Executing a TSQL batch multiple times using GO:
Ref:
Sometimes there is a need to execute the
same command or set of commands over and over again. This may be to
insert or update test data or it may be to put a load on your server for
performance testing. Whatever the need the easiest way to do this is
to setup a while loop and execute your code, but in SQL 2005 there is an
even easier way to do this.
SolutionIn both SQL Server 2000 and SQL Server 2005
the keyword GO tells SQL Server to execute the preceding code as one
batch. In SQL Server 2005 you have the ability to add a number after
the GO command to tell SQL Server how many times to execute the batch.
So let's take a look at a couple of examples:
Let's say you want to create a test table and load it with 1000
records. You could issue the following command and it will run the same
command 1000 times:
CREATE TABLE dbo.TEST (ID INT IDENTITY (1,1), ROWID uniqueidentifier) GO
INSERT INTO dbo.TEST (ROWID) VALUES (NEWID()) GO 1000 |
Here is another example that executes both INSERT statements 1000
times. As you can see you can add more and more statements to the
batch to be run the set number of times that is specified after the GO.
CREATE TABLE dbo.TEST (ID INT IDENTITY (1,1), ROWID uniqueidentifier) CREATE TABLE dbo.TEST2 (ID INT IDENTITY (1,1), ROWID uniqueidentifier) GO
INSERT INTO dbo.TEST (ROWID) VALUES (NEWID()) INSERT INTO dbo.TEST2 (ROWID) VALUES (NEWID()) GO 1000 |
To do something similar to this in SQL Server 2000 you would need to
write code such as the following. It is not that big a deal, but writing
GO 1000 seems a bit easier to me.
CREATE TABLE dbo.TEST (ID INT IDENTITY (1,1), ROWID uniqueidentifier) CREATE TABLE dbo.TEST2 (ID INT IDENTITY (1,1), ROWID uniqueidentifier) GO
DECLARE @counter INT
SET @counter = 0
WHILE @counter < 1000
BEGIN
INSERT INTO dbo.TEST (ROWID) VALUES (NEWID())
INSERT INTO dbo.TEST2 (ROWID) VALUES (NEWID())
SET @counter = @counter + 1
END |
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