The source code in this issue is designed for Visual Basic 5.0 and higher. With some modifications to the parameters it can be used in VB 3 and 4.
This issue shows how to attach an external table to an Access database. This is useful for situations where you need to access tables in other Access databases or other database formats. We will show an example of how to attach a dBASE III type table. Doing the attachment allows you to access data using a query across multiple databases and database types.
Function AttachTable(DestDB As String, SrcDB As String, sTable As String, Optional sDBType as String) As Integer
None unless an error occurs. If an error occurs it will be raised to the caller. Some situations that this subroutine will fail are:
The below example uses the AttachTable to attach an Access table and a dBASE table. It is assumed that the dBASE tables are located in the directory C:\DATA
On Error Resume Next ' Attach the OLDSALES.DBF table in the C:\DATA directory to C:\DATA\SALES.MDB AttachTable "C:\DATA\SALES.MDB", "C:\DATA", "OLDSALES", "dBASE III" If Err <> 0 Then MsgBox "Error: " & Err.Description End If ' Attach the Invoices table to REPORT.MDB from SALES.MDB AttachTable "C:\DATA\REPORT.MDB", "C:\DATA\SALES.MDB", "Invoices" If Err <> 0 Then MsgBox "Error: " & Err.Description End If ' Attach the Customer table to REPORT.MDB from SALES.MDB AttachTable "C:\DATA\REPORT.MDB", "C:\DATA\SALES.MDB", "Customers" If Err <> 0 Then MsgBox "Error: " & Err.Description End If
Just paste this code into any module (this is the desired way) or form. To do this, open up your project and insert a new Module. Change the name of the module to basDatabase and paste this code into the module.
'---------------------------------------------------------------------- ' ' Module Name: basDatabase ' Written By: C&D Programming Corp. ' Create Date: 1/7/98 ' Copyright: Copyright 1997-98 by C&D Programming Corp. Source ' code may not be reproduced except for use in a ' compiled executable. All rights reserved. If ' you would like to reprint any or all of this ' code please email us at email@example.com ' ' Purpose: Determine the decimal equivalent of a fraction ' or whole number. ' ' '---------------------------------------------------------------------- ' ' sDBType can be any database type, such as dBASE III ' if you want to attach an Access Table, just ' leave sDBType blank. ' Function AttachTable(DestDB As String, SrcDB As String, sTable As String, Optional sDBType As String) As Integer Dim dbJet As Database Dim tdfAttachedTable As New TableDef Dim X As Integer On Error GoTo Handler ' Open Database Set dbJet = OpenDatabase(DestDB) ' Make sure link does not already exist. If it does, ' this routine will delete it. Make sure that you ' are not attaching a table that already exists. For X = 0 To dbJet.TableDefs.Count - 1 If dbJet.TableDefs(X).Name = sTable Then dbJet.TableDefs.Delete sTable Exit For End If Next ' Set connection information. tdfAttachedTable.SourceTableName = sTable tdfAttachedTable.Connect = sDBType & ";DATABASE=" & SrcDB tdfAttachedTable.Name = sTable ' Append TableDef object to create link. dbJet.TableDefs.Append tdfAttachedTable dbJet.Close Exit Function Handler: Err.Raise Err.Number, "AttachTable", Err.Description End Function
That concludes this issue of COTW. We hope you find the source code useful in your development.
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