how to apply filters in inserting records to sqlserver through android app

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SQL-Server

Mobile

Android

hello friends

i tried to create an android app which insert data to sql server using jdbc.
i want to apply a filter in insert method which notify user if he want to add same record again
i am using this code....but it is not working

public void insert(){
	        	 try{
	        	 Statement statement=connect.createStatement();
	        	 String myname=name.getText().toString();
	        	 ResultSet result=statement.executeQuery("select * from form1 where name='"+name.getText().toString()+"'");
	        	 String lname=result.toString();
	        	if(myname==lname){
	        		AlertDialog adb=new AlertDialog.Builder(this).create();
	        		adb.setMessage("want to overwrite????");
	        		adb.setButton("ok", new DialogInterface.OnClickListener(
	        				) {
						
						@Override
						public void onClick(DialogInterface dialog, int which) {
							// TODO Auto-generated method stub
							try{
							Statement statement1=connect.createStatement();
							statement1.executeUpdate("insert into FORM1(NAME,CITY) " +
				                    "values('"+name.getText().toString() +"', '"+city.getText().toString()+"')");
				        statement1.close();
							}catch(Exception e){
								Log.e("ERROR", e.getMessage());
							}
							
							
						}
					});
	        		adb.setButton("No", new DialogInterface.OnClickListener() {
						
						@Override
						public void onClick(DialogInterface dialog, int which) {
							// TODO Auto-generated method stub
							
						}
					});
	        		adb.show();
	        		
	        	}
	        	else{
	        		 Statement statement2=connect.createStatement();
	 	        	
	 	        	statement2.executeUpdate("insert into FORM1(NAME,CITY) " +
	 	                    "values('"+name.getText().toString() +"', '"+city.getText().toString()+"')");
	 	        statement2.close();
	        	}
	         }catch(Exception e){
	        	 Log.e("ERROR", e.getMessage());
	        	
	         }
	         }

plzz guys tell me correct code...

it's very urgent......