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JustCode : Delete Empty columns of data

This mrs script shows you how you can use mrs files to make and run a dms file that will strip out any columns that do not have any data in.

Step 1: Open the VQ file and make an MDD FILE.

Dim mrDSCs, mrMdsc, oDoc,sVQ

sVQ = "C:\temp\FILE"
    Set mrMdsc = createobject("mrdscreg.components")
    Set mrMDSC = mrMdsc["mrScDsc"]

    Set oDoc = mrMdsc.Metadata.Open(sVQ + ".vq")
        oDoc.Save(sVQ + ".mdd")

Set oDoc = Null

Step 2: Take the MDD file and loop the variable instances

Dim oMDM, oVar
Dim sSQL,oConnection,oRecordset

' Create the MDM object
Set oMDM = CreateObject("MDM.Document")
    oMDM.Open("C:\temp\FILE.mdd", , 1)

    For Each oVar in oMDM.Variables
        'if oVar.IsSystem = False then
            debug.Log("Question Name : " + oVar.FullName)

            ' Start code to check if the field has data in it.
            Set oConnection = CreateObject("ADODB.Connection")
                oConnection.ConnectionString = "Provider=mrOleDB.Provider.2;Data Source=mrScDSC;Location=C:\temp\FILE.VQ;Initial Catalog=C:\temp\FILE.mdd"

            If ( oConnection.State = 1 ) Then
                Set oRecordset = CreateObject("ADODB.Recordset")
                    oRecordset.Open("SELECT count(respondent.serial) FROM VDATA WHERE " + oVar.FullName + " is not null" ,oConnection,3,1)
                    If ( oRecordset.EOF = true and oRecordset.BOF = true ) Then
                        sSQL = sSQL
                        sSQL = sSQL + oVar.FullName + ","
                    End if
                Set oRecordset = Null

            End If

            Set oConnection = Null
    ' end if

sSQL = Left(sSQL,len(sSQL)-1)

Step 3: Create the dms file with the select statement in it.

Dim oFSO, oFile

Set oFSO = CreateObject("Scripting.FileSystemObject")

Set oFile = oFSO.CreateTextFile("C:\temp\FILE.dms", True)

oFile.WriteLine("InputDatasource(Input, """")")
oFile.WriteLine("    ConnectionString = ""Provider=mrOleDB.Provider.2;Data Source=mrScDSC;Location=C:\temp\FILE.vq;Initial Catalog=C:\temp\FILE.mdd"" ")
oFile.WriteLine("    SelectQuery = ""SELECT " + sSQL + " FROM VDATA""")
oFile.WriteLine("End InputDatasource")
oFile.WriteLine("OutputDatasource(Output, """")")
oFile.WriteLine("    ConnectionString = ""Provider=mrOleDB.Provider.2;Data Source=mrSavDsc;Location=C:\temp\Final.sav""")
oFile.WriteLine("    MetaDataOutputName = ""C:\temp\Final.mdd""")
oFile.WriteLine("End OutputDatasource")


Set oFSO = Null

Step 4: Run the file

Dim oDMOMJob

Set oDMOMJob = CreateObject("DMOM.Job")

oDMOMJob.Load("C:\temp\FILE.dms", null)


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