[JAVA]problema inserimento dati query

[niuzz0]

Salvea tutti, mi servirebbe il vostro aiuto.
Non riesco ad eseguire una query da un'interfaccia in java
Ho provato in tutti i modi ma sembra che non ne voglia proprio sapere.
Il bello è che il problema risulta solo con INSERT.

Vi lascio il codice che utilizzo

public class Query{


    /**
     * @param args
     * @throws ClassNotFoundException 
     * @throws SQLException 
     */
    public static void main(String[] args) throws ClassNotFoundException, SQLException {
        Class.forName("com.mysql.jdbc.Driver");
        String url = "jdbc:mysql://localhost:3306/ia";
        Connection con=DriverManager.getConnection(url,"root","");
        final Statement st = con.createStatement(); 
        
        final JTable table = new JTable();
        JScrollPane scrollPane = new JScrollPane(table);
        table.setFillsViewportHeight(true);
        table.setPreferredScrollableViewportSize(new Dimension(600,600));
        final JTextArea t=new JTextArea(5,20);
        t.setText("inserisci qui le query");
        t.setLineWrap(true);
        JScrollPane js2 = new JScrollPane(t);
        JButton b= new JButton("Invia Query");
        
        b.addActionListener(new ActionListener(){


            @Override
            public void actionPerformed(ActionEvent arg0) {
                try {
                    ResultSet rs=st.executeQuery(t.getText());
                    table.setModel(buildTableModel(rs));
                } catch (SQLException e) {
                    JOptionPane.showMessageDialog(null, "query non valida");
                }
            }});
        
        JButton bq1= new JButton("Nuovo");
        
        bq1.addActionListener(new ActionListener(){


            @Override
            public void actionPerformed(ActionEvent arg0) {
                try {
                    ResultSet rs= query1(st);
                    table.setModel(buildTableModel(rs));
                } catch (SQLException e) {
                    JOptionPane.showMessageDialog(null, "query non valida");
                }
                catch (InputNotMatchingException i){
                    JOptionPane.showMessageDialog(null, i.getMessage());
                }
            }});
        
        JPanel panel= new JPanel();
        JPanel panel2= new JPanel();
        
    
        panel.add(scrollPane);
        panel.add(b);
        panel2.add(bq1);
        panel2.add(bq2);
        panel2.add(bq3);
        panel2.add(bq4);
        panel.add(js2);
        panel.add(panel2);
        JFrame frame= new JFrame();
        frame.add(panel);
        frame.setSize(1000, 700);
        frame.setVisible(true);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
    
    public static ResultSet query1(Statement s) throws InputNotMatchingException, SQLException{
        String a,b,c,d,e,f,g,h,i,l,m,n,o,p,q;
        a=JOptionPane.showInputDialog(null, "inserisci campo1");
        b=JOptionPane.showInputDialog(null, "inserisci campo2");
        c=JOptionPane.showInputDialog(null, "inserisci campo3");
        d=JOptionPane.showInputDialog(null, "inserisci campo4");
        e=JOptionPane.showInputDialog(null, "inserisci campo5");
        f=JOptionPane.showInputDialog(null, "inserisci campo6");
        g=JOptionPane.showInputDialog(null, "inserisci campo7");
        h=JOptionPane.showInputDialog(null, "inserisci campo8");
        i=JOptionPane.showInputDialog(null, "inserisci campo9");
        l=JOptionPane.showInputDialog(null, "inserisci campo10");
        m=JOptionPane.showInputDialog(null, "inserisci campo11");
        n=JOptionPane.showInputDialog(null, "inserisci campo12");
        o=JOptionPane.showInputDialog(null, "inserisci campo13");
        p=JOptionPane.showInputDialog(null, "inserisci campo14");
        q=JOptionPane.showInputDialog(null, "inserisci campo15");

        return s.executeQuery("insert into foglio1 `titolo`, `autore` values `\""+a+"\"',`\""+b+"\"')");
        
        }
        
        public static DefaultTableModel buildTableModel(ResultSet rs)
            throws SQLException {


        ResultSetMetaData metaData = rs.getMetaData();


        // names of columns
        Vector<String> columnNames = new Vector<String>();
        int columnCount = metaData.getColumnCount();
        for (int column = 1; column <= columnCount; column++) {
            columnNames.add(metaData.getColumnName(column));
        }


        // data of the table
        Vector<Vector<Object>> data = new Vector<Vector<Object>>();
        while (rs.next()) {
            Vector<Object> vector = new Vector<Object>();
            for (int columnIndex = 1; columnIndex <= columnCount; columnIndex++) {
                vector.add(rs.getObject(columnIndex));
            }
            data.add(vector);
        }


        return new DefaultTableModel(data, columnNames);


    }


}