Re: Retrieving information from MySQL Database

"Jeff" <>
25 Sep 2006 19:02:29 -0700
<> wrote:

Hi. I am trying to retrieve information from a MySQL database and
placing it in a JTable. However the code I have used gets the results
and displays it in the system output. However no results are placed in
the JTable. Does anyone know the reason. Below is the code:

    public void showDatabase() {
        try {
            System.out.println("Showing database");
            Statement s = connection.createStatement();
            String query = "SELECT * FROM " +

pocket_money_calculator.Login.txtUser.getText() +
            ResultSet table = statement.executeQuery(query);

            // determine properties of table
            ResultSetMetaData meta = table.getMetaData();
            String[] colNames = new String[meta.getColumnCount()];
            Vector[] cells = new Vector[colNames.length];
            for (int col = 0; col < colNames.length; col++) {
                colNames[col] = meta.getColumnName(col + 1);
                cells[col] = new Vector();

            // hold data from result set
            while ( {
                for (int col = 0; col < colNames.length; col++) {
                    Object cell = table.getObject(colNames[col]);

            // print column headings
            for (int col = 0; col < colNames.length; col++) {
                System.out.print(colNames[col].toUpperCase() + "\t");

            // print data row-wise
            while (!cells[0].isEmpty()) {
                for (int col = 0; col < colNames.length; col++) {
                                     + "\t");
                JTable tblResults = new JTable();

        } catch (SQLException ex) {
            System.err.println("" + ex.toString());
        // exit more gently
        catch (Exception e) {

Any help would be apreciated. Thanks very much for your help

I am also working on a java/MySQL project, and have a couple
suggestions (I am a relative newcomer to Java, not exactly a newbie,
but not experienced either, yet). First, there is an excellent book
titled MySQL and Java Developer's Guide by Mark Matthews, published by
Wiley. I find it helpful. The other is a bit of a cheat, and that is a
component I have found immensely useful and rather easy to use called
QuickTable. In essence it is a data-aware JTable. Displaying data in
the table is as simple as getting your result set then:
but there is a large set of additional routines, allowing you to change
headers, print tables, etc.

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