ScriptBuffer 類別
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.
繼承階層
System. . :: . .Object
Microsoft.SqlServer.Dts.Pipeline..::..ScriptBuffer
命名空間: Microsoft.SqlServer.Dts.Pipeline
組件: Microsoft.SqlServer.TxScript (在 Microsoft.SqlServer.TxScript.dll 中)
語法
'宣告
Public Class ScriptBuffer
'用途
Dim instance As ScriptBuffer
public class ScriptBuffer
public ref class ScriptBuffer
type ScriptBuffer = class end
public class ScriptBuffer
ScriptBuffer 型別公開下列成員。
屬性
名稱 | 說明 | |
---|---|---|
Item | Gets or sets the value of a column in the buffer by using its index in the array of buffer column indexes. |
上層
方法
名稱 | 說明 | |
---|---|---|
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 | (繼承自 Object。) | |
Finalize | (繼承自 Object。) | |
GetHashCode | (繼承自 Object。) | |
GetType | (繼承自 Object。) | |
IsNull | Returns a value that indicates whether the value of the specified column is nullNothingnullptrunitnull 參考 (在 Visual Basic 中為 Nothing). | |
MemberwiseClone | (繼承自 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 nullNothingnullptrunitnull 參考 (在 Visual Basic 中為 Nothing). | |
ToString | (繼承自 Object。) |
上層
備註
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 指令碼元件的程式碼撰寫和偵錯 and 了解指令碼元件物件模型.
範例
The following code sample from 使用指令碼元件建立非同步轉換 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
執行緒安全性
這個型別的任何公用 static (在 Visual Basic 中為 Shared) 成員都是執行緒安全的。並不是所有的執行個體成員都保證可以用於所有的執行緒。