hibernate HQL查询的例子

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import java.util.List;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.hibernate.query.Query;
import demo.entity.User;
@Test //简单查询所有
public void testGetUser(){
// TODO Auto-generated method stub
SessionFactory sf = null;
Session session = null;
Transaction ts = null;
try {
sf = hibernateUtil.getSessionFactory();
//用getCurrentSession创建的Session实例只属于当前线程
session = sf.getCurrentSession();
ts = session.beginTransaction();
Criteria criteria = session.createCriteria(User.class);
List users = criteria.list();
for(int i=0;i<users.size();i++)
{
User user =(User)users.get(i);
System.out.println(i+”–”+user.getUsername());
}
ts.commit();
} catch (HibernateException e) {
// TODO Auto-generated catch block
if(ts != null)
{
ts.rollback();
}
e.printStackTrace();
}
}
}

import java.util.List;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.hibernate.query.Query;


import demo.entity.User;

@Test //简单查询所有
    public void testGetUser(){
        // TODO Auto-generated method stub
        SessionFactory sf = null;
        Session session = null;
        Transaction ts = null;

        try {
            sf = hibernateUtil.getSessionFactory();
            //用getCurrentSession创建的Session实例只属于当前线程
            session = sf.getCurrentSession();
            ts = session.beginTransaction();
            Criteria criteria = session.createCriteria(User.class);
            List users = criteria.list();
            for(int i=0;i<users.size();i++)
            {
                User user =(User)users.get(i);
                System.out.println(i+"--"+user.getUsername());
            }
            ts.commit();
        } catch (HibernateException e) {
            // TODO Auto-generated catch block
            if(ts != null)
            {
                ts.rollback();
            }
            e.printStackTrace();
        } 
    }
}

结果：

HQL(Hibernate Query Language)是完全面对对象的查询语句，查询功能强大，具备继承、多态和关联等特性。

Query是Hibernate的查询接口，用于从数据存储源查询对象及控制执行查询的过程，Query包装了一个HQL语句。

hibernate5中 org.hibernate.Query 被 org.hibernate.query.Query 替代。

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