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ICommandStream::SetCommandStream

  • Статья

Sets the interface pointer of a stream object containing a command.

Syntax

HRESULT SetCommandStream (
   REFIID      riid,
   REFGUID     rguidDialect,
   IUnknown   *pCommandStream);

Parameters

  • riid
    [in]

    Specifies the type of stream object representing the command.

  • rguidDialect
    [in]

    Specifies the dialect of the command.

    If this parameter is set to DBGUID_DEFAULT, the provider uses its default dialect.

  • pCommandStream
    [in]

    Pointer to a stream object of a type specified by riid.

    If pCommandStream is a null pointer, the specification of the current command stream object is cleared and the command is put in an initial state.

Return Code

  • S_OK
    The method succeeded.

  • E_FAIL
    A provider-specific error occurred.

  • E_NOINTERFACE
    One of the following occurred:

    • The type of interface indicated by riid was not supported by the provider.

    • The riid specified did not match the type of stream object passed in *pCommandStream.

  • DB_E_DIALECTNOTSUPPORTED
    The provider did not support the dialect specified in rguidDialect.

  • DB_E_OBJECTOPEN
    The output stream returned by a previous call to ICommand::Execute is still open. Release that stream before calling this method.

Comments

ICommand::Execute uses the last command set by either ICommandStream::SetCommandStream or ICommandText::SetCommandText.

If the command is contained in a stream, ICommand::Execute uses the stream object specified at the time SetCommandStream was called, even if that stream object is subsequently modified by other means.

A provider may or may not support the same set of dialects (rguidDialect) on ICommandStream::SetCommandStream as are supported on ICommandText::SetCommandText.

See Also

Reference

ICommand::Execute

ICommandStream::GetCommandStream

ICommandText::SetCommandText