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