IRowsetImpl Class

[アーティクル]
06/05/2017

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Provides an implementation of the IRowset interface.

Syntax

template <  
   class T,   
   class RowsetInterface,  
   class RowClass = CSimpleRow,  
   class MapClass = CAtlMap <  
      RowClass::KeyType,  
      RowClass*   
   >  
>  
class ATL_NO_VTABLE IRowsetImpl : public RowsetInterface

Parameters

T
Your class, derived from IRowsetImpl.

RowsetInterface
A class derived from IRowsetImpl.

RowClass
Storage unit for the HROW.

MapClass
Storage unit for all row handles held by the provider.

Members

Methods

AddRefRows	Adds a reference count to an existing row handle.
CreateRow	Called by GetNextRows to allocate a new HROW. Not called directly by user.
GetData	Retrieves data from the rowset's copy of the row.
GetDBStatus	Returns the status for the specified field.
GetNextRows	Fetches rows sequentially, remembering the previous position.
IRowsetImpl	The constructor. Not called directly by user.
RefRows	Called by AddRefRows and ReleaseRows. Not called directly by user.
ReleaseRows	Releases rows.
RestartPosition	Repositions the next fetch position to its initial position; that is, its position when the rowset was first created.
SetDBStatus	Sets the status flags for the specified field.

Data Members

m_bCanFetchBack	Indicates whether a provider supports backward fetching.
m_bCanScrollBack	Indicates whether a provider can have its cursor scroll backwards.
m_bReset	Indicates whether a provider has reset its cursor position. This has special meaning when scrolling backwards or fetching backwards in GetNextRows.
m_iRowset	An index to the rowset, representing the cursor.
m_rgRowHandles	A list of row handles.

Remarks

IRowset is the base rowset interface.

Requirements

Header: atldb.h

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