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Dealing with Null in VBA sql statement

Posted on 2016-11-17
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Last Modified: 2016-11-18
hello,

Is there a way to deal with Null:


Dim mylookup As String

mylookup = DLookup("Key", "tblHWWPass", "Key=" & Result & " And IsNull(DateReturned)")

If mylookup >0 then


Get the error box on the mylookup:  Invalid use of Null
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Question by:Ernest Grogg
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9 Comments
 
LVL 120

Expert Comment

by:Rey Obrero (Capricorn1)
ID: 41892212
Dim mylookup As String

 mylookup = DLookup("[Key]", "tblHWWPass", "[Key]=" & Result & " And DateReturned Is Null")
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Expert Comment

by:Rey Obrero (Capricorn1)
ID: 41892214
you can also try this

mylookup = DLookup("[Key]", "tblHWWPass", "[Key]=" & Result & " And DateReturned & ""=""")
0
 

Author Comment

by:Ernest Grogg
ID: 41892224
Your second option does work but doesn't give the return

Key #

that is Null

It does return the key# but doesn't seem to care if the DateReturned is not null or is null
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LVL 120

Expert Comment

by:Rey Obrero (Capricorn1)
ID: 41892230
if Key is string

mylookup = DLookup("[Key]", "tblHWWPass", "[Key]='" & Result & "' And DateReturned & ""=""")

can you upload a copy of the db
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LVL 37

Expert Comment

by:PatHartman
ID: 41892257
Deal with null, how?  You have mylookup  dim'd as a string.  Strings can't hold null values.  So either stop the DLookup() from returning null or change mylookup  to be a variant.

mylookup = Nz(DLookup("Key", "tblHWWPass", "Key=" & Result & " And IsNull(DateReturned)"), "empty")

That expression "deals" will null but may not serve your needs.
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Author Comment

by:Ernest Grogg
ID: 41892271
Here is a copy of the db...

Sorry took me so long...
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LVL 120

Expert Comment

by:Rey Obrero (Capricorn1)
ID: 41892280
try
dim mylookup as long
mylookup = DLookup("[Key]", "tblHWWPass", "[Key]=" & Result & " And DateReturned & ""=""")
1
 
LVL 37

Accepted Solution

by:
PatHartman earned 500 total points
ID: 41892284
Apparently you were busy creating the PP and didn't see my answer.

I'll amend it

Change the data type of myloopup to Integer.
Change DLookup() to DCount()

That makes more sense with the code around it.
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Author Closing Comment

by:Ernest Grogg
ID: 41892292
great.


Thanks, works...
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