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Using IsEmpty

Posted on 2008-10-24
Last Modified: 2010-05-18
I have the following trigger, CREATE TRIGGER trg_Asgnmnt_OutOfOffice ON dbo.Asgnmnt
      IF UPDATE(OutOfOffice) BEGIN
            UPDATE      dbo.Assignee
               SET      OutOfOffice = I.OutOfOffice,
                  OutOfOfficeUntilTime = I.OutOfOfficeUntilTime,
                  OutOfOfficeUntilDate = I.OutOfOfficeUntilDate
            FROM      dbo.Assignee A,
                  INSERTED I
            WHERE      A.LoginID = I.LoginID
              AND      I.CallID = '00010000'

If OutOfOfficeUntilDate is empty (not NULL I just found it won't be NULL) I need to set it to today's date, what would be the proper syntax i was thinking an if statement after, OutOfOfficeUntilDate = I.OutOfOfficeUntilDate but wasn't sure what the else part of the if statement should be?  Also i only want to change the value of OutOfOfficeUntilDate if that field is empty otherwise I want to keep what is in there.
Question by:wyogirl77
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LVL 39

Accepted Solution

BrandonGalderisi earned 125 total points
ID: 22800629
Well a datetime field cannot be empty.  It can either be NULL or a valid date.  If you are storing it in a string field (varchar) then you can test it with the len function.

But since you have time and date columns, and SQL doesn't support this, I guess that is what you are doing.  What format do you want your date in?

This will insert a string of each the current date and time into your table.
CREATE TRIGGER trg_Asgnmnt_OutOfOffice ON dbo.Asgnmnt
      IF UPDATE(OutOfOffice) BEGIN
            UPDATE      dbo.Assignee
               SET      OutOfOffice = I.OutOfOffice,
                  OutOfOfficeUntilTime = case when len(I.OutOfOfficeUntilTime)=0 then convert(char(8),getdate(),108) else I.OutOfOfficeUntilTime end,
                  OutOfOfficeUntilDate = case when len(I.OutOfOfficeUntilDate)=0 then convert(char(10),getdate(),101) else I.OutOfOfficeUntilDate end
            FROM      dbo.Assignee A,
                  INSERTED I
            WHERE      A.LoginID = I.LoginID
              AND      I.CallID = '00010000'

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Author Comment

ID: 22800713
The time I don't really care about so much, it is the date, which you are correct I have it in a Varchar(10) field because that is what the program I am working with stores it in, does that change your suggestion at all?
LVL 39

Expert Comment

ID: 22800770
Only to know what format you want your date in.

There's lots of options and it has to be consistent with what you have in order to be converted back into a date later down the line.



Author Comment

ID: 22813456
The date would need to be in mm/dd/yyyy
LVL 39

Expert Comment

ID: 22813504
That is format option 101 which is what I have above.  I still think it would be a good idea to store it as a single datetime field.

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