hibernate取值问题

1. 查询整个映射对象所有字段
Java代码  

   //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.查询单个字段
Java代码  

   //查询单个字段    
           String hql = " select name from Users";    
           Query query = session.createQuery(hql);    
               
           List<String> list = query.list();    
           for(String str : list){    
               System.out.println(str);    
           }    
   输出结果为：    
   name1    
   name2    
   name3    



3.查询其中几个字段

Java代码  

   //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    



4.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
引用
//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
        */

5.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
Java代码  收藏代码

   //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  
            */    


6.修改默认查询结果(query.list())不以Object[]数组形式返回，以Set形式返回,但是因为Set里是不允许有重复的元素，所以:username和password的值不能相同。只需将hql改为：String hql = " select new set(name,passwd) from Users";

7.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

自定义类：

Java代码

   package com.domain;    
       
   public class MyUser {    
       
       private String username;    
       private String password;    
   //因为：String hql = " select new  com.domain.MyUser(name,passwd) from Users";所以必须要有接受2个参数的构造函数    
       public MyUser(String username,String password){    
           this.username = username;    
           this.password = password;    
       }    
           
       public String getUsername() {    
           return username;    
       }    
       public void setUsername(String username) {    
           this.username = username;    
       }    
       public String getPassword() {    
           return password;    
       }    
       public void setPassword(String password) {    
           this.password = password;    
       }    
           
           
   }    




Java代码

   //通过query.list()出来的list里存放的不再是默认的Object数组了,而是自定义的类MyUser,必须加包名，String hql = "from Users";中的Users类也是必须加包名的，但是因为再Users.hbm.xml里<hibernate-mapping auto-import="true"> auto-import默认值为true（所以auto-import属性也可以不写）,自动导入了    
           String hql = " select new  com.domain.MyUser(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MyUser对象了    
           List<MyUser> myUsers = query.list();    
           for(MyUser myUser : myUsers){    
               String name = myUser.getUsername();    
               String passwd = myUser.getPassword();    
               System.out.println(name + " : " + passwd);    
           }    
           /**  
           输出结果为：  
           name1 : password1  
           name2 : password2  
           name3 : password3  
            */    



8：条件查询
Java代码

   //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());    
           }    

       
Java代码

   //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());    
           }    



Java代码

   //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 = new MyUser("name1","password1");    
           query.setProperties(myUser);    
           List<Users> list = query.list();    
           for(Users users : list){    
               System.out.println(users.getId());    
           }  

[java] view plaincopy

   package com.hp.ts.bca.user.bo;  
     
   import com.hp.ts.bca.common.BaseObject;  
     
   public class StationUser  extends BaseObject {  
       private static final long serialVersionUID = -1175811459644997844L;  
       private int id;  
       private String username;  
       private String officePhone;  
       private String mobilePhone1;  
       private String officeEmail;  
       private Integer ifDefault;  
       public StationUser(int id, String username, String officePhone,  
               String mobilePhone1, String officeEmail, Integer ifDefault) {  
           super();  
           this.id = id;  
           this.username = username;  
           this.officePhone = officePhone;  
           this.mobilePhone1 = mobilePhone1;  
           this.officeEmail = officeEmail;  
           this.ifDefault = ifDefault;  
       }  
       public int getId() {  
           return id;  
       }  
       public void setId(int id) {  
           this.id = id;  
       }  
       public String getUsername() {  
           return username;  
       }  
       public void setUsername(String username) {  
           this.username = username;  
       }  
       public String getOfficePhone() {  
           return officePhone;  
       }  
       public void setOfficePhone(String officePhone) {  
           this.officePhone = officePhone;  
       }  
       public String getMobilePhone1() {  
           return mobilePhone1;  
       }  
       public void setMobilePhone1(String mobilePhone1) {  
           this.mobilePhone1 = mobilePhone1;  
       }  
       public String getOfficeEmail() {  
           return officeEmail;  
       }  
       public void setOfficeEmail(String officeEmail) {  
           this.officeEmail = officeEmail;  
       }  
       public Integer getIfDefault() {  
           return ifDefault;  
       }  
       public void setIfDefault(Integer ifDefault) {  
           if(ifDefault==null)  
               ifDefault=0;  
           else  
               this.ifDefault = ifDefault;  
       }  
       @Override  
       public int hashCode() {  
           final int prime = 31;  
           int result = 1;  
           result = prime * result + id;  
           result = prime * result  
                   + ((ifDefault == null) ? 0 : ifDefault.hashCode());  
           result = prime * result  
                   + ((mobilePhone1 == null) ? 0 : mobilePhone1.hashCode());  
           result = prime * result  
                   + ((officeEmail == null) ? 0 : officeEmail.hashCode());  
           result = prime * result  
                   + ((officePhone == null) ? 0 : officePhone.hashCode());  
           result = prime * result  
                   + ((username == null) ? 0 : username.hashCode());  
           return result;  
       }  
       @Override  
       public boolean equals(Object obj) {  
           if (this == obj)  
               return true;  
           if (obj == null)  
               return false;  
           if (getClass() != obj.getClass())  
               return false;  
           StationUser other = (StationUser) obj;  
           if (id != other.id)  
               return false;  
           if (ifDefault == null) {  
               if (other.ifDefault != null)  
                   return false;  
           } else if (!ifDefault.equals(other.ifDefault))  
               return false;  
           if (mobilePhone1 == null) {  
               if (other.mobilePhone1 != null)  
                   return false;  
           } else if (!mobilePhone1.equals(other.mobilePhone1))  
               return false;  
           if (officeEmail == null) {  
               if (other.officeEmail != null)  
                   return false;  
           } else if (!officeEmail.equals(other.officeEmail))  
               return false;  
           if (officePhone == null) {  
               if (other.officePhone != null)  
                   return false;  
           } else if (!officePhone.equals(other.officePhone))  
               return false;  
           if (username == null) {  
               if (other.username != null)  
                   return false;  
           } else if (!username.equals(other.username))  
               return false;  
           return true;  
       }  
       @Override  
       public String toString() {  
           return "StationUser [id=" + id + ", username=" + username  
                   + ", officePhone=" + officePhone + ", mobilePhone1="  
                   + mobilePhone1 + ", officeEmail=" + officeEmail  
                   + ", ifDefault=" + ifDefault + "]";  
       }  
         
         
     
     
     
   }  


[java] view plaincopy

   @Override  
       public PageResponse<User> getUserListByStationId(int currentPage,  
               int rowsPerPage, String sidx, String sord, Integer stationId) {  
           StringBuilder hql = new StringBuilder();  
           hql.append("select new com.hp.ts.bca.user.bo.StationUser(a.id,a.username,a.officePhone,a.mobilePhone1,a.officeEmail,ug.ifDefault) FROM User a, UserGroup ug WHERE a.id=ug.userId and ug.groupId=");  
           hql.append(stationId);  
           //hql.append("FROM User AS user, UserGroup AS ug WHERE user.id=ug.userId");  
           PageResponse<User> userList = this.groupDao.excutePage(hql.toString(),  
                   currentPage, rowsPerPage, sidx, sord);  
           return userList;  
       }