当我在 JavaFx 中的场景 2 视图中时，如何更新场景 1 数据视图？

问：

我面临的问题是我正在尝试通过 excel 文件获取数据并将其插入到我的数据库中，之后表上的数据应该更新，但它没有发生。

这是我的主类，它导致打开一个新框架，我可以通过该框架上传 excel 数据并将其插入到我的数据库中。

AddNewAccountHolderController.java文件。

@FXML
void onImport() {
    ImportAccountHoldersData accountHolder = new ImportAccountHoldersData();
    Stage stage = new Stage();
    try {
        accountHolder.start(stage);
    } catch (Exception e) {
        throw new RuntimeException(e);
    }

}

此函数打开一个新视图，其控制器为 。现在在这个控制器中，我有一个插入函数，用于将数据插入数据库。ImportAccountHoldersDataController.java

功能如下：

@FXML
void onInsert() {
    try {
        // Check if the table is not empty
        if (accountHoldersTableView.getItems().isEmpty()) {
            MessageDialogs.showErrorMessage("No account holders to insert.");
            return; // Exit the method since there's nothing to insert
        }

        DatabaseConnection db = new DatabaseConnection();
        CallableStatement statement = db.connection.prepareCall("{CALL sp_create_account_holder(?, ?, ?, ?, ?, ?)}");

        boolean allRecordsInserted = true;

        for (AccountHolder accountHolder : accountHoldersTableView.getItems()) {
            // Set the input parameters for the stored procedure
            statement.setString(1, accountHolder.getName());
            String cnicNo = accountHolder.getCnicNo().replaceAll("-", "");
            statement.setBigDecimal(2, BigDecimal.valueOf(Long.parseLong(cnicNo)));
            statement.setString(3, accountHolder.getAddress());
            statement.setString(4, accountHolder.getPhone());
            statement.setBoolean(5, accountHolder.isisRetailer());

            statement.registerOutParameter(6, Types.VARCHAR);

            // Execute the stored procedure
            statement.execute();

            // Retrieve the result message
            String resultMessage = statement.getString(6);

            if (!resultMessage.equals("Account holder added successfully.")) {
                allRecordsInserted = false;
            }
        }

        // Close the database connection and statement
        db.connection.close();
        statement.close();

        if (allRecordsInserted) {
            MessageDialogs.showMessageDialog("All account holders created successfully.");

                AddNewAccountHolderController controller = new AddNewAccountHolderController();
controller.populateAccountHoldersTable();


        } else {
            MessageDialogs.showErrorMessage("Error inserting account holder(s).");
        }
    } catch (Exception e) {
        // Log the exception for debugging purposes
        log.error("Error inserting account holders(s): " + e.getMessage(), e);

        // Show a user-friendly error message
        MessageDialogs.showErrorMessage("An error occurred while inserting account holder(s).");
    }
}

现在，正如您在成功插入所有记录后所看到的那样。我想更新上一个视图的表视图，称为文件视图。但这给了我一个空指针异常。AddNewAccountHolderController.java

ERROR com.al_makkah_traders_app.controller.ImportAccountHoldersDataController - Error inserting account holders(s): Cannot invoke "com.al_makkah_traders_app.controller.AddNewAccountHolderController.populateAccountHoldersTable()" because "this.addNewAccountHolderController" is null
java.lang.NullPointerException: Cannot invoke "com.al_makkah_traders_app.controller.AddNewAccountHolderController.populateAccountHoldersTable()" because "this.addNewAccountHolderController" is null

我不知道如何防止它并更新表视图。