Класс ScriptBuffer

Serves as the base class for the read-only classes representing the input and the outputs that are generated by the Script component in the BufferWrapper project item in a Script component project.

Иерархия наследования

System.Object
  Microsoft.SqlServer.Dts.Pipeline.ScriptBuffer

Пространство имен:  Microsoft.SqlServer.Dts.Pipeline
Сборка:  Microsoft.SqlServer.TxScript (в Microsoft.SqlServer.TxScript.dll)

Синтаксис

'Декларация
Public Class ScriptBuffer
'Применение
Dim instance As ScriptBuffer

public class ScriptBuffer

public ref class ScriptBuffer

type ScriptBuffer =  class end

public class ScriptBuffer

Тип ScriptBuffer обеспечивает доступ к следующим элементам.

Конструкторы

	Имя	Описание
	ScriptBuffer	Initializes a new instance of the ScriptBuffer class.

В начало

Свойства

	Имя	Описание
	Item	Gets or sets the value of a column in the buffer by using its index in the array of buffer column indexes.

В начало

Методы

	Имя	Описание
	AddRow	Adds an empty new row to the data flow buffer.
	DirectRow	Directs a row to the specified output when a component has more than one available output.
	EndOfRowset	Returns a value that indicates whether the end of the rows in a buffer has been reached.
	Equals	(Производный от Object.)
	Finalize	(Производный от Object.)
	GetHashCode	(Производный от Object.)
	GetType	(Производный от Object.)
	IsNull	Returns a value that indicates whether the value of the specified column is nullпустая ссылка (Nothing в Visual Basic).
	MemberwiseClone	(Производный от Object.)
	NextRow	Tries to move to the next available row in the buffer and returns a value that indicates whether another row was available.
	SetEndOfRowset	Indicates to the data flow that no more rows will be added to the output buffer.
	SetNull	Makes the value of the specified column nullпустая ссылка (Nothing в Visual Basic).
	ToString	(Производный от Object.)

В начало

Поля

	Имя	Описание
	Buffer	The script buffer.
	BufferColumnIndexes	An array of column indexes.

В начало

Замечания

The ScriptBuffer class serves as the base class for the read-only classes representing the input and the outputs that are generated by the Script component in the BufferWrapper project item in a Script component project. The classes in the BufferWrapper project item provide the developer with a set of methods for working with the data flow buffers, as well as typed accessor properties for each column in the buffers.

The Script component developer does not use the ScriptBuffer class directly, but indirectly, through the derived classes in the BufferWrapper project item that represent the component's input and outputs.

For more information, see Кодирование и отладка компонента скрипта and Основные сведения о модели объектов компонента скрипта.

Примеры

The following code sample from Создание асинхронного преобразования с помощью компонента скрипта demonstrates several methods and properties of the ScriptBuffer class, including AddRow, NextRow, EndOfRowset, and SetEndOfRowset.

Public Class ScriptMain
    Inherits UserComponent

    Private myRedmondAddressCount As Integer

    Public Overrides Sub CreateNewOutputRows()

        MySummaryOutputBuffer.AddRow()

    End Sub

    Public Overrides Sub MyAddressInput_ProcessInput(ByVal Buffer As MyAddressInputBuffer)

        While Buffer.NextRow()
            MyAddressInput_ProcessInputRow(Buffer)
        End While

        If Buffer.EndOfRowset Then
            MyAddressOutputBuffer.SetEndOfRowset()
            MySummaryOutputBuffer.MyRedmondCount = myRedmondAddressCount
            MySummaryOutputBuffer.SetEndOfRowset()
        End If

    End Sub

    Public Overrides Sub MyAddressInput_ProcessInputRow(ByVal Row As MyAddressInputBuffer)

        With MyAddressOutputBuffer
            .AddRow()
            .AddressID = Row.AddressID
            .City = Row.City
        End With

        If Row.City.ToUpper = "REDMOND" Then
            myRedmondAddressCount += 1
        End If

    End Sub

End Class

Безопасность многопоточности

Любые открытые статический (Shared в Visual Basic) элементы этого типа потокобезопасны. Потокобезопасность с элементами экземпляров не гарантируется.

См. также

Справочник

Пространство имен Microsoft.SqlServer.Dts.Pipeline