This document contains VBA code for connecting to an Excel database, populating drop down lists from the database, and displaying filtered data on a worksheet based on user selections in the drop downs. The code opens an ADODB connection to the active Excel workbook, populates unit type and city drop downs by running SQL queries on the data, clears existing filtered results, builds an SQL statement based on user selections, runs the query and displays the results on a worksheet.

1. 'Database connectivity coding
--------------------------------
Option Explicit
Public cnn As New ADODB.Connection
Public rs As New ADODB.Recordset
Public strSQL As String
Public Sub OpenDB()
If cnn.State = adStateOpen Then cnn.Close
cnn.ConnectionString = "Driver={Microsoft Excel Driver (*.xls, *.xlsx,
*.xlsm, *.xlsb)};DBQ=" & _
ActiveWorkbook.Path & Application.PathSeparator & ActiveWorkbook.Name
cnn.Open
End Sub
Public Sub closeRS()
If rs.State = adStateOpen Then rs.Close
rs.CursorLocation = adUseClient
End Sub
==============================================
'Clear
----------------------------------
Private Sub cmdCLEAR_Click()
Sheet1.cmbUnitType.Clear
Sheet1.cmbCity.Clear
Sheet1.Visible = True
Sheet1.Select
Range("Result").Select
Range(Selection, Selection.End(xlDown)).ClearContents
End Sub
===============================================
'Update drop down
-----------------------------
Private Sub cmdUpdate_Click()
strSQL = "Select Distinct [Unit Type] From [data$] Order by [Unit Type]"
closeRS
OpenDB
Sheet1.cmbUnitType.Clear
rs.Open strSQL, cnn, adOpenKeyset, adLockOptimistic
If rs.RecordCount > 0 Then
Do While Not rs.EOF
Sheet1.cmbUnitType.AddItem rs.Fields(0)
rs.MoveNext
Loop
Else
MsgBox "I was not able to find any unique Products.", vbCritical +
vbOKOnly
Exit Sub
End If
strSQL = "Select Distinct [City] From [data$] Order by [City]"
closeRS
OpenDB
Sheet1.cmbCity.Clear
rs.Open strSQL, cnn, adOpenKeyset, adLockOptimistic
If rs.RecordCount > 0 Then
Do While Not rs.EOF
Sheet1.cmbCity.AddItem rs.Fields(0)
rs.MoveNext

2. Loop
Else
MsgBox "I was not able to find any unique Products.", vbCritical +
vbOKOnly
Exit Sub
End If
End Sub
====================================================
'Show the data
--------------------------------------
Private Sub cmdShow_Click()
strSQL = "SELECT * FROM [data$] WHERE "
If Sheet1.cmbUnitType.Text <> "" Then
strSQL = strSQL & " [Unit Type]='" & Sheet1.cmbUnitType.Text & "'"
End If
If Sheet1.cmbCity.Text <> "" Then
If Sheet1.cmbUnitType.Text <> "" Then
strSQL = strSQL & " AND [City]='" & Sheet1.cmbCity.Text & "'"
Else
strSQL = strSQL & " [City]='" & Sheet1.cmbCity.Text & "'"
End If
End If
If Sheet1.cmbUnitType.Text <> "" Or Sheet1.cmbCity.Text <> "" Then
'now extract data
closeRS
OpenDB
rs.Open strSQL, cnn, adOpenKeyset, adLockOptimistic
If rs.RecordCount > 0 Then
Sheets("View").Visible = True
Sheets("View").Select
Range("Result").Select
Range(Selection, Selection.End(xlDown)).ClearContents
'Now putting the data on the sheet
ActiveCell.CopyFromRecordset rs
Else
MsgBox "I was not able to find any matching records.", vbExclamation
+ vbOKOnly
Exit Sub
End If
End If
End Sub