This article provides a framework for a custom text import routine using
low-level file I/O to read files, string parsing, and DAO to store the data.
When importing delimited text files, the Jet Text ISAM driver truncates
leading spaces on fields not surrounded by quotes or other text qualifiers,
and truncates trailing spaces on all fields regardless of whether quotes
are used to qualify the data.
If you need leading and/or trailing spaces to be preserved or need to read
the data in a situation where Jet's Text ISAM driver cannot be used, you
will need a custom import routine.
The following code is a template you can use to build a custom import
WARNING: Your use or modification of the CODE provided in this article is
at your own risk. Microsoft provides this CODE "as is" without warranty of
any kind, either expressed or implied, including but not limited to the
implied warranties of merchantability and/or fitness for a particular
purpose. Microsoft does not support modifications of the CODE to suit
specific customer requirements.
- Using Notepad, create a text file with the following data:
1, Description 1 ,1,100.00,3/1/1998
2, Description 2 ,2,200.00,3/2/1998
- Save the file as c:\test.txt.
- In Visual Basic, create a new project and add a reference for Microsoft
DAO 3.5 Object Library. In Access, open the Northwind.MDB database.
- Create a new form with a CommandButton (Command1) and the following code:
Private Sub Command1_Click ()
Dim F As Long, sLine As String, A(0 To 4) As String
Dim db As Database, rs As Recordset
F = FreeFile
Open "c:\test.txt" For Input As F
' uncomment following line if you want to skip field headings
' Line Input #F, sLine
Set db = CurrentDb ' Access only
Set db = DBEngine(0).OpenDatabase("biblio.mdb") ' Visual Basic
On Error Resume Next
db.Execute "DROP TABLE TestImport"
On Error Goto 0
db.Execute "CREATE TABLE TestImport (ID LONG, [Desc] TEXT (50), " _
& "Qty LONG, Cost CURRENCY, OrdDate DATETIME)"
Set rs = db.OpenRecordset("TestImport", dbOpenTable)
Do While Not EOF(F)
Line Input #F, sLine
ParseToArray sLine, A()
rs(0) = Val(A(0))
rs(1) = A(1)
rs(2) = Val(A(2))
rs(3) = Val(A(3))
rs(4) = CDate(A(4))
Sub ParseToArray(sLine As String, A() As String)
Dim P As Long, LastPos As Long, I As Long
P = InStr(sLine, ",")
Do While P
A(I) = Mid$(sLine, LastPos + 1, P - LastPos - 1)
LastPos = P
I = I + 1
P = InStr(LastPos + 1, sLine, ",", vbBinaryCompare)
A(I) = Mid$(sLine, LastPos + 1)
- Run the project/form and click the CommandButton to import the data.
- Examine the contents of the TestImport table and note that the Desc
column has both leading and trailing spaces preserved and that other
fields have been correctly converted to the appropriate data type.
NOTE: In Visual Basic, you can use the VISDATA sample project to examine
the contents of the table.
Article ID: 183638 - Last Review: March 11, 2005 - Revision: 1.2
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