IDTSBuffer90.LockData Method

Locks the data in an IDTSBuffer90.

Пространство имен: Microsoft.SqlServer.Dts.Pipeline.Wrapper
Сборка: Microsoft.SqlServer.DTSPipelineWrap (in microsoft.sqlserver.dtspipelinewrap.dll)

Синтаксис

'Декларация
Sub LockData

void LockData ()

void LockData ()

void LockData ()

function LockData ()

Замечания

Before accessing the data in an IDTSBuffer90, data flow components should call the LockData method of the buffer. This method locks the data in the buffer in memory and prevents the IDTSBufferManager90 from swapping it out to disk.

In low memory situations, the IDTSBufferManager90 attempts to create memory space by swapping unlocked buffers out of memory and to disk. Attempts to access the data within a buffer fail on buffers that have not been locked. However, calls to get data about the buffer itself, such as GetRowCount or GetColumnCount, succeed because only the actual data within the buffer is swapped to disk, not the descriptive data about the state or type of the buffer.

Managed data flow component developers do not need to call this method because the managed PipelineBuffer automatically locks and unlocks the buffer.

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

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

См. также

Справочник

IDTSBuffer90 Interface
IDTSBuffer90 Members
Microsoft.SqlServer.Dts.Pipeline.Wrapper Namespace