How to update large count of rows without locking them

Found this interesting, how to update large databases, so that you don't have to lock rows
http://blogs.msdn.com/sqlpfe/archive/2010/01/06/tsql-coding-patterns-i.aspx

So instead of the usual:

 UPDATE dbo.Foo

SET Column = 'Value'

Try:

DECLARE @UpdatedRows(PK_Id int NOT NULL PRIMARY KEY)

DECLARE @var INT

SELECT @var=0 -- this resets @@ROWCOUNT=1

WHILE @@ROWCOUNT >0

BEGIN

UPDATE TOP(1500) BAR

  SET Column='Value'

OUTPUT inserted.PK_ID

INTO  @UpdatedRows

FROM  dbo.BAR as BAR

WHERE NOT EXISTS (SELECT 1 FROM @UpdatedRows UPD WHERE UPD.PK_ID=BAR.PK_ID)

END

I prefer one of the ways the commentator offered: (easier to follow)

WHILE @@ROWCOUNT >0

BEGIN

 UPDATE TOP(1500) BAR

   SET Column='Value'

 WHERE

   Column <> 'Value'

END