Примеры методов Делетерекорд и MoveRecord (Visual Basic)DeleteRecord and MoveRecord Methods Example (VB)

В этом примере показано, как копировать, перемещать, изменять и удалять содержимое текстового файла, опубликованного в веб-папке.This example demonstrates how to copy, move, edit, and delete the contents of a text file published to a Web folder. Другие используемые свойства и методы включают дочерние элементы, парентурл, источники запись на диск.Other properties and methods used include GetChildren, ParentURL, Source, and Flush.

'BeginDeleteRecordVB  
  
'Note:  
' IIS must be running for this sample to work. To  
' use this sample you must:  
'  
' 1. create folders named "test" and "test2"  
'    in the root web folder of https://MyServer  
'  
' 2. Create a text file named "test2.txt" in the  
'    "test" folder.  
' 3. Replace "MyServer" with the appropriate web  
'    server name.  
  
Public Sub Main()  
    On Error GoTo ErrorHandler  
  
     ' connection and recordset variables  
    Dim rsDestFolder As ADODB.Recordset  
    Dim Cnxn As ADODB.Connection  
    Dim strCnxn As String  
  
     ' file as record variables  
    Dim rcFile As ADODB.Record  
    Dim rcDestFile As ADODB.Record  
    Dim rcDestFolder As ADODB.Record  
    Dim objStream As Stream  
  
     ' file variables  
    Dim strFile As String  
    Dim strDestFile As String  
    Dim strDestFolder As String  
  
     ' instantiate variables  
    Set rsDestFolder = New ADODB.Recordset  
    Set rcDestFolder = New ADODB.Record  
    Set rcFile = New ADODB.Record  
    Set rcDestFile = New ADODB.Record  
    Set objStream = New ADODB.Stream  
  
     ' open a record on a text file  
    Set Cnxn = New ADODB.Connection  
    strCnxn = "url=https://MyServer/"  
    Cnxn.Open strCnxn  
    strFile = "test/test2.txt"  
    rcFile.Open strFile, Cnxn, adModeReadWrite, adOpenIfExists Or adCreateNonCollection  
    Debug.Print Cnxn  
  
     ' edit the contents of the text file  
    objStream.Open rcFile, , adOpenStreamFromRecord  
  
    Debug.Print "Source: " & strCnxn & rcFile.Source  
    Debug.Print "Original text: " & objStream.ReadText  
  
    objStream.Position = 0  
    objStream.WriteText "Newer Text. "  
    objStream.Position = 0  
  
    Debug.Print "New text: " & objStream.ReadText  
  
     ' reset the stream object  
    objStream.Flush  
    objStream.Close  
    rcFile.Close  
  
     ' reopen record to see new contents of text file  
    rcFile.Open strFile, Cnxn, adModeReadWrite, adOpenIfExists Or adCreateNonCollection  
    objStream.Open rcFile, adModeReadWrite, adOpenStreamFromRecord  
  
    Debug.Print "Source: " & strCnxn & rcFile.Source  
    Debug.Print "Edited text: " & objStream.ReadText  
  
     ' copy the file to another folder  
    strDestFile = "test2/test1.txt"  
    rcFile.CopyRecord "", "https://MyServer/" & strDestFile, "", "", adCopyOverWrite  
  
     ' delete the original file  
    rcFile.DeleteRecord  
  
     ' move the file from the subfolder back to original location  
    strDestFolder = "test2/"  
    rcDestFolder.Open strDestFolder, Cnxn ', adOpenIfExists  'Or adCreateCollection  
    Set rsDestFolder = rcDestFolder.GetChildren  
    rsDestFolder.MoveFirst  
  
     ' position current record at on the correct file  
    Do While Not (rsDestFolder.EOF Or rsDestFolder(0) = "test1.txt")  
        rsDestFolder.MoveNext  
    Loop  
  
     ' open a record on the correct row of the recordset  
    rcDestFile.Open rsDestFolder, Cnxn  
  
     ' do the move  
    rcDestFile.MoveRecord "", "https://MyServer/" & strFile, "", "", adMoveOverWrite  
  
    ' clean up  
    rsDestFolder.Close  
    Cnxn.Close  
    Set rsDestFolder = Nothing  
    Set Cnxn = Nothing  
    Exit Sub  
  
ErrorHandler:  
    ' clean up  
    If Not rsDestFolder Is Nothing Then  
        If rsDestFolder.State = adStateOpen Then rsDestFolder.Close  
    End If  
    Set rsDestFolder = Nothing  
  
    If Not Cnxn Is Nothing Then  
        If Cnxn.State = adStateOpen Then Cnxn.Close  
    End If  
    Set Cnxn = Nothing  
  
    If Err <> 0 Then  
        MsgBox Err.Source & "-->" & Err.Description, , "Error"  
    End If  
End Sub  
'EndDeleteRecordVB  

См. такжеSee Also

Метод Делетерекорд (ADO) DeleteRecord Method (ADO)
Метод Flush (ADO) Flush Method (ADO)
Метод дочернего элемента (ADO) GetChildren Method (ADO)
Метод MoveRecord (ADO) MoveRecord Method (ADO)
Свойство Парентурл (ADO) ParentURL Property (ADO)
Свойство Source (объект Record ADO)Source Property (ADO Record)