exception e) {
if (tx != null) {
tx.rollback();
}
e.printStackTrace();
} finally {
// close your session
session.close();
}
return userinfo;
}
尝试使用
查询
休眠并使用uniqueResult()
:
我猜您的查询实际上没有返回任何内容。userinfo将永远不会为NULL,因为它被实例化为“User userinfo=new User();”。调试电子邮件和密码的值,然后尝试在查询管理器中对数据库运行相同的查询,这将有助于发现问题。
String hql = "from user where email =:email and password =:password";
Query query = session.createQuery(hql);
query.setParameter("email", email);
query.setParameter("password", password);
User userinfo = (User) query.uniqueResult();