Tips to debug / find the source of the problem?

Hello

I have a problem with an ApEx application that is a little large and complex.
Anyone has any suggestions or tips to find where a bug in the program data that happens?

My version of the ApEx is 3.2.1.00.12

Tips for debugging / tracing are greatly appreciated!

Details of the problem:
Somewhere, the values in the ApEx APEX_APPLICATION collection. G_F33 get set of duplicates.
In a process Page:

FOR i in 1..APEX_APPLICATION.G_F33.COUNT LOOP
-- This code is running too many times
END LOOP;

In very general terms, here under the name of debugging tips:

1. (this is a sine qua non btw - stop what you are doing and do this first): see the documentation of the APEX for a debugging guide. There are references to the "window of Session' and 'Debug Mode' - making use of these views can give you a lot of detailed information on the current status of your application and what happens during the loading of the page.

2 make use of the

wwv_flow.debug

function of output messages, which can be seen in the denunciation of "Debug" (see above) - it's kind of equivalent to the use of the former

 DBMS_OUTPUT

in the world of PL/SQL.

3. in the more complex application logic/code, try save information using a kind of framework for logging - either something about measurement or using a solution "on shelf".

I would say that under option 3, especially for capturing information about errors/exceptions. I used to use my own custom logging package/table combination, but I moved to the use of APEX Logger of Tyler Muth *, which helped improve the debugging/alpha test of my applications without end.

It is very easy to install, simply require some relatively minor privileges database and executing a single SQL script (of course if you do not have the relevant privileges, talk with your local administrator own - bring beer/chocolate/candy / [bribe choices] to facilitate).

While writing the application code, you can insert calls to the relevant Recorder function in areas requiring an observation. These entries can then be queried via built-in views. In addition, you can capture complete session Apex information with a simple function call, which allows you to examine the State of the whole application at a point of run (particularly useful for situations where there is a reference to several pages or elements of application).

Once you have finished your debugging phase, you also have the option to change the logging levels so that (for example when you move to a production environment) you can turn off logging completely or leave it to report errors only.

(*) I have no affiliation with Tyler Muth or recorder of APEX is said by the way

Tags: Database

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