ScriptBuffer.IsNull Method

  • 發行項

Returns a value that indicates whether the value of the specified column is null.

命名空間: Microsoft.SqlServer.Dts.Pipeline
組件: Microsoft.SqlServer.TxScript (in microsoft.sqlserver.txscript.dll)

語法

'宣告
Protected Function IsNull ( _
    ColumnIndex As Integer _
) As Boolean

protected bool IsNull (
    int ColumnIndex
)

protected:
bool IsNull (
    int ColumnIndex
)

protected boolean IsNull (
    int ColumnIndex
)

protected function IsNull (
    ColumnIndex : int
) : boolean

參數

  • ColumnIndex
    The index of the column.

傳回值

true if the value of the specified column is null; otherwise, false.

備註

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.

The developer does not have to use the IsNull method, because the derived classes contain a <ColumnX>_IsNull property for each column.

範例

The following sample code from the autogenerated BufferWrapper project item demonstrates how the Script component uses the IsNull method.

    Public Property [city_IsNull] As Boolean
        Get
            Return IsNull(1)
        End Get
        Set
            SetNull(1)
        End Set
    End Property

執行緒安全性

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.

平台

開發平台

如需受支援的平台清單，請參閱＜安裝 SQL Server 2005 的硬體和軟體需求＞。

目標平台

如需受支援的平台清單，請參閱＜安裝 SQL Server 2005 的硬體和軟體需求＞。

請參閱

參考

ScriptBuffer Class
ScriptBuffer Members
Microsoft.SqlServer.Dts.Pipeline Namespace