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Good SQL error handling in Strored Procedure

, 7 May 2009 CPOL
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Body: When writing SQL procedures, it is really important to handle errors cautiously. Having that in mind will probably save your efforts, time and money. I have been working with MS-SQL 2000 and MS-SQL 2005 (I have not got the opportunity to work with MS-SQL 2008 yet) for many years now and I w
Body:

When writing SQL procedures, it is really important to handle errors cautiously. Having that in mind will probably save your efforts, time and money. I have been working with MS-SQL 2000 and MS-SQL 2005 (I have not got the opportunity to work with MS-SQL 2008 yet) for many years now and I want to share with you how I handle errors in T-SQL Stored Procedure. This code has been working for many years now without a hitch.

N.B.: As antoher "best pratice", I suggest using only ONE level of TRY ... CATCH and only ONE level of TRANSACTION encapsulation, as doing otherwise may not be 100% sure.

    
    BEGIN TRANSACTION;
    BEGIN TRY
    
    -- Code in transaction go here
    
    COMMIT TRANSACTION;
		
    END TRY BEGIN CATCH
        
        -- Rollback on error
        ROLLBACK TRANSACTION;

        -- Raise the error with the appropriate message and error severity
        DECLARE @ErrMsg nvarchar(4000), @ErrSeverity int;
        SELECT @ErrMsg = ERROR_MESSAGE(), @ErrSeverity = ERROR_SEVERITY();
        RAISERROR(@ErrMsg, @ErrSeverity, 1);

    END CATCH;

In conclusion, I will just mention that I have been using this code with .NET 2.0 and .NET 3.5 and it works like a charm. The .NET TDS parser throws back a SQLException which is ideal to work with.

Original post url : http://sp.nitriques.com/sites/blog/Lists/Posts/Post.aspx?ID=15

Category: CodeProject
Published: 5/7/2009 11:22 PM

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Nicolas Brassard
President Solutions Nitriques inc.
Canada Canada
I am the general director of Nitriques Solutions inc. We build software and web solutions for enterprises using .NET 2.0 and 3.5, MS-SQL Server 2005 running on various Server 2003.
 
We offer a variety of products, from simple corporate web site with CMS to complete integration of intranets.
 
I have been working with asp et MS-SQL since 2002. I am particularly interested in web development 2.0, ajax, css, xhtml, asp.net, jQuery, Open Social and other web technologies.
 
In my spare time (when this concept exist in my life), i like to snowboard, skydive or free fall in wind tunnels and learning cool new stuff about anything.
 
Please feel free to contact me. http://www.nitriques.com

Comments and Discussions

 
GeneralMy vote of 1 PinmemberKinStephen8-May-09 7:39 
AnswerRe: My vote of 1 PinmemberNicolas Brassard9-May-09 16:45 

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