If Not IsNull(DLookup( "[YR]", "tblCars", "[VID]=GetCurrVID()") ) Then
If DLookup("[YR]", "tblCars", "[VID]=GetCurrVID()") Then
Of the above 2 syntax variations, is the 2nd unacceptable? I use the
former because I seem to remember suggestions in this forum that
discouraged the latter. But I tire of it. To me, the latter is more
readily understood because there's no double negative to deal with.
3  1318 
MLH wrote: If Not IsNull(DLookup( "[YR]", "tblCars", "[VID]=GetCurrVID()") ) Then
If DLookup("[YR]", "tblCars", "[VID]=GetCurrVID()") Then
Of the above 2 syntax variations, is the 2nd unacceptable? I use the
former because I seem to remember suggestions in this forum that
discouraged the latter. But I tire of it. To me, the latter is more
readily understood because there's no double negative to deal with.
If the value of [YR] returned is zero or null then the expression will not work
as expected.
If the criteria finds no rows you will get null back (not false).
Using DCount() instead of DLookup() would solve both of those problems, but
might take a few more clicks to resolve.
--
Rick Brandt, Microsoft Access MVP
Email (as appropriate) to...
RBrandt at Hunter dot com
"MLH" <CR**@NorthStat e.net> wrote in message
news:11******** *************** *********@4ax.c om... If Not IsNull(DLookup( "[YR]", "tblCars", "[VID]=GetCurrVID()") ) Then
If DLookup("[YR]", "tblCars", "[VID]=GetCurrVID()") Then
Of the above 2 syntax variations, is the 2nd unacceptable? I use the
former because I seem to remember suggestions in this forum that
discouraged the latter. But I tire of it. To me, the latter is more
readily understood because there's no double negative to deal with.
If NZ(DLookup("[YR]", "tblCars", "[VID]=GetCurrVID()") , 0) <> 0 Then
Assuming [YR] = 0 is not acceptable ,
On Fri, 19 May 2006 02:39:14 GMT, "Rick Brandt"
<ri*********@ho tmail.com> wrote: MLH wrote: If Not IsNull(DLookup( "[YR]", "tblCars", "[VID]=GetCurrVID()") ) Then
If DLookup("[YR]", "tblCars", "[VID]=GetCurrVID()") Then
Of the above 2 syntax variations, is the 2nd unacceptable? I use the
former because I seem to remember suggestions in this forum that
discouraged the latter. But I tire of it. To me, the latter is more
readily understood because there's no double negative to deal with.
If the value of [YR] returned is zero or null then the expression will not work
as expected.
If the criteria finds no rows you will get null back (not false).
Using DCount() instead of DLookup() would solve both of those problems, but
might take a few more clicks to resolve.
=============== =============== =============
I see your point. I can rid myself of the dbl-neg situation
easily enough by reversing the Do This or Do That. But
I think I like your DCount suggestion better.
If [double-negative condition] Then
Do THIS if true
Else
Do THAT if false
Endif
If [straight-forward condition w/ NO dbl-neg] Then
Do THAT if true
Else
Do THIS if false
Endif This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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