Dear experts, I am trying to use Case logic to a where statement in my stored proc. I have a Messages table that has messages a user has sent to himself or other people. I need some kind of If statement to decide what type of blnDeleted column to use. Currently i have a blnSenderDeleted and blnRecipientDeleted column. if the user is the sender of the message then a i need to check for blnSenderDeleted if the user if the recipient then i need to check for blnRecipientDeleted
I am also using SQL to handle paging.
Exmaple script:
SELECT *
FROM
(SELECT *, ROW_NUMBER() OVER(ORDER BY Message_ID) as RowNum, @Total as Total
FROM Messages m
Join LoggedInToken lt on m.Recipient_ID = lt.Member_ID
WHERE lt.Token = @Token AND 0 = Case When @MemberID = m.Sender_ID then m.blnSenderDeleted else m.blnRecipientDeleted End
blnSenderDeleted = 0 AND Type = 'Message'
) as MsgList
WHERE RowNum BETWEEN @startRowIndex AND (@startRowIndex + @maximumRows) - 1 order by dteCreated Desc
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From a syntactic point of view, you will probably have to change
(SELECT *, ROW_NUMBER() OVER(ORDER BY Message_ID) as RowNum, @Total as Total
FROM Messages m
Join LoggedInToken lt
to
(SELECT m.*, It.*, -- specify which * you're selecting
ROW_NUMBER() OVER(ORDER BY Message_ID) as RN, -- don't use the name RowNum
@Total as Total
FROM Messages m
Join LoggedInToken lt
Business Accounts
Answer for Membership
by: Raynard7Posted on 2007-03-04 at 22:16:38ID: 18652832
it all looks ok except you are probably missing an and statement
SELECT *
FROM (SELECT *
, ROW_NUMBER() OVER(ORDER BY Message_ID) as RowNum,
Total as Total
FROM MESSAGES M
JOIN LOGGEDINTOKEN LT
ON M.RECIPIENT_ID = LT.MEMBER_ID
WHERE LT.TOKEN = @Token
AND CASE
WHEN @MemberID = M.SENDER_ID THEN M.BLNSENDERDELETED
ELSE M.BLNRECIPIENTDELETED
END = 0
AND BLNSENDERDELETED = 0
AND TYPE = 'Message') AS MSGLIST
WHERE ROWNUM BETWEEN @startRowIndex
AND (@startRowIndex + @maximumRows) - 1
ORDER BY DTECREATED DESC