As400 Embedded Sql Error Handling
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Error Handling in Embedded SQL Tips & Techniques - SQL Written by Guest.Visitor Thursday, 11 August 2005 19:00 View Comments Part of good programming practice is error handling: Was the record found? Does the field contain proper data? Is it possible to add a record?You know the sort.The same is true with embedded SQL. Let's review two simple error-handling techniques for your embedded SQL statements. WHENEVER The simplest way to monitor
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for SQL errors is to use the SQL WHENEVER statement: WHENEVERtypeaction Type indicates the type of status encountered by the SQL statement. It is one of the following: NOT FOUND--True when the SQL statement finds no data (for example, FETCHing past the end of a result table or no records found for delete) SQLWARNING--True when the SQL statement executes successfully, but with warnings SQLERROR--True when the SQL statement failsAction tells SQL what to do in case of one of the errors: CONTINUE--Continue with the next statement in your program GOTO (or GO TO) label--Go to a point in the program indicated by "label." In RPG, that would be a label with a TAG; in COBOL, a paragraph or section name.A WHENEVER statement affects all SQL statements that follow in your program's listing (regardless of program logic), up to a subsequent WHENEVER statement. For any of the three types you do not code a WHENEVER for, SQL assumes an implicit WHENEVER, using an action of CONTINUE. SQLCODE and SQLSTATE I don't like WHENEVER because it's too general and it uses outdated and vilified programming constructs--GOTO and TAG. Instead of WHENEVER, I usually use SQLCODE or SQLSTATE.SQLCODE and SQLSTATE are two fields that you define in your program. SQL sets these fields after every SQL state
"Holden Tommy"
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WHENEVER c/exec sql C+ WHENEVER SQLERROR CONTINUE c/end-exec Which executes the next line of code after the SQL statement that sqlcod in sqlrpgle checks for the SQLSTT , etc. Thanks, Tommy Holden -----Original Message----- From: rpg400-l-bounces+tommy.holden=hcahealthcare.com@xxxxxxxxxxxx [mailto:rpg400-l-bounces+tommy.holden=hcahealthcare.com@xxxxxxxxxxxx] On Behalf Of Knezevic, Mihael Sent: Monday, December 19, 2005 8:18 AM To: RPG programming on the AS400 / http://www.mcpressonline.com/tips-&-techniques/sql/techtip-simple-error-handling-in-embedded-sql.html iSeries Subject: RE: embedded sql error handling thanx for the quick answer. > -----Original Message----- > From: rpg400-l-bounces@xxxxxxxxxxxx > [mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of HauserSSS > Sent: Monday, December 19, 2005 3:12 PM > To: RPG programming on the AS400 / iSeries > Subject: AW: embedded sql error handling > > Hi, > > instead of using WHENEVER SQLERROR, you can check SQLCOD or > SQLSTT directly. http://archive.midrange.com/rpg400-l/200512/msg00455.html > If an error occured the SQLCOD is less than *Zeros and the > first two digits > are not '01' and not '00' and not '02'. > > C/EXEC SQL .... > C/END-EXEC > /Free > > If SQLCOD < *Zeros; //Error occured > //Do whatever you want > EndIf; > > SQLSTT should be prefered because this is SQL standard. > > Birgitta > > > -----Ursprüngliche Nachricht----- > Von: rpg400-l-bounces@xxxxxxxxxxxx > [mailto:rpg400-l-bounces@xxxxxxxxxxxx]Im Auftrag von Knezevic, Mihael > Gesendet: Montag, 19. Dezember 2005 14:51 > An: RPG programming on the AS400 / iSeries > Betreff: embedded sql error handling > > > hi, > > i've started reading myself into the topic embedded sql and > i'm wondering > how i'am going to catch the errors which might occur at > runtime. i have seen > some constructs like: > > C/EXEC SQL WHENEVER SQLERROR GOTO ... > C/END-EXEC > > but these things only helps in a non-/free environment with > the tag keyword. > how do i code it without the tag keyword in a /free block. > and how do i know > which error occured (error code and description).
handling 17 replies Latest Post - 2014-05-14T20:37:14Z by Damery Display:ConversationsBy Date 1-18 of 18 Previous Next Damery 270002XNE4 71 Posts Pinned topic SQLRPGLE exception handling 2013-11-21T13:21:53Z | Tags: Answered question This question has been answered. Unanswered question This question has not been answered https://www.ibm.com/developerworks/community/forums/html/topic?id=d2c49b79-5a01-46f7-9a11-b9de0f2b0e02 yet. Is there a Best Practice for handling SQL errors/exceptions? Is there a way to http://iprodeveloper.com/database/foolproof-guide-embedded-sql-error-handling catch those in a monitor group? Or is the only way within the SQL status code manual handling? It appears that right after running your SQL statement you need to check the SQL Status code and then create a manual error message and pass that back up the process flow till you reach a program to handle it. sql error Is this about it? Log in to reply. scott_klement 2700007QFX 262 Posts ACCEPTED ANSWER Re: SQLRPGLE exception handling 2013-11-22T05:57:44Z Embedded SQL sets the SQLSTATE and SQLCODE variables with the status of each statement. It does not send exceptions to your program, so if you do not explicitly check for an error, the program will continue running after an error occurs. The code to check for an error depends somewhat on the statement you ran sql error handling and what your program plans to do with it, but typically it looks something like this: if %subst(sqlstt:1:2)<>'00' and %subst(sqlstt:1:2)<>'01'; // an error occurred. endif; The SQLSTATE variable (SQLSTT for short) contains a 5A value. The first two characters identify the type of status, and the last 3 characters identify a specific error code. An SQLSTATE value that begins with 00 means "success", and 01 means "successful, but with a warning". So if the statement finished with these, it has run successfully. Anything else indicates a failure of some sort. One easy way to deal with this is to write a subprocedure that accepts the SQLSTATE as a parameter. I used to do this at my previous employer, unfortunately, I no longer have access to the code. If I recall correctly, it looked like this (this is off the top of my head, and may be wrong... but should give you the idea, at least.) H NOMAIN *+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ * CheckSQL(): Check for an SQL error * * peSqlStt = (input) SQL State to check * peMsg = (input) Message to log when error occurs. * * Returns *ON if Error or End-of File * * Sends warning messages as *DIAG to job log, * sends error messages as *ESCAPE to caller. *+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ P CheckSQL B export D PI 1n D peSq
Mobile App Dev DB/SQL Systems Mgmt Buyer's Guide Power Packs Code TrainingOnline Training Digital Magazine Archives MVP Library MVP Lite Library Advertisement Home > Database/SQL > Database > Foolproof Guide to Embedded SQL Error Handling Foolproof Guide to Embedded SQL Error Handling May 1, 2007 Paul Conte | System iNEWS Magazine EMAIL Tweet Comments 2 As SQL becomes more widely used in production applications, robust error checking and handling of embedded SQL statements becomes increasingly important. When you code embedded SQL statements in a high-level language, such as ILE RPG or ILE Cobol, you should always check every executable SQL statement for successful completion and then handle any unexpected conditions appropriately. This article provides some foolproof advice, techniques, and coding patterns that make the task a ... REGISTER NOW TO ACCESS THIS ARTICLE All registered users get access to premium content on iPro Developer for free.
Register Now Already registered? Log In here. Print reprints Favorite EMAIL Tweet Discuss this Article 2 dougin@bridwell.net on May 14, 2013 All links to figures other than figure 1 are not accessible. Get a page not found error. Log In or Register to post comments rachel.koon@pen... on May 14, 2013 These links have been fixed. Thanks for bringing this to our attention! Log In or Register to post comments Please Log In or Register to post comments. Related ArticlesFoolproof Guide to Embedded SQL Error Handling Foolproof Guide to Embedded SQL Error Handling Handling Errors in RPG Embedded SQL Jump Start 2 Embedding Dynamic SQL in an RPG IV Program Advertisement iPro Forums Get answers to questions, share tips, and engage with theiPro Community in our Forums. From the Blogs Mar 27, 2014 blog Application Modernization Redbook Unleashed The Application Modernization Redbook draft version has been released! Tim Rowe has the details....More Mar 19, 2014 blog Free-Form RPG Transformation, Part 2 Tim Rowe continues his series on ISV tools for free-form RPG with a look at Linoma Software's free-format transformation tool, RPG Toolbox....More Showing 1-2 of 1279 itemsprev 1 2 3 … 640 next Advertisement Advertisement Advertisement Home RPG Programming PHP Web & Mobile Development App Development Data