String action = "Insert";
    private void btnSaveActionPerformed(java.awt.event.ActionEvent evt) {                                        
        ConnectionFirebird firebird = new ConnectionFirebird();
        Connection con = firebird.Connectar();
        
        String ap1, ap2, ap3, dat, ad, sn, w;
        String sSQL = "";
        String message = "";
        
        ap1 = txtLname.getText();
        ap2 = txtName.getText(); 
        ap3 = txtPatronymic.getText();
        dat = txtDate.getText();
        ad = txtAddress.getText();
        w = txtWork.getText();
        sn = txtSocnum.getText();
        
        if(action.equals("Insert"))
        {
            sSQL = "INSERT INTO client (fname, surname, patronymic, born, address, work, socnum) " +
                    "VALUES(?, ?, ?, ?, ?, ?, ?)";
            message = "Данные были загружены успешно";
        }
        else if(action.equals("Update"))
        {
            sSQL = "UPDATE client " +
                    "SET fname = ?," +
                    "surname = ?," +
                    "patronymic = ?," +
                    "born = ?," +
                    "address = ?," +
                    "work = ?," +
                    "socnum = ? " +
                    "WHERE id = " + id_actual;
            message = "Данные были изменены успешно";
        } else {
        }
        try 
        {
            PreparedStatement pst = con.prepareStatement(sSQL);
            pst.setString(1, ap2);
            pst.setString(2, ap1);
            pst.setString(3, ap3);
            pst.setString(4, dat);
            pst.setString(5, ad);
            pst.setString(6, w);
            pst.setString(7, sn); 
                   
            int n = pst.executeUpdate();
            
            if(n > 0)
            {
                JOptionPane.showMessageDialog(null, message);
                tableClient("");
            }
                
        } 
        catch (SQLException ex) 
        {    
            JOptionPane.showMessageDialog(null, ex);
        }
                
                
    }