是否可以使用 VBA 在不同的 Access 文件中“同步”两个表？
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Is it possible to "sync" two tables in different Access files using VBA?
提问by ome
I created an Access database which I want to distribute to a small group. While I can always export the tables in excel and merge them/append data there, is there a way to sync the databases, maybe by using VBA?
我创建了一个 Access 数据库，我想将其分发给一个小组。虽然我总是可以在 excel 中导出表并在那里合并它们/附加数据，但有没有办法同步数据库，也许是使用 VBA？
To expound further, in one form in the database application, a sync button may exist, and onclick, a dialog box may open to look for the accdb to sync with. What ensues is that the VBA will "sync" the table (which of course is of the same structure) in question between the two accdbs.
进一步说明，在数据库应用程序的一种形式中，可能存在一个同步按钮，单击时，可能会打开一个对话框以查找要与之同步的accdb。随之而来的是 VBA 将在两个 accdbs 之间“同步”有问题的表（当然它具有相同的结构）。
Is this possible? Insights will be good. Thank you!
这可能吗？洞察力会很好。谢谢！
回答by Fionnuala
Yes, it is perfectly possible. Here are some notes on comparing two DBs and logging changes.
是的，这是完全可能的。以下是有关比较两个 DB 和日志记录更改的一些注意事项。
The procedure requires the following at the top of the module:
该过程需要模块顶部的以下内容：
Dim strFileNew As String
Dim strFileOld As String
Dim strLog As String
Dim dbOld As Database
The variables might contain:
变量可能包含：
strLog = "log.txt"
strFileNew = "z:\docs\dbNew.mdb"
strFileOld = "z:\docs\dbOld.mdb"
Set dbOld = OpenDatabase(strFileOld)
Then the comparison:
然后对比：
Sub LogCompareDB(db As Database)
''References : Windows Script Host Object Model
'' This is set by default for a number of versions
'' : Microsoft DAO x.x Object Library
'' For 2010, the DAO library is called
'' :Microsoft Office 12.0 Access Database Engine Object Library
Dim tdf As TableDef
Dim rs0 As DAO.Recordset
Dim rs1 As DAO.Recordset
Dim fld As DAO.Field
Dim idx As Index
Dim idxPrimary As Index
Dim strIndexList As String
Dim strIndex As String
Dim strID As String
Dim strSQL As String
Dim strChanged As String
Dim blnNew As Boolean
Dim fs As New FileSystemObject
Dim ts As TextStream
Set ts = fs.CreateTextFile(strLog, True)
''For each table in the old database
''(It would probably be a good idea to check the
''new database for added tables)
For Each tdf In db.TableDefs
'' Skip system tables
If Left(tdf.Name, 4) <> "MSys" Then
strIndex = vbNullString
Set idxPrimary = Nothing
strIndexList = vbNullString
''Get the primary index and index fields
For Each idx In tdf.Indexes
If idx.Primary = True Then
Set idxPrimary = idx
For Each fld In idx.Fields
strIndex = strIndex & " AND t0.[" & fld.Name _
& "] = t1.[" & fld.Name & "]"
strIndexList = strIndexList & "," & fld.Name
Next
strIndex = Mid(strIndex, 5)
End If
Next
''There is no basis for comparison if there is no index.
''A unique index would also be a possibility, but hey, let's
''not go over the top :)
If strIndex > vbNullString Then
''Select all records from the table for both databases
strSQL = "SELECT * FROM [;DATABASE=" & strFileNew & "].[" _
& tdf.Name & "] As t0 LEFT JOIN [" _
& tdf.Name & "] As t1 ON " & strIndex
Set rs0 = db.OpenRecordset(strSQL)
''A convenient list of fields from the old database
''It would probably be a good idea to check the
''new database for added fields.
strSQL = "SELECT * FROM [;DATABASE=" & strFileOld & "].[" _
& tdf.Name & "] As t0 WHERE 1=2"
Set rs1 = db.OpenRecordset(strSQL)
Do While Not rs0.EOF
strID = vbNullString
blnNew = False
''If the index fields are null, then it is a new record
For Each fld In idxPrimary.Fields
strID = strID & fld.Name & ": " & rs0("[t0." & fld.Name & "]") & vbCrLf
If IsNull(rs0("[t1." & fld.Name & "]")) Then
blnNew = True
End If
Next
If blnNew Then
''Write to log
ts.WriteLine "NEW RECORD " & strID & vbCrLf
Else
''Not a new record, so is it a changed record?
strChanged = vbNullString
For Each fld In rs1.Fields
''No need to check index fields, because they are equal
If InStr(strIndexList, fld.Name) = 0 Then
''Add null string for purposes of comparison ''trailing
If "" & rs0("[t0." & fld.Name & "]") <> "" & rs0("[t1." & fld.Name & "]") Then
strChanged = strChanged & vbCrLf _
& fld.Name & " Is: " & Trim(rs0("[t0." & fld.Name & "]")) _
& " Was: " & Trim(rs0("[t1." & fld.Name & "]"))
End If
End If
Next
If strChanged <> vbNullString Then
''Write to log
ts.WriteLine "CHANGED RECORD " & strID
ts.WriteLine strChanged & vbCrLf
End If
End If
rs0.MoveNext
Loop
Else
ts.WriteLine "NO PRIMARY INDEX " & tdf.Name & vbCrLf
End If
End If
Next
ts.Close
FollowHyperlink strLog
End Sub
回答by SAA
Option Compare Database
Private Sub Command4_Click()
Dim tablename1, tablename2 As String
tablename1 = Text0.Value
tablename2 = Text2.Value
'On Error GoTo Err_cmdValidateGeneralInfo_Click
Dim F As DAO.Field
Dim rs As DAO.Recordset
Dim rs1 As DAO.Recordset
Set curDB = CurrentDb()
'If Me.DateModified = Date Then
'Adds new employees to the TT_GeneralInfo table in the FTEI_PhoneBook.mdb - which is used thru out the AP databases.
' DoCmd.OpenQuery "qryEmpData_TT_General"
strsql = "Select * from " & tablename1
Set rs = curDB.OpenRecordset(strsql)
strsql1 = "Select * from " & tablename2
DoCmd.CopyObject , "Unmatched_records", acTable, tablename1
curDB.Execute "DELETE FROM Unmatched_records"
Set rs1 = curDB.OpenRecordset(strsql1)
Do Until rs.EOF
For Each F In rs.Fields
If rs.Fields(F.Name) <> rs1.Fields(F.Name) Then
'rs.Edit
strsql = "Select * into test from " & tablename1 & " where " & F.Name & " = """ & rs.Fields(F.Name) & """"
DoCmd.RunSQL strsql
If DCount(F.Name, "test") <> 0 Then
GoTo append_unmatch
'appending unmacthed records
append_unmatch:
strsql2 = "insert into Unmatched_records Select * from test"
DoCmd.RunSQL strsql2
'if record doesnt match move to next one
GoTo Nextrecord
End If
' rs.Fields(F.Name) = rs1.Fields(F.Name)
' rs.Update
End If
Next F
Nextrecord:
rs.MoveNext
rs1.MoveNext
Loop
If DCount("test", F.Name) <> 0 Then
MsgBox ("The two tables didnt match. Check table test for unmatching reocrds.")
Else
MsgBox ("Tables match!")
End If
End Sub
