SSIS Script Component - Iterating Through Input Columns

Nov 26, 2007



I'm trying write a reusable script component that takes data from rows that were rejected from a SQL Destination operation and put them into a common SQL error table.

This script would basically function to take the input columns selected in the script, and build a delimited string, (similar to the 'Flat File Source Error Output' that is contains redirected rows from reading a flat file) and insert this string into a SQL table called 'SourceData' to store errors.

I'm trying to script the component to iterate through all input columns (as selected in the input columns screen) and build a simple string.






Code Block
Public Overrides Sub Input0_ProcessInputRow(ByVal Row As Input0Buffer)
'Use the incoming error number as a parameter to GetErrorDescription
Row.ErrorDescription = ComponentMetaData.GetErrorDescription(Row.ErrorCode)
Try

Row.ErrorColumnName = ComponentMetaData.InputCollection(0).InputColumnCollection(Row.ErrorColumn).Name
Catch ex As Exception

Row.ErrorColumnName = String.Concat("Column Name retrieval failure. Details", ex.Message)
End Try
'
'Build input data
'
Dim inData As String

For Each inputCol As IDTSInputColumn90 In ComponentMetaData.InputCollection(0).InputColumnCollection
inData = String.Concat(inData, "~", inputCol.Name) 'I don't want the name, but the value.
Next
Row.SourceData = inData
'
End Sub


I've only got as far as iterating the names of columns in the input buffer, but how do i get the values?

The result i'm trying to achieve is :
Selected columns in 'Input Column' screen : Name, Address, Phone
OutPut column 'SourceData' value : Harry~Melbourne~None

I don't want to write the code as:



Code Block
inData = Row.Name
indata = String.Concat(inData,"~",Row.Address)
indata = string.concat(inData,"~",Row.Phone)

as this make my code not very reusable. I've got some tables which are 100+ columns long and I don't wish modify the code too much

I have also tried overriding the ProcessInput() function of the script component to iterate through the buffer columns :



Code Block
Public Overrides Sub ProcessInput(ByVal InputID As Integer, ByVal Buffer As Microsoft.SqlServer.Dts.Pipeline.PipelineBuffer)

MyBase.ProcessInput(InputID, Buffer)

Dim iCnt As Integer = 0
Dim inData As String

If Buffer.ColumnCount > 0 Then

For iCnt = 0 To Buffer.ColumnCount - 1

inData = String.Concat(Buffer.Item(iCnt)) 'Error thrown here: PipelineBuffer has encountered an invalid row index value.
Next
End If
End Sub





but i get an error when i run it.

Please help.

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===================================

The component could not be added to the Data Flow task.
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===================================

Error at Data Flow Task [Replica Transformation [1289]]: System.Runtime.InteropServices.COMException (0xC0048004): Exception from HRESULT: 0xC0048004
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===================================

Exception from HRESULT: 0xC0048004 (Microsoft.SqlServer.DTSPipelineWrap)

------------------------------
Program Location:

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Code Snippet

public override void ProvideComponentProperties()
{
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IDTSInput90 input2 = ComponentMetaData.InputCollection.New();
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// Add the output
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output.SynchronousInputID = input.ID;
output.ExclusionGroup = 1;

// Add the error output
AddErrorOutput("StagingErrorOutput", input.ID, output.ExclusionGroup);

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IDTSOutputColumn90 column0 = ComponentMetaData.OutputCollection[1].OutputColumnCollection.New();
column0.Name = m_SyncStatusColumnName;
column0.SetDataTypeProperties(DataType.DT_STR, 1, 0, 0, 1252);

IDTSOutputColumn90 column1 = ComponentMetaData.OutputCollection[2].OutputColumnCollection.New();
column1.Name = m_AS400ImportedDateColumnName;
column1.SetDataTypeProperties(DataType.DT_DATE, 0, 0, 0, 0);

}

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p.s

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Data Mining In 2005 - Same Input Columns Resulting In Different Decision Trees

Dec 12, 2007

While recently working with several mining models, I came across something that struck me as pretty odd - and I'm hoping to find an explanation for the behavior.

Consider the following setup:


A single table in the relational database represents the only case table
A single, continuous column is the predictable
A mining structure has been created

The mining structure contains a single model, based on the MS Decision Trees algorithm
Input columns were selected for the model via the BI Studio wizard (i.e., those provided via the "Suggest" button)
The structure has been fully processed
Now, the interesting parts:


I view the scatterplot for the mining model, under the Mining Accuracy Chart tab
Back on the Mining Structure tab, I delete one of the input columns
I add the same column back into the structure
The structure is fully processed again
When I view the scatterplot for the mining model, under the Mining Accuracy Chart tab, a different set of data points are presented for the model predictions
A different set of decision trees under the Mining Model Viewer tab confirms thisHow could different patterns have been found this second time around, even though all of the input columns were the same (as well as the training cases)?

(Note: I encountered this situation while creating a new mining model that was identical to an existing one. Even though the models received the exact same inputs and training cases, they yielded different results. I was able to reproduce the behavior by using steps 1-6 above, though.)

Can someone provide some insight on this behavior, or some kind of explanation of what may be happening?


Thanks,
Joe Miller

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