help with Update query -- t-sql

Hello Experts!

I am trying to capture an error message if the below transaction fails. In the CATCH block, I am setting the error message to @errormessage variable, but this will not work.

How can I capture that particular record for which the update failed?

declare @ErrorMessage varchar(4000) = ''

 BEGIN TRAN trn1
	BEGIN TRY
		update p
		set p.Professional_Id = s.Destination_Professional_Id
		from tblPhys p, dbo.Prof s
		where p.Professional_Id = s.Source_Professional_Id
		  and s.Source_Professional_Id IS NOT NULL
	      and EXISTS (SELECT * FROM dbo.tblPhys AS tp WHERE tp.Professional_Id = s.Destination_Professional_Id AND tp.PhysicianId = p.PhysicianId)
 COMMIT TRAN trn1
	END TRY
	BEGIN CATCH
		IF @@TRANCOUNT > 0 
		ROLLBACK TRAN trn1
		Set @ErrorMessage = @ErrorMessage +  ' Update Failed for ProfesstionalId from S: ' + convert(varchar(20), s.Destination_Professional_Id) + Error_message() + ' failed at trn1'
	END CATCH

Open in new window


Thanks in advance!!!!
ravichand-sqlAsked:
Who is Participating?
 
Anthony PerkinsCommented:
What I am getting at is that you as the Developer know all the potential logical errors and should query for them explicitly.  We can certainly help you with that.

In the meantime, at the very least correct your code as follows:
DECLARE @ErrorMessage varchar(4000) = ''

BEGIN TRY
    UPDATE  p
    SET     p.Professional_Id = s.Destination_Professional_Id
    FROM    tblPhys p
            INNER JOIN dbo.Prof s ON p.Professional_Id = s.Source_Professional_Id
    WHERE   -- s.Source_Professional_Id IS NOT NULL  
            EXISTS ( SELECT 1
                     FROM   dbo.tblPhys AS tp
                     WHERE  tp.Professional_Id = s.Destination_Professional_Id
                            AND tp.PhysicianId = p.PhysicianId )
END TRY
BEGIN CATCH
    SET @ErrorMessage = @ErrorMessage + ' Update Failed for ProfesstionalId from S: ' + CONVERT(varchar(20), s.Destination_Professional_Id) + ERROR_MESSAGE() + ' failed at trn1'
END CATCH

Open in new window

Notes:

1.

The TRANSACTION is pointless

2.

Use ANSI JOINs

3.

The condition s.Source_Professional_Id IS NOT NULL is not necessary.  If it is NULL then it will be excluded because of the JOIN.
0
 
Jim HornMicrosoft SQL Server Developer, Architect, and AuthorCommented:
For starters, the alias s is only active in the statement it is used, and not in future statements, so in your CATCH block s.anything will have no meaning.

>How can I capture that particular record for which the update failed?
afaik the only way to pull this off would be to select the ID of the record, save it in a variable, then perform your UPDATE.
0
 
ravichand-sqlAuthor Commented:
So, you mean I have to do 2 updates instead of 1. one for capturing the value and the other for performing the actual update ??
0
Ultimate Tool Kit for Technology Solution Provider

Broken down into practical pointers and step-by-step instructions, the IT Service Excellence Tool Kit delivers expert advice for technology solution providers. Get your free copy now.

 
Aneesh RetnakaranDatabase AdministratorCommented:
Inside the catch block use this

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;
0
 
ravichand-sqlAuthor Commented:
Aneesh,

But this will not give me the record that made the update fail, right?
0
 
Jim HornMicrosoft SQL Server Developer, Architect, and AuthorCommented:
>So, you mean I have to do 2 updates instead of 1. one for capturing the value and the other for performing the actual update ??
One select to capture the PK, then your update.
That way the PK is in a variable if needed in the CATCH block to display in a custom error message.

Unless one of my peers here can demonstrate this is possible in 1 statement, afraid so.
0
 
Jim HornMicrosoft SQL Server Developer, Architect, and AuthorCommented:
... or, throw your UPDATE into a cursor, then you have every value already as a parameter.
0
 
ravichand-sqlAuthor Commented:
Jim,

I never worked on a cursor before, could you give me a sample for the update script I have attached above?
0
 
Jim HornMicrosoft SQL Server Developer, Architect, and AuthorCommented:
>could you give me a sample for the update script I have attached above?
See http://msdn.microsoft.com/en-us/library/ms180169.aspx

Warning:  Not easy to learn.
0
 
Aneesh RetnakaranDatabase AdministratorCommented:
> But this will not give me the record that made the update fail, right?
thats correct, but you will get the error ...
0
 
Anthony PerkinsCommented:
I am trying to capture an error message if the below transaction fails
So why don't we start with what error are you are trying to capture caused by bad data? And please don't say any error.  Is is a Primary or Foreign Key or Check CONSTRAINT error?  What other errors are you trying to capture?
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

All Courses

From novice to tech pro — start learning today.