ScriptBuffer.IsNull Method

Статья
12/15/2008

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

Пространство имен: Microsoft.SqlServer.Dts.Pipeline
Сборка: Microsoft.SqlServer.TxScript (in microsoft.sqlserver.txscript.dll)

Синтаксис

'Декларация
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

Параметры

ColumnIndex
The index of the column.

Возвращаемое значение

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

Замечания

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.

Пример

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

Синхронизация потоков

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.

Платформы

Платформы разработки

Список поддерживаемых платформ см. в разделе Hardware and Software Requirements for Installing SQL Server 2005.

Целевые платформы