代码之家 › 专栏 › 技术社区 › bd528

将2行文本流写入一个访问记录

access-vba ms-access vba

0

bd528 · 技术社区 · 7 年前

我有以下代码,它读取文本文件并在找到值(n1)时写入访问表

    Do While Not objStream.AtEndOfStream
        strLine = objStream.ReadLine
        ReDim MyArray(0)
        MyArray = Split(strLine, ",")
        If MyArray(0)= "N1" Then
            rs.AddNew
            rs("Field1") = MyArray(0)
            rs("Field2") = MyArray(1)
            rs.Update
        End If
    Loop

在写入数据库之前,我想知道它是否可以检查textstream的下一行,以及是否找到n2值,然后将它写入记录

所以,如果我的示例文本文件数据是…

N1 Cat
N2 Cat
N1 Dog
N1 Fish
N2 Fish
N1 Hamster
N2 Hamster

…我的预期输出是:

Field 1 Field 2 Field 3 Field 4
N1      Cat     N2      Cat
N1      Dog
N1      Fish    N2      Fish
N1      Hamster N2      Hamster

我已查找textstream对象,找不到读取下一行的方法。

0 回复 | 直到 7 年前

1

AHeyne 7 年前

这应该是你需要的:

必要时,缓冲区用于存储预读取行。

'Definition of the buffer
Dim buffer As String
'Now also check if the buffer is filled
Do While (Not objStream.AtEndOfStream) Or (Len(buffer) > 0)
    'If the buffer is filled, use and clear it, instead read next line 
    If Len(buffer) > 0 Then
        strLine = buffer
        buffer = vbNullString
    Else
        strLine = objStream.ReadLine
    End If
    ReDim MyArray(0)
    MyArray = Split(strLine, ",")
    If MyArray(0)= "N1" Then
        rs.AddNew
        rs("Field1") = MyArray(0)
        rs("Field2") = MyArray(1)
        'Read a line to the buffer and check if it starts with 'N2'
        buffer = objStream.ReadLine
        If buffer Like "N2*" Then
            'Use the content of the buffer, store it in Field3 and 4, and clear it
            MyArray = Split(buffer, ",")
            buffer = vbNullString
            rs("Field3") = MyArray(0)
            rs("Field4") = MyArray(1)
        End If
        rs.Update
    End If
Loop

2

0

Nathan_Sav 7 年前

你可以试试这样的方法,不知道这是不是最好的方法。

Sub c()

Dim f As Scripting.FileSystemObject
Dim t As Scripting.TextStream
Dim a() As String
Dim n1() As String
Dim n2() As String
Dim l As Long
Dim rs As Object

Set f = New Scripting.FileSystemObject
Set t = f.OpenTextFile("C:\Workspace\Dummy Data\dummy.txt", ForReading)

a = Split(t.ReadAll, vbCrLf)

t.Close

For l = 0 To UBound(a)

    n1 = Split(a(l), " ")

    If n1(0) = "N1" Then

        rs.addnew
        rs("Field1") = n1(0)
        rs("Field2") = n1(1)

        If l + 1 < UBound(a) Then
            n2 = Split(a(l + 1), " ")
            If n2(0) = "N2" Then
                rs("Field3") = n2(0)
                rs("Field4") = n2(1)
            End If
            l = l + 1
        End If

        rs.Update
        Erase n1
        Erase n2

    End If

Next l

erase a


End Sub