Monday, October 19, 2009

Macro to import text into Excel - more than 65,000 rows

Sub ImportLargeFileADO()
'Imports text file into Excel workbook using ADO.
'If the number of records exceeds 65536 then it splits it over more than one sheet.

Dim strFilePath As String, strFilename As String, strFullPath As String
Dim lngCounter As Long
Dim oConn As Object, oRS As Object, oFSObj As Object

'Get a text file name
strFullPath = Application.GetOpenFilename("Text Files (*.txt),*.txt", , "Please select text file...")

If strFullPath = "False" Then Exit Sub 'User pressed Cancel on the open file dialog

'This gives us a full path name e.g. C:\temp\folder\file.txt
'We need to split this into path and file name

strFilePath = oFSObj.GetFile(strFullPath).ParentFolder.path
strFilename = oFSObj.GetFile(strFullPath).Name

'Open an ADO connection to the folder specified
Set oConn = CreateObject("ADODB.CONNECTION")
oConn.Open "Provider=Microsoft.Jet.OLEDB.4.0;" & _
"Data Source=" & strFilePath & ";" & _
"Extended Properties=""text;HDR=Yes;FMT=Delimited"""

Set oRS = CreateObject("ADODB.RECORDSET")

'Now actually open the text file and import into Excel
oRS.Open "SELECT * FROM " & strFilename, oConn, 3, 1, 1
While Not oRS.EOF
ActiveSheet.Range("A1").CopyFromRecordset oRS, 65536


End Sub

Another Microsoft official macro

'All lines that begin with an apostrophe (') are remarks and are not
'required for the macro to run.
Sub LargeFileImport()

'Dimension Variables
Dim ResultStr As String
Dim FileName As String
Dim FileNum As Integer
Dim Counter As Double
'Ask User for File's Name
FileName = InputBox("Please enter the Text File's name, e.g. test.txt")
'Check for no entry
If FileName = "" Then End
'Get Next Available File Handle Number
FileNum = FreeFile()
'Open Text File For Input
Open FileName For Input As #FileNum
'Turn Screen Updating Off
Application.ScreenUpdating = False
'Create A New WorkBook With One Worksheet In It
Workbooks.Add template:=xlWorksheet
'Set The Counter to 1
Counter = 1
'Loop Until the End Of File Is Reached
Do While Seek(FileNum) <= LOF(FileNum)
'Display Importing Row Number On Status Bar
Application.StatusBar = "Importing Row " & _
Counter & " of text file " & FileName
'Store One Line Of Text From File To Variable
Line Input #FileNum, ResultStr
'Store Variable Data Into Active Cell
If Left(ResultStr, 1) = "=" Then
ActiveCell.Value = "'" & ResultStr
ActiveCell.Value = ResultStr
End If

'For xl97 and later change 16384 to 65536
If ActiveCell.Row = 16384 Then
'If On The Last Row Then Add A New Sheet
'If Not The Last Row Then Go One Cell Down
ActiveCell.Offset(1, 0).Select
End If
'Increment the Counter By 1
Counter = Counter + 1
'Start Again At Top Of 'Do While' Statement
'Close The Open Text File
'Remove Message From Status Bar
Application.StatusBar = False

End Sub