数据流任务中的增量变量

Question

我有一个很大的文本文件，其中有多个不同的行。

我正在使用条件拆分，它会查看行类型（字段 1）然后执行操作，主要是尝试增加一个变量，将单行拆分为多列（派生），然后将结果写入table.

但是，当尝试增加变量时，我得到 "The collection of variables locked for read and write access is not available outside of PostExecute."

正在使用脚本组件更新变量。

我曾尝试将代码移动到 PostExecute，但在那个时候，它似乎永远不会增加。


Public Overrides Sub Input0_ProcessInputRow(ByVal Row As Input0Buffer)

    Dim MaximumKey As Int32 = Me.Variables.SPIParentID ' Grab value of MaxKey which was passed in

    ' NextKey will always be zero when we start the package.
    ' This will set up the counter accordingly
    If (NextKey = 0) Then
        ' Use MaximumKey +1 here because we already have data
        ' and we need to start with the next available key
        NextKey = MaximumKey + 1
    Else
        ' Use NextKey +1 here because we are now relying on
        ' our counter within this script task.
        NextKey = NextKey + 1
    End If

    'Row.pkAAAParentID = NextKey ' Assign NextKey to our ClientKey field on our data row
    Me.Variables.SPIParentID = NextKey
End Sub

我希望能够使用我已有的条件拆分遍历文件，然后当它到达某个记录类型时，它将获取当前的 RecordTypeID 并递增它，然后写出到下一条记录.

Answer 1

SSIS 变量值不能在数据流任务中更改，该值在执行整个数据流任务后更改。任何时候你试图从这个变量中读取值，它都会 return 它的值，当数据流任务被执行时。您可以更改在脚本中使用局部变量来实现相同的逻辑：

Dim MaximumKey As Int32 = 0 

Public Overrides Sub PreExecute()

    MyBase.PreExecute()

    MaximumKey = Me.Variables.SPIParentID ' Read the initial value of the variable

End Sub

Public Overrides Sub Input0_ProcessInputRow(ByVal Row As Input0Buffer)

    ' NextKey will always be zero when we start the package.
    ' This will set up the counter accordingly
    If (NextKey = 0) Then
        ' Use MaximumKey +1 here because we already have data
        ' and we need to start with the next available key
        NextKey = MaximumKey + 1
    Else
        ' Use NextKey +1 here because we are now relying on
        ' our counter within this script task.
        NextKey = NextKey + 1
    End If

    'Row.pkAAAParentID = NextKey ' Assign NextKey to our ClientKey field on our data row
    Me.Variables.SPIParentID = NextKey
End Sub

Public Overrides Sub PostExecute()

    MyBase.PostExecute()

    Me.Variables.SPIParentID = MaximumKey ' Save the latest value into the variable

End Sub

数据流任务中的增量变量

Increment Variables in Data Flow task

sql-server

vb.net

ssis

etl

script-component