Avoiding the transaction

Question

Avoiding the transaction

Steve Jones - SSC Editor

SSC Guru

Points: 734449
More actions
September 7, 2020 at 12:00 am

#3782558

Comments posted to this topic are about the item Avoiding the transaction

Viewing 5 posts - 1 through 4 (of 4 total)

You must be logged in to reply to this topic. Login to reply

Stewart "Arturius" Campbell SSC Guru Points: 72498 More actions · Answer 1

Nice, easy question to start the week on, thanks Steve.

____________________________________________
Space, the final frontier? not any more...
All limits henceforth are self-imposed.
“libera tute vulgaris ex”

Eirikur Eiriksson SSC Guru Points: 182882 More actions · Answer 2

Thanks Steve, good question.

My take on it is that "begin tran --- rollback" = "Oops"

😎

On a more serious note, many do not understand the difference between SET and SELECT in this context, if one changes the code to:

DECLARE @salary INT = 1000;
 BEGIN TRAN
 SET @salary = @salary * 2;
 ROLLBACK
 SELECT @salary;

then the result will be 2000, as the SET statement is NOT a part of the transaction, even if it occurs within the BEGIN - END section.

😉

This reply was modified 3 years, 7 months ago by Eirikur Eiriksson.

Steve Jones - SSC Editor SSC Guru Points: 734449 More actions · Answer 3

This is an illustration, not real code. Presumably, you might have lots of other code that checks for the need to rollback.

However, I'm not sure SET and SELECT impact the transaction with a local variable. The local variable is outside the tran.

Eirikur Eiriksson SSC Guru Points: 182882 More actions · Answer 4

Steve Jones - SSC Editor wrote:

This is an illustration, not real code. Presumably, you might have lots of other code that checks for the need to rollback.
However, I'm not sure SET and SELECT impact the transaction with a local variable. The local variable is outside the tran.

Sorry Steve, there is no difference, my mind was somewhere else.

😎