Solved

Error counting number of users logged into the same database

Posted on 2011-03-03
8
251 Views
Last Modified: 2012-05-11
I have a function that counts the number of users logged into and Access 2003 front-end running on a server.  This code (originally supplied via an EE post) has been working for years, but this morning I went onto a site and got an Error number 13 (type mismatch) error.

I haven't changed anything on this code (that I am aware of), but am wondering why it might not work.

Any suggestions would be massively appreciated.
Public Function CountUsers() As Long

    Const USERROSTER_SCHEMA As String = "{947bb102-5d43-11d1-bdbf-00c04fb92675}"  ' User roster schema GUID
    Dim rstUserRoster As ADODB.Recordset  ' User roster recordset 
    Set rstUserRoster = CurrentProject.Connection.OpenSchema(adSchemaProviderSpecific, , USERROSTER_SCHEMA)

    Do Until rstUserRoster.EOF
        CountUsers = CountUsers + 1  ' Can't use RecordCount!
        rstUserRoster.MoveNext
    Loop

end function

Open in new window

0
Comment
Question by:Andy Brown
[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
  • 5
  • 3
8 Comments
 

Author Comment

by:Andy Brown
ID: 35025882
Ah should have said, the error is caused when the:

Set rstUserRoster = CurrentProject.Connection.OpenSchema(adSchemaProviderSpecific, , USERROSTER_SCHEMA)

is run.  I do have some error correction on this function (I just removed it to make it easier to read).
0
 
LVL 85
ID: 35026978
My first thought would be a bad/corrupt installation of MDAC. You can determine this by running Component Checker (http://www.microsoft.com/downloads/en/details.aspx?FamilyID=8f0a8df6-4a21-4b43-bf53-14332ef092c9). This checks your installation of MDAC (of which ADO is a component) and tells you if there are issues.
0
 

Author Comment

by:Andy Brown
ID: 35028098
Will do, the only other thing that I can think of is that I installed Win 7 SP1 over the weekend on my machine, compiled the front-end and and then took over the MDE file with me this morning.  Although I cannot see how this would have affected the code, it was the only thing that sprang to mind.
0
Online Training Solution

Drastically shorten your training time with WalkMe's advanced online training solution that Guides your trainees to action. Forget about retraining and skyrocket knowledge retention rates.

 
LVL 85

Accepted Solution

by:
Scott McDaniel (Microsoft Access MVP - EE MVE ) earned 500 total points
ID: 35033052
< I installed Win 7 SP1 over the weekend on my machine>

That could be your trouble. SP1 caused some catastrophic issues with MDAC/ADO:

http://social.msdn.microsoft.com/Forums/en-US/windowsgeneraldevelopmentissues/thread/3a4ce946-effa-4f77-98a6-34f11c6b5a13

Basically, Microsoft's answer is "use late binding", i.e.:


 Set rstUserRoster = CreateObject("ADODB.Recordset")
 Set rstUserRoser = CurrentProject.Connection.OpenSchema(adSchemaProviderSpecific, , USERROSTER_SCHEMA)

I"m not sure that would work either.

You can also uninstall the Service Pack, or do one of the other fixes mentioned.

0
 

Author Comment

by:Andy Brown
ID: 35034763
Thanks LSM,

Just before I start playing.  Are you aware of any other (potentially safer) ways to determine the number of users logged in (I'm not using an .mdw file)?

0
 
LVL 85
ID: 35035201
No. The Schema method is the most reliable method of doing this.
0
 

Author Closing Comment

by:Andy Brown
ID: 35035397
Thanks LSM - I've updated the code, and will go on-site, on monday to give it a blast.

Thanks as always - have a great weekend.
0
 

Author Comment

by:Andy Brown
ID: 35067988
Just to let you know - the late binding worked fine - thanks again.
0

Featured Post

Technology Partners: 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

This article describes two methods for creating a combo box that can be used to add new items to the row source -- one for simple lookup tables, and one for a more complex row source where the new item needs data for several fields.
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.
In Microsoft Access, learn how to “cascade” or have the displayed data of one combo control depend upon what’s entered in another. Base the dependent combo on a query for its row source: Add a reference to the first combo on the form as criteria i…
In Microsoft Access, learn different ways of passing a string value within a string argument. Also learn what a “Type Mis-match” error is about.

707 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