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Evaluating a empty date field with Crystal Syntax

Posted on 2002-07-11
9
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Last Modified: 2007-12-19
I am trying to populate a field with one of three values based on this if statement.  Everything seems to evaluate properly except the "{@datecompleted}=Date (0,0,0)".  I thought this was the correct way to check for an empty date field but I guess I am wrong.  Can anyone help me out?

if ({@datecompleted} > {@daterequired}  )
then
"CLate"
Else if{@daysout}>60 and {@datecompleted}=Date (0,0,0)
then
"NLate"
Else
"On Time"
0
Comment
Question by:ccarlson62
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9 Comments
 
LVL 12

Expert Comment

by:DRRYAN3
ID: 7146405
ccarlson62

Try one of the following:

Else if {@daysout}>60 and {@datecompleted} <= date(0,0,0)

or this one

Else if {@daysout}>60 and {@datecompleted} <= date(0,0,0,0,0,0)

Depending on your database, you may need to check to see if the date is LESS THAN a null date value instead of EQUAL TO.  You may also need to explicitly null the time components of a date-time variable by including the extra 3 zeros.

DRRYAN3
0
 
LVL 100

Expert Comment

by:mlmcc
ID: 7146950
You might also have to check as

Else if {@daysout}>60 and IsNull({@datecompleted})

mlmcc
0
 

Author Comment

by:ccarlson62
ID: 7149954
Thanks for the suggestions

I Have tried:

Else if {@daysout}>60 and {@datecompleted} <= date(0,0,0)

and this one...

Else if {@daysout}>60 and {@datecompleted} <= date(0,0,0,0,0,0)

and this one....

Else if {@daysout}>60 and IsNull({@datecompleted})

No luck so far, I am upping the points to 100 since this  does not look like it is going to be as simple as I had hoped.

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LVL 12

Expert Comment

by:DRRYAN3
ID: 7150746
What database is the source of your data and which CR driver are you using to get to it?  Also, what version of CR do you have?
0
 

Author Comment

by:ccarlson62
ID: 7150785
I am using Crystal 8.5

I am using the Notes SQL Driver ver. 3.01

I am going after Data in a Domino Database Domino server ver. 5.0.10
0
 
LVL 12

Expert Comment

by:DRRYAN3
ID: 7150952
I don't have Domino to test against.  

Perhaps Domino is not storing empty dates as a null value.  I searched the Domino Developer web site without success on this.  What value is in @datecompleted for a record you know to have a null value?

Last question - how have you declared the @datecompleted variable in your Crystal formula?
0
 
LVL 4

Accepted Solution

by:
jsweby earned 100 total points
ID: 7172824
I have successfully used the IsNull test before, however it MUST be the FIRST test done on that field, so intead of

if {@daysout}>60 and IsNull({@datecompleted})

use

if IsNull({@datecompleted}) and {@daysout}>60

J.
0
 
LVL 5

Expert Comment

by:gawilson2000
ID: 7224208
I have had a lot of trouble with null dates before too.

So I just check for:
ToText({@datecompleted}) = ''
0
 
LVL 5

Expert Comment

by:gawilson2000
ID: 7738634
You should be very wary with this solution.  

Another programmer may come along at a later date and add more code at the beginning.

I think that you will find that my code works regardless of the position.
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