?
Solved

Multiple List box selection

Posted on 2016-08-02
5
Medium Priority
?
37 Views
Last Modified: 2016-08-05
I have a multi select list box on a form with a pretty intensive select query and I would like to use what the user selects as the criteria for the intensive query. I have a function that gets the information correctly but when it returns the selection to the query, it is like it returns nothing or something that the query doesn't like. Below you will see the function:

Function SQL_Criteria() As String
Dim varItem As Variant
Dim strCriteria As String
Dim ctrl As Control

Set ctrl = [Forms]![frmMain1].MPN
strCriteria = "'"

For Each varItem In ctrl.ItemsSelected
    strCriteria = strCriteria + ctrl.Column(0, varItem) & "','"
Next varItem
If strCriteria = "'" Then
    SQL_Criteria = "Like '*'"
Else
    SQL_Criteria = "IN(" & Left(strCriteria, Len(strCriteria) - 2) & ")"
End If
   
End Function

I put the call to this function in my where clause, but it doesn't seem to run correctly. It doesn't give me an error just an empty table.

Thanks in advance for all your help.
0
Comment
Question by:simpkinst
  • 2
  • 2
4 Comments
 
LVL 40

Accepted Solution

by:
PatHartman earned 2000 total points
ID: 41739609
You can't build a WHERE clause on the fly in a saved querydef.  When a querydef is saved, Access also saves the calculated execution plan.  Changing the WHERE clause would invalidate the execution plan.  

You will need to build the entire SQL string with code.  Then you can concatenate in the selections.

Dim strSQL as String
strSQL = "Select .... From .... Where "
strSQL = strSQL &  "IN(" & Left(strCriteria, Len(strCriteria) - 2) & ")"

Open in new window

Then use the SQL string
0
 
LVL 40

Expert Comment

by:PatHartman
ID: 41739743
The appropriate way to close this would be to post your solution and then select that as the answer.
1
 

Author Comment

by:simpkinst
ID: 41740433
I noticed that the querydef was adding in an "=" sign to the code so I figured out that I had to build the SQL myself as noted above, I had not seen this answer by the time I had figured it out. Thank you, for your help.
0
 

Author Closing Comment

by:simpkinst
ID: 41740437
Thanks for your help.
0

Featured Post

Concerto Cloud for Software Providers & ISVs

Can Concerto Cloud Services help you focus on evolving your application offerings, while delivering the best cloud experience to your customers? From DevOps to revenue models and customer support, the answer is yes!

Learn how Concerto can help you.

Question has a verified solution.

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

Instead of error trapping or hard-coding for non-updateable fields when using QODBC, let VBA automatically disable them when forms open. This way, users can view but not change the data. Part 1 explained how to use schema tables to do this. Part 2 h…
A Case Study of using the Windows API to provide RS232 communications capability in Access without the use of Active-X controls.
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.
Do you want to know how to make a graph with Microsoft Access? First, create a query with the data for the chart. Then make a blank form and add a chart control. This video also shows how to change what data is displayed on the graph as well as form…

578 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