My Problem is this:
I would like to use a custom ribbon Command button or even a simple command button inside the spreadsheet to initialize an OLEDB database connection and update/recalculate all the assoicated user defined functions that require such a connection, or those specified by me. I do not want any of these functions to recalculate except for when the specific button is clicked. I am having difficulty figuring out how to do this. Kindly offer your assistance or suggestions.
See below for Details on what I have done:
I currently store data within an access database from which I use vba in excel to make specific queries. I have embedded each datarequest routine within a group of functions under a module by the name [fnc]. I then access them as user-defined functions from within the excel spreadsheet. An example is given here:
Function ValueV(mm As String, yy As String, qtable As String, qcode As String, compare_period As Integer, average_period As Integer, weight As Boolean) As Variant
'Month Value Formula for Horizontal Data
'mm - month value 2-digit
'yy - year value 4-digit
'qtable - query table name eg. "cpia"
'qcode - query code for variable eg. "all0100"
'avgperiod - lag periods to average in calculation eg. 3-avgperiods for quarterly measure, 1-avgperiod for point measure.
'weight - boolean (true or false) value for weighting values given reference weight. Currently unsupported. Code should be extended to include this feature. (space holder for now)
Dim lag_value As Variant
Dim cur_value As Variant
lag_value = 0
cur_value = 0
'STEP-A: Gets the initial Value average or not.
'===============================================================
If compare_period > 0 Then
'Use this step to pickup initial value when compare_period <> 0 which requires a % change as opposed to a point value.
'Average_period must be greater than or equal to one (1). One (1) represents the current month which is the same as a point value.
lmm = fnc.lagdate(mm, yy, compare_period, "mm") 'lag month (a single month for mValueH)
lyy = fnc.lagdate(mm, yy, compare_period, "yy") 'lag year (a single month for mValueH)
smm = fnc.lagdate(mm, yy, compare_period + average_period - 1, "mm") 'dating backwards to account for average period
syy = fnc.lagdate(mm, yy, compare_period + average_period - 1, "yy") 'dating backwards to account for average period
'note, for smm & syy, the average period includes the lmm so we add back one (1)
'eg. 3-mth average is not 3-lags but current and 2-lags.
sdate1 = syy & fnc.numtext(smm)
'start date for query (begining of lag value including average period)
Set MyRecordset = New ADODB.Recordset
MySql = sql.sqlVSers(lmm, lyy, qtable, qcode, sdate1)
'MsgBox (MySql)
MyRecordset.Open MySql, MyConnect, adOpenStatic, adLockReadOnly
Do Until MyRecordset.EOF 'Loop to end and enter required values
lag_value = lag_value + MyRecordset(qcode)
MyRecordset.MoveNext
Loop
'Stop
lag_value = lag_value / average_period
MyRecordset.Close
End If
'STEP-B: Gets the current Value average or not.
'===============================================================
smm = fnc.lagdate(mm, yy, average_period - 1, "mm") 'dating backwards to account for average period
syy = fnc.lagdate(mm, yy, average_period - 1, "yy") 'dating backwards to account for average period
sdate1 = syy & fnc.numtext(smm)
'start date for query (begining of lag value including average period)
Set MyRecordset = New ADODB.Recordset
MySql = sql.sqlVSers(mm, yy, qtable, qcode, sdate1)
MyRecordset.Open MySql, MyConnect, adOpenStatic, adLockReadOnly
Do Until MyRecordset.EOF 'Loop to end and enter required values
cur_value = cur_value + MyRecordset(qcode)
MyRecordset.MoveNext
Loop
cur_value = cur_value / average_period
MyRecordset.Close
'STEP-C: Calculates the Requested % Change or Point Value.
'===============================================================
If compare_period = 0 Then
ValueV = cur_value
Else
ValueV = cur_value / lag_value * 100 - 100
End If
End Function
Since I totally bypass the use of a subroutine, the connection to the database is currently done as a workbook helper routine as shown below.
Private Sub Workbook_AfterSave(ByVal Success As Boolean)
Dim filePath
filePath = ThisWorkbook.Path
If Right$(filePath, 1) <> "\" Then filePath = filePath & "\"
MyConnect = "Provider=Microsoft.ACE.OLEDB.12.0;" & _
"Data Source=" & filePath & "rsdata.accdb;"
End Sub
Problem is, this updating process is less than desirable. Idealy, I would like to position a custom button inside the menu bar that (upon clicking it) will connect to the database and recalculate all the userdefined functions that are used in a given worksheet or workbook.
Please offer your suggestions or point to where something like this may have been done before.
Thanks in advance. JR.
