VBA DAO.OpenRecordSet 不一致的错误

Question

运行访问 2016

我正在尝试从 Excel 的 MS Access .mdb 表中导入数据。 （我的客户端使用的专有软件只能识别 *.mdb 文件。）当我在表关闭时运行此代码时，我收到错误：

Run-Time Error 3061
Too few parameters - Expected 2

如果我在 Access 中打开表时运行代码，一半的时间，我得到那个错误和一半的时间：

Run-Time error '3008'
The table 'Daily_Logs_of_Flows' is already opened exclusively by 
another user, or it is already open through the user interface 
and cannot be manipulated programmatically.

这似乎表明 VBA 有时会通过第一个错误。

由于this post on StackOverflow，我检查了变量名称，并在monthToImport 前后使用了单引号和数字符号(#)。错误来自

Expected 3 

到

Expected 2

这里是代码

Sub importPLCDataFromAccess(monthToImport As Date)

Dim myDbLocation As String
myDbLocation = "K:\Users\WWTP Computer\Documents\POV_Projects\PLC Interface\PLC_Data.mdb"

DIM mySQLCall as String

Set myWorkbook = ActiveWorkbook
Set myDataSheet = myWorkbook.Worksheets("Page 1")

Set myEngine = New DAO.DBEngine
'Set myWorkspace = myEngine.Workspaces(0)
Set myDB = myEngine.OpenDatabase(myDbLocation)
' I deleted the workspace
' Set myDB = myWorkspace.OpenDatabase(myDbLocation)

mySQLCall = "SELECT Time_Stamp, GolfVolume, CreekVolume, InfluentVolume FROM Daily_Logs_of_Flows "
' Limit records to month requested...
mySQLCall = mySQLCall & "WHERE (DATEPART(m,Time_Stamp) = DATEPART(m,#" & monthToImport & "#)) "
'  ... during the year requested
mySQLCall = mySQLCall & "AND (DATEPART(yyyy,Time_Stamp) = DATEPART(yyyy,#" & monthToImport & "#)) "
mySQLCall = mySQLCall & "ORDER BY Time_Stamp"

Debug.Print "mySQLCall = " & mySQLCall
Debug.Print "monthToImport: " & monthToImport

'Error occurs on next line where execute query & populate the recordset

Set myRecordSet = myDB.OpenRecordset(mySQLCall, dbOpenSnapshot)

'Copy recordset to spreadsheet
Application.StatusBar = "Writing to spreadsheet..."
Debug.Print "RecordSet Count = " & myRecordSet.recordCount

If myRecordSet.recordCount = 0 Then
    MsgBox "No data retrieved from database", vbInformation + vbOKOnly, "No Data"
    GoTo SubExit
End If
'....
End Sub  

这是当前读取的 SQL 语句的 Debug.Print：

mySQLCall = SELECT Time_Stamp, GolfVolume, CreekVolume, InfluentVolume FROM Daily_Logs_of_Flows WHERE (DATEPART(m,Time_Stamp) = DATEPART(m,#6/1/2016#)) AND (DATEPART(yyyy,Time_Stamp) = DATEPART(yyyy,#6/1/2016#)) ORDER BY Time_Stamp

对我在这里缺少什么有什么想法吗？提前感谢您的帮助。

Answer 1

问题是 DATEPART 函数需要第一个参数用引号引起来，否则它会查找字段yyyy 或m。

例如：

DATEPART("yyyy", #6/1/2016#)

或

DATEPART("m", #6/1/2016#)

总共：

SELECT Time_Stamp, GolfVolume, CreekVolume, InfluentVolume _
FROM Daily_Logs_of_Flows 
WHERE (DATEPART("m",Time_Stamp) = DATEPART("m",#6/1/2016#)) 
      AND (DATEPART("yyyy",Time_Stamp) = DATEPART("yyyy",#6/1/2016#)) 
ORDER BY Time_Stamp

要在 VBA 中执行此操作（如果您不知道，但我猜您知道），只需在每次调用 DATEPART 函数时将引号加倍...

例如：

mySQLCall = mySQLCall & "AND (DATEPART(""yyyy"",Time_Stamp)...."

为了完整起见，运行时错误“3008”实际上是第一个错误......Access 不会尝试运行任何 SQL，直到它可以确定它具有适当的权限。