Getting column name from PipelineBuffer in Script Component in SSIS 2012

Question

I'm trying to get the column name and index from the PipelineBuffer in my script component transformation is SSIS and add them to a Hashtable. I know this is possible if I change my class from: public class ScriptMain : UserComponent to ScriptMain : PipelineComponent and use this code:

public override void ProcessInput(int InputID, Microsoft.SqlServer.Dts.Pipeline.PipelineBuffer Buffer)
{
    inputBuffer = Buffer;
    hash = new Hashtable();
    IDTSInput100 i = ComponentMetaData.InputCollection.GetObjectByID(InputID);
    foreach (IDTSInputColumn100 col in i.InputColumnCollection)
    {
        int colIndex = BufferManager.FindColumnByLineageID(i.Buffer, col.LineageID);
        hash.Add(col.Name, colIndex);
    }
}

However; when I do this I can no longer override: public override void Input0_ProcessInputRow(Input0Buffer Row) Since this is not available in the PipelineComponent class and I can no longer access my connection managers by simply calling something like this: IDTSConnectionManager100 connMgr = this.Connections.DbConnection; From what I can see the BufferManager is not available in the UserComponent class. Is there a way to accomplish this using the UserComponent?

Answer 1

Buddy of mine worked through this with me. You can get the name of the column coming in the script buffer like this:

public override void Input0_ProcessInputRow(Input0Buffer inputBufferRow)
     {
    foreach (IDTSInputColumn100 column in this.ComponentMetaData.InputCollection[0].InputColumnCollection)
            { 
              PropertyInfo columnValue = inputBufferRow.GetType().GetProperty(column.Name);
            }
       }

You can get the column index and name in the script buffer by using reflection in the script component and loading them into a filtered list like this:

IList<string> propertyList = new List<string>();
                    var properties = typeof(Input0Buffer).GetProperties();
                    foreach (var property in properties)
                    {
                        if (!property.Name.EndsWith("_IsNull"))
                            propertyList.Add(property.Name);
                    }

You can then access the list to get the index value in the script buffer using the name of the PropertyInfo object:

int index = (propertyList.IndexOf(columnValue.Name));

In order to then link this up with the index of the column in the input pipeline buffer you need to create a class attribute:

int[] BufferColumnIndexes; 

Then override ProcessInput and add the indexes from the input pipeline buffer that map to the script buffer indexes:

public override void ProcessInput(int InputID, Microsoft.SqlServer.Dts.Pipeline.PipelineBuffer Buffer)
    {
        inputBuffer = Buffer;
        BufferColumnIndexes = GetColumnIndexes(InputID);
        base.ProcessInput(InputID, Buffer);
    }

Now to link these up:

int index = (propertyList.IndexOf(columnValue.Name)); //index in script buffer
int index2 = (BufferColumnIndexes[index]); //index in input pipeline buffer