Ms Sql Trigger Error Handling
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Sql Server Error Handling
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Triggers Using T-SQL Article History Error Handling within Triggers Using T-SQL Table of Contents IntroductionProblem DefinitionSolutionConclusionSee AlsoOther Languages Introduction The goal of this article is to provide a simple and easy to use error handling mechanism within triggers context.This article is completely compatible with SQL Server 2012 and 2014. Problem Definition Triggers are strange objects that have their own rules! First rule sql server try catch transaction says that triggers are part of the invoking transaction (the transaction that fired them). Yes, this is True and it means that at the beginning of the trigger, both values of @@trancount and xact_state() are "1". So, if we use COMMIT or ROLLBACK inside thetrigger, their values will change to "0" just after executing these statements. Second strange rule is that if the transaction ended in the trigger, the database raises an abortion error. An example for this rule is executing COMMIT or ROLLBACK within the trigger. Next code shows these rules: -- create test table IF OBJECT_ID('dbo.Test', 'U') IS NOT NULL DROP TABLE dbo.Test ; GO CREATE TABLE dbo.Test ( Id INT IDENTITY PRIMARY KEY, NAME NVARCHAR(128) ) ; GO -- create test trigger CREATE TRIGGER dbo.TriggerForTest ON dbo.Test AFTER INSERT AS BEGIN SET NOCOUNT ON; -- declare variables DECLARE @trancount CHAR(1) , @XACT_STATE CHAR(1) ; -- fetch and print values at the beginning of the trigger SET @trancount = @@TRANCOUNT ; SET @XACT_STATE = XACT_STATE() ; PRINT '------------------------------------------------------------------------' ; PRINT 'When trigger starts @@trancount value is (' + @trancount +
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 raise error sql Stack Overflow the company Business Learn more about hiring developers or posting ads with sql server stored procedure error handling best practices us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is error handling in sql server 2008 a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up How to handle errors in a trigger? up vote 4 down vote favorite I'm http://social.technet.microsoft.com/wiki/contents/articles/22177.error-handling-within-triggers-using-t-sql.aspx writing some SQL code that needs to be executed when rows are inserted in a database table, so I'm using an AFTER INSERT trigger; the code is quite complex, thus there could still be some bugs around. I've discovered that, if an error happens when executing a trigger, SQL Server aborts the batch and/or the whole transaction. This is not acceptable for me, because it causes problems to the main http://stackoverflow.com/questions/10462800/how-to-handle-errors-in-a-trigger application that uses the database; I also don't have the source code for that application, so I can't perform proper debugging on it. I absolutely need all database actions to succeed, even if my trigger fails. How can I code my trigger so that, should an error happen, SQL Server will not abort the INSERT action? Additionally, how can I perform proper error handling so that I can actually know the trigger has failed? Sending an email with the error data would be ok for me (the trigger's main purpose is actually sending emails), but how do I detect an error condition in a trigger and react to it? Edit: Thanks for the tips about optimizing performance by using something else than a trigger, but this code is not "complex" in the sense that it's long-running or performance intensive; it simply builds and sends a mail message, but in order to do so, it must retrieve data from various linked tables, and since I am reverse-engineering this application, I don't have the database schema available and am still trying to find my way around it; this is why conversion errors or unexpected/null values can still creep up, crashing the trigger execution. Also, as stated above, I absolutely can't per
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 http://stackoverflow.com/questions/884334/tsql-try-catch-transaction-in-trigger the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up TSQL: Try-Catch Transaction in Trigger up vote 11 down vote favorite 5 I am trying to put sql server a try-catch statement inside a trigger using Microsoft Server 2005. BEGIN TRANSACTION BEGIN TRY --Some More SQL COMMIT TRANSACTION END TRY BEGIN CATCH IF (XACT_STATE()) = -1 BEGIN ROLLBACK TRANSACTION; END; END CATCH The problem is that I don't want the trigger to fail if something is caught by the try-catch block. At the moment, I am getting the error "The transaction ended in the trigger. The batch has been aborted." if in sql server the transaction fails. How can I get the trigger to fail gracefully? Additionally, if I remove the transaction, I get the error "Transaction doomed in trigger. Batch has been aborted.". BEGIN TRY --Some More SQL END TRY BEGIN CATCH return END CATCH Is there any way around this? sql-server tsql triggers share|improve this question edited May 20 '09 at 4:28 gbn 268k40379482 asked May 19 '09 at 18:28 Eldila 5,593184458 I am trying to update a legacy database whenever anything is inserted into a table. The problem is that I don't want the insert to fail if the trigger fails. The legacy database is not the most reliable system. –Eldila May 19 '09 at 22:12 12 I'm going to start using the word "doomed" in more of my error messages. –AaronLS Dec 22 '10 at 19:50 add a comment| 8 Answers 8 active oldest votes up vote 8 down vote In my experience any error caught in a try catch in a trigger will rollback the entire transaction; you may be able to use a save transaction. I think you need to look at whats happening in "Some more sql" and determine if you can write case / if statements around it to stop the error. What you may