当执行插入时访问运行时错误3073

Question

这是我的设想。我有一个Access 2010数据库分成前端和后端，使用VBA代码处理我的数据。直到上个星期，当我做每月的批量插入时，我没有任何问题。插入是通过将csv文件作为Excel电子表格读取并将数据插入访问表(并不是所有的数据都将被插入，因此每一行必须单独处理)来完成的。当我周五运行时，我突然开始随机获取3073个错误(操作必须使用可更新的查询)。它可以发生在数据库中的任何一个表上。

我在错误处理程序中使用debug和设置断点重新运行，并发现如果从断点移回查询执行命令并逐步执行它，则不会得到错误。下面是一个示例插入：

INSERT INTO OtherMeasures (HapId, SurveyTypeId, Score, Comments) 
    VALUES (86792, 9, 21.00, '').

在这里，创建SQL的VBA代码：

Private Sub storeOthType(ByVal hapId As Long, ByVal othType As String, _
                    ByVal othScore As Integer, ByVal othComment As String, _
                    ByRef db As DAO.Database)
  Dim sql As String
  On Error GoTo foundError

  Dim typeId As Integer
  typeId = lookupId(othType, "Description", "DataTypes", False, db)

  sql = "INSERT INTO OtherMeasures (HapId, SurveyTypeId, Score, " + _
           Comments) " + _
           "VALUES (" + CStr(hapId) + ", " + CStr(typeId) + ", " + _
                        Format(othScore, "##0.00") + ", '" + _
                        Replace(othComment, "'", "''") + "')"
  db.Execute sql, dbFailOnError
  Exit Sub
foundError:
  MsgBox "Error in storeOthType: " + CStr(Err.Number) + ", " + _
       Err.description + ". SQL: " + sql + "."
  logError "Error in storeOthType: " + CStr(Err.Number) + ", " + _
       Err.description + ". SQL: " + sql + "."
End Sub 'storeOthType

有人知道是什么原因造成的吗？我们计划将后端移到SQL Server，我怀疑它将解决这个问题，但在此之前，如果我能够解决这个问题，那就太好了。

Answer 1

它可能是用于空字符串的'‘，而表期望空字符串为Null。

您可能会发现这个函数非常方便，可以避免这样的情况：

' Converts a value of any type to its string representation.
' The function can be concatenated into an SQL expression as is
' without any delimiters or leading/trailing white-space.
'
' Examples:
'   SQL = "Select * From TableTest Where [Amount]>" & CSql(12.5) & "And [DueDate]<" & CSql(Date) & ""
'   SQL -> Select * From TableTest Where [Amount]> 12.5 And [DueDate]< #2016/01/30 00:00:00#
'
'   SQL = "Insert Into TableTest ( [Street] ) Values (" & CSql(" ") & ")"
'   SQL -> Insert Into TableTest ( [Street] ) Values ( Null )
'
' Trims text variables for leading/trailing Space and secures single quotes.
' Replaces zero length strings with Null.
' Formats date/time variables as safe string expressions.
' Uses Str to format decimal values to string expressions.
' Returns Null for values that cannot be expressed with a string expression.
'
' 2016-01-30. Gustav Brock, Cactus Data ApS, CPH.
'
Public Function CSql( _
    ByVal Value As Variant) _
    As String

    Const vbLongLong    As Integer = 20
    Const SqlNull       As String = " Null"

    Dim Sql             As String
    Dim LongLong        As Integer

    #If Win32 Then
        LongLong = vbLongLong
    #End If
    #If Win64 Then
        LongLong = VBA.vbLongLong
    #End If

    Select Case VarType(Value)
        Case vbEmpty            '    0  Empty (uninitialized).
            Sql = SqlNull
        Case vbNull             '    1  Null (no valid data).
            Sql = SqlNull
        Case vbInteger          '    2  Integer.
            Sql = Str(Value)
        Case vbLong             '    3  Long integer.
            Sql = Str(Value)
        Case vbSingle           '    4  Single-precision floating-point number.
            Sql = Str(Value)
        Case vbDouble           '    5  Double-precision floating-point number.
            Sql = Str(Value)
        Case vbCurrency         '    6  Currency.
            Sql = Str(Value)
        Case vbDate             '    7  Date.
            Sql = Format(Value, " \#yyyy\/mm\/dd hh\:nn\:ss\#")
        Case vbString           '    8  String.
            Sql = Replace(Trim(Value), "'", "''")
            If Sql = "" Then
                Sql = SqlNull
            Else
                Sql = " '" & Sql & "'"
            End If
        Case vbObject           '    9  Object.
            Sql = SqlNull
        Case vbError            '   10  Error.
            Sql = SqlNull
        Case vbBoolean          '   11  Boolean.
            Sql = Str(Abs(Value))
        Case vbVariant          '   12  Variant (used only with arrays of variants).
            Sql = SqlNull
        Case vbDataObject       '   13  A data access object.
            Sql = SqlNull
        Case vbDecimal          '   14  Decimal.
            Sql = Str(Value)
        Case vbByte             '   17  Byte.
            Sql = Str(Value)
        Case LongLong           '   20  LongLong integer (Valid on 64-bit platforms only).
            Sql = Str(Value)
        Case vbUserDefinedType  '   36  Variants that contain user-defined types.
            Sql = SqlNull
        Case vbArray            ' 8192  Array.
            Sql = SqlNull
        Case Else               '       Should not happen.
            Sql = SqlNull
    End Select

    CSql = Sql & " "

End Function

请研究典型用法的在线评论。