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IDTSBufferManager90.FindColumnByLineageID Method

SQL Server 2005

Gets the location, by index, of a column in a specified IDTSBuffer90 object.

Namespace: Microsoft.SqlServer.Dts.Pipeline.Wrapper
Assembly: Microsoft.SqlServer.DTSPipelineWrap (in microsoft.sqlserver.dtspipelinewrap.dll)

[DispIdAttribute(121)] 
int FindColumnByLineageID (
	[InAttribute] int hBufferType,
	[InAttribute] int nLineageID
)
/** @attribute DispIdAttribute(121) */ 
int FindColumnByLineageID (
	/** @attribute InAttribute() */ int hBufferType, 
	/** @attribute InAttribute() */ int nLineageID
)
DispIdAttribute(121) 
function FindColumnByLineageID (
	hBufferType : int, 
	nLineageID : int
) : int

Parameters

hBufferType

The ID of the IDTSBuffer90 object that contains the column.

nLineageID

The lineage ID of the column to locate in the IDTSBuffer90.

Return Value

An integer that indicates the location, by index, of the column in the IDTSBuffer90.

This method locates the column of an IDTSInput90 or IDTSOutput90 in the specified IDTSBuffer90. This method is necessary because an instance of a buffer contains all of the IDTSOutputColumn90 objects defined in the IDTSOutputColumnCollection90 collections of the components in a graph. Components cannot rely on using the index location of its output column, or input column, as the index of that column in a buffer row. Because of this, components must use FindColumnByLineageID to locate the columns in the buffer.


The following code example shows how a transformation component that does not have output columns uses the FindColumnByLineageID to locate its input columns in the buffer.

int[] bufferColumnIndex;
public override void PreExecute()
{
    IDTSInput90 input = ComponentMetaData.InputCollection[0];
    bufferColumnIndex = new int[BufferManager.GetColumnCount(input.Buffer)];

    for( int col=0; col < input.InputColumnCollection.Count; col++)
    {
        IDTSInputColumn90 iCol = input.InputColumnCollection[col];
        bufferColumnIndex[col] = BufferManager.FindColumnByLineageID(input.Buffer, iCol.LineageID);
    }
}

Any public static (Shared in Microsoft Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Development Platforms

For a list of the supported platforms, see Hardware and Software Requirements for Installing SQL Server 2005.

Target Platforms

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