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Scope of @@rowcount


Scope of @@rowcount

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BeginnerBug
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whts the scope of @@rowcount

for ex

begin
insert stmt
if @@rowcount>0
begin
insert stmt
if @@rowcount>0-- will it be affected by the first insert statement?
do smthg
end
end

any help?
tommyh
tommyh
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Yes. As in Yes it will get effected.

/T
BeginnerBug
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but that shouldnt affect from first @@rowcount value..right?.. is thr any other way to make sure a rows are inserted or updated?
Lowell
Lowell
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every insert/update/select/set/delete statement resets the @@rowcount to the rows affected by the executed statement, so it's a best practice to use a variable to capture the rowcount you need,:

begin
declare @myrowcount int,
@myrowcount2 int
insert stmt
SET @myrowcount=@@rowcount
if @myrowcount>0
begin
insert stmt
SET @myrowcount2 =@@rowcount
if @myrowcount2 >0-- will it be affected by the first insert statement?
do smthg
end
end



Lowell
--help us help you! If you post a question, make sure you include a CREATE TABLE... statement and INSERT INTO... statement into that table to give the volunteers here representative data. with your description of the problem, we can provide a tested, verifiable solution to your question! asking the question the right way gets you a tested answer the fastest way possible!
BeginnerBug
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Thanks Lowell!!!!
GilaMonster
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Lowell (10/12/2010)
every insert/update/select/set/delete statement resets the @@rowcount to the rows affected by the executed statement


It's more general than that. It's just about every statement.

SELECT * FROM master.sys.objects -- 74 rows
IF (1=1)
SELECT @@ROWCOUNT AS RowsAffected -- 0, because the IF did not affect any rows



Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

We walk in the dark places no others will enter
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Lowell
Lowell
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GilaMonster (10/12/2010)

It's more general than that. It's just about every statement.

SELECT * FROM master.sys.objects -- 74 rows
IF (1=1)
SELECT @@ROWCOUNT AS RowsAffected -- 0, because the IF did not affect any rows



wow i did not know that even an IF statement affects it! thanks once again Gail!

Lowell
--help us help you! If you post a question, make sure you include a CREATE TABLE... statement and INSERT INTO... statement into that table to give the volunteers here representative data. with your description of the problem, we can provide a tested, verifiable solution to your question! asking the question the right way gets you a tested answer the fastest way possible!
GilaMonster
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Lowell (10/12/2010)
GilaMonster (10/12/2010)

It's more general than that. It's just about every statement.

SELECT * FROM master.sys.objects -- 74 rows
IF (1=1)
SELECT @@ROWCOUNT AS RowsAffected -- 0, because the IF did not affect any rows



wow i did not know that even an IF statement affects it! thanks once again Gail!


I found that out after using this construct and getting really, really confused...

Insert <stuff>
IF @@Error = 0
SET @RowCount = @@RowCount
ELSE
GOTO ErrorHandler



@@Error behaves the same way.

Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

We walk in the dark places no others will enter
We stand on the bridge and no one may pass


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