使用JCreator向JTable添加行

Question

I want to add rows in JTable, but it didn't work well. Could someone help me? Table is displaying normal but not dynamically

//displays all data in Jtable
void refresh()
{
    Vector<Vector<String>> data = new Vector<>();

        ResultSet rs = st.executeQuery("SELECT * FROM tblInfo");

        while(rs.next())
        {           
        Vector<String> d = new Vector<>();
        d.add(rs.getString("ID"));  
        d.add(rs.getString("Name"));
        d.add(rs.getString("User"));
        d.add(rs.getString("Pass"));
        data.add(d);
        }


        Vector<String> header = new Vector<>();
        header.add("ID");
        header.add("Name");
        header.add("Username");
        header.add("Password");

        model = new DefaultTableModel(data, header);
        table = new JTable(model);
        st.close();
        rs.close();

        table.setBackground(Color.LIGHT_GRAY);
        table.setForeground(Color.white);
        scroll = new JScrollPane(table);
        getContentPane().add(scroll);

    st.close();
    rs.close();
}

//adding data to database
void addDoctor()
    {


        st.executeUpdate("INSERT INTO tblInfo(Name) VALUES ('Name')");  

    st.close();
}




public void actionPerformed(ActionEvent e){ 
    Object source = e.getSource();


    else if(btnAdd == source)
    {

        addDoctor();
        refresh();      
    }

Thanks for any response. :) I have edited this code before i've posted.

Answer 1

1) Don't create any Objects inside try - catch - finally block ; for Swing GUI, prepare these Objects before, better as local variables.

2) You created a new

model = new DefaultTableModel(data, header);
table = new JTable(model);

and those Object maybe never added to the already visible GUI. Swing GUI doesn't care somehow, and the container doesn't know that you changed (reset, reinitialize) the underlaying model and with JTable. You have to notify Swing GUI for changes, but this isn't the proper of way.

3) Don't to recreate this Object on runtime, reuse Objects that already exist, create JTable and DefaultTableModel only one time.

4) Reset DefaultTableModel by using model.setRowCount(0); and then to add a new rows from JDBC

5) Don't to reinvent the wheel, search for ResultSetTableModel or TableFromDatabase .

6) Move code lines st.close(); & rs.close(); to the finally block .

Answer 2

Use DefaultTableModel.setDataVector() to add a new Vector with the new Data to the existing TableModel/JTable. Or use the insertRow/removeRow methods. Or implement your own AbstractTableModel.