快问你们。我正在编写一些ETL，我需要从平面文件中解析出一个字段，其中日期列为YYYYDDD格式。目标是将其加载到数据库列中并显示为YYYY-MM-DD。
如何在SSIS包中做得最好？有没有办法在包中做到这一点？记录体首先被加载到原始表中，所以如果您知道自定义SQL来处理这个问题，我可以将它添加到SQL步骤来解析它。
非常感谢任何帮助。谢谢，
答案 0 :(得分：0)
这样的事情怎么样：
select dateadd(day, cast(right(YYYYDDD, 3) as int) - 1,
cast(left(YYYYDD, 4) + '0101' as date))
SQL Server将YYYYMMDD格式的字符串识别为日期，并且应始终将它们转换为无错误。
答案 1 :(得分：0)
当我遇到YYYYDDD日期时，我会在脚本转换中使用VB将它们转换为实际日期：
Row.MaturityDate = DateSerial(CInt(Left(Row.MaturityDate,4)),1,CInt(Right(Row.MaturityDate,3))).ToShortDateString
在这种情况下， MaturityDate 列是文本/字符串列，并设置为ReadWrite。因此，日期从 MaturityDate 列中读取，修改后再写回 MaturityDate 列。
您可以添加一个新列（具有不同的数据类型，例如日期数据类型之一）到脚本转换，从传入列读取并写入新的传出列...保持传入列可以参考。
我遇到了许多不同格式的日期。我写了一个VB UDF处理我到目前为止遇到的格式。如果它对你有用，那么你非常欢迎它（注意：我比VB.Net更熟悉VB6 / VBA，所以这个UDF更多是VBA风格，但仍然适用于VB.Net ）：
Public Function ParseDate(ByVal pstrDate As String, ByVal pstrFormat As String, Optional ByVal pblnMEDate As Boolean = False) As Date
Dim pstrYear As String
Dim pstrMonth As String
Dim pstrDay As String
Dim pintYear As Integer
Dim pintMonth As Integer
Dim pintDay As Integer
Dim pint4DigitCurrentYear As Integer
Dim pint2DigitCurrentYear As Integer
Dim pdteDate As Date
Dim pintLen As Integer
'pint4DigitCurrentYear = Year(mdteMEDate)'
'pint2DigitCurrentYear = pint4DigitCurrentYear - 2000'
pstrFormat = UCase(pstrFormat)
Select Case pstrFormat
Case "YYYY MMM"
pstrYear = Left(pstrDate, 4)
pstrMonth = Right(pstrDate, 3)
pstrDate = pstrMonth & " " & pstrYear
pdteDate = DateValue(pstrDate)
Case "MMYYYY"
pstrYear = Right(pstrDate, 4)
pstrMonth = Left(pstrDate, 2)
pstrDate = pstrMonth & " " & pstrYear
pdteDate = DateValue(pstrDate)
Case "MMMYY"
pstrDate = Left(pstrDate, Len(pstrDate) - 2) & " 20" & Right(pstrDate, 2)
pstrDate = Replace(pstrDate, "JLY", "JUL")
pdteDate = DateValue(pstrDate)
Case "MMM YY"
pstrDate = Left(pstrDate, Len(pstrDate) - 2) & "20" & Right(pstrDate, 2)
pstrDate = Replace(pstrDate, "Sept", "Sep")
pdteDate = DateValue(pstrDate)
Case "MMMYYYY", "MMM YYYY"
pstrYear = Right(pstrDate, 4)
pstrMonth = Left(pstrDate, 3)
pstrDate = pstrMonth & " " & pstrYear
pstrDate = Replace(pstrDate, "Sept", "Sep")
pdteDate = DateValue(pstrDate)
Case "MMMM YY"
pstrYear = "20" & Right(pstrDate, 2)
pstrMonth = Trim(Left(pstrDate, Len(pstrDate) - 2))
pstrDate = pstrMonth & " " & pstrYear
pdteDate = DateValue(pstrDate)
Case "MMMMYYYY"
pstrYear = Right(pstrDate, 4)
pstrMonth = Left(pstrDate, Len(pstrDate) - 4)
pstrDate = pstrMonth & " " & pstrYear
pdteDate = DateValue(pstrDate)
Case "DATEVALUE"
pdteDate = DateValue(pstrDate)
Case Else
Select Case pstrFormat
Case "YYYYDDD"
pstrYear = Left(pstrDate, 4)
pstrMonth = "1"
pstrDay = Right(pstrDate, 3)
Case "YYYYMMDD"
pstrYear = Left(pstrDate, 4)
pstrMonth = Mid(pstrDate, 5, 2)
pstrDay = Right(pstrDate, 2)
Case "YYYY-MM-DD"
pstrYear = Left(pstrDate, 4)
pstrMonth = Mid(pstrDate, 6, 2)
pstrDay = Right(pstrDate, 2)
Case "YYMMDD"
pstrYear = "20" & Left(pstrDate, 2)
pstrMonth = Mid(pstrDate, 3, 2)
pstrDay = Right(pstrDate, 2)
Case "YYYY-MM", "YYYYMM", "YYYY MM"
pstrYear = Left(pstrDate, 4)
pstrMonth = Right(pstrDate, 2)
pstrDay = "1"
Case "YYMM"
pstrYear = "20" & Left(pstrDate, 2)
pstrMonth = Right(pstrDate, 2)
pstrDay = "1"
Case "DDMMYYYY"
pstrYear = Right(pstrDate, 4)
pstrMonth = Mid(pstrDate, 3, 2)
pstrDay = Left(pstrDate, 2)
Case "MDDYYYY", "MMDDYYYY"
pintLen = Len(pstrDate)
pstrYear = Right(pstrDate, 4)
pstrMonth = Left(pstrDate, pintLen - 6)
pstrDay = Mid(pstrDate, pintLen - 5, 2)
Case "MDDYY"
pintLen = Len(pstrDate)
pstrYear = Right(pstrDate, 2)
pstrMonth = Left(pstrDate, pintLen - 4)
pstrDay = Mid(pstrDate, pintLen - 3, 2)
Case "MMDDYY"
pstrYear = "20" & Right(pstrDate, 2)
pstrMonth = Left(pstrDate, 2)
pstrDay = Mid(pstrDate, 3, 2)
Case "MM-DD-YYYY", "M-DD-YYYY", "M.DD.YYYY"
pstrYear = Right(pstrDate, 4)
pstrMonth = Left(pstrDate, Len(pstrDate) - 8)
pstrDay = Mid(pstrDate, Len(pstrDate) - 6, 2)
Case "M-DD-YY", "MM-DD-YY", "M/DD/YY", "MM/DD/YY"
pstrYear = Right(pstrDate, 2)
pstrMonth = Left(pstrDate, Len(pstrDate) - 6)
pstrDay = Mid(pstrDate, Len(pstrDate) - 4, 2)
Case "M-DD-YY PAST", "MM-DD-YY PAST", "M/DD/YY PAST", "MM/DD/YY PAST"
pintLen = Len(pstrDate)
pstrYear = Right(pstrDate, 2)
pintYear = CInt(pstrYear)
If pintYear > pint2DigitCurrentYear Then
pstrYear = "19" & pstrYear
ElseIf pintYear <= pint2DigitCurrentYear Then
pstrYear = "20" & pstrYear
Else
pstrYear = "99" & pstrYear
End If
pstrMonth = Left(pstrDate, Len(pstrDate) - 6)
pstrDay = Mid(pstrDate, Len(pstrDate) - 4, 2)
Case "MMYYDD PAST"
'pintLen = Len(pstrDate)'
pstrYear = Mid(pstrDate, 3, 2)
pintYear = CInt(pstrYear)
If pintYear > pint2DigitCurrentYear Then
pstrYear = "19" & pstrYear
ElseIf pintYear <= pint2DigitCurrentYear Then
pstrYear = "20" & pstrYear
Else
pstrYear = "99" & pstrYear
End If
pstrMonth = Left(pstrDate, 2)
pstrDay = Right(pstrDate, 2)
Case "DT6 PAST"
pintLen = Len(pstrDate)
pstrYear = Right(pstrDate, 2)
pintYear = CInt(pstrYear)
If pintYear > pint2DigitCurrentYear Then
pstrYear = "19" & pstrYear
ElseIf pintYear <= pint2DigitCurrentYear Then
pstrYear = "20" & pstrYear
Else
pstrYear = "99" & pstrYear
End If
pstrMonth = Left(pstrDate, pintLen - 4)
pstrDay = Mid(pstrDate, pintLen - 3, 2)
Case "DT6 PAST PLUS 10"
pintLen = Len(pstrDate)
'pint4DigitCurrentYear = Year(mdteMEDate) + 10'
pint2DigitCurrentYear = pint4DigitCurrentYear - 2000
pstrYear = Right(pstrDate, 2)
pintYear = CInt(pstrYear)
If pintYear > pint2DigitCurrentYear Then
pstrYear = "19" & pstrYear
ElseIf pintYear <= pint2DigitCurrentYear Then
pstrYear = "20" & pstrYear
Else
pstrYear = "99" & pstrYear
End If
pstrMonth = Left(pstrDate, pintLen - 4)
pstrDay = Mid(pstrDate, pintLen - 3, 2)
Case "MYY"
pstrYear = "20" & Right(pstrDate, 2)
pstrMonth = Left(pstrDate, Len(pstrDate) - 2)
pstrDay = "1"
Case "MMYY", "MM-YY", "MM/YY"
pstrDate = Replace(pstrDate, "-", "")
pstrDate = Replace(pstrDate, "/", "")
pstrYear = "20" & Right(pstrDate, 2)
pstrMonth = Left(pstrDate, 2)
pstrDay = "1"
Case "MMYY PAST", "MM-YY PAST", "MM/YY PAST"
pstrDate = Replace(pstrDate, "-", "")
pstrDate = Replace(pstrDate, "/", "")
pstrYear = Right(pstrDate, 2)
pintYear = CInt(pstrYear)
If pintYear > pint2DigitCurrentYear Then
pstrYear = "19" & pstrYear
ElseIf pintYear <= pint2DigitCurrentYear Then
pstrYear = "20" & pstrYear
Else
pstrYear = "99" & pstrYear
End If
pstrMonth = Left(pstrDate, 2)
pstrDay = "1"
Case "MM-YYYY"
pstrYear = Right(pstrDate, 4)
pstrMonth = Left(pstrDate, 2)
pstrDay = "1"
Case "M-YYYY"
pstrYear = Right(pstrDate, 4)
pstrMonth = Left(pstrDate, Len(pstrDate) - 5)
pstrDay = "1"
Case Else
MsgBox("Date Format does not exist in function." & vbCrLf & vbCrLf & "Please add it.", vbInformation, "Date Format")
'ParseDate = CVErr(xlErrRef)'
Exit Function
'pstrYear = "9999"'
'pstrMonth = "99"'
'pstrDay = "99"'
End Select
pintYear = CInt(pstrYear)
pintMonth = CInt(pstrMonth)
pintDay = CInt(pstrDay)
pdteDate = DateSerial(pintYear, pintMonth, pintDay)
End Select
If pblnMEDate Then
pdteDate = DateSerial(Year(pdteDate), Month(pdteDate) + 1, 0)
End If
'ParseDate = pdteDate.ToShortDateString'
ParseDate = pdteDate
End Function
如果有人对我的代码进行了改进，我很乐意看到它们。
HTH