单击关闭按钮后，从Mysql db显示JTable上的数据

Question

我一直试图将数据插入MYSql数据库，同时在JTable中显示数据。问题是我无法将数据存储到数据库中，但我能够在JTable中显示。我已将db连接字符串放在另一个类中，如下所示

    public class DatabaseConnection {



public static Connection getDBConnection() {
    Connection connection;
    try {
        Class.forName("com.mysql.jdbc.Driver").newInstance();
        connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/accounting","root","jinXED007");
        return connection;
    } catch (Exception ex) {
    return null;
    }

}

}

以及实现JTable的方法如下

            table = new JTable(dTableModel);

    try{

        Class.forName("com.mysql.jdbc.Driver");
        conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/accounting","root","jinXED007");

        Statement sqlState = conn.createStatement
                (ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);

        String selectStuff = "Select customerid,name,address,town,postal_code,tel_no,contact_person from customer";

        rows = sqlState.executeQuery(selectStuff);

        Object[] tempRow;

        while (rows.next()) {

            tempRow = new Object[] { rows.getInt(1), rows.getString(2),
                    rows.getString(3), rows.getString(4), rows.getString(5) ,rows.getInt(6),rows.getString(7)};

            dTableModel.addRow(tempRow);
        }


    }

    catch (SQLException ex) {

        // String describing the error

        System.out.println("SQLException: " + ex.getMessage());

        // Vendor specific error code

        System.out.println("VendorError: " + ex.getErrorCode());
    } catch (ClassNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    table.setAutoCreateRowSorter(true);


    table.setFont(new Font("Segoe UI", Font.PLAIN, 12));
    table.setBorder(new EtchedBorder(EtchedBorder.RAISED, null, null));
    scrollPane.setViewportView(table);

而actionlistener如下

    btnSave.addActionListener(new ActionListener(){

        @Override
        public void actionPerformed(ActionEvent arg0) {
            String sCustomerID="",sCustomerName="",sAddress="",sCity="",sPostalCode="",sTelNo="",sContactPerson="";



            sCustomerID=txtcustomernumber.getText();
            sCustomerName=txtcustomername.getText();
            sAddress=txtaddress.getText();
            sCity=txtcity.getText();
            sPostalCode=txtpostalcode.getText();
            sTelNo=txttelno.getText();
            sContactPerson=txtcontactperson.getText();

            try {


                // Moves the database to the row where data will be placed

                rows.moveToInsertRow();

                // Update the values in the database

                rows.updateString("customerid", sCustomerID);
                rows.updateString("name", sCustomerName);

                rows.updateString("address", sAddress);
                rows.updateString("town", sCity);

                rows.updateString("postal_code", sPostalCode);
                rows.updateString("tel_no", sTelNo);

                rows.updateString("contact_person",sContactPerson );



                // Inserts the changes to the row values in the database

                rows.insertRow();

                // Directly updates the values in the database

                rows.updateRow();

            } catch (SQLException e1) {

                e1.printStackTrace();
            }
            //int sCustomerid = 0;

            try {

                // Go to the last row inserted and get the id

                rows.last();

                //sCustomerid = rows.getInt(1);
            } catch (SQLException e1) {

                e1.printStackTrace();
            }

            Object[] customer = {sCustomerID,sCustomerName,sAddress,
                    sCity,sPostalCode,sTelNo,sContactPerson };

            // Add the row of values to the JTable

            dTableModel.addRow(customer);

        }

    });