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Dicas
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Visual Basic (Banco de Dados)
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Título da Dica: Criando backup de bancos de dados
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Postada em 28/10/2003 por ^HEAVY-METAL^
Function BackupDataBase (filename$) As Integer
'****************************************************************
' ******************
'* PROCEDURE: BackupDataBase
'* ARGS: filename$ -- Name of New DataBase, defaults To current D
On Error GoTo BackupDataBase_Err
Dim newDB As Database, oldDB As Database, oldTable As TableDef
Dim tempname As String, path As String, intIndex As Integer, numTables As Integer
Dim intIndex2 As Integer, errorFlag As Integer
'backup defaults To current directory,...
path = GetApplicationDir() & filename$
'replace above Line With this one To pass a full path To this fun
' ction
'path = filename$
'If database already exists, delete it.
If MB_FileExists(path) Then
Kill path
End If
'create New file
Set newDB = DBEngine.workspaces(0).CreateDatabase(path, DB_LANG_GENERAL)
newDB.Close
Set oldDB = DBEngine(0)(0)
'Get number of tables And their names
numTables = oldDB.tabledefs.count - 1
'Actually export all the tables In the list.
For intIndex = 0 To numTables
tempname = oldDB.tabledefs(intIndex).name
If ValidTableFilter(tempname) Then
DoCmd TransferDatabase A_EXPORT, "Microsoft Access", path, A_TABLE, tempname, tempname
End If
Next intIndex
BackupDataBase = True
BackupDataBase_Exit:
If errorFlag Then
BackupDataBase = False
'If we errored out, Then destroy the backup, (less risk of using
' incorrect file).
If MB_FileExists(path) Then
Kill path
End If
Else
BackupDataBase = True
End If
Exit Function
BackupDataBase_Err:
MsgBox "Backup Failed! Error: " & Error$, 16, "FUNCTION: BackupDataBase( " & filename$ & " )"
errorFlag = True
Resume BackupDataBase_Exit
End Function
Function GetApplicationDir () As String
'****************************************************************
' ***********
'* PROCEDURE: GetApplicationDir
'* ARGS: NONE
'* RETURNS:App's dir
'* CREATED:8/2/95 GDK
'* REVISED:
'* CommentsRetrieves App's directory, (actually the current MDB's
' dir.)
'****************************************************************
' ***********
Dim d As Database, path As String, i%
Set d = DBEngine(0)(0)
path = d.name
d.Close
For i% = Len(path) To 0 Step -1
If Mid$(path, i%, 1) = "\" Then
path = Left$(path, i%)
Exit For
End If
Next i%
GetApplicationDir = path
End Function
'*************************************************************
'* FUNCTION: MB_FileExists
'* ARGUMENTS: strFilename-- Name of file To look For
'* RETURNS:TRUE/False -- True = File Exists
'* CREATED:8/95 GDK Initial Code
'* CHANGED:N/A
'*************************************************************
Function MB_FileExists (strFileName As String) As Integer
'
'Check To see If file strFileName exists
'
If Len(Dir$(strFileName)) Then
MB_FileExists = True
End If
End Function
'***************************************************************
'* FUNCTION: ValidTableFilter
'* ARGUMENTS: tablename$ -- table To OK For export
'* RETURNS:TRUE/False -- True = OK To export
'* PURPOSE:Screen out invalid tables by testing them here.
'* CREATED:2/97 GDK Initial code
'* CHANGES:N/A
'***************************************************************
Function ValidTableFilter (tablename$) As Integer
On Error GoTo ValidTableFilter_Error:
If Left$(tablename$, 4) = "MSys" Then
Exit Function
End If
If tablename$ = "" Then
Exit Function
End If
'Add test functions above this line.
ValidTableFilter = True
ValidTableFilter_Exit:
Exit Function
ValidTableFilter_Error:
MsgBox Error, 16, "FUNCTION: ValidTableFilter( " & tablen
End Function
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