array list

[shanmukhi]

hi,

how can i attach an iterator to array list and how can i get objects from database into that array list and how can i display that data on browser....

can any one help me........

[r035198x]

hi,

how can i attach an iterator to array list and how can i get objects from database into that array list and how can i display that data on browser....

can any one help me........

Now step by step will do it.

 ArrayList list = new ArrayList(); 
Iterator iterator = list.iterator();

Creates the iterator from the list. Are you using jdbc to get the data from the database? How do you want to present the data to the web page? Are you using JSP? What have you done so far?

[shanmukhi]

Now step by step will do it.

 ArrayList list = new ArrayList(); 
Iterator iterator = list.iterator();

Creates the iterator from the list. Are you using jdbc to get the data from the database? How do you want to present the data to the web page? Are you using JSP? What have you done so far?

im using hibernate......
see my code

org.hibernate.Transaction tx = session.beginTransaction();   

//like createstatement in jdbc and cityes is my table in mysql 
 Query q = session.createQuery("from cityes");
          
            Iterator it=q.iterate();
            
            while(it.hasNext())
            {
            	System.out.println(it.next());
            	
            }

but iam not getting the data from table.........
my output is null

is there any way to retrieve by linking iterator to array list..
can u suggest a way to write code

[r035198x]

im using hibernate......
see my code

org.hibernate.Transaction tx = session.beginTransaction(); 
 
//like createstatement in jdbc and cityes is my table in mysql 
Query q = session.createQuery("from cityes");
 
Iterator it=q.iterate();
 
while(it.hasNext())
{
	System.out.println(it.next());
 
}

but iam not getting the data from table.........
my output is null

is there any way to retrieve by linking iterator to array list..
can u suggest a way to write code

Hold on there. Are getting null printed to the screen or are you getting nothing printed to the screen?

[shanmukhi]

Hold on there. Are getting null printed to the screen or are you getting nothing printed to the screen?

my output printed as null...

i changed my code again as like this

 SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
		      session =sessionFactory.openSession();    
		      Query q = session.createQuery(" from cityes ");
		      Iterator it;
		      for (it=q.iterate(); it.hasNext();) {
		        cityes c = (cityes) it.next();
		        System.out.println("city: " + c.getCity());
		        System.out.println("state: " + c.getState());
		        System.out.println("country: " + c.getCountry());

in this scenario i didn't understand the use of

cityes c=(cityes)it.ne xt();

can u explain what is the use of this line?

now iam getting ouput as

city: mangalore
Hibernate: select cityes0_.city as city0_, cityes0_.state as state0_0_, cityes0_.countr y as country0_0_ from cityes cityes0_ where cityes0_.city=?
state: karnataka
country: india

city: hyderabad
Hibernate: select cityes0_.city as city0_, cityes0_.state as state0_0_, cityes0_.countr y as country0_0_ from cityes cityes0_ where cityes0_.city=?
state: andhra
country: india

one thing here i want to know ,that is why im getting Hibernate: statement after displaying city:mangalore.

how can i get city,state,coun try in sequence.

[r035198x]

my output printed as null...

i changed my code again as like this

SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
		 session =sessionFactory.openSession(); 
		 Query q = session.createQuery(" from cityes ");
		 Iterator it;
		 for (it=q.iterate(); it.hasNext();) {
		 cityes c = (cityes) it.next();
		 System.out.println("city: " + c.getCity());
		 System.out.println("state: " + c.getState());
		 System.out.println("country: " + c.getCountry());

in this scenario i didn't understand the use of

cityes c=(cityes)it.ne xt();

can u explain what is the use of this line?

now iam getting ouput as

city: mangalore
Hibernate: select cityes0_.city as city0_, cityes0_.state as state0_0_, cityes0_.countr y as country0_0_ from cityes cityes0_ where cityes0_.city=?
state: karnataka
country: india

city: hyderabad
Hibernate: select cityes0_.city as city0_, cityes0_.state as state0_0_, cityes0_.countr y as country0_0_ from cityes cityes0_ where cityes0_.city=?
state: andhra
country: india

one thing here i want to know ,that is why im getting Hibernate: statement after displaying city:mangalore.

how can i get city,state,coun try in sequence.

 cityes c=(cityes)it.next();

it.next() moves to the next item in the iterator. This will be an Object but you will want to type cast it to a cityes object to be able to call it's getCountry() method (and all of its other method)

Can you post the complete program including the cityes class if you have it.

[shanmukhi]

 cityes c=(cityes)it.next();

it.next() moves to the next item in the iterator. This will be an Object but you will want to type cast it to a cityes object to be able to call it's getCountry() method (and all of its other method)

Can you post the complete program including the cityes class if you have it.

This is gettingcityes.j ava
where i written code to get data

package cities;
import java.util.Iterator;

import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
public class gettingcityes {
	public static void main(String[] args)
	{
		Session session = null;   
		try{
		      SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
		      session =sessionFactory.openSession();    
		      Query q = session.createQuery(" from cityes ");
		      Iterator it=q.iterate();
		      for (it=q.iterate(); it.hasNext();) {
		        cityes c = (cityes) it.next();
		        System.out.println("city: " + c.getCity());
		        System.out.println("state: " + c.getState());
		        System.out.println("country: " + c.getCountry());
		        }
		      
		   
            	session.close();
		    
		 }		  			 
		           	
	catch(Exception e)
	{   
		System.out.println(e.getMessage());  
	}
	finally{   
		}
}}

cityes.java is my POJO class
where i written setters and getter methods..

package cities;

public class cityes {
		 
	                    private String city;  
		    private String state;  
		    private String country; 
		    private long id;  
		
		public String getCity() 
                                 {
		return city;
		}
		public void setCity(String city) 
                                {
		this.city = city;
		}
		public String getCountry() 
                               {
		return country;
		}
		public void setCountry(String country) 
                                {
		this.country = country;
		}
			public String getState() 
                                  {
		return state;
		}
		public void setState(String state) 
                                   {
		this.state = state;
		}
	}

[r035198x]

This is gettingcityes.j ava
where i written code to get data

package cities;
import java.util.Iterator;
 
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
public class gettingcityes {
	public static void main(String[] args)
	{
		Session session = null; 
		try{
		 SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
		 session =sessionFactory.openSession(); 
		 Query q = session.createQuery(" from cityes ");
		 Iterator it=q.iterate();
		 for (it=q.iterate(); it.hasNext();) {
		 cityes c = (cityes) it.next();
		 System.out.println("city: " + c.getCity());
		 System.out.println("state: " + c.getState());
		 System.out.println("country: " + c.getCountry());
		 }
 
 
	session.close();
 
		 }					 
 
	catch(Exception e)
	{ 
		System.out.println(e.getMessage()); 
	}
	finally{ 
		}
}}

cityes.java is my POJO class
where i written setters and getter methods..

package cities;
 
public class cityes {
 
	 private String city; 
		 private String state; 
		 private String country; 
		 private long id; 
 
		public String getCity() 
{
		return city;
		}
		public void setCity(String city) 
{
		this.city = city;
		}
		public String getCountry() 
{
		return country;
		}
		public void setCountry(String country) 
{
		this.country = country;
		}
			public String getState() 
{
		return state;
		}
		public void setState(String state) 
{
		this.state = state;
		}
	}

Change your exception handling to

 catch(Exception e) 
	{ 
		e.printStackTrace(); 
	}

Remove the finally block. Now run it and tell us what it prints.

Note it is common practice to name classes beginning with a capital letter e.g GettingCityes and Cityes

[shanmukhi]

Change your exception handling to

 catch(Exception e) 
	{ 
		e.printStackTrace(); 
	}

Remove the finally block. Now run it and tell us what it prints.

Note it is common practice to name classes beginning with a capital letter e.g GettingCityes and Cityes

i got the same result........

then-
what is the difference between getMessage and printStackTrace

[r035198x]

i got the same result........

then-
what is the difference between getMessage and printStackTrace

Not much.
I can't see why you are having the hibernate statement printed. I thought may be It was ... ah but then it couldn't have been. Are you sure you've compiled the files again before testing?

[shanmukhi]

Not much.
I can't see why you are having the hibernate statement printed. I thought may be It was ... ah but then it couldn't have been. Are you sure you've compiled the files again before testing?

im using eclipse........

so no need of bothering about those things ........

and can u tell me how can i perform updations using hibernate...... .
im able to insert but how to delete......... ...