private void RemoveButtonActionPerformed(java.awt.event.ActionEvent evt) {

    String url = "jdbc:derby://localhost:1527/Customers";
    String username = "username";
    String password = "password";

    try {
        Connection conn = DriverManager.getConnection(url, username, password);
        if (conn != null) {
            System.out.println("Connected");

            String sql = "UPDATE STOCKn"
            + "SET NUMBERINSTOCK = NUMBERINSTOCK -"+RemoveTextField1.getText()+" n"
            + "WHERE UPPER(name)=?";

            PreparedStatement statement = conn.prepareStatement(sql);

            statement.setString(1, RemoveTextField1.getText());
            statement.setString(2, RemoveAnItemTextField.getText().toUpperCase());

            int rowsUpdated = statement.executeUpdate();

            if (rowsUpdated > 0)
            {
                JOptionPane.showMessageDialog(null,"That item has been updated successfully");
            }
            else
            {
                JOptionPane.showMessageDialog(null,"That item is either not in the database or you have entered the wrong information");
            }
        }
    }catch (SQLException ex)
    {
        JOptionPane.showMessageDialog(null,ex.getMessage());
    }
      ResultSet rs = null;
         PreparedStatement ps = null;
      try{
       Connection conn = DriverManager.getConnection(url, username, password);
       ps = conn.prepareStatement("select * from Stock");
       rs = ps.executeQuery();

       SearchTable.setModel(DbUtils.resultSetToTableModel(rs));
    }catch(Exception ex){
        JOptionPane.showMessageDialog(null, ex.getMessage());
    }
}