Error Handling Teradata Procedures
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Error Handling In Teradata Stored Procedure
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Exception Handling In Teradata Stored Procedures
We Love Presto DanGraham Hadoop Transitioning from SQL Assistant to Studio Express fgrimmer Tools Teradata Query Grid and Machine Learning in Hadoop watzke Extensibility Print All Blogs mtmoura's Blog Let's talk about Stored Procedures Blog error handling in teradata bteq entry by mtmoura on 14 Apr 2010 28 comments Tags: stored procedureextensibility In my opinion stored procedures can be used to enforce standards for commonly used processes and to avoid the same code to be copied out into multiple scripts/programs creating a maintenance nightmare. But let's list some of the pro's & con's associated with stored procedures. A good way to enforce standards for commonly used processes to avoid same exception handling in teradata code proliferation. Provide code flexibility. Code resides inside the Teradata environment already compiled avoiding network traffic. Nested stored procedures allowed. UDF utilization allowed. No debug tool available. No automatic error handling. There are a lot of developers using stored procedures nowadays and it's important to talk about the following topics. Standard error handling How to handle exceptions after nested stored procedures calls? How to use dynamic embedded SQL inside a stored procedure? Standard Error Handling Let's list some important considerations about stored procedure error handling. There is no automatic exception handler inside a stored procedure unless is define. The return code of a stored procedure call is always 0 for a success or an exception execution unless the exception is an access rights error. An outside exception handler process needs to be defined after a stored procedure call to handle an exception. A stored procedure error handling should have at least 3 basic exception handlers as follows. EXIT HANDLER FOR SQLEXCEPTION CONTINUE HANDLER FOR SQLWARNING CONTINUE OR EXIT HANDLER FOR SQLSTATE = '02000' Exit Handler for SQLEXCEPTION This exception handler covers any SQLSTATE that is different from '00000‘ (Successful), and from '01000‘ (Warning), and from '02000‘ (Data not found). The following example shows how to define an exit handler for SQ
QuizContactContactsGuest PostingCorrections or Errors? Click hereTopic Request CloseHome » Posts » Stored Procedures » Teradata Stored Procedures - Error HandlingTeradata Stored Procedures - Error HandlingJanuary 27, 2015 by Roland Wenzlofsky Leave a CommentLast updated:Saturday, August 22,
Declare Exit Handler For Sqlexception In Teradata
2015 Our Reader Score [Total: 8 Average: 3.8/5] Share the joy teradata stored procedure tutorial OverviewError handling in Teradata Stored Procedures is condition based, having the same functionality offered by modern programing languages (C++,
Teradata Error Handling
Java etc.).Without the availability of condition based error handling one would need to implement and invoke code for each type of error and at each code location where the error http://developer.teradata.com/blog/mtmoura/2010/04/lets-talk-about-stored-procedures could occur.Not only is this a huge effort from a development point of view, but some error handling can easily be forgotten about.Below you can see one example of such an programmatic approach, handling division by zero errors.REPLACE PROCEDURE DIVISION_BY_ZERO (IN n INTEGER) BEGIN DECLARE x INTEGER DEFAULT 10; -- Error Handling programmatically CASE WHEN n = 0 THEN SET x http://www.dwhpro.com/teradata-stored-procedures-error-handling/ = 0; ELSE SET x = (x/ n); END CASE; END;CALL DIVISION_BY_ZERO(0);When using error handlers, the handler code for a certain error is defined once within the handler and executed automatically each time the error condition is raised.Below you see the division by zero problem solved with an error handler. The error code ‘22012’ is returned in case of a division by zero error:REPLACE PROCEDURE DIVISION_BY_ZERO (IN n INTEGER) BEGIN DECLARE x INTEGER DEFAULT 10; DECLARE EXIT HANDLER FOR SQLSTATE ‘22012' SET x = 0; -- Error HandlerSET x = (x/n); END;CALL DIVISION_BY_ZERO(0);It is possible to define error handlers which are responsible for all errors or warnings (generic handlers), they will be executed if an error/warning is not already covered by a specific error handler.This means, the developer does not need to know in advance all possible kind of errors and warning.Generic handler are usually used to do the cleanup before exiting a stored procedure. See below two examples for generic exception and warning handlers:DECLARE CONTINUE HANDLER FOR SQLEXCEPTION SET x =0; DECLARE CONTINUE HANDLER FOR SQLWARNING SET x =0;Each stored pro
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting http://stackoverflow.com/questions/24269157/teradata-stored-procedure-how-to-get-error-message-text-from-error-handler ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join https://www.wisdomjobs.com/e-university/teradata-tutorial-212/stored-procedures-1012/exception-handling-6250.html the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Teradata Stored Procedure - How to get error message text from error handler up vote 1 down vote favorite is there a way how to beside of SQLCODE and SQLSTATE return the actual error message text? Of course error handling I can look for the error message in DBC.ERRORMSGS by SQLCODE but clearly I am not able to resolve the error-related object names from there. Fe. all I can get from DBC.ERRORMSGS is 'Object '%VSTR' does not exist.' Is there a way how to resolve the object name so I would get something like 'Object DATABASEXOXO.TABLEXOXO does not exist.'? Thanks stored-procedures error-handling teradata share|improve this question asked Jun 17 '14 at 16:40 Jiri Hubacek 1277 add a comment| 2 Answers 2 active handling in teradata oldest votes up vote 2 down vote accepted Teradata supports Standard SQL's error handling, i.e there's a "diagnostic area" and one of it's fields is MESSAGE_TEXT which holds the error text. It's usually accessed in condition handler using the GET DIAGNOSTIC statement like this: GET DIAGNOSTICS EXCEPTION 1 myval = MESSAGE_TEXT; Check the Stored Procedure manual for further details. share|improve this answer answered Jun 17 '14 at 19:00 dnoeth 29.8k2926 Thank you very much. Your answer pointed me to the right direction. Have a nice day! –Jiri Hubacek Jun 18 '14 at 9:05 add a comment| up vote 0 down vote Unfortunately MESSAGE_TEXT is limited to 128 characters. With newer versions of Teradata a single column/table name can be 128 characters. So from the diagnostics you cannot always get the full error message out. The only other way I know is through dbc.qrylog.ErrorText. But the qrylog is not always up to date and must be turned on. share|improve this answer answered Aug 20 '15 at 9:42 tjr 11 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign up using Facebook Sign up using Email and Password Post as a guest Name Email Post as a guest Name Email discard By posting your answer, you agree to the privacy policy and terms of service. Not the answer you're looking for? Browse other questions tagged stored-procedures error-handling teradata or ask your own question. asked
of Teradata Course introduction Test Your Caliber Interview Questions Pragnya Meter Exam List of Topics Teradata Parallel Architecture Fundamental SQL Using SELECT On-line HELP and SHOW Commands Data Conversions Aggregation Subquery Processing Join Processing Date and Time Processing Character String Processing OLAP Functions SET Operators Data Manipulation Data Interrogation View Processing Macro Processing Transaction Processing Reporting Totals and Subtotals Data Definition Language Temporary Tables Trigger Processing Stored Procedures Teradata Stored Procedures CREATE PROCEDURE Stored Procedural Language (SPL) Statements Establishing Variables and Data Values Additional SPL Statements Exception Handling DML Statements Using Column and Alias Names Comments and Stored Procedures On-line HELP for Stored Procedures REPLACE PROCEDURE DROP PROCEDURE RENAME PROCEDURE SHOW PROCEDURE Other New V2R4.1 Features Considerations When Using Stored Procedures Compiling a Procedure Related Jobs Senior SSAS Developer - OLAP/Teradata/SQL Informatica Developer - Teradata Informatica Developer - Teradata ETL -informatica Informatica Developer - Linux/Unix Scripting Opening for informatica Developer with Banking Domain @ Chennai &Hyd ETL Developer / Informatica Developer in Bangalore and Hdyerabad Informatica- ETL Technology Professional Teradata System DBA Oracle DBA with Unix Exp Teradata DBA Profile - Bangalore/hyderabad (tcs) Location. UnitedHealth Group - Project Manager - Java/Oracle/Unix Informatica Powercenter Expert - SQL / Oracle Talent Sr.analyst Informatica Developers Sr Software Developer(oracle) For Worlds #1 Crm/direct Mktg. Company Big Data Architect - Informatica/etl Informatica Admin Informatica Bigdata_digital_technical Lead_blr Software Dev Sr. Advisor - Teradata Database Admin Teradata Stored ProceduresException Handling At times, things may happen within stored procedures that are out of the ordinary. The status variables can be a major help in determining what happened. However, at times, the same error handling logic might be needed multiple times within the same procedure. When this is the case, a Handler routine may be written to "handle" the condition. This is an alternative to coding the same IF statements multiple times.DECLARE HANDLER StatementThe DECLARE is also used to establish a Handler as well as a variable. A Handler is a section of logic that executes automatically based on error conditions that may occur during the execution of a stored procedure.This is important because the procedure is executing without interaction from the user. It does not return until it is finis