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Traverse a MSSQL table without using CURSOR

, 3 Aug 2012 CPOL
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To traverse a table without cursor, you only need to add an additional field in the table with null value. Here is the code for traversing a table.
Table structure here. In my case Flag is the additional field which contains null value.
CREATE TABLE [dbo].[A](
	[Id] [int] IDENTITY(1,1) NOT NULL PRIMARY KEY,
	[Value] [int] NOT NULL,
	[Flag] [bit] NULL
) 

Here is the code for traversing

BEGIN TRY	

	BEGIN TRANSACTION

	DECLARE @Id int	
		
	WHILE  EXISTS(SELECT TOP 1 * FROM A WHERE Flag IS null)
		BEGIN	
		     --code here
			
		     SELECT TOP 1 @Id=ID FROM A WHERE Flag IS null	
		     UPDATE A WITH (TABLOCK) SET Flag=1 WHERE Id=@Id
		END

	UPDATE A  WITH (TABLOCK) SET Flag=null	
	COMMIT TRANSACTION	
	
END TRY
BEGIN CATCH

	ROLLBACK TRANSACTION
	RAISERROR ('Error, Please try again.',16,1)
		
END CATCH

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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Abdul Quader Mamun
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Bangladesh Bangladesh
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Questionwhat for? Pin
spiralni3-Aug-12 3:07
memberspiralni3-Aug-12 3:07 
AnswerRe: what for? Pin
Abdul Quader Mamun3-Aug-12 3:15
memberAbdul Quader Mamun3-Aug-12 3:15 
GeneralRe: what for? Pin
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memberPIEBALDconsult3-Aug-12 6:30 
AnswerRe: what for? Pin
John B Oliver26-Aug-12 12:34
memberJohn B Oliver26-Aug-12 12:34 
QuestionShort note Pin
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