Solved

Invalid use of null in dlookup

Posted on 2006-07-05
6
502 Views
Last Modified: 2008-02-26
I keep getting an error message saying invalid use of null... please help.

Dim dSubject As String
Dim dResponsibility As String
dSubject = DLookup("designsubject", "tblpart", "isnull(DesignRespond) And DateDiff('d', DesignStartDate, Now()) <= 3")
dResponsibility = DLookup("designresponsibility", "tblpart", "DesignRespond Is Null And DateDiff('d', DesignStartDate, Now()) <= 3")
If Not IsNull(dSubject) Then
    DoCmd.SendObject acSendNoObject, , acFormatHTML, "rgrguric@yahoo.com", , , "Employee has not responded for DESIGN responsibility, please review!!!", "User " & dResponsibility & " has not responded for DESIGN responsibility on " & dSubject & ".", False
End If

Thanks,
0
Comment
Question by:rgrguric
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
6 Comments
 
LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 17045317

Dim dSubject As String
Dim dResponsibility As String
dSubject = DLookup("designsubject", "tblpart", "DesignRespond is null And DateDiff('d', DesignStartDate, Now()) <= 3")
dResponsibility = DLookup("designresponsibility", "tblpart", "DesignRespond Is Null And DateDiff('d', DesignStartDate, Now()) <= 3")
If Not IsNull(dSubject) Then
0
 

Author Comment

by:rgrguric
ID: 17045342
I put that in and I'm still receiveing the error same error message.
0
 
LVL 143

Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 500 total points
ID: 17045396

Dim dSubject As variant
Dim dResponsibility As variant
dSubject = DLookup("designsubject", "tblpart", "DesignRespond is null And DateDiff('d', DesignStartDate, Now()) <= 3")
dResponsibility = DLookup("designresponsibility", "tblpart", "DesignRespond Is Null And DateDiff('d', DesignStartDate, Now()) <= 3")
If Not IsNull(dSubject) Then
0
Migrating Your Company's PCs

To keep pace with competitors, businesses must keep employees productive, and that means providing them with the latest technology. This document provides the tips and tricks you need to help you migrate an outdated PC fleet to new desktops, laptops, and tablets.

 
LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 17045400
explanation: only VARIANT and OBJECT data types can get a NULL value, string, integer etc cannot (will raise the error you have)
0
 
LVL 65

Expert Comment

by:rockiroads
ID: 17045422
wrap DLOOKUP with ""


Dim dSubject As String
Dim dResponsibility As String


dSubject = NZ(DLookup("designsubject", "tblpart", "DesignRespond is null And DateDiff('d', DesignStartDate, Now()) <= 3"),"")
dResponsibility = NZ(DLookup("designresponsibility", "tblpart", "DesignRespond Is Null And DateDiff('d', DesignStartDate, Now()) <= 3"),"")

Now u can check for empty string

if dSubject = "" then
    msgbox "No Subject"
endif


U can use NZ to give a default value instead of "" instead
0
 
LVL 65

Expert Comment

by:rockiroads
ID: 17045425
wrap DLOOKUP with NZ is what Im supposed to have said, oops
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Calculate Weeks in A "Fiscal Month" 8 64
Menus 6 56
Getting the 7Z zip dll to work with MS Access 8 59
Database (Access Table) Security Access 8 60
In earlier versions of Windows (XP and before), you could drag a database to the taskbar, where it would appear as a taskbar icon to open that database.  This article shows how to recreate this functionality in Windows 7 through 10.
In Part II of this series, I will discuss how to identify all open instances of Excel and enumerate the workbooks, spreadsheets, and named ranges within each of those instances.
Familiarize people with the process of retrieving data from SQL Server using an Access pass-thru query. Microsoft Access is a very powerful client/server development tool. One of the ways that you can retrieve data from a SQL Server is by using a pa…
Show developers how to use a criteria form to limit the data that appears on an Access report. It is a common requirement that users can specify the criteria for a report at runtime. The easiest way to accomplish this is using a criteria form that a…

739 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question