Oracle Apex Report Error User-defined Exception
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Pl Sql Exception Handling Examples
DevelopmentOracle Application Express (APEX) This discussion is archived 1 2 Previous Next 20 Replies Latest reply on Aug 15, 2012 3:57 PM
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by Joe Upshaw How to Correctly Trap PL/SQL Errors for APEX Joe Upshaw Aug 14, 2012 1:48 PM This is probably a simple fix but, I have been at it for a while and can't seem
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to find the magic combination. I have a page process that calls back end PL/SQL. I have a page item that is populated by said PL/SQL procedure, P35_PROCESSING_MSG. As you know the Process allows me to specify a message for Success and another for Failure. My desire is that, if there is a back end failure, the error will display in the dialog area, using the built-in "Process Error Message" functionality. Instead, after pl sql exception handling best practices execution, the page item still has its default value and the following, ugly, error displays in the tabular report region. report error: ORA-20001: Error fetching column value: ORA-01403: no data found ORA-06510: PL/SQL: unhandled user-defined exceptionI just don't get why it displays here instead of in the usual failure area. Moreover, I don't understand why the error is "*+unhandled+* user-defined exception" when, as you will see, I have handled it. I have a page process to perfom custom MRD for a tabular form. (I don't think this is really germane to the more generic issue but, I bring it up as an explanaintion for the following code sample). I am diliberately causing a DIVIDE BY ZERO error to test the error handling form the back end. PROCEDURE PROCESS_MARGIN_CALL_DELETES( as_StatusMsg OUT VARCHAR2 ) IS lb_InnerErrorOccured BOOLEAN := FALSE; ln_DeleteTargetCnt NUMBER := 0; ln_DeleteTargetRow NUMBER := 0; BEGIN ln_DeleteTargetCnt := apex_application.g_f01.COUNT; FOR ln_DeleteTargetIndx IN 1..ln_DeleteTargetCnt LOOP ln_DeleteTargetRow := apex_application.g_f01(ln_DeleteTargetIndx); BEGIN If ( apex_application.g_f14.EXISTS(ln_DeleteTargetRow) ) Then select 1/0 into ln_DeleteTargetCnt from dual; DELETE FROM RISKDM2.INTRADAY_ECS_RSKALYST_MRGCALL WHERE RISK_MARGCALL_ID = apex_application.g_f14(ln_DeleteTargetRow); End If; EXCEPTION WHEN OTHERS THEN as_StatusMsg := as_StatusMsg || SQLERRM; lb_InnerErrorOccured := TRUE; EN
March 2012 Oracle Magazine Online 2016 2015 2014 2013 2012 2011 2010 January 2012 March 2012 May 2012 July 2012 September 2012 November 2012 As Published In March/April anonymous exception in oracle 2012 TECHNOLOGY: PL/SQL Error Management By Steven Feuerstein Part 6 error logging in oracle stored procedure in a series of articles on understanding and using PL/SQL Even if you write absolutely perfect PL/SQL programs, dbms_utility.format_error_backtrace example in oracle it is possible and even likely that something will go wrong and an error will occur when those programs are run. How your code responds to and deals with that error https://community.oracle.com/thread/2429191 often spells the difference between a successful application and one that creates all sorts of problems for users as well as developers. This article explores the world of error management in PL/SQL: the different types of exceptions you may encounter; when, why, and how exceptions are raised; how to define your own exceptions; how you can handle exceptions when they occur; http://www.oracle.com/technetwork/issue-archive/2012/12-mar/o22plsql-1518275.html and how you can report information about problems back to your users. Exception Overview There are three categories of exceptions in the world of PL/SQL: internally defined, predefined, and user-defined. An internally defined exception is one that is raised internally by an Oracle Database process; this kind of exception always has an error code but does not have a name unless it is assigned one by PL/SQL or your own code. An example of an internally defined exception is ORA-00060 (deadlock detected while waiting for resource). A predefined exception is an internally defined exception that is assigned a name by PL/SQL. Most predefined exceptions are defined in the STANDARD package (a package provided by Oracle Database that defines many common programming elements of the PL/SQL language) and are among the most commonly encountered exceptions. One example is ORA-00001, which is assigned the name DUP_VAL_ON_INDEX in PL/SQL and is raised when a unique index constraint is violated. A user-defined exception is one you have declared in the declaration section of a program unit. User-defined exceptions can be associated with an internally
comments Tweet One of the first things I noticed when making an APEX application, there was a lack of error handling. In particular, the error handling raised from an database procedure. For clarity, here a http://blog.whitehorses.nl/2010/04/15/handling-ora-errors-in-apex/ part of a screen as you will see after a unique constraint violation, the ORA-0001 error. I think the most horrible part is that this error is displayed on a new page! Errors like these must be displayed on the same page where the error occured, on top of the page, in the #NOTIFICATION_MESSAGE# area, the same way as page processing validation is displayed. Here a preview of the final in oracle result. This of course can be achieved by adding an extra page process validation. Page process validation is to be conducted before the page procesess. Major disadvantage of this solution is that all business rules which are implemented in the database, must be defined as a page process validation on each APEX page. Moreover, if we adding a business rule on the database, we must not forget to add an extra pl sql exception process validation on a ore more APEX pages. Make sure that all errors are handled by one procedure (a good habit anyway). something like this: exception when others then omp_log.error(sqlcode,sqlerrm); end ins; In this procedure, we test of this error has occurred in an APEX environment. If so, we DON'T raise this as a application error. Moreover, we remember through a package variable that an error has occurred which had not been raised. if v('APP_SESSION') is null then pv_set_unraised_error_exists := false; raise_application_error(sqlcode,sqlerrm); else -- context is APEX pv_set_unraised_error_exists := true; -- save the omp_nos.ins(sqlerrm); end if; We also save the error occurred in a temporary table. We must do that with an autonomous transaction so that the errors are actually recorded in the temporary table. We can not keep these errors in a package pl/sql table because the web, and therfore APEX is stateless and everytime we (re-)load an APEX page, we have got an new oracle session. create global temporary table omp_notifications ( session_id number not null enable ,text varchar2(4000 byte) not null enable ) on commit preserve rows ; create or replace package body omp_nos as procedure ins(p_sqlerrm in varchar2 ) is pragma autonomous_transaction; begin insert into omp_notifications (session_id ,text) values (v('APP_SESSION'),p_sqlerrm ); commit; end ins; end