validations, triggered exceptions and internationalized error messages

Hello world

I want to create an application in multiple languages.

I wrote the PL/SQL functions for operations of C (R) UD (that are called through the Apex) - but without validation. All the validation code is still in the GUI/APEX, because as Apex...

  • gives me the opportunity to translate my error messages later
  • allows me to assign a validation for an input field error

But is it possible to...

  • put the validation in the PL/SQL functions?
  • always be able to establish an error for an input field?

It would be good to have 1 exception for several columns, but then, Apex do not know in what field of entry error occurred, right?

But even if I have for example a NO_POSITIVE_NUMBER_IN_COLUMN_1 and a NO_POSITIVE_NUMBER_IN_COLUMN_2 exception, it would be possible for Apex display error messages without counting as the right input fields?

If so, how is that possible? I know there is a new function Apex 4.1 error handling option, but this means that the function needs to know that will be triggered every single exception?

And where the translation take place?

Thanks in advance,

Jules

Justin

Instead of trigger an error, use apex_error.add_error to add the validation error to the error stack.

With the help of the apex.add_error shows the messages as is they where of regular postings.

PROCEDURE insert_values(p_param1 ..., p_param2 ...) IS
BEGIN
     IF p_param1 IS NULL THEN
        validation_failed := TRUE;
        apex_error.add_error(
  p_message=>'VALIDATION_NOT_NULL',
  p_display_location =>apex_error.c_inline_with_field_and_notif,
  p_page_item_name =>'P1_ITEM1_NAME'
 );
    END IF;

    IF p_param2 IS NULL THEN
        validation_failed := TRUE;
     apex_error.add_error(
  p_message=>apex_lang.message(p_message=>'VALIDATION_NOT_NULL',p0=>'Label P2_ITEM_NAME'),
  p_display_location =>apex_error.c_inline_with_field_and_notif,
  p_page_item_name =>'P1_ITEM2_NAME')
 );
    END IF;
END;

In the literature, there is the following note:

This procedure must be called before the Application Express application has completed the last validation or process. Otherwise, the error is ignored if it does not display a location of apex_error.c_on_error_page .

This means that you need to separate your actions of dml validation checks.

Note that I have show 2 different methods for translations in the example above.

For P1_ITEM1_NAME, the translation is done centralized in your handeling custom error function.

For P1_ITEM2_NAME, the translation is done directly with the validation.

Also note that postings not null is a bad example because they are defined by the parameters of page elements.

Nicolette

Tags: Database

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