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    private void voegIngToe() {            try            {              Statement query = db.createStatement();              String naam = naamVeld.getText();              Double p = new Double(prijsVeld.getText().trim());              double prijs = p.doubleValue();              String eenheid = eenheidVeld.getText();              String sql ="INSERT INTO Voorraad (naam,kost,perEenheid)" + "VALUES ('" + naam + "'," + prijs +",'" + eenheid + "')";              query.executeUpdate(sql);            } //END try() TO WRITE RECORD            //CATCH NUMBER FORMAT EXCEPTION FOR PRICE FIELD            catch (NumberFormatException nfe)            {              JOptionPane.showMessageDialog(null,"\n\nWRITE FILE ERROR\n"                                        + "MAKE SURE PRICE OR AMOUNT IS CORRECT\n"                                        + nfe.toString());            }//END NumberFormatcatch()            //CATCH ANY EXCEPTIONS WRITING TO FILE            catch (SQLException io)            {                 JOptionPane.showMessageDialog(null,"\nERROR WRITING FILE\n"+ io.toString());            }//END IO catch()            //CLEAR TEXT FIELDS            naamVeld.setText("");            prijsVeld.setText("");            eenheidVeld.setText("");            return true;    }