private void loginActionPerformed(java.awt.event.ActionEvent evt) {

    protected static javax.swing.JTexfield userTF;

    try{

    String pass = passTF.getText().trim();
    String user = userTF.getText().trim();
    String sql = "select uname,pass"
            + " from login "
            + "where uname = '"+user+"' "
            + "AND pass = '"+pass+"'";
   pst = (OraclePreparedStatement) conn.prepareStatement(sql);
   rs = (OracleResultSet) pst.executeQuery(sql);

      // remaining code
   }

      //catch block

   }

private void ConOrd2ActionPerformed(java.awt.event.ActionEvent evt) {
    try{
     signin l = new signin();
        l.getComponent(0).getName();
        int rows = jTable23.getRowCount();
          String user4 = l.userTF.getText().trim();
      String sqli = "insert into orders"
            + "(o_id,item_id, order_name, uname)"
            + " values (ord_seq.nextval,?,?,'"+user4+"')";

          //o_id,item_id,order_name is inserted and uname value is added as
   //Null instead of the username value in the JTextfield in the Signin page.

        pst = (OraclePreparedStatement) conn.prepareStatement(sqli);
        for(int row =0; row < rows; row++)
        {
            String item2= (String)jTable23.getValueAt(row, 0);
            String fooname2= (String)jTable23.getValueAt(row, 1);
            pst.setString(1, item2);
            pst.setString(2, fooname2);
            pst.execute();
        }
        pst.executeUpdate();
        conn.commit();

    }

    catch(Exception e)
    {
        System.out.println(e);
    }
}