try {
        Class.forName("com.mysql.jdbc.Driver");
        Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/sakila", "root", "abc123");
        Statement st = con.createStatement();
        ResultSet rs = st.executeQuery("Select * from actor");

        while(jTable1.getRowCount() > 0){
            ((DefaultTableModel)jTable1.getModel()).removeRow(0);
        }

        int col = rs.getMetaData().getColumnCount();
        while(rs.next()){
            Object [] rows = new Object[col];
            for(int i = 1; i<=col; i++){
                rows[i-1] = rs.getObject(i);
            }
            ((DefaultTableModel)jTable1.getModel()).insertRow(rs.getRow() - 1, rows);
        }

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

    } catch (ClassNotFoundException ex) {
        Logger.getLogger(MainFrame.class.getName()).log(Level.SEVERE, null, ex);
    }
}