Hibernate HQL查询（1）

1. 查询整个映射对象所有字段

//直接from查询出来的是一个映射对象，即：查询整个映射对象所有字段  
        String hql ="from Users";  
        Query query = session.createQuery(hql);  
            
        List<Users> users = query.list();  
        for(Users user : users){  
            System.out.println(user.getName() +" : "+ user.getPasswd() +" : "+ user.getId());  
        }  
   
 输出结果为：  
name1 : password1 :1 
name2 : password2 :2 
name3 : password3 :3 

2.查询字段　　

//查询其中几个字段  
        String hql =" select name,passwd from Users";  
        Query query = session.createQuery(hql);  
        //默认查询出来的list里存放的是一个Object数组  
        List<Object[]> list = query.list();  
        for(Object[] object : list){  
            String name = (String)object[0];  
            String passwd = (String)object[1];  
                
            System.out.println(name +" : "+ passwd);  
        }  
输出结果为：  
name1 : password1  
name2 : password2  
name3 : password3 

3.修改默认查询结果(query.list())不以Object[]数组形式返回，以List形式返回

//查询其中几个字段,添加new list(),注意list里的l是小写的。也不需要导入包，这样通过query.list()出来的list里存放的不再是默认的Object数组了，而是List集合了 
         String hql =" select new list(name,passwd) from Users";  
        Query query = session.createQuery(hql);  
        //默认查询出来的list里存放的是一个Object数组，但是在这里list里存放的不再是默认的Object数组了，而是List集合了  
        List<List> list = query.list();  
        for(List user : list){  
            String name = (String)user.get(0);  
            String passwd = (String)user.get(1);  
                
            System.out.println(name +" : "+ passwd);  
        }  
        /** 
        输出结果为： 
         name1 : password1 
        name2 : password2 
        name3 : password3 
         */ 

4.修改默认查询结果(query.list())不以Object[]数组形式返回，以Map形式返回

//查询其中几个字段,添加new map(),注意map里的m是小写的。也不需要导入包，这样通过query.list()出来的list里存放的不再是默认的Object数组了，而是map集合了  
        String hql =" select new map(name,passwd) from Users";  
        Query query = session.createQuery(hql);  
        //默认查询出来的list里存放的是一个Object数组，但是在这里list里存放的不再是默认的Object数组了，而是Map集合了  
        List<Map> list = query.list();  
        for(Map user : list){  
            //一条记录里所有的字段值都是map里的一个元素,key是字符串0,1,2,3....，value是字段值  
            //如果将hql改为：String hql = " select new map(name as username,passwd as password) from Users";,那么key将不是字符串0,1,2...了，而是"username","password"了  
            String name = (String)user.get("0");//get("0");是get(key),注意:0,1,2...是字符串，而不是整形  
            String passwd = (String)user.get("1");  
                
            System.out.println(name +" : "+ passwd);  
        }  
        /** 
        输出结果为： 
         name1 : password1 
        name2 : password2 
        name3 : password3 
         */ 

5.修改默认查询结果(query.list())不以Object[]数组形式返回，以自定义类型返回

6.条件查询

//条件查询，参数索引值从0开始，索引位置。通过setString,setParameter设置参数  
        String hql ="from Users where name=? and passwd=?";  
        Query query = session.createQuery(hql);  
        //第1种方式  
//      query.setString(0, "name1");  
//      query.setString(1, "password1");  
        //第2种方式  
        query.setParameter(0,"name1",Hibernate.STRING);  
        query.setParameter(1,"password1",Hibernate.STRING);  
        List<Users> list = query.list();  
        for(Users users : list){  
            System.out.println(users.getId());  
        }  
//条件查询，自定义索引名(参数名):username,:password.通过setString,setParameter设置参数  
        String hql ="from Users where name=:username and passwd=:password";  
        Query query = session.createQuery(hql);  
        //第1种方式  
//      query.setString("username", "name1");  
//      query.setString("password", "password1");  
        //第2种方式,第3个参数确定类型  
        query.setParameter("username","name1",Hibernate.STRING);  
        query.setParameter("password","password1",Hibernate.STRING);  
        List<Users> list = query.list();  
        for(Users users : list){  
            System.out.println(users.getId());  
        } 

　　

//条件查询,通过setProperties设置参数  
        String hql ="from Users where name=:username and passwd=:password";  
        Query query = session.createQuery(hql);  
        //MyUser类的2个属性必须和:username和:password对应  
        MyUser myUser =newMyUser("name1","password1");  
        query.setProperties(myUser);  
        List<Users> list = query.list();  
        for(Users users : list){  
            System.out.println(users.getId());  
        } 

　　

7.update 数据

           执行SQL语句（为什么要用SQL语句，我想是为了执行某些复杂的SQL语句吧）　

String sql="update Table set field = 'test'"
Session session = HibernateSessionFactory.getSession();
session.createSQLQuery(sql).executeUpdate();
ts.commit();

     

   执行HQL语句　　　

String hql="update Table set field = 'test'"
Session session = HiberanteSessionFactory.getSession();
Transaction ts = session.beginTransaction();
Query query = session.createQuery(hql);
query.executeUpdate();

ts.commit();

*************************************************************************************

/**
 *
 */
package com.b510.example;

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

import org.hibernate.Criteria;
import org.hibernate.FetchMode;
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.where();
  test.function();
  test.update();
  test.jiaoChaCheck();
  test.innerJoin();
  test.QBC();
  test.leftOuterJoin();
  test.rightOuterJoin();
 }


 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();

 }

 public void function() {// 把大写字母转化为小写字母
  // 作用可以用在：比如在一个用户注册的程序中，大小写不容易区分，但是全部转化为小写后就可以很容易进行比较
  Session session = HibernateSessionFactoryUtil.getSessionFactory()
    .openSession();
  session.beginTransaction();
  // 输出原始的数据
  Query query = session.createQuery("select username from User");
  List<String> list = query.list();

  for (String name : list) {
   System.out.println(name);
  }
  System.out.println("-------------------------------------------");
  // 输出的数据全部转化为小写
  query = session.createQuery("select lower(username) from User");
  List<String> listChange = query.list();

  for (String name : listChange) {
   System.out.println(name);
  }
  session.getTransaction().commit();
 }

 public void update() {
  Session session = HibernateSessionFactoryUtil.getSessionFactory()
    .openSession();
  session.beginTransaction();
  Query query = session
    .createQuery("update User set username='洪伟1231' where id=?");
  query.setInteger(0, 3);
  int rowCount = query.executeUpdate();
  System.out.println(rowCount);
  session.getTransaction().commit();
 }

 public void operateProfile() {// 对profile这个类执行HQL语句操作
  Session session = HibernateSessionFactoryUtil.getSessionFactory()
    .openSession();
  session.beginTransaction();
  // 执行查询操作
  Query query = session.createQuery("from Profile");
  List<Profile> list = query.list();
  for (Profile profile : list) {
   System.out.println(profile.getId() + profile.getEmail()
     + profile.getAddress() + profile.getMobile()
     + profile.getPostcode());
  }
  // 执行删除操作
  query = session.createQuery("delete from Profile where id=?");
  query.setInteger(0, 3);
  int rowCount = query.executeUpdate();
  System.out.println(rowCount);
  session.getTransaction().commit();
 }

 public void jiaoChaCheck() {//交叉查询
  //这种方法查询出来的结果是笛卡尔积，对于我们开发中没有多大用处
  Session session = HibernateSessionFactoryUtil.getSessionFactory()
    .openSession();
  session.beginTransaction();
  Query query=session.createQuery("from User,Profile");
  
  List<Object[]> list=query.list();
  
  for(Object[] values:list){
   User user=(User)values[0];
   System.out.print("ID :"+user.getId()+",UserName:"+user.getUsername()+",Password:"+user.getPassword());
   Profile profile=(Profile)values[1];
   System.out.println(profile.getEmail()+profile.getMobile()+profile.getAddress()+profile.getPostcode());
  }
  
  session.getTransaction().commit();
 }

 public void innerJoin(){//内连接查询
  /**
   * 下面三种hql语句都是可以得到相同的结果
   * String hql="select p from Profile as p inner join p.user";
   * 在下面的hql语句中加入"fetch"后，此hql语句变为了"迫切HQL"语句，这样的查询效率要比上面的hql语句要高
   * String hql="select p from Profile as p inner join fetch p.user";
   *
   * String hql="select p from Profile p,User u where p.user=u";
   * String hql="select p from Profile p,User u where p.user.id=u.id";
   * 
   */  
  Session session = HibernateSessionFactoryUtil.getSessionFactory()
    .openSession();
  session.beginTransaction();
  String hql="select p from Profile as p inner join fetch p.user";
  //String hql="select p from Profile p,User u where p.user=u";
  //String hql="select p from Profile p,User u where p.user.id=u.id";
  Query query=session.createQuery(hql);
  List<Profile> list=query.list();
  for(Profile p:list){
   System.out.println("ID:"+p.getUser().getId()+"   Username: "+p.getUser().getUsername()+"   Email: "+p.getEmail()+",   Address: "+p.getAddress());
  }
  session.getTransaction().commit();
  }

 public void QBC(){//QBC中实现内连接查询
  Session session=HibernateSessionFactoryUtil.getSessionFactory().openSession();
  session.beginTransaction();
  Criteria criteria=session.createCriteria(Profile.class).createCriteria("user");
  List<Profile> list=criteria.list();
  
  for(Profile p:list){
   System.out.println("ID:"+p.getUser().getId()+"   Username: "+p.getUser().getUsername()+"   Email: "+p.getEmail()+",   Address: "+p.getAddress());
  }
  //QBC中实现外连接
  System.out.println("##################################################");
  criteria=session.createCriteria(Profile.class).setFetchMode("user", FetchMode.JOIN);
  List<Profile> listp=criteria.list();
  
  for(Profile p:list){
   System.out.println("ID:"+p.getUser().getId()+"   Username: "+p.getUser().getUsername()+"   Email: "+p.getEmail()+",   Address: "+p.getAddress());    
  }  
  session.getTransaction().commit();
 }

 public void leftOuterJoin(){//左外连接
  /**
   * String hql="select p from Profile p left outer join p.user order by p.user.id";
   * 在下面的hql语句中加入"fetch"后，此hql语句变为了"迫切HQL"语句，这样的查询效率要比上面的hql语句要高
   * String hql="select p from Profile p left outer join fetch p.user order by p.user.id";
   *
   * String hqlu="select u from User u left outer join u.profiles";
   *  在下面的hql语句中加入"fetch"后，此hql语句变为了"迫切HQL"语句，这样的查询效率要比上面的hql语句要高
   * String hqlu="select u from User u left outer join fetch u.profiles";
   */
  Session session=HibernateSessionFactoryUtil.getSessionFactory().getCurrentSession();
  session.beginTransaction();
  String hql="select p from Profile p left outer join fetch p.user order by p.user.id";
  Query query=session.createQuery(hql);
  
  List<Profile> list=query.list();
  for(Profile p:list){
   System.out.println("ID:"+p.getUser().getId()+"   Username: "+p.getUser().getUsername()+"   Email: "+p.getEmail()+",   Address: "+p.getAddress());
  }
  
  System.out.println("-------------------------------------");
  String hqlu="select u from User u left outer join fetch u.profiles";
  query=session.createQuery(hqlu);
  
  List<User> listu=query.list();
  for(User u:listu){
   System.out.println(u.getId()+u.getUsername()+u.getProfiles());
  }
  session.getTransaction().commit();
   
 }
 
 public void rightOuterJoin(){//右外连接
  Session session=HibernateSessionFactoryUtil.getSessionFactory().getCurrentSession();
  session.beginTransaction();
  String hql="select u from User u right outer join u.profiles order by u.id";
  Query query=session.createQuery(hql);
  
  List<User> listu=query.list();
  for(User user:listu){
   System.out.println(user.getId()+user.getUsername()+user.getProfiles());
  }
  
  session.getTransaction().commit();
   
 }
 
}

结果：

log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
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
3hongwei
4mingliu
5shouzhang
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
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
4mingliu
5shouzhang
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
3hongwei5645645
4mingliu5645645
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
2hanyuan
1hongten
3hongwei
4mingliu
5shouzhang
Hibernate:
    select
        user0_.username as col_0_0_
    from
        users.user user0_
    where
        user0_.username=?
hongten
Hibernate:
    select
        user0_.username as col_0_0_
    from
        users.user user0_
hongten
hanyuan
hongwei
mingliu
shouzhang
-------------------------------------------
Hibernate:
    select
        lower(user0_.username) as col_0_0_
    from
        users.user user0_
hongten
hanyuan
hongwei
mingliu
shouzhang
Hibernate:
    update
        users.user
    set
        username='Hongwei1231'
    where
        id=?
1
Hibernate:
    select
        user0_.id as id0_0_,
        profile1_.id as id1_1_,
        user0_.username as username0_0_,
        user0_.password as password0_0_,
        profile1_.user_id as user2_1_1_,
        profile1_.email as email1_1_,
        profile1_.phone as phone1_1_,
        profile1_.mobile as mobile1_1_,
        profile1_.address as address1_1_,
        profile1_.postcode as postcode1_1_
    from
        users.user user0_,
        users.profile profile1_
ID :1,UserName:hongten,Password:123hongtenzone@foxmail.com45464Guangzhoushi65465
ID :1,UserName:hongten,Password:123hanyuan@foxmail.com45648255GuangzhoushiDianbian65465
ID :1,UserName:hongten,Password:123hanyuan@foxmail.com45648255GuangzhoushiDianbian65465
ID :2,UserName:hanyuan,Password:5645645hongtenzone@foxmail.com45464Guangzhoushi65465
ID :2,UserName:hanyuan,Password:5645645hanyuan@foxmail.com45648255GuangzhoushiDianbian65465
ID :2,UserName:hanyuan,Password:5645645hanyuan@foxmail.com45648255GuangzhoushiDianbian65465
ID :3,UserName:Hongwei1231,Password:5645645hongtenzone@foxmail.com45464Guangzhoushi65465
ID :3,UserName:Hongwei1231,Password:5645645hanyuan@foxmail.com45648255GuangzhoushiDianbian65465
ID :3,UserName:Hongwei1231,Password:5645645hanyuan@foxmail.com45648255GuangzhoushiDianbian65465
ID :4,UserName:mingliu,Password:5645645hongtenzone@foxmail.com45464Guangzhoushi65465
ID :4,UserName:mingliu,Password:5645645hanyuan@foxmail.com45648255GuangzhoushiDianbian65465
ID :4,UserName:mingliu,Password:5645645hanyuan@foxmail.com45648255GuangzhoushiDianbian65465
ID :5,UserName:shouzhang,Password:5645645hongtenzone@foxmail.com45464Guangzhoushi65465
ID :5,UserName:shouzhang,Password:5645645hanyuan@foxmail.com45648255GuangzhoushiDianbian65465
ID :5,UserName:shouzhang,Password:5645645hanyuan@foxmail.com45648255GuangzhoushiDianbian65465
Hibernate:
    select
        profile0_.id as id1_0_,
        user1_.id as id0_1_,
        profile0_.user_id as user2_1_0_,
        profile0_.email as email1_0_,
        profile0_.phone as phone1_0_,
        profile0_.mobile as mobile1_0_,
        profile0_.address as address1_0_,
        profile0_.postcode as postcode1_0_,
        user1_.username as username0_1_,
        user1_.password as password0_1_
    from
        users.profile profile0_
    inner join
        users.user user1_
            on profile0_.user_id=user1_.id
ID:1   Username: hongten   Email: hongtenzone@foxmail.com,   Address: Guangzhoushi
ID:2   Username: hanyuan   Email: hanyuan@foxmail.com,   Address: GuangzhoushiDianbian
ID:3   Username:Hongwei1231   Email: hanyuan@foxmail.com,   Address: GuangzhoushiDianbian
Hibernate:
    select
        this_.id as id1_1_,
        this_.user_id as user2_1_1_,
        this_.email as email1_1_,
        this_.phone as phone1_1_,
        this_.mobile as mobile1_1_,
        this_.address as address1_1_,
        this_.postcode as postcode1_1_,
        user1_.id as id0_0_,
        user1_.username as username0_0_,
        user1_.password as password0_0_
    from
        users.profile this_
    inner join
        users.user user1_
            on this_.user_id=user1_.id
ID:1   Username: hongten   Email: hongtenzone@foxmail.com,   Address: Guangzhoushi
ID:2   Username: hanyuan   Email: hanyuan@foxmail.com,   Address: GuangzhoushiDianbian
ID:3   Username: Hongwei1231   Email: hanyuan@foxmail.com,   Address: GuangzhoushiDianbian
##################################################
Hibernate:
    select
        this_.id as id1_1_,
        this_.user_id as user2_1_1_,
        this_.email as email1_1_,
        this_.phone as phone1_1_,
        this_.mobile as mobile1_1_,
        this_.address as address1_1_,
        this_.postcode as postcode1_1_,
        user2_.id as id0_0_,
        user2_.username as username0_0_,
        user2_.password as password0_0_
    from
        users.profile this_
    left outer join
        users.user user2_
            on this_.user_id=user2_.id
ID:1   Username: hongten   Email: hongtenzone@foxmail.com,   Address: Guangzhoushi
ID:2   Username: hanyuan   Email: hanyuan@foxmail.com,   Address: GuangzhoushiDianbian
ID:3   Username: 洪伟1231   Email: hanyuan@foxmail.com,   Address: GuangzhoushiDianbian
Hibernate:
    select
        profile0_.id as id1_0_,
        user1_.id as id0_1_,
        profile0_.user_id as user2_1_0_,
        profile0_.email as email1_0_,
        profile0_.phone as phone1_0_,
        profile0_.mobile as mobile1_0_,
        profile0_.address as address1_0_,
        profile0_.postcode as postcode1_0_,
        user1_.username as username0_1_,
        user1_.password as password0_1_
    from
        users.profile profile0_
    left outer join
        users.user user1_
            on profile0_.user_id=user1_.id
    order by
        profile0_.user_id
ID:1   Username: hongten   Email: hongtenzone@foxmail.com,   Address: Guangzhoushi
ID:2   Username: hanyuan   Email: hanyuan@foxmail.com,   Address: GuangzhoushiDianbian
ID:3   Username: 洪伟1231   Email: hanyuan@foxmail.com,   Address: GuangzhoushiDianbian
-------------------------------------
Hibernate:
    select
        user0_.id as id0_0_,
        profiles1_.id as id1_1_,
        user0_.username as username0_0_,
        user0_.password as password0_0_,
        profiles1_.user_id as user2_1_1_,
        profiles1_.email as email1_1_,
        profiles1_.phone as phone1_1_,
        profiles1_.mobile as mobile1_1_,
        profiles1_.address as address1_1_,
        profiles1_.postcode as postcode1_1_,
        profiles1_.user_id as user2_0__,
        profiles1_.id as id0__
    from
        users.user user0_
    left outer join
        users.profile profiles1_
            on user0_.id=profiles1_.user_id
1hongten[com.b510.example.Profile@14eaec9]
2hanyuan[com.b510.example.Profile@569c60]
3Hongwei1231[com.b510.example.Profile@d67067]
4mingliu[]
5shouzhang[]
Hibernate:
    select
        user0_.id as id0_,
        user0_.username as username0_,
        user0_.password as password0_
    from
        users.user user0_
    right outer join
        users.profile profiles1_
            on user0_.id=profiles1_.user_id
    order by
        user0_.id
Hibernate:
    select
        profiles0_.user_id as user2_1_,
        profiles0_.id as id1_,
        profiles0_.id as id1_0_,
        profiles0_.user_id as user2_1_0_,
        profiles0_.email as email1_0_,
        profiles0_.phone as phone1_0_,
        profiles0_.mobile as mobile1_0_,
        profiles0_.address as address1_0_,
        profiles0_.postcode as postcode1_0_
    from
        users.profile profiles0_
    where
        profiles0_.user_id=?
1hongten[com.b510.example.Profile@10c0f66]
Hibernate:
    select
        profiles0_.user_id as user2_1_,
        profiles0_.id as id1_,
        profiles0_.id as id1_0_,
        profiles0_.user_id as user2_1_0_,
        profiles0_.email as email1_0_,
        profiles0_.phone as phone1_0_,
        profiles0_.mobile as mobile1_0_,
        profiles0_.address as address1_0_,
        profiles0_.postcode as postcode1_0_
    from
        users.profile profiles0_
    where
        profiles0_.user_id=?
2hanyuan[com.b510.example.Profile@e265d0]
Hibernate:
    select
        profiles0_.user_id as user2_1_,
        profiles0_.id as id1_,
        profiles0_.id as id1_0_,
        profiles0_.user_id as user2_1_0_,
        profiles0_.email as email1_0_,
        profiles0_.phone as phone1_0_,
        profiles0_.mobile as mobile1_0_,
        profiles0_.address as address1_0_,
        profiles0_.postcode as postcode1_0_
    from
        users.profile profiles0_
    where
        profiles0_.user_id=?
3Hongwei1231[com.b510.example.Profile@8997d1]
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原文地址：https://www.cnblogs.com/baobeiqi-e/p/9884824.html