Error Handling In Triggers Sql Server 2008
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Triggers In Sql Server 2008 W3schools
within Triggers Using T-SQL Error Handling within 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 triggers in sql server 2008 with examples are strange objects that have their own rules! First rule 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 = @@TRANCO
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How to handle errors in a trigger? up vote 4 down vote favorite I'm 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 http://social.technet.microsoft.com/wiki/contents/articles/22177.error-handling-within-triggers-using-t-sql.aspx 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 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 http://stackoverflow.com/questions/10462800/how-to-handle-errors-in-a-trigger 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 perform debugging on the application itself, nor modify it to do what I need in the application layer; the only way to react to an application event is by firing a database trigger when the application writes to the DB that something has just heppened. sql sql-server error-handling triggers sql-server-2008-r2 share|improve this question edited May 6 '12 at 21:05 asked May 5 '12 at 14:30 Massimo 9621227 2 You might use TRY ... CATCH inside trigger to ignore, but log errors. –Ni
here for a quick overview of the site Help Center Detailed answers to any questions you might have http://stackoverflow.com/questions/9971602/ignoring-errors-in-trigger 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 ads with us http://www.sqlteam.com/forums/topic.asp?TOPIC_ID=64482 Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like sql server you, helping each other. Join them; it only takes a minute: Sign up Ignoring errors in Trigger up vote 4 down vote favorite I have a stored procedure which is called inside a trigger on Insert/Update/Delete. The problem is that there is a certain code block inside this SP which is not critical. Hence I want sql server 2008 to ignore any erros arising from this code block. I inserted this code block inside a TRY CATCH block. But to my surprise I got the following error: The current transaction cannot be committed and cannot support operations that write to the log file. Roll back the transaction. Then I tried using SAVE & ROLLBACK TRANSACTION along with TRY CATCH, that too failed with the following error: The current transaction cannot be committed and cannot be rolled back to a savepoint. Roll back the entire transaction. My server version is: Microsoft SQL Server 2008 (SP2) - 10.0.4279.0 (X64) Sample DDL: IF OBJECT_ID('TestTrigger') IS NOT NULL DROP TRIGGER TestTrigger GO IF OBJECT_ID('TestProcedure') IS NOT NULL DROP PROCEDURE TestProcedure GO IF OBJECT_ID('TestTable') IS NOT NULL DROP TABLE TestTable GO CREATE TABLE TestTable (Data VARCHAR(20)) GO CREATE PROC TestProcedure AS BEGIN SAVE TRANSACTION Fallback BEGIN TRY DECLARE @a INT = 1/0 END TRY BEGIN CATCH ROLLBACK TRANSACTION Fallback END CATCH END GO CREATE TRIGGER TestTrigger ON TestTable FOR INSERT, UPDATE, DELET
SQL Server experts to answer whatever question you can come up with. Our new SQL Server Forums are live! Come on over! We've restricted the ability to create new threads on these forums. SQL Server Forums Profile | ActiveTopics | Members | Search | ForumFAQ Register Now and get your question answered! Username: Password: Save Password Forgot your Password? All Forums SQL Server 2000 Forums SQL Server Development (2000) Errors in Triggers - catch them if you can Reply to Topic Printer Friendly Author Topic Ogreite Starting Member 5 Posts Posted-04/11/2006: 05:53:12 Hi all, I have a question about recovering from errors in a trigger, I hope you can help me.I have a situation where I need to record an audit for every modification (delete, update and insert) on certain tables. A stored procedure called from triggers seem to be ideal, but the catch is I dont want to interfere whatsoever with the original data modifications.The problem arises when an error occurs in my trigger. If the trigger crashes, I loose the original data modifications! I dont want that to happen...if the trigger (or the SP that it calls) crashes, then too bad. I can live with loosing the audit trail, but I dont want it to affect anything else.I havent been able to successfully try and catch the errors without the original data changes (that starts the trigger) getting lost or rolled back. I use the AFTER trigger type, and apparantly this is only fired after the triggering SQL statement is executed successfully. So basically at this point I want this stuff to get commited before I attempt auditting it, if possible, but I have read on the net that all errors terminate a trigger batch and roll back the transaction on the spot. I believe this will be tricky to do because I have also read that "each INSERT, UPDATE and DELETE statement is its own transaction in SQL Server, and the trigger is part of that transaction".This is my basic layout of my tigger and the SP that it calls:CREATE TRIGGER [TestTrigger] ON [dbo].[someTable] AFTER insert, update, delete AS BEGIN SET NOCOUNT ON; BEGIN TRY EXEC [dbo].[TestProcedure] 'someValue' END TRY BEGIN CATCH raiserror('Error in Trigger!', 16, -1) END CATCH; END; CREATE PROCEDURE [dbo].[TestProcedure] ( @someValue varchar(50) ) AS BEGIN BEGIN TRY END TRY BEGIN CATCH raiserror('Error in TestProcedure!', 16, -1) END CATCH; END;Does anyone have any ideas how I can solve this? Edited by - Ogreite on 04/11/2006 05:56:17 rmason Starting Member 12 Posts Posted-04