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Multiple List box selection

Posted on 2016-08-02
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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.
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Question by:simpkinst
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5 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

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