如何在VB6中读取xBase/Clipper文件中的数据？

Question

C:\dbase\clip53\PRG\stkmenu\WPACK3\

• DBF文件中的
• DBF文件称为WPACKS.CFG (故意不使用.DBF)

用于打开数据库和记录集的VB6 EXE中的ActiveX代码：

Function OpenDatabase(sFile As Variant, Optional sProvider As Variant = "Provider=Microsoft.Jet.OLEDB.4.0") As Variant  ' ADODB.Connection
    Dim nErr As Long
    Dim sErr As String
    Dim oConnection As Object 'ADODB.Connection
    Set oConnection = CreateObject("ADODB.Connection")
    On Error Resume Next
    oConnection.open sProvider & ";Data Source=" & sFile
    nErr = Err.Number
    sErr = Err.Description
    On Error GoTo 0
    If nErr <> 0 Then
        Err.Raise OPENDATABASE_E_NOTFOUND, , sErr
    End If
    Set OpenDatabase = oConnection
End Function

Function OpenRecordSet(ByRef oDb As Variant, sQuery As Variant, Optional bCmdText As Boolean = False) As Variant ''ADODB.Connection ADODB.Recordset
    Const adOpenForwardOnly  As Long = 0
    Const adOpenStatic As Long = 3
    Const adOpenDynamic As Long = 2
    Const adOpenKeyset As Long = 1
    Const adLockOptimistic As Long = 3
    Const adCmdText As Long = 1
    Dim oRecordSet As Object 'ADODB.Recordset
    Set oRecordSet = CreateObject("ADODB.RecordSet")
    If bCmdText Then
        oRecordSet.open sQuery, , , adCmdText
    Else
        oRecordSet.open sQuery, oDb, adOpenKeyset, adLockOptimistic
    End If
    Set OpenRecordSet = oRecordSet
End Function

访问这些方法的脚本看起来有点像VBScript。它是VBScript，但由前面提到的ActiveX EXE执行，该EXE使用MSScript控件，拥有一堆对象，可以将其提供给脚本引擎。一种VBScript在类固醇上的方法。

uses database
uses system
dim db
dim rs
set db = database.opendatabase("C:\dbase\clip53\PRG\stkmenu\WPACK3\","Provider=Microsoft.Jet.OLEDB.4.0;Extended Properties=dBase III;User ID=Admin;Password=")
set rs = database.openrecordset(db, "SELECT * FROM WPACKS.CFG",true)
system.consolewriteline rs.recordcount

我的问题是，当The connection cannot be used to perform this operation. It is either closed or invalid in this context.访问oRecordSet.open sQuery, , , adCmdText (我从微软网站获得的)时，我一直得到它。

有点烦人。

Answer 1

我在需要连接DBF文件时使用的连接字符串通常如下所示：

"Driver={Microsoft dBase Driver (*.dbf)};dbq=<filePath>"

对我来说很好。

Answer 2

尝试使用最新的和最伟大的FoxPro驱动程序。