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PipelineBuffer 类

Provides an in-memory data store containing rows and columns of data.

继承层次结构

System. . :: . .Object
  Microsoft.SqlServer.Dts.Pipeline..::..PipelineBuffer

命名空间：  Microsoft.SqlServer.Dts.Pipeline
程序集：  Microsoft.SqlServer.PipelineHost（在 Microsoft.SqlServer.PipelineHost.dll 中）

语法

声明
Public Class PipelineBuffer _
    Implements IDisposable
用法
Dim instance As PipelineBuffer

public class PipelineBuffer : IDisposable

public ref class PipelineBuffer : IDisposable

type PipelineBuffer =  
    class
        interface IDisposable
    end

public class PipelineBuffer implements IDisposable

PipelineBuffer 类型公开以下成员。

构造函数

  名称 说明
受保护方法 PipelineBuffer Instantiates a new instance of the PipelineBuffer.

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属性

  名称 说明
公共属性 ColumnCount Gets the number of columns in the PipelineBuffer.
公共属性 CurrentRow Gets the index of the current row in the PipelineBuffer.
公共属性 EndOfRowset Gets a value indicating whether the current PipelineBuffer is the final buffer.
公共属性 Item Gets the data stored in a buffer column.
公共属性 Mode Gets a value indicating whether a PipelineBuffer is an IDTSInput100 buffer or an IDTSOutput100 buffer.
公共属性 RowCount Gets the number of rows in the PipelineBuffer object.

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方法

  名称 说明
公共方法 AddBlobData(Int32, array<Byte> [] () [] []) Adds an array of bytes to a PipelineBuffer column.
公共方法 AddBlobData(Int32, array<Byte> [] () [] [], Int32) Adds an array of a specified number of bytes to a PipelineBuffer column.
公共方法 AddRow Adds a row to the PipelineBuffer object.
公共方法 DirectErrorRow(Int32, Int32, Int32) Sends a PipelineBuffer row to an IDTSOutput100 whose IsErrorOut property is true.
公共方法 DirectErrorRow(Int32, Int32, Int32, Int32) Sends a PipelineBuffer row to an IDTSOutput100 whose IsErrorOut property is true.
公共方法 DirectRow Sends a row from a PipelineBuffer to the specified IDTSOutput100.
公共方法 Dispose() () () () Releases all resources used by the PipelineBuffer.
受保护方法 Dispose(Boolean) Releases the unmanaged resources that are used by the PipelineBuffer, and optionally releases the managed resources.
公共方法 Equals （从 Object 继承。）
受保护方法 Finalize Releases all resources used by the PipelineBuffer. （覆盖 Object. . :: . .Finalize() () () ()。）
公共方法 GetBlobData Retrieves an array of bytes from a binary large object (BLOB) stored in a PipelineBuffer column.
公共方法 GetBlobLength Gets the number of bytes contained in a binary large object (BLOB) PipelineBuffer column.
公共方法 GetBoolean Gets the bool value stored in the PipelineBuffer column.
公共方法 GetByte Gets the byte value stored in the PipelineBuffer column.
公共方法 GetBytes Gets the array of bytes stored in a buffer column.
公共方法 GetColumnInfo Retrieves the BufferColumn structure for a PipelineBuffer column.
公共方法 GetDate Gets the DateTime value stored in the PipelineBuffer column.
公共方法 GetDateTime Gets the DateTime value stored in the PipelineBuffer column.
公共方法 GetDateTimeOffset Gets the DateTimeOffset value stored in the PipelineBuffer column.
公共方法 GetDecimal Gets the decimal value stored in the PipelineBuffer column.
公共方法 GetDouble Gets the double stored in the PipelineBuffer column.
公共方法 GetGuid Gets the Guid value stored in the PipelineBuffer column.
公共方法 GetHashCode （从 Object 继承。）
公共方法 GetInt16 Gets the short stored in the PipelineBuffer column.
公共方法 GetInt32 Gets the int stored in a PipelineBuffer column.
公共方法 GetInt64 Gets the long stored in the PipelineBuffer column.
公共方法 GetSByte Gets the SByte value stored in a PipelineBuffer column.
公共方法 GetSingle Gets the float stored in a PipelineBuffer column.
公共方法 GetString Gets the string stored in the buffer column.
公共方法 GetTime Gets the TimeSpan value stored in the PipelineBuffer column.
公共方法 GetType （从 Object 继承。）
公共方法 GetUInt16 Gets the ushort value stored in the buffer column.
公共方法 GetUInt32 Gets the UInt32 value stored in the buffer column.
公共方法 GetUInt64 Gets the ulong value stored in the buffer column.
公共方法 IsNull Checks to see if the data in a buffer column is null.
受保护方法 MemberwiseClone （从 Object 继承。）
公共方法 NextRow Advances the PipelineBuffer to the next row.
公共方法 RemoveRow Removes the current row from the PipelineBuffer.
公共方法 ResetBlobData Deletes the contents of the specified BLOB column.
公共方法 SetBoolean Assigns a bool value to a PipelineBuffer column.
公共方法 SetByte Assigns a byte to a PipelineBuffer column.
公共方法 SetBytes Assigns an array of bytes to a buffer column.
公共方法 SetDate Assigns a DateTime value to the PipelineBuffer column.
公共方法 SetDateTime Assigns a DateTime value to the PipelineBuffer column.
公共方法 SetDateTimeOffset Assigns a DateTimeOffset value to the PipelineBuffer column.
公共方法 SetDecimal Assigns a decimal to a buffer column.
公共方法 SetDouble Assigns a double to a PipelineBuffer column.
公共方法 SetEndOfRowset Notifies the PipelineBuffer that a component has finished adding rows to the buffer.
公共方法 SetErrorInfo Sets the error information for the current PipelineBuffer row.
公共方法 SetGuid Assigns a Guid to a buffer column.
公共方法 SetInt16 Assigns a 16-bit signed integer to a buffer column.
公共方法 SetInt32 Assigns a 32-bit signed integer to a buffer column.
公共方法 SetInt64 Assigns a 64-bit signed integer to a buffer column.
公共方法 SetNull Assigns nullNothingnullptrunitnull 引用（在 Visual Basic 中为 Nothing） to a buffer column.
公共方法 SetSByte Assigns a signed 8-bit integer to a buffer column.
公共方法 SetSingle Assigns a float to a buffer column.
公共方法 SetString Assigns a string to a buffer column.
公共方法 SetTime Assigns a TimeSpan value to the PipelineBuffer column.
公共方法 SetUInt16 Assigns an unsigned 16-bit integer to a buffer column.
公共方法 SetUInt32 Assigns an unsigned 32-bit integer to a buffer column.
公共方法 SetUInt64 Assigns an unsigned 64-bit integer to a buffer column.
公共方法 ToString （从 Object 继承。）

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注释

The PipelineBuffer is an in-memory two-dimensional data store containing rows and columns. It is created by the data flow task and supplied to managed data flow components during execution. The columns contained in a buffer are based on the columns in the IDTSOutputColumnCollection100 collections of the components in the graph.

Source components and components with asynchronous outputs receive a buffer for each of the output objects that are connected to a downstream component. These buffers are referred to as output buffers and do not contain rows. The component that receives the output buffer adds rows to the buffer and calls the SetEndOfRowset method when finished. This method sets the value of the EndOfRowset property to true on the final buffer. The data flow task then provides that buffer to the next component in the graph.

Transformation components with synchronous outputs and destination components receive PipelineBuffer objects in the ProcessInput method. The PipelineBuffer received in this method is an Input buffer and contains the rows that were added to by upstream components. This buffer is restricted and cannot be used to add or remove rows from the buffer.

The PipelineBuffer is written in managed code and supports managed data flow component developers by marshalling data between managed code and the underlying IDTSBuffer100 COM object.

For a complete list of Integration Services data types and the corresponding Get and Set methods of the PipelineBuffer class to use with each data type, see 在数据流中使用数据类型.

示例

The following example shows a transformation component that iterates the rows and columns of a PipelineBuffer in ProcessInput.

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


namespace Microsoft.Samples.SqlServer.Dts
{
   [DtsPipelineComponent
   (
   DisplayName="SampleComponent",
   ComponentType=ComponentType.Transform
   )]
   public class SampleComponent: PipelineComponent
   {
      public override void ProvideComponentProperties()
      {
         base.ProvideComponentProperties();

         ///Name the input and output add by the base class.
         ComponentMetaData.InputCollection[0].Name = "SampleInput";
         ComponentMetaData.OutputCollection[0].Name = "SampleOutput";
      }

      public override void ProcessInput(int inputID, PipelineBuffer buffer)
      {

      IDTSInput100 input = ComponentMetaData.InputCollection.GetObjectByID(inputID);

      while (buffer.NextRow())
      {
         foreach (IDTSInputColumn100 col in input.InputColumnCollection)
         {
            int colIndex = BufferManager.FindColumnByLineageID(input.Buffer,col.LineageID);
            object colData = buffer[colIndex];
            //TODO: Do something with the column data.
         }
      }
      }
   }
}

The following example shows a source component that adds rows to the output buffer in PrimeOutput.

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


namespace Microsoft.Samples.SqlServer.Dts
{
   [DtsPipelineComponent
   (
      DisplayName="SampleComponent",
      ComponentType=ComponentType.SourceComponent
)]
   public class SampleComponent: PipelineComponent
   {
      public override void PrimeOutput(int outputs, int[] outputIDs,PipelineBuffer[] buffers)
      {
         int rows = 100;
         PipelineBuffer buf = buffers[0];
         IDTSOutput100 output = ComponentMetaData.OutputCollection[0];
         Random rand = new Random();

         //Loop rows number of times
         for(int r = 0; r < rows; r++)
         {
            buf.AddRow();
            foreach( IDTSOutputColumn100 col in output.OutputColumnCollection)
            {
               int colIndex = BufferManager.FindColumnByLineageID( output.Buffer, col.LineageID);
               // Note, buffer columns containing binary large objects
               // can not be set using the following syntax. Instead,
               // the AddBlobData and SetBytes methods are used.
               buf[colIndex] = rand.Next();
            }
         }
         buf.SetEndOfRowset();
      }
   }
}

线程安全

此类型的任何公共 static（在 Visual Basic 中为 Shared） 成员都是线程安全的。不保证所有实例成员都是线程安全的。