Patrick Wolf Error Handling
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Previous Next → APEX 4.1 - Error Handling Improvements - Part 1 Posted on May 9, 2011 by Patrick Wolf The Early Adopter release of Oracle APEX 4.1 contains five new enhancements in the Error Handling area. In the next few blog postings I apex_application.g_print_success_message error will highlight those. This first article features "Error Handling Function" A long requested feature and something exception handling in oracle apex I also always wanted to have before I joined the APEX development team. Guess what, that's why I always wanted to implement that when I oracle apex 5 error handling joined the team and in 4.1 I finally had the opportunity to do it. So hopefully you find it useful what's available now. What can you do and when would you use this new error handling hook? This feature can be
Oracle Apex Error Handling Example
used if a developer wants to have full control what is happening if an error occurs in an APEX application. This includes errors raised by validation, process, … and all errors raised by the Application Express engine itself. It can be used to just log the error, but it can also be used to modify the error message text, define where it should be displayed (Inline with Field and in Notification, Inline with Field, Inline in Notification and On Error Page) and salesforce apex error handling it's also possible to specify which page item/tabular form column should be highlighted. We have written a number of helper function to make your life as easy as possible. An example would be to extract constraint names out of error messages (working with all languages) so that you can use them for a lookup in your own error message table. Or a helper procedure to automatically detect the affected page item if a constraint error occurred. But first let's summaries again why to use that feature. Use cases why someone would you use this feature To log all errors which occur in an APEX application Map errors raised by the Oracle Database (like "Unique constraint XYZ violated) to friendlier error messages understandable by the business user To display all errors "Inline in Notification" without having to change the new "Error message display location" for all processes of an existing application Increase application security by showing a generic error message for internal APEX errors instead of the original message which most of the time includes the ORA error message which might expose sensitive information about the structure of the application/database. Such a generic error message could be "An unexpected internal application error has occurred. Please get in contact with XYZ and provide reference# 123 for further investigation." Because it's a cool feature 😉 So how would you use this feature? You have to create a function in a package or a stored function in
in APEX4.1 Date: May 18, 2012Author: Nick Buytaert 23 Comments The most valuable new feature in APEX 4.1 is definitely the possibility to implement oracle apex notification message an error handling function. It basically allows you to execute a PL/SQL function every time an error occurs in your application. An error handling function accepts one parameter of type apex_error.t_error which holds all relevant error information. The apex_error.t_error_result type is used as the return type and contains information on how the error message should be presented to the end user. http://www.inside-oracle-apex.com/apex-4-1-error-handling-improvements-part-1/ I won't get into too much detail on how an error handling function should look like since all of this is well-documented. Then there is also Patrick Wolf who wrote a great article regarding the why and how of error handling. locating the error handling function in application properties A good starting point to build your own function is the template code which https://apexplained.wordpress.com/2012/05/18/beginning-error-handling-in-apex-4-1/ can be found here. The purpose of this article is to provide and explain a hands-on example of an error handling function that allows you to take advantage of following possibilities: Error logging Define an error message its display location Detect severe internal exceptions and modify the error message Map a constraint violation to a specific error message E-mail notification when an unexpected error occurs Getting started The error handling function is being executed for all sorts of errors. I make a distinction between expected and unexpected errors. The occurrence of an unexpected error is vital information for a developer since it reveals serious shortcomings of the application logic or validations. I opted to only log this kind of errors, but nothing stops you from logging expected errors as well. You first need a table to hold all logged errors. My ERROR_LOG table contains all the information on the encountered error (retrieved from the incoming parameter of type t_error), plus some general information derived from substitution strings, and a time stamp. the ERROR_LOG table P.S. I included the ID of the applicatio
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