Hibernate HQL 语句

/**
 *
 */
package com.b510.example;

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

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

/**
 *
 * @author XHW
 *
 * @date 2011-6-18
 *
 */
public class HibernateTest {

 /**
  * @param args
  */
 public static void main(String[] args) {
  HibernateTest test=new HibernateTest();
  test.list();
  test.oneResult();
  test.iterate();
  test.iterateHuancun();
  test.jiChenChaXun();
  test.touYinChaXun();
  test.touYinChaXunMap();
  test.touYinChaXunObject();
  test.checkDistinct();
  test.where(); }
 
 public void list(){
  Session session=HibernateSessionFactoryUtil.getSessionFactory().openSession();
  session.beginTransaction();
  Query query=session.createQuery("from User");
  query.setMaxResults(2);//返回2条记录
  query.setFirstResult(2);//从第2条记录开始
  
  List<User> list=query.list();
  session.getTransaction().commit();
  
  for(User user:list){
   System.out.println(user.getId()+", "+user.getUsername()+",  "+user.getPassword());
  }
 }

 public void oneResult(){
  Session session=HibernateSessionFactoryUtil.getSessionFactory().openSession();
  session.beginTransaction();
  Query query=session.createQuery("from User");
  query.setMaxResults(1);//返回1条记录
  query.setFirstResult(2);//从第2条记录开始
  
  User user=(User)query.uniqueResult();
    
  System.out.println(user.getId()+", "+user.getUsername());
  
  session.getTransaction().commit();
 }
 public void iterate(){//此方法的SQL语句格式为  n+1
  Session session=HibernateSessionFactoryUtil.getSessionFactory().openSession();
  session.beginTransaction();
  Query query=session.createQuery("from User");
  
  Iterator it=query.iterate();
  while(it.hasNext()){
   User user=(User)it.next();
   System.out.println(user.getId()+", "+user.getUsername()+",  "+user.getPassword());
  }
  
  session.getTransaction().commit();
 }
 
 public void iterateHuancun(){
  // 充分利用Hibernate中的缓存数据 如果Hibernate缓存中不存在数据，则使用list方法执行效率更高
  //List<User> list=query.list();
  Session session=HibernateSessionFactoryUtil.getSessionFactory().openSession();
  session.beginTransaction();
  Query query=session.createQuery("from User");
  
  Iterator it=query.iterate();
  while(it.hasNext()){
   User user=(User)it.next();
   System.out.println(user.getId()+", "+user.getUsername()+",  "+user.getPassword());
  }
  System.out.println("-----------------------------------------------");
  it=query.iterate();
  while(it.hasNext()){
   User user=(User)it.next();
   System.out.println(user.getId()+", "+user.getUsername()+",  "+user.getPassword());
  }  
  session.getTransaction().commit();
 }

 public void jiChenChaXun(){
  /**
   *  HQL中持久化类的继承查询
   hibernate.cfg.xml 中的配置文件
   <mapping resource="com/b510/example/User.hbm.xml" />
   <mapping resource="com/b510/example/Profile.hbm.xml" />
   */
  Session session=HibernateSessionFactoryUtil.getSessionFactory().openSession();
  session.beginTransaction();
  Query query=session.createQuery("from java.lang.Object");
  List<Object> list=query.list();
  
  for(Object o:list){
   System.out.println(o.getClass().getName());
  }  
  session.getTransaction().commit();
 }
 
 public void touYinChaXun(){//投影查询  返回的是一个Object数组
  Session session=HibernateSessionFactoryUtil.getSessionFactory().openSession();
  session.beginTransaction();
  Query query=session.createQuery("select id,username,password from User");  
  List<Object[]> list=query.list();
  
   session.getTransaction().commit();

   for(Object[] o:list){
    System.out.println(o[0]+",  "+o[1]+",  "+o[2]);
   }
 }
 
 public void touYinChaXunObject(){
  //投影查询 返回的是一个对象
  /**
   * 在User.java持久化类中添加构造方法才能执行，否则就会报错
   * public User(Integer id,String username,String password){
   * this.id=id;
   * this.username=username;
   * this.password=password;
   * }
   */
  Session session=HibernateSessionFactoryUtil.getSessionFactory().openSession();
  session.beginTransaction();
  Query query=session.createQuery("select new User(id,username,password) from User");  
  List<User> list=query.list();
  
   session.getTransaction().commit();

   for(User user:list){
    System.out.println(user.getId()+",  "+user.getUsername()+",  "+user.getPassword());
   }
 }

 public void touYinChaXunMap(){
  //使用Map查询
  Session session=HibernateSessionFactoryUtil.getSessionFactory().openSession();
  session.beginTransaction();
  Query query=session.createQuery("select new Map(u.id as id,u.username as name) from User as u");
  //可以把as省略
  //Query query=session.createQuery("select new Map(u.id as id,u.username as name) from User u");  
  List<Map> list=query.list();

  for(Map map:list){
    System.out.println(map.get("id")+",   "+map.get("name"));
   }
   session.getTransaction().commit();
 
 }
 public void checkDistinct(){
  //使用distinct查询
  Session session=HibernateSessionFactoryUtil.getSessionFactory().openSession();
  session.beginTransaction();
  Query query=session.createQuery("select distinct username from User");
  List<String> list=query.list();

  for(String name:list){
    System.out.println(name);
   }
   session.getTransaction().commit();
 
 }
 
 public void where(){
  //使用where查询
  Session session=HibernateSessionFactoryUtil.getSessionFactory().openSession();
  session.beginTransaction();
  Query query=session.createQuery("from User where id not between 200 and 2000");
  List<User> list=query.list();

  for(User user:list){
    System.out.println(user.getId()+user.getUsername());
   }
  //投影查询 中使用where子句
  query=session.createQuery("select username from User where id=2");
  List<String> listname=query.list();

  for(String name:listname){
    System.out.println(name);
   }
  //in查询
  query=session.createQuery("from User where username in ('Hongten','Hanyuan','dfgd')");
  List<User> listin=query.list();

  for(User user:listin){
    System.out.println(user.getId()+user.getUsername());
   }
  //like查询
  query=session.createQuery("from User where username not like 'Hon%'");
  List<User> listlike=query.list();

  for(User user:listlike){
    System.out.println(user.getId()+user.getUsername());
   }
  //null查询
  query=session.createQuery("from User where password is null");
  List<User> listnull=query.list();

  for(User user:listnull){
    System.out.println(user.getId()+user.getUsername());
   }
  //and查询
  query=session.createQuery("from User where password is not null and id<5");
  List<User> listand=query.list();
 
  for(User user:listand){
    System.out.println(user.getId()+user.getUsername()+user.getPassword());
   }
  //order by
  query=session.createQuery("from User order by username,id desc");
  List<User> listorderby=query.list();

  for(User user:listorderby){
    System.out.println(user.getId()+user.getUsername());
   }
  //使用"?"号 作为参数占位符，一条HQL语句中可以使用多个？
  //query.setInteger(0,2)
  //query.setString(0,"Hongten")
  query=session.createQuery("select username from User where username=?");
  query.setString(0,"Hongten");
  List<String> listwenhao=query.list();
  for(String name:listwenhao){
    System.out.println(name);
   }
  
   session.getTransaction().commit();
 }
}

结果：

Hibernate:
    select
        user0_.id as id0_,
        user0_.username as username0_,
        user0_.password as password0_
    from
        users.user user0_ limit ?,
        ?
3, Hanyuan,  5645645
4, dfgd,  5645645
Hibernate:
    select
        user0_.id as id0_,
        user0_.username as username0_,
        user0_.password as password0_
    from
        users.user user0_ limit ?,
        ?
3, Hanyuan
Hibernate:
    select
        user0_.id as col_0_0_
    from
        users.user user0_
Hibernate:
    select
        user0_.id as id0_0_,
        user0_.username as username0_0_,
        user0_.password as password0_0_
    from
        users.user user0_
    where
        user0_.id=?
1, Hongten,  123
Hibernate:
    select
        user0_.id as id0_0_,
        user0_.username as username0_0_,
        user0_.password as password0_0_
    from
        users.user user0_
    where
        user0_.id=?
2, Hanyuan,  5645645
Hibernate:
    select
        user0_.id as id0_0_,
        user0_.username as username0_0_,
        user0_.password as password0_0_
    from
        users.user user0_
    where
        user0_.id=?
3, Hanyuan,  5645645
Hibernate:
    select
        user0_.id as id0_0_,
        user0_.username as username0_0_,
        user0_.password as password0_0_
    from
        users.user user0_
    where
        user0_.id=?
4, dfgd,  5645645
Hibernate:
    select
        user0_.id as id0_0_,
        user0_.username as username0_0_,
        user0_.password as password0_0_
    from
        users.user user0_
    where
        user0_.id=?
5, dfgd,  5645645
Hibernate:
    select
        user0_.id as col_0_0_
    from
        users.user user0_
Hibernate:
    select
        user0_.id as id0_0_,
        user0_.username as username0_0_,
        user0_.password as password0_0_
    from
        users.user user0_
    where
        user0_.id=?
1, Hongten,  123
Hibernate:
    select
        user0_.id as id0_0_,
        user0_.username as username0_0_,
        user0_.password as password0_0_
    from
        users.user user0_
    where
        user0_.id=?
2, Hanyuan,  5645645
Hibernate:
    select
        user0_.id as id0_0_,
        user0_.username as username0_0_,
        user0_.password as password0_0_
    from
        users.user user0_
    where
        user0_.id=?
3, Hanyuan,  5645645
Hibernate:
    select
        user0_.id as id0_0_,
        user0_.username as username0_0_,
        user0_.password as password0_0_
    from
        users.user user0_
    where
        user0_.id=?
4, dfgd,  5645645
Hibernate:
    select
        user0_.id as id0_0_,
        user0_.username as username0_0_,
        user0_.password as password0_0_
    from
        users.user user0_
    where
        user0_.id=?
5, dfgd,  5645645
-----------------------------------------------
Hibernate:
    select
        user0_.id as col_0_0_
    from
        users.user user0_
1, Hongten,  123
2, Hanyuan,  5645645
3, Hanyuan,  5645645
4, dfgd,  5645645
5, dfgd,  5645645
Hibernate:
    select
        user0_.id as id0_,
        user0_.username as username0_,
        user0_.password as password0_
    from
        users.user user0_
Hibernate:
    select
        profile0_.id as id1_,
        profile0_.user_id as user2_1_,
        profile0_.email as email1_,
        profile0_.phone as phone1_,
        profile0_.mobile as mobile1_,
        profile0_.address as address1_,
        profile0_.postcode as postcode1_
    from
        users.profile profile0_
com.b510.example.User
com.b510.example.User
com.b510.example.User
com.b510.example.User
com.b510.example.User
com.b510.example.Profile
com.b510.example.Profile
com.b510.example.Profile
com.b510.example.Profile
com.b510.example.Profile
Hibernate:
    select
        user0_.id as col_0_0_,
        user0_.username as col_1_0_,
        user0_.password as col_2_0_
    from
        users.user user0_
1,  Hongten,  123
2,  Hanyuan,  5645645
3,  Hanyuan,  5645645
4,  dfgd,  5645645
5,  dfgd,  5645645
Hibernate:
    select
        user0_.id as col_0_0_,
        user0_.username as col_1_0_
    from
        users.user user0_
1,   Hongten
2,   Hanyuan
3,   Hanyuan
4,   dfgd
5,   dfgd
Hibernate:
    select
        user0_.id as col_0_0_,
        user0_.username as col_1_0_,
        user0_.password as col_2_0_
    from
        users.user user0_
1,  Hongten,  123
2,  Hanyuan,  5645645
3,  Hanyuan,  5645645
4,  dfgd,  5645645
5,  dfgd,  5645645
Hibernate:
    select
        distinct user0_.username as col_0_0_
    from
        users.user user0_
Hongten
Hanyuan
dfgd
Hibernate:
    select
        user0_.id as id0_,
        user0_.username as username0_,
        user0_.password as password0_
    from
        users.user user0_
    where
        user0_.id not between 200 and 2000
1Hongten
2Hanyuan
3Hanyuan
4dfgd
5dfgd
Hibernate:
    select
        user0_.username as col_0_0_
    from
        users.user user0_
    where
        user0_.id=2
Hanyuan
Hibernate:
    select
        user0_.id as id0_,
        user0_.username as username0_,
        user0_.password as password0_
    from
        users.user user0_
    where
        user0_.username in (
            'Hongten' , 'Hanyuan' , 'dfgd'
        )
1Hongten
2Hanyuan
3Hanyuan
4dfgd
5dfgd
Hibernate:
    select
        user0_.id as id0_,
        user0_.username as username0_,
        user0_.password as password0_
    from
        users.user user0_
    where
        user0_.username not like 'Hon%'
2Hanyuan
3Hanyuan
4dfgd
5dfgd
Hibernate:
    select
        user0_.id as id0_,
        user0_.username as username0_,
        user0_.password as password0_
    from
        users.user user0_
    where
        user0_.password is null
Hibernate:
    select
        user0_.id as id0_,
        user0_.username as username0_,
        user0_.password as password0_
    from
        users.user user0_
    where
        (
            user0_.password is not null
        )
        and user0_.id<5
1Hongten123
2Hanyuan5645645
3Hanyuan5645645
4dfgd5645645
Hibernate:
    select
        user0_.id as id0_,
        user0_.username as username0_,
        user0_.password as password0_
    from
        users.user user0_
    order by
        user0_.username,
        user0_.id desc
5dfgd
4dfgd
3Hanyuan
2Hanyuan
1Hongten
Hibernate:
    select
        user0_.username as col_0_0_
    from
        users.user user0_
    where
        user0_.username=?
Hongten