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T SQL Error Capturing


T SQL Error Capturing

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mymail.default
mymail.default
Say Hey Kid
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Hello,

A quick question trying to handle an error when using sp_attach_db. Here it is in the script below with a non-existent path for the db files:

-- Start
BEGIN TRY
DECLARE @retval int;

EXEC @retval = sp_attach_db @dbname = N'myDB',
@filename1 = N'W:\myDB.mdf',
@filename2 = N'W:\myDB.ldf',
@filename3 = N'W:\myDB.ndf'

END TRY

BEGIN CATCH
print 'Here'
DECLARE @errmsg varchar(2000);
SELECT @errmsg = ERROR_MESSAGE();

END CATCH
--End

The above script does not go to the Catch block at all.

However if I were to run just this:

DECLARE @retval int;


EXEC @retval = sp_attach_db @dbname = N'myDB',
@filename1 = N'W:\myDB.mdf',
@filename2 = N'W:\myDB.ldf',
@filename3 = N'W:\myDB.ndf'

I get an error:

Msg 5133, Level 16, State 1, Line 1
Directory lookup for the file "W:\myDB.mdf" failed with the operating system error 3(The system cannot find the path specified.).

What is happening here, and how can I trap this error.

Thanks so much.
ColdCoffee
ColdCoffee
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Please read about TRY CATCH block from MSDN ONline or Books Online to know about the scenarios where TRY will enter CATCH when an error is encountered. NOT ALL ERRORS are captured by TRY block.:-)
mymail.default
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Say Hey Kid
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Sure.

But how do you trap these kinds of errors!
tertiusdp
tertiusdp
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BOL says to not use sp_attach_db - it has been deprecated.

That said, sp_attach_db and CREATE database... (replacement for sp_attach_db) is not being trapped when using a catch block.

So no closer to an answer.
mymail.default
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ok, thanks.
VSSGeorge
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Hi
Refer this link

http://beyondrelational.com/blogs/ashish/archive/2009/05/09/error-exception-handling-in-sql-server-2005.aspx
tertiusdp
tertiusdp
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I read the link and I do not get how it helps. Can you explain?
Try..Catch is fine, but the problem in this case is that the catch block is not being used when there is an error.
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I echo tertiusdp's comments.
MyDoggieJessie
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(from MSDN)
TRY…CATCH constructs will not fire:

1. Warnings or informational messages that have a severity of 10 or lower.

2. Errors that have a severity of 20 or higher that stop the SQL Server Database Engine task processing for the session. If an error occurs that has severity of 20 or higher and the database connection is not disrupted, TRY…CATCH will handle the error.

3. Attentions, such as client-interrupt requests or broken client connections.

4. When the session is ended by a system administrator by using the KILL statement.

______________________________________________________________________________
"Never argue with an idiot; They'll drag you down to their level and beat you with experience" ;-)
tertiusdp
tertiusdp
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What I am missing is that the error is:

Msg 5133, Level 16, State 1, Line 1
Directory lookup for the file "W:\myDB.mdf" failed with the operating system error 3(The system cannot find the path specified.).

Level 16 should be cought if I read the MSDN docs correctly.
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