Wether it is possible

Hi Experts,
i need two help .. On my application i have two buttons say (save and add) and my task if i press add button the a new row as to be added in my JTable(Default Table model) and the added row are Editable
i edit data in the newly added row and i press save .. till this no problem i able to do.. but the problem i am facing is that i can add more that two rows and edit at a time ..if i edit the any duplicate row say i have transport_id as one of my column and it as value like 1001,1002.. if i entered 1001,1002 again the datas i entered in to database how can i do this...
i am using default table model.. and iam displaying row and columns in my JTable from the database dynamically..
Second help: Wether it is possible in my application the PREV and NEXT Operation(DEfaultTableModel).
Please kindly help me over this tasks...

Thanks for your reply..
i have return my own validation for this just tell me wether this work outs..
public void primaryCheck()
          lblStatus.setText("");
          DefaultTableModel md1 =(DefaultTableModel)info_table.getModel(); // info_table is my JTable instance
          Vector vctinfotab = md1.getDataVector();
         String Custidpri =vctinfotab.elementAt(1).toString(); //getting the first column for the info_table
         System.out.println(Custidpri);
         int cust2 =info_table.getEditingRow();
         Vector vCustid1 = new Vector();
         vCustid1 =(Vector)data1.elementAt(cust2);
         String Custidpri1 =vCustid1.elementAt(1).toString(); // getting the eddited first column for the jtable info_table
         if(Custidpri.equals(Custidpri1)) // comparing
              lblStatus.setText("Entered Customer Id Already Exists");
         else
// i nsert newly added row data here

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