public void AddPathsAndConnectColumns(Hashtable colPairs)
{
IDTSOutput100 srcOutput = srcComp.OutputCollection[0];
IDTSOutputColumnCollection100 srcOutputCols = srcOutput.OutputColumnCollection;
IDTSInput100 destInput = destComp.InputCollection[0];
IDTSInputColumnCollection100 destInputCols = destInput.InputColumnCollection;
IDTSExternalMetadataColumnCollection100 destExtCols = destInput.ExternalMetadataColumnCollection;
Hashtable destColtable = new Hashtable(destExtCols.Count);
foreach (IDTSExternalMetadataColumn100 extCol in destExtCols)
{
destColtable.Add(extCol.Name, extCol);
}
bool useMatch = (colPairs != null && colPairs.Count > 0);
// colConvertTable stores a pair of columns which need a type conversion
// colConnectTable stores a pair of columns which dont need a type conversion and can be connected directly.
Hashtable colConvertTable = new Hashtable(srcOutputCols.Count);
Hashtable colConnectTable = new Hashtable(srcOutputCols.Count);
foreach (IDTSOutputColumn100 outputCol in srcOutputCols)
{
// Get the column name to look for in the destination.
// Match column by name if match table is not used.
String colNameToLookfor = String.Empty;
if (useMatch)
{
colNameToLookfor = (String)colPairs[outputCol.Name];
}
else
{
colNameToLookfor = outputCol.Name;
}
IDTSExternalMetadataColumn100 extCol = (String.IsNullOrEmpty(colNameToLookfor)) ? null : (IDTSExternalMetadataColumn100)destColtable[colNameToLookfor];
// Does the destination column exist?
if (extCol != null)
{
// Found destination column, but is data type conversion needed?
if (NeedConvert(outputCol.DataType, extCol.DataType))
{
colConvertTable.Add(outputCol.ID, extCol);
}
else
{
colConnectTable.Add(outputCol.ID, extCol);
}
}
}
if (colConvertTable.Count > 0)
{
// add convert component
AddConvertComponent(colConvertTable, colConnectTable);
pipeline.PathCollection.New().AttachPathAndPropagateNotifications(convertComp.OutputCollection[0], destInput);
}
else
{
// Convert transform not needed. Connect src and destination directly.
pipeline.PathCollection.New().AttachPathAndPropagateNotifications(srcOutput, destInput);
}
IDTSVirtualInput100 destVirInput = destInput.GetVirtualInput();
foreach (object key in colConnectTable.Keys)
{
int colID = (int)key;
IDTSExternalMetadataColumn100 extCol = (IDTSExternalMetadataColumn100)colConnectTable[key];
// Create an input column from an output col of previous component.
destVirInput.SetUsageType(colID, DTSUsageType.UT_READONLY);
IDTSInputColumn100 inputCol = destInputCols.GetInputColumnByLineageID(colID);
if (inputCol != null)
{
// map the input column with an external metadata column
destDesignTimeComp.MapInputColumn(destInput.ID, inputCol.ID, extCol.ID);
}
}
}