日期时间的 SSIS 源格式隐式转换

2021-12-30 00:00:00 sql etl sql-server ssis ssis-2012

有谁知道显示 SSIS 中不同数据类型支持哪些日期格式的图表?例如，DT_DBTimestamp 是否支持 1-Jan 格式.我试图寻找但找不到任何东西.

Does anyone know of a chart that shows which formats of dates are supported by the different datatypes in SSIS? For example, does DT_DBTimestamp support the format 1-Jan. I tried looking but couldn't find anything.

我问的原因是我发现当我尝试执行 Convert(datetime, '1-Jan') 时，它失败了我的预期.但是，当我将这个相同的值拉入 SSIS 到 DT_DBTimestamp 中时，它会将其隐式标识为 1/1/2017 而不是将行重定向为数据类型转换错误.

The reason I ask is that I found that when I try to do a Convert(datetime, '1-Jan') it fails which I expected. However, when I pull this same value into SSIS into the DT_DBTimestamp, it will implicitly identify it as 1/1/2017 rather than redirect the row as a datatype conversion error.

推荐答案

一般信息

这些是日期时间数据类型的默认格式(从字符串转换时)

General Info

These are the default formats of datetimes datatypes (when converting from string)

DT_DBDATE
yyyy-mm-dd

DT_FILETIME
yyyy-mm-dd hh:mm:ss:fff

DT_DBTIME
hh:mm:ss

DT_DBTIME2
hh:mm:ss[.fffffff]

DT_DBTIMESTAMP
yyyy-mm-dd hh:mm:ss[.fff]

DT_DBTIMESTAMP2
yyyy-mm-dd hh:mm:ss[.fffffff]

DT_DBTIMESTAMPOFFSET
yyyy-mm-dd hh:mm:ss[.fffffff] [{+|-} hh:mm]

注意:DT_DATE 和 DT_DBTIMESTAMP 具有相同的 SET 方法

而且我认为将字符串转换为日期还取决于您当前的文化信息

在这里可以找到更多详细信息

More detailed information are found here

  • 集成服务数据类型
  • SSIS TO SQL SERVER 数据类型翻译

阅读您的评论后，我没有找到任何与您的问题相关的文章，因此我进行了以下实验:

After reading your comment i didn't find any related article to your question so i made the following experiments:

SSIS 隐式日期时间转换

我创建了一个带有 Dataflowtask 的 SSIS 包.在这个数据流任务中，我创建了一个脚本组件(作为源)和一个平面文件目标.该脚本有一个类型为 DT_DbTimeStamp 的输出列 OutDate 在脚本中我使用了以下代码:

i created a SSIS package with a Dataflowtask. in this dataflowtask i created a Script Component (as a Source) and a Flat File Destination. The script has one output column OutDate of type DT_DbTimeStamp Inside the script i used the following code:

Private dtDate As Date = #01/01/2016#

Public Overrides Sub CreateNewOutputRows()

    Output0Buffer.AddRow()


    Using sw As New IO.StreamWriter("D:Result.txt", False)
        sw.WriteLine("CultureInfo;Date;Format;Accepted")
        sw.Close()
    End Using


    For Each ci As System.Globalization.CultureInfo In System.Globalization.CultureInfo.GetCultures(Globalization.CultureTypes.AllCultures)

        For Each strFormat As String In ci.DateTimeFormat.GetAllDateTimePatterns

            Dim boolResult As Boolean = True
            Try


                Output0Buffer.OutDate = dtDate.ToString(strFormat)

                boolResult = True

            Catch ex As Exception

                boolResult = False



            End Try

            Using sw As New IO.StreamWriter("D:Result.txt", True)
                sw.WriteLine(ci.Name & ";" & dtDate.ToString(strFormat) & ";" & strFormat & ";" & boolResult.ToString)
                sw.Close()
            End Using

        Next



    Next



End Sub

首先，我遍历所有文化信息，并获取与其相关的所有日期时间格式并遍历它们.然后我试图将声明的日期 dtDate 转换为格式化字符串并将其分配给输出列.

First i am looping over all culture info and i am Getting all datetime formats related to it and looping over them. Then i am trying to convert the date dtDate declared to a formatted string and assign it to the Output column.

因此，如果接受将具有指定格式的字符串值分配给 DT_DBTIMESTAMP 输出列，则表示格式已隐式转换

So if assigning string value with specified format to DT_DBTIMESTAMP output column is accepted that means the format is implicit converted

Output0Buffer.OutDate = dtDate.ToString(strFormat)

这是结果文件的链接:

  • Result.txt

SQL Server 日期时间隐式转换

有两种日期时间字符串格式可以使用任何语言设置正确解释.

There are two datetime string formats that are interpreted correctly with with any language setting. 

yyyyMMdd
yyyy-MM-ddTHH:mm:ss    (ISO8601)

另外，你可以重复同样的实验，但这次通过创建一个 SqlCommand 并执行它:

Also, you can repeat the same experiment But this time by creating an SqlCommand and executing it:

Dim sqlcmd as new SqlCommand("SELECT CONVERT(DATETIME,'" + dtdate.ToString(strFormat) + '")"

sqlCmd.ExecuteReader()

这样，如果 sqlcmd 抛出异常，则表示无法转换格式.

That way you can if sqlcmd throws an exception it means that format cannot be converted.

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