Clear JTextArea after updating MySql Database

I am entering data from jtextfields going to the database, then the data from the database going to be displayed back to the JTextArea of my java.

My problem is after entering succeeding data in database when they are displayed, the previous data is redisplayed to the jtextarea. What I need to do is to clear the jtextarea before a new data is displayed.

public void saveDaily() {
  actionListener = new ActionListener() {
    public void actionPerformed(ActionEvent actionEvent) {
      tPrice();
      try {
        Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/computer_inventory", "root", "");
        PreparedStatement pstate = con.prepareStatement("INSERT INTO sales" + " VALUES (?,?,?,?)");
        pstate.setString(1, view.tf9.getText());
        pstate.setString(2, view.tf6.getText());
        pstate.setString(3, view.tf7.getText());
        pstate.setString(4, view.lTotal2.getText());
        pstate.executeUpdate();


        JOptionPane.showMessageDialog(null, "Successfully Added");
        view.tf9.setText("");
        view.tf6.setText("");
        view.tf7.setText("");
        view.lTotal2.setText("");

        displayData();
        view.ta1.setText(null);
        con.close();
      } catch (SQLException ex) {
        ex.printStackTrace();
        JOptionPane.showMessageDialog(null, "Error");
      }
    }
  };
  view.getDlyButton().addActionListener(actionListener);
}

public void displayData() {
  try {
    Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/computer_inventory", "root", "");
    Statement st = con.createStatement();
    String query = "SELECT * FROM sales";
    ResultSet rs = st.executeQuery(query);

    while (rs.next()) {
      String ProductName = rs.getString("ProductName");
      String Price = rs.getString("Price");
      String Quantity = rs.getString("Quantity");
      String TotalSale = rs.getString("TotalSale");

      view.ta1.append(" The Product: " + ProductName + " With a price of: " + Price
          + " peso" + " for : " + Quantity + " pieces"
          + "\n have a TOTAL COST of: " + TotalSale + " \n\n");
    }
  } catch (SQLException ex) {
    ex.printStackTrace();
  }
}