how to perform database operations using rmi?

[Punit Jain]

hello, i am just trying to perform some database operations using rmi (ie. insert records into database).
i mean my database is on server and i want when client run the client program, some data should insert to the database which is on server.
Here is what i am trying:

DatabaseServer.java

import java.rmi.*;
import java.rmi.registry.*;
import java.rmi.server.*;
import java.net.*;
public class DatabaseServer extends UnicastRemoteObject implements DatabaseInterface
{
	int thisPort;
	String thisAddress;
	Registry registry;
	public void add()
	{
		System.out.println("This is to test the interface");
	}	
	public DatabaseServer() throws RemoteException
	{
		try{
			thisAddress = (InetAddress.getLocalHost()).toString();
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}
		thisPort = 3232;
		System.out.println("This Address= "+thisAddress+"Port= "+thisPort);
		try{
		        registry = LocateRegistry.createRegistry( thisPort );
			registry.rebind("rmiServer", this);
		}
		catch(Exception e){
			e.printStackTrace();
		}
	}
	public static void main(String agrs[])
	{
		try{
			DatabaseServer ss = new DatabaseServer();
		}
		catch(Exception e){
			e.printStackTrace();
			System.exit(1);
		}

	}
}

DatabaseClient.java

import java.rmi.*;
import java.rmi.registry.*;
import java.net.*;

public class RmiClient
{
    static public void main(String args[])
    {
       ReceiveMessageInterface rmiServer;
       Registry registry;
       String serverAddress=args[0];
       String serverPort=args[1];
       System.out.println("sending "+text+" to "+serverAddress+":"+serverPort);
       try{
           registry=LocateRegistry.getRegistry(
               serverAddress,
               (new Integer(serverPort)).intValue()
           );

           rmiServer=
              (ReceiveMessageInterface)(registry.lookup("rmiServer"));
       }
       catch(RemoteException e){
           e.printStackTrace();
       }
       catch(NotBoundException e){
           e.printStackTrace();
       }
    }
}

here is the interface "DatabaseInterface.java"

import java.rmi.*;
public interface DatabaseInterface extends Remote
{
	public void add() throws RemoteException;
}

but now how do i perform database operation???

[Chris Janicki]

Well, your client app has to call an RMI method on the server app. It looks like you've set up an add() method for that purpose. So after the client grabs the server reference (you've already done that), then call rmiServer.add(). Of course you still have some work to do… that add() method needs to be expanded to accept some parameters (the stuff you want to add), and the method signature line needs to throw RemoteException, since that's what your interface declares (and required for RMI methods).