VBA - Accessing a collection of values - ms-access

Question

I have two access forms. frm_Main and frm_Sub which has data conditionally displayed depending on the selections of the main form. I need to write a select all function for items displayed in frm_Sub. In VBA is there a way that I can get a list of the id's currently being displayed in frm_Sub?
for example, if I do this
me.controls("Svc_Tag_Dim_Tag_Num").value
I get the value for one of rows in the frm_Sub, is there a way to get all of the values?
Maybe I can ask a different way. I have a form that is displayed as a listview, in VBA, is there a way to get all the values from a specific column?

Answer 1

Another option is to write a function that concatenates the PKs of the recordset that the subform displays. Say your main form is Company and your subform lists Employees. You'd have a LinkMasterFields and LinkChildFields properties of the subform control would be CompanyID (PK of the Company table, FK of the Employees table).
Thus, to get the same set of records as is displayed in the subform when the parent is on a particular Company record:
Dim db As DAO.Database
Dim strSQL As String
Dim rst As DAO.Recordset
Dim strEmployeeIDList As String
Set db = CurrentDB
strSQL = "SELECT Employees.* FROM Employees WHERE CompanyID="
strSQL = strSQL & Me!CompanyID & ";"
Set rs = db.OpenRecordset(strSQL)
If rs.RecordCount > 0 Then
With rs
.MoveFirst
Do Until .EOF
strEmployeeIDList = strEmployeeIDList & ", " & !CompanyID
.MoveNext
Loop
End With
strEmployeeIDList = Mid(strEmployeeIDList, 3)
End If
rs.Close
Set rs = Nothing
Set db = Nothing
Now, why would you do this instead of walking through an already-opened recordset (i.e., the subform's RecordsetClone)? I don't know -- it's just that there may be cases where you don't want your lookup to be tied to a particular form/subform. You could fix that by making your function that concatenates accept a recordset, and pass it a recordset declared as I did above, or pass it the subform's RecordsetClone. In that case, you could use the concatenation function either way, without being tied to the form/subform.

Answer 2

If I understand your question you should be able to access the ID value in the control using Column(x) where x indicates the control's row source column starting from 0. For example, if ID is in column 0 with width 0 in. it will be hidden from view but VBA can "see" it as me.controls.["Svc_Tag_Dim_Tag_Num"].column(0).
To get at the sub-form's record source directly from outside the form's class module you could create a function something like:
Public Function test_get_sub_form_record_set() As String
Dim dbs As Database
Dim rst As Recordset
Dim xcat As String
Set dbs = CurrentDb()
Set rst = [Forms]![Your Main Form Name]![Your Sub-form Name].[Form].RecordsetClone
If rst.RecordCount > 0 Then
rst.MoveFirst
xcat = rst!ID
rst.MoveNext
Do While Not rst.EOF
xcat = xcat & ", " & rst!ID
Loop
Else
xcat = ""
End If
test_get_sub_form_record_set = xcat
rst.Close
Set dbs = Nothing
End Function
This would be included in a separate module and when called would return a concatenated, comma separated list of ID's.