Sub ExportChunks()
Dim rs As Recordset
Dim ssql As String
Dim maxnum As Long
Dim numChunks As Integer
Dim qdef As QueryDef
ssql = "SELECT COUNT(Id) FROM BigTable"
Set rs = CurrentDb.OpenRecordset(ssql)
maxnum = rs.Fields(0).Value 'total number of records
'add 0.5 so you always round up:
numChunks = Round((maxnum / 20000) + 0.5, 0)
On Error Resume Next 'don't break if Chunk_1 not yet in QueryDefs
ssql = "SELECT TOP 20000 * FROM BigTable"
CurrentDb.QueryDefs.Delete "Chunk"
Set qdef = New QueryDef
qdef.SQL = ssql
qdef.Name = "Chunk"
CurrentDb.QueryDefs.Append qdef
CurrentDb.QueryDefs.Refresh
DoCmd.TransferSpreadsheet acExport, acSpreadsheetTypeExcel12, "Chunk_1", "C:\00_Projekte_temp\Chunk_1.xlsx"
For i = 2 To numChunks
ssql = "SELECT TOP 20000 * FROM BigTable WHERE ID NOT IN (SELECT TOP " & (i - 1) * 20000 & " ID FROM BigTable)"
Set qdef = CurrentDb.QueryDefs("Chunk")
qdef.SQL = ssql
CurrentDb.QueryDefs.Refresh
Set qdef = CurrentDb.QueryDefs("Chunk_" & i)
DoCmd.TransferSpreadsheet acExport, acSpreadsheetTypeExcel12, qdef.Name, "C:\00_Projekte_temp\" & qdef.Name & ".xlsx"
Next i
End Sub
Select * From YourTable Where Id Mod 3 = 0
Select * From YourTable Where Id Mod 3 = 1
Select * From YourTable Where Id Mod 3 = 2
Option: Add virtual row number:
创建ans ave这样的查询:
SELECT RowCounter([ProductKey],False) AS Id, *
FROM YourTable
WHERE (RowCounter([ProductKey],False) <> RowCounter("",True));
使用下面的功能 . 然后调整三个查询以使用新查询 .
Public Function RowCounter( _
ByVal strKey As String, _
ByVal booReset As Boolean, _
Optional ByVal strGroupKey As String) _
As Long
' Builds consecutive RowIDs in select, append or create query
' with the possibility of automatic reset.
' Optionally a grouping key can be passed to reset the row count
' for every group key.
'
' Usage (typical select query):
' SELECT RowCounter(CStr([ID]),False) AS RowID, *
' FROM tblSomeTable
' WHERE (RowCounter(CStr([ID]),False) <> RowCounter("",True));
'
' Usage (with group key):
' SELECT RowCounter(CStr([ID]),False,CStr[GroupID])) AS RowID, *
' FROM tblSomeTable
' WHERE (RowCounter(CStr([ID]),False) <> RowCounter("",True));
'
' The Where statement resets the counter when the query is run
' and is needed for browsing a select query.
'
' Usage (typical append query, manual reset):
' 1. Reset counter manually:
' Call RowCounter(vbNullString, False)
' 2. Run query:
' INSERT INTO tblTemp ( RowID )
' SELECT RowCounter(CStr([ID]),False) AS RowID, *
' FROM tblSomeTable;
'
' Usage (typical append query, automatic reset):
' INSERT INTO tblTemp ( RowID )
' SELECT RowCounter(CStr([ID]),False) AS RowID, *
' FROM tblSomeTable
' WHERE (RowCounter("",True)=0);
'
' 2002-04-13. Cactus Data ApS. CPH
' 2002-09-09. Str() sometimes fails. Replaced with CStr().
' 2005-10-21. Str(col.Count + 1) reduced to col.Count + 1.
' 2008-02-27. Optional group parameter added.
' 2010-08-04. Corrected that group key missed first row in group.
Static col As New Collection
Static strGroup As String
On Error GoTo Err_RowCounter
If booReset = True Then
Set col = Nothing
ElseIf strGroup <> strGroupKey Then
Set col = Nothing
strGroup = strGroupKey
col.Add 1, strKey
Else
col.Add col.Count + 1, strKey
End If
RowCounter = col(strKey)
Exit_RowCounter:
Exit Function
Err_RowCounter:
Select Case Err
Case 457
' Key is present.
Resume Next
Case Else
' Some other error.
Resume Exit_RowCounter
End Select
End Function
3 回答
试试这个:
它有什么作用?首先,它计算您需要多少块,然后创建将占用前20,000条记录的查询,然后创建下一条等等,最后将每个分块查询导出到Excel文件 .
Edit: 修改为onyl创建一个在每次迭代中被覆盖并导出到新Excel文件的查询 .
由于您可能在表上有唯一的数字ID,请创建这三个查询并逐个导出:
Option: Add virtual row number:
创建ans ave这样的查询:
使用下面的功能 . 然后调整三个查询以使用新查询 .
如果您有一个标准,您可以分配数据,通过查询,查询集或参数化查询完成此分区,您可以使用查询的SQL属性和VBA
Replace()
函数替换代码 .如果没有条件,请在临时表中创建一个:
将表中的所有数据插入临时表,添加一个布尔字段
Exported
,默认值False
;创建查询
MyQuery
with a specific order (可能在主键上),以便您拥有一个包含您要使用的所有数据的对象:将
MyQuery
中的数据导出到Excel;将
MyQuery
中的记录设置为TRUE
:在
MyQuery
为空之前,然后删除TempTable
或它的内容 .