Classe 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.
Hierarquia de herança
System.Object
Microsoft.SqlServer.Dts.Pipeline.ScriptBuffer
Namespace: Microsoft.SqlServer.Dts.Pipeline
Assembly: Microsoft.SqlServer.TxScript (em Microsoft.SqlServer.TxScript.dll)
Sintaxe
'Declaração
Public Class ScriptBuffer
'Uso
Dim instance As ScriptBuffer
public class ScriptBuffer
public ref class ScriptBuffer
type ScriptBuffer = class end
public class ScriptBuffer
O tipo ScriptBuffer expõe os membros a seguir.
Construtores
Nome | Descrição | |
---|---|---|
ScriptBuffer | Initializes a new instance of the ScriptBuffer class. |
Início
Propriedades
Nome | Descrição | |
---|---|---|
Item | Gets or sets the value of a column in the buffer by using its index in the array of buffer column indexes. |
Início
Métodos
Nome | Descrição | |
---|---|---|
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 | (Herdado de Object.) | |
Finalize | (Herdado de Object.) | |
GetHashCode | (Herdado de Object.) | |
GetType | (Herdado de Object.) | |
IsNull | Returns a value that indicates whether the value of the specified column is nulluma referência nula (Nothing no Visual Basic). | |
MemberwiseClone | (Herdado de 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 nulluma referência nula (Nothing no Visual Basic). | |
ToString | (Herdado de Object.) |
Início
Campos
Nome | Descrição | |
---|---|---|
Buffer | The script buffer. | |
BufferColumnIndexes | An array of column indexes. |
Início
Comentários
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 Codificando e depurando o componente Script and Compreendendo o Component Object Model Script.
Exemplos
The following code sample from Criando uma transformação assíncrona com o componente Script 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
Segurança de thread
Qualquer membro público static (Shared no Visual Basic) desse tipo é seguro para threads. Não há garantia de que qualquer membro de instância seja seguro para threads.