Import tables directly into Access from SAP using RFCs

Jimbo's picture

Access is an invaluable tool for data migration, transformation and manipulation. By calling a series of queries through a macro it is possible to automate all of the transformation steps and reduce the risk of corruption caused by manual processing.

One way to get the contents of a table is to export it to a text file and then import it into Access. This doesn't work so well and tends to be a cumbersome manual process comprised of several step each prone to error.

Pulling the data into Access using Remote Function Calls (RFCs) into the SAP system is very easy. It requires only a user account with appropriate permissions and the libraries that are installed along with the SAPGui client.

RFC calls from Access can be included in a Macro in the event that the data must be the most recent available. A good example is obsolescence determination that requires current data extracted from a legacy SAP system.

The RFC_READ_TABLE function accepts as parameters the name of the SAP table, the name of the table to be created (or replaced) in Access and a comma-delimited string containing the names of the fields to be extracted. In this example the fields MATNR, LVORM, MSTAE, MSTAV, ERSDA and MTART are pulled from the SAP MARA table into the Access tblMARA table.

Function ReadFromSAP() As Boolean
    Dim x
End Function

The system information and user credentials can be hard-coded into the function, but in the sample below they are passed in via the TempVars variables. This code uses a library that is installed as part of the SAPGui program and will not work without SAPGui installed.

Function RFC_READ_TABLE(strSAPTable As String, strTableName As String, strFields As String) As Boolean

    Dim strTemp As String
    'Create the database parallel to SAP's . . .
    Dim nCounter As Long, nCurrent As Long
    Dim dbs As dao.Database
    Set dbs = CurrentDb
    Dim tdf As dao.TableDef
    Dim fld1 As dao.Field
    Dim fld2 As dao.Field
    Dim fName As String
    Dim fType As Integer
    Dim fSize As Integer
    Dim nFieldData(999, 2) As Long
    Dim strRow As String
    Dim strFieldnames() As String
    Dim vField As Variant
    Dim j As Integer
    Dim rs As Recordset
    Dim SQL As String
    Dim nCurRec As Long, nCurSec As Long
    Dim isUpdate As Boolean
    Dim strFieldName As String
    Dim nRowCount As Long
    Dim nTotalRecords As Long

    Dim RetVal As Variant, nSecondsLeft As Long, nTotalSeconds As Long
    Dim R3, MyFunc, App As Object
    ' Define the objects to hold IMPORT parameters
    Dim QUERY_TABLE As Object
    Dim DELIMITER   As Object
    Dim NO_DATA     As Object
    Dim ROWSKIPS    As Object
    Dim ROWCOUNT    As Object
    ' Define the objects to hold the EXPORT parameters
    ' None for RFC_TABLE_READ

    ' Define the objects to hold the TABLES parameters
    ' Where clause
    Dim OPTIONS As Object
    ' Fill with fields to return.  After function call will hold
    ' detailed information about the columns of data (start position
    ' of each field, length, etc.
    Dim FIELDS  As Object
    ' Holds the data returned by the function
    Dim DATA    As Object
    ' Use to write out results
    Dim ROW As Object
    Dim Result As Boolean
    Dim iRow, iColumn, iStart, iStartRow, iField, iLength As Integer
    'Create Server object and Setup the connection
    Dim strSAP_System As String
    Dim strSAP_SystemNumber As String
    Dim strSAP_Client As String
    Dim strSAP_User As String
    Dim strSAP_Password As String
    Dim strSAP_Language As String
    Dim strSAP_ApplicationServer As String

    nTotalSeconds = 0

    Set R3 = CreateObject("SAP.Functions")
    R3.Connection.System = [TempVars]![SAP_System]
    R3.Connection.SystemNumber = [TempVars]![SAP_SystemNumber]
    R3.Connection.client = [TempVars]![SAP_Client]
    R3.Connection.User = [TempVars]![SAP_User]
    R3.Connection.Password = [TempVars]![SAP_Password]
    R3.Connection.language = "EN"
    R3.Connection.ApplicationServer = [TempVars]![SAP_ApplicationServer]
    RetVal = SysCmd(acSysCmdSetStatus, "Connecting to " & strSAP_System & " . . . ")

    If R3.Connection.logon(0, True) <> True Then
       If R3.Connection.logon(0, False) <> True Then
            Exit Function
       End If
    End If

    'Call RFC function RFC_READ_TABLE
    Set MyFunc = R3.Add("RFC_READ_TABLE")

    ' Set the Objects to the parameter they will return
    Set QUERY_TABLE = MyFunc.exports("QUERY_TABLE")
    Set DELIMITER = MyFunc.exports("DELIMITER")
    Set NO_DATA = MyFunc.exports("NO_DATA")
    Set ROWSKIPS = MyFunc.exports("ROWSKIPS")
    Set ROWCOUNT = MyFunc.exports("ROWCOUNT")

    Set OPTIONS = MyFunc.Tables("OPTIONS")
    Set FIELDS = MyFunc.Tables("FIELDS")

    QUERY_TABLE.Value = strSAPTable
    DELIMITER.Value = vbTab
    NO_DATA = ""
    j = 0
    strFieldnames = Split(strFields, ",")
    For Each vField In strFieldnames
        j = j + 1
        FIELDS.Value(j, "FIELDNAME") = vField
    RetVal = SysCmd(acSysCmdSetStatus, "Extracting " & j & " fields from table " & strSAPTable & " in " & strSAP_System & " . . . ")

    Result = MyFunc.CALL

    If Result = True Then
        Set DATA = MyFunc.Tables("DATA")
        Set FIELDS = MyFunc.Tables("FIELDS")
        Set OPTIONS = MyFunc.Tables("OPTIONS")
        MsgBox MyFunc.EXCEPTION
        Exit Function
    End If
    'Quit the SAP Application
    If Result <> True Then
      MsgBox (MyFunc.EXCEPTION)
      Exit Function
    End If

    nTotalColumns = FIELDS.ROWCOUNT
    'Check for existence of TargetTable
    nCounter = 0
    Do While nCounter < dbs.TableDefs.Count
        If dbs.TableDefs(nCounter).Name = strTableName Then
            'Delete TargetTable--must start from scratch
            dbs.TableDefs.Delete (strTableName)
        End If
        nCounter = nCounter + 1
    Set tdf = dbs.CreateTableDef(strTableName)
    For iField = 1 To FIELDS.ROWCOUNT
        fName = FIELDS(iField, "FIELDNAME")
        fType = dbText
        fSize = FIELDS(iField, "LENGTH")
        Set fld1 = tdf.CreateField(fName, fType, fSize)
        fld1.AllowZeroLength = True
        fld1.Required = False
        tdf.FIELDS.Append fld1
        nFieldData(iField, 1) = FIELDS(iField, "OFFSET")
        nFieldData(iField, 2) = FIELDS(iField, "LENGTH")
    'Create the table in the database
    dbs.TableDefs.Append tdf

    'Open the table in the Database
    Set rs = dbs.OpenRecordset(strTableName)
    'Display Contents of the table

    'Class this function up a little...
    RetVal = SysCmd(acSysCmdClearStatus)
    RetVal = SysCmd(acSysCmdInitMeter, "Importing " & strTableName & " from SAP...", DATA.ROWCOUNT)

    iField = 1
    For iField = 1 To nRowCount
        nFieldData(iField, 1) = FIELDS(iField, "OFFSET")
        nFieldData(iField, 2) = FIELDS(iField, "LENGTH")
    For iRow = 1 To DATA.ROWCOUNT
        nTotalRecords = nTotalRecords + 1
        If Second(Now()) <> nCurSec Then ' And nCurRec <> rs.RecordCount Then
            nCurSec = Second(Now())
            nTotalSeconds = nTotalSeconds + 1
            nSecondsLeft = Int(((nTotalSeconds / iRow) * DATA.ROWCOUNT) * ((DATA.ROWCOUNT - iRow) / DATA.ROWCOUNT))
            RetVal = SysCmd(acSysCmdRemoveMeter)
            RetVal = SysCmd(acSysCmdInitMeter, "Importing " & strTableName & " from SAP, " & nSecondsLeft & " seconds remaining. [" & nTotalRecords & " of " & DATA.ROWCOUNT & "]", DATA.ROWCOUNT)
            RetVal = SysCmd(acSysCmdUpdateMeter, iRow)
            RetVal = DoEvents()
        End If

    '   Add a new row to the DB
        strRow = DATA(iRow, 1) 'Pull this into a string rather than pull it from DATA each time...
        For iField = 1 To nRowCount
           rs.FIELDS(iField - 1).Value = Trim(Mid(strRow, nFieldData(iField, 1) + 1, nFieldData(iField, 2)))
    Close #2
    Set dbs = Nothing
    Set rs = Nothing
    RetVal = SysCmd(acSysCmdRemoveMeter)
End Function
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