excel - 导入excel文件对现有数据返回null

Question

我正在尝试将 Excel 文件 Excel97-2003(仅限第一张工作表)导入 Access 数据库。为此，我正在使用以下代码:

Dim cnnExcel As New ADODB.Connection
Dim rsExcel As New ADODB.Recordset
With cnnExcel
    .Provider = "Microsoft.Jet.OLEDB.4.0"
    .ConnectionString = "Data Source=" & strFileSelected & ";" & "Extended Properties=Excel 8.0"
    .CursorLocation = adUseClient
    .Open
End With

rsExcel.Open "SELECT * FROM [Sheet1]", cnnExcel

excel文件中的所有列都是字符串，当你用Excel2003打开它时，类型为“General”(没有特殊格式)，其他3列是日期。
我的问题是单元格中存在的值为空。例如，如果第一个值是字符串，而不是该列中有整数，则它将返回为空，反之亦然
有什么解决办法吗？

谢谢

Answer 1

解决方案一

使用您的代码，我能够毫无问题地从 Excel 工作表中正确加载数据。
但是，请检查您的 SQL 查询，它应该类似于:

rsExcel.Open "SELECT * FROM [Sheet 1$]", cnnExcel

FROM 的规则部分如下:

查询整个工作表:SELECT * FROM [SheetName$] ，请注意 $

从范围查询:SELECT * FROM [SheetName$A1:C5]

从命名范围查询:SELECT * FROM NameRange

从具有非字母数字字符的工作表中查询:SELECT * FROM ['This;is.My SheetName$']

在我的机器上工作的代码:

Dim cnnExcel As Object
Dim rsExcel As Object
Set cnnExcel = CreateObject("ADODB.Connection")
Set rsExcel = CreateObject("ADODB.RecordSet")
With cnnExcel
    .Provider = "Microsoft.Jet.OLEDB.4.0"
    .ConnectionString = "Data Source=D:\Query1.xls;Extended Properties=Excel 8.0"
    .CursorLocation = 3
    .Open
End With

rsExcel.Open "SELECT * FROM [Sheet 1$]", cnnExcel
Debug.Print rsExcel.RecordCount '  Prints the number of rows containing data '
Do
    Debug.Print "Col1: " & rsExcel.Fields(0) & "  - Col2: " & rsExcel.Fields(1)
    rsExcel.MoveNext
Loop While Not rsExcel.EOF
rsExcel.Close

解决方案二

直接操作 Excel 工作簿可能会更好。
假设您有一张表 MyTable在要导入的 Access 数据库中的 myA 字段中, myB和 myC (具有您期望的正确数据类型!) Excel 的内容 Sheet 1有相应的列。

简化的 VBA 代码如下所示:

Sub ImportData(fname As String)
    Dim xlo As Object
    Dim xlWb As Object
    Dim xlWs As Object
    Dim colA, colB, ColC As Variant
    Dim db As DAO.Database
    Dim rs As DAO.Recordset
    Dim thereIsData As Boolean
    Dim row As Integer

    ' Open Excel sheet, try to re-use Excel if it is open '
    On Error Resume Next
    Set xlo = GetObject("Excel.Application")
    If xlo Is Nothing Then Set xlo = CreateObject("Excel.Application")
    On Error Goto 0
    Set xlWb = xla.Workbooks.Open(fname)
    Set xlWs = xlWb.Worksheets(1)  ' Sheet 1'

    ' Open table where the results will be stored '
    Set db = CurrentDb()
    Set rs = db.OpenRecordset("MyTable", dbOpenDynaset)
    Do
       colA = xlWs.Cells(row, 1).Value
       colB = xlWs.Cells(row, 2).Value
       colC = xlWs.Cells(row, 3).Value
       ' We will stop at the first empty row '
       thereIsData = Not (IsBlank(colA) And IsBlank(colB) And IsBlank(colC))
       If thereIsData Then
            ' Add the Excel data to the table '
            rs.AddNew
                rs!myA = colA
                rs!myA = colB
                rs!myA = colC
            rs.Update
       End If
       row = row + 1
    Loop While thereIsData
    rs.Close
    ' Cleanup '
    Set rs = Nothing
    Set db = Nothing
    Set xlWs = Nothing
    Set xlWb = Nothing
    xla.DisplayAlerts = False
    xla.Quit
    Set xls = Nothing
End Sub

'-----------------------------------------------------------------------------  
' True if the argument is Nothing, Null, Empty, Missing or an empty string .  
'-----------------------------------------------------------------------------  
Public Function IsBlank(arg As Variant) As Boolean  
    Select Case VarType(arg)  
        Case vbEmpty  
            IsBlank = True  
        Case vbNull  
            IsBlank = True  
        Case vbString  
            IsBlank = (arg = vbNullString)  
        Case vbObject  
            IsBlank = (arg Is Nothing)  
        Case Else  
            IsBlank = IsMissing(arg)  
    End Select  
End Function