Question

Using CASE Statement in WHERE CLAUSE (SQL SERVER 2000)

Asked by: pepringle

As system analysis I am reviewing some stored procedures.  In one case I asked the developer to create a selectmatching stored procedure that would get as parameters all fields on the table.  If a value was received for a specific parameter, the procedure had to filter on that value.  If a NULL was received for a specific parameter, the procedure should not filter on it.  The developer came up with this:

CREATE     PROCEDURE dbo.ErrorMessageSelectMatching(
@ErrorMessageID integer,
@ErrorMessageDesc varchar(1024),
@FailureActionID integer,
@ErrorSeverityID integer,
@ReturnValue integer output)

AS

SET TRANSACTION ISOLATION LEVEL READ COMMITTED
SET NOCOUNT ON

DECLARE @SQL varchar(2000)

SET @SQL =
'
SELECT
  ErrorMessageID,
  ErrorMessageDesc,
  FailureActionID,
  ErrorSeverityID
FROM
  ErrorMessage
WHERE
  1 = 1 '
  +
  CASE       WHEN @ErrorMessageID IS NULL THEN ''
      ELSE ' AND ErrorMessageID = ' + CAST(@ErrorMessageID AS varchar(10)) END
  +
  CASE       WHEN @ErrorMessageDesc IS NULL THEN ''
      WHEN @ErrorMessageDesc = '' THEN ''
      ELSE ' AND ErrorMessageDesc = ''' + @ErrorMessageDesc END + ''''
  +
  CASE       WHEN @FailureActionID IS NULL THEN ''
      ELSE ' AND FailureActionID = ' + CAST(@FailureActionID AS varchar(10)) END
  +
  CASE       WHEN @ErrorSeverityID IS NULL THEN ''
      ELSE ' AND ErrorSeverityID = ' + CAST(@ErrorSeverityID AS varchar(10)) END

EXECUTE (@SQL)

SET @ReturnValue = @@ERROR

While the above should do the trick, there should be a better way of doing it.  Is there?



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Asked On
2004-07-08 at 23:45:46ID21052971
Tags

case

,

clause

,

where

,

sql

,

statement

Topic

Databases Miscellaneous

Participating Experts
1
Points
125
Comments
4

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Answers

 

by: LowfatspreadPosted on 2004-07-09 at 00:27:36ID: 11509526

i would assume that a straight singleton
sql statement would suffice... I can't believe that you'd  index the columns
indivually (or have any need to do so!)

if you must go with the dynamic sql variant then at least get rid of the  1 = 1 at the
start of the where clause...

SELECT
  ErrorMessageID,
  ErrorMessageDesc,
  FailureActionID,
  ErrorSeverityID
FROM
  ErrorMessage
WHERE
( @ErrorMessageID IS NULL or  ErrorMessageID =@ErrorMessageID)
and (@ErrorMessageDesc IS NULL or  ErrorMessageDesc = @ErrorMessageDesc )  
and (@FailureActionID IS NULL or FailureActionID = @FailureActionID )
and ( @ErrorSeverityID IS NULL or ErrorSeverityID = @ErrorSeverityID)



20120131-EE-VQP-002

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