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  1. #1
    Ruegen's Avatar
    Ruegen is offline VIP
    Windows 7 64bit Access 2010 64bit
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    After update puzzle for looking up value that might not be there

    I have a after update event on a combo box that does a dlookup to grab the person that is allocated to the area. Areas are allocated to a school which is related to a bookings table

    using

    BookerIDBonus = DLookup("TourOrganiserID", "tblTourOrganiser", "TourOrganiserID=" & TourOrganiserID)
    BookerIDBonusName = DLookup("MergedNameT", "tblTourOrganiser", "TourOrganiserID=" & TourOrganiserID)
    it pulls in the person from the tblTourOrganiser table.

    However.

    If a school is allocated to an area but no person is allocated to an area yet then there is no id then for it to pull I get an error and runtime shutown (runtime just crashes on errors).



    In access how would I get around this that if I ran into this rare problem it wouldn't crash. How can I get around this? Ask an "if null" ?

  2. #2
    June7's Avatar
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    Windows 7 64bit Access 2010 32bit
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    Use Nz().

    Nz(DLookup("MergedNameT", "tblTourOrganiser", "TourOrganiserID=" & TourOrganiserID),"")
    How to attach file: http://www.accessforums.net/showthread.php?t=70301 To provide db: copy, remove confidential data, run compact & repair, zip w/Windows Compression.

  3. #3
    Ruegen's Avatar
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    Quote Originally Posted by June7 View Post
    Use Nz().

    Nz(DLookup("MergedNameT", "tblTourOrganiser", "TourOrganiserID=" & TourOrganiserID),"")
    I haven't tested it yet but I am pretty sure that will work... I will give you an update

    thanks for the quick help!

  4. #4
    Ruegen's Avatar
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    I was using Nz(DLookup("MergedNameT", "tblTourOrganiser", "TourOrganiserID=" & TourOrganiserID),"")

    instead of

    Nz(DLookup("MergedNameT", "tblTourOrganiser", [TourOrganiserID],"")

  5. #5
    June7's Avatar
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    I am confused by that statement - is it backwards? The second structure should fail.
    How to attach file: http://www.accessforums.net/showthread.php?t=70301 To provide db: copy, remove confidential data, run compact & repair, zip w/Windows Compression.

Please reply to this thread with any new information or opinions.

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