Jtable-编辑后获取表单元格数据

Question

I have a JTable with data from a database. I can pull the data that is currently in the table using

table.getValueAt(table.getSelectedRow(),3)    

What I cannot figure out is how to get the same cell's new data after editing in running App. I've tried running an update SQL command to push the new data but it does not update. I think I am missing a step. I've also attempted TableModelListener but I have had very little luck getting it to work as I need it to. This is what I have so far for assisting the retrieval and update of data:

private void UpdateDbFromJTable(){
    table.getSelectionModel().addListSelectionListener(new ListSelectionListener(){
        @Override
        public void valueChanged(ListSelectionEvent event) {
            if (table.getSelectedRow() > -1) {
                // print first column value from selected row
             String App = table.getValueAt(table.getSelectedRow(),0).toString();
             String Version = table.getValueAt(table.getSelectedRow(),1).toString();
             String Issue = table.getValueAt(table.getSelectedRow(),2).toString();
             String Resolved =table.getValueAt(table.getSelectedRow(),3).toString();


            try {
                String sql = "UPDATE Bugs SET Resolved =" + Resolved + "WHERE App = \" " + App + "' AND Version =\"" + Version + "\" AND Issue = \"" + Issue + "\"";
                conn = DriverManager.getConnection(DB_URL);
                stmt = conn.prepareStatement(sql);
                rs = stmt.executeUpdate();


            } catch (Exception e) {
                JOptionPane.showMessageDialog(null, e);

            }
             }

        }

    });


}

The Update statement is incorrect at this point because it is just updating "Resolved" to what it was already set to in the DB.

This is what is happening now that I have the update corrected. I get duplicate 'println'(s) that grows every time I click save after making a change to a different table entry: private void UpdateDbFromJTable(){

    table.getSelectionModel().addListSelectionListener(new ListSelectionListener(){
        @Override
        public void valueChanged(ListSelectionEvent event) {
            String App = null;
            String Version = null;
            String Issue = null;
            String Resolved = null;
             if (! event.getValueIsAdjusting())
                {
            if (table.getSelectedRow() > -1) {
                // print first column value from selected row
                App = table.getValueAt(table.getSelectedRow(),0).toString();
                Version = table.getValueAt(table.getSelectedRow(),1).toString();
                Issue = table.getValueAt(table.getSelectedRow(),2).toString();
                Resolved =table.getValueAt(table.getSelectedRow(),3).toString();

                System.out.println(App + "  " + Version + "  " + Issue +  "  " + Resolved);
                }

                }
             if(table.isEditing()){
                    table.getCellEditor().stopCellEditing();

            try {


                conn = DriverManager.getConnection(DB_URL);
                String sql = "UPDATE Bugs SET Resolved = ? WHERE App = ? AND Version = ? AND Issue = ?";
                PreparedStatement stmt = conn.prepareStatement(sql);
                stmt.setString(1, Resolved);
                stmt.setString(2, App);
                stmt.setString(3, Version);
                stmt.setString(4, Issue);
                stmt.executeUpdate();





            } catch (Exception e) {
                JOptionPane.showMessageDialog(null, e);

            }
             }

        }

    });


}

My save Button:

btnSave.addActionListener(new ActionListener(){
        public void actionPerformed(ActionEvent e){
            UpdateDbFromJTable();
            JTable();

        }
    });

And My JTable():

Connection conn = null;
ResultSet rs = null;
PreparedStatement stmt = null;
private JTable table;
private void JTable() {
    String sql = "SELECT * FROM Bugs";
    try {
        conn = DriverManager.getConnection(DB_URL);
        stmt = conn.prepareStatement(sql);
        rs = stmt.executeQuery();
        table.setModel(DbUtils.resultSetToTableModel(rs));



    } catch (Exception e) {
        JOptionPane.showMessageDialog(null, e);

    }


}

Answer 1

I'm guessing your editor is still active so the data hasn't been saved to the model yet.

So you need to stop editing in your ActionListener:

if (table.isEditing())
     table.getCellEditor().stopCellEditing();

Check out Table Stop Editing for more information and another approach

Also, use a PreparedStatment for your SQL it is easier to maintain and less error prone:

String sql = "UPDATE Page SET Title = ? WHERE Name = ?";

PreparedStatement stmt = connection.prepareStatement(sql);

stmt.setString( 1, "update" );
stmt.setString( 2, "Name3" );
stmt.executeUpdate();
stmt.close();

Answer 2

you can try adding TableModelListener this way which executes once the table has changed. Something like:

tableModel.addTableModelListener(new TableModelListener(){
    @Override
    public void tableChanged(TableModelEvent tableModelEvent) {
        if(table.isEditing())
        String value = table.getValueAt(table.getSelectedRow(),3);    
        //do stuff  with value          
    }
});

Answer 3

I finally figured out why it was duplicating thanks to @camickr for pointing out that it was creating multiple Listeners. I moved the listener around the button itself.

 table.getSelectionModel().addListSelectionListener(new ListSelectionListener() {
            @Override
            public void valueChanged(ListSelectionEvent event) {

                if (!event.getValueIsAdjusting()) {
                    if (table.getSelectedRow() > -1) {
                        // print first column value from selected row
                        app = table.getValueAt(table.getSelectedRow(), 0).toString();
                        version = table.getValueAt(table.getSelectedRow(), 1).toString();
                        issue = table.getValueAt(table.getSelectedRow(), 2).toString();
                        resolved = table.getValueAt(table.getSelectedRow(), 3).toString();
                        System.out.println(app + "  " + version + "  " + issue + "  " + resolved);

                    }
                }
                btnSave.addActionListener(new ActionListener() {
                    public void actionPerformed(ActionEvent e) {

                        updateDbFromJTable();
                        //jTable();
                    }
                });
            }
        });