Get SQL Error from .Net
I am sing SQL Procedures for Insert and Update. In the SQL Procedure i used try catch. How can i get the SQL exception from .net.
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ask123
11/10/2008 9:06:47 PM
asp.net.sql-datasource
29906 articles. 
0 followers.
3 Replies
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Try
{
//Execute your sql here.
}
Catch (SqlException and sqlEx)
{
//Do Something
}
Pushing out shapes, to a popular beat combo.
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therubble
11/10/2008 10:26:40 PM
If you want to cause an error in the calling application you need to raise an error in the Catch Block. If you just want to return the error information as a resultset, execute a select statement. There are several variables, only available in the Catch Block, that you can use to return error information.
Example from MSDN
BEGIN CATCH
SELECT
ERROR_NUMBER() AS ErrorNumber,
ERROR_SEVERITY() AS ErrorSeverity,
ERROR_STATE() AS ErrorState,
ERROR_PROCEDURE() AS ErrorProcedure,
ERROR_LINE() AS ErrorLine,
ERROR_MESSAGE() AS ErrorMessage;
END CATCH;More info from MSDN
When the code in the CATCH block finishes, control passes to the statement immediately after the END CATCH statement. Errors trapped by a CATCH block are not returned to the calling application. If any part of the error information must be returned to the application, the code in the CATCH block must do so by using mechanisms such as SELECT result sets or the RAISERROR and PRINT statements. For more information about how to use RAISERROR with TRY…CATCH, see Using TRY...CATCH in Transact-SQL.
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brucevde
11/10/2008 10:31:52 PM
Here are some samples in my SP code to raise errors and return then to ASP.NET application
SET
NOCOUNT ON;IF EXISTS (SELECT * FROM dbo.People WHERE FirstName = @FirstName AND LastName = @LastName AND DOB=@DOB AND SiteID = (select SiteID from People where PersonID = @PersonID) and PersonID <> @PersonID)BEGIN RAISERROR (N'There is another user %s %s with the same name.',16
, -- Severity,1
, -- State,@FirstName
, @LastName)RETURN -1 ENDAnd end of this procedure (I have try/catch block in it)
COMMIT TRANSACTION END TRYBEGIN CATCH DECLARE @ErrorSeverity int, @ErrorNumber int, @ErrorMessage nvarchar(4000), @ErrorState int,@ErrorLine
int, @ErrorProc nvarchar(200) -- Grab error information from SQL functions SET @ErrorSeverity = ERROR_SEVERITY() SET @ErrorNumber = ERROR_NUMBER() SET @ErrorMessage = ERROR_MESSAGE() SET @ErrorState = ERROR_STATE() SET @ErrorLine = ERROR_LINE() SET @ErrorProc = ERROR_PROCEDURE()SET @ErrorMessage = 'Problem updating person''s information.' + CHAR(13) + 'SQL Server Error Message is: ' + CAST(@ErrorNumber AS VARCHAR(10)) +' in procedure: ' + @ErrorProc + ' Line: ' + CAST(@ErrorLine AS VARCHAR(10)) +' Error text: ' + @ErrorMessage -- Not all errors generate an error state, to set to 1 if it's zeroIF @ErrorState = 0SET @ErrorState = 1-- If the error renders the transaction as uncommittable or we have open transactions, we may want to rollbackIF @@TRANCOUNT > 0 BEGIN --print 'Rollback transaction' ROLLBACK TRANSACTION ENDRAISERROR (@ErrorMessage , @ErrorSeverity, @ErrorState, @ErrorNumber) END CATCH RETURN @@ERROR
END
GO
This code is written based on the article by Kevin Goff http://www.setfocus.com/TechnicalArticles/sql-server-2005-tsql-2.aspx
Beware of bugs in the above code; I have only proved it correct, not tried it.
(Donald Knuth)
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Naom
11/11/2008 1:56:33 AM
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