PipelineComponent.BufferManager Property

Artigo
12/03/2008

Gets the IDTSBufferManager90 of the pipeline component. This property is not CLS-compliant.

Namespace: Microsoft.SqlServer.Dts.Pipeline
Assembly: Microsoft.SqlServer.PipelineHost (in microsoft.sqlserver.pipelinehost.dll)

Syntax

'Declaration
<CLSCompliantAttribute(False)> _
Public ReadOnly Property BufferManager As IDTSBufferManager90

[CLSCompliantAttribute(false)] 
public IDTSBufferManager90 BufferManager { get; }

[CLSCompliantAttribute(false)] 
public:
property IDTSBufferManager90^ BufferManager {
    IDTSBufferManager90^ get ();
}

/** @property */
public IDTSBufferManager90 get_BufferManager ()

public function get BufferManager () : IDTSBufferManager90

Property Value

The IDTSBufferManager90 object.

Remarks

The BufferManager is a read only, execution-time property that is first available to components in the PreExecute method.

The FindColumnByLineageID method is used to locate a component's columns in the IDTSInputColumnCollection90 or IDTSOutputColumnCollection90 of the component, in the PipelineBuffer. This is necessary because the number of columns contained in the PipelineBuffer may exceed the number of columns expected by the component.

The BufferManager is also used to create new IDTSBuffer90 objects using the CreateBuffer, CreateFlatBuffer, and CreateVirtualBuffer methods. However, these methods are not supported from managed code, and should only be used when writing native C++ components.

Example

The following code example shows how to use the BufferManager property to locate the columns in a PipelineBuffer row.

using System;
using Microsoft.SqlServer.Dts.Pipeline;
using Microsoft.SqlServer.Dts.Pipeline.Wrapper;
using Microsoft.SqlServer.Dts.Runtime.Wrapper;

namespace Microsoft.Samples.SqlServer.Dts
{
    public class SampleComponent : PipelineComponent
    {
        public override void ProcessInput( int InputID, PipelineBuffer buffer )
        {
            IDTSInput90 i = ComponentMetaData.InputCollection.GetObjectByID( InputID );
            foreach( IDTSInputColumn90 col in i.InputColumnCollection)
            {
                int colIndex = BufferManager.FindColumnByLineageID(i.Buffer, col.LineageID);
                BufferColumn bc =buffer.GetColumnInfo(colIndex);
            }
        }
    }
}

Imports System 
Imports Microsoft.SqlServer.Dts.Pipeline 
Imports Microsoft.SqlServer.Dts.Pipeline.Wrapper 
Imports Microsoft.SqlServer.Dts.Runtime.Wrapper 
Namespace Microsoft.Samples.SqlServer.Dts 

 Public Class SampleComponent 
 Inherits PipelineComponent 

   Public Overrides Sub ProcessInput(ByVal InputID As Integer, ByVal buffer As PipelineBuffer) 
     Dim i As IDTSInput90 = ComponentMetaData.InputCollection.GetObjectByID(InputID) 
     For Each col As IDTSInputColumn90 In i.InputColumnCollection 
       Dim colIndex As Integer = BufferManager.FindColumnByLineageID(i.Buffer, col.LineageID) 
       Dim bc As BufferColumn = buffer.GetColumnInfo(colIndex) 
     Next 
   End Sub 
 End Class 
End Namespace

Thread Safety

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.

Platforms

Development Platforms

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

Target Platforms