302 lines
9.7 KiB
C++
302 lines
9.7 KiB
C++
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//+---------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1995 - 2000.
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//
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// File: Distrib.hxx
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//
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// Contents: Base class for distributed rowset
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//
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// Classes: CDistributedRowset
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//
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// History: 23-Feb-95 KyleP Created
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//
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//----------------------------------------------------------------------------
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#pragma once
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#include <proprst.hxx>
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#include <impiunk.hxx>
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#include <accbase.hxx>
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#include <conpt.hxx>
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#include "rowman.hxx"
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#include "disnotfy.hxx"
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#include "bmkacc.hxx"
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//+---------------------------------------------------------------------------
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//
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// Class: CDistributedRowset
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//
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// Purpose: Base class for distributed rowset. Only implements
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// sequential methods.
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//
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// History: 05-Jun-95 KyleP Created.
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//
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//----------------------------------------------------------------------------
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class CDistributedRowset : public IRowset,
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public IColumnsInfo, public IRowsetIdentity,
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public IAccessor, public IRowsetInfo, public IConvertType,
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public IRowsetQueryStatus
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{
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public:
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//
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// IUnknown methods.
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//
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STDMETHOD(QueryInterface) ( THIS_ REFIID riid,
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LPVOID *ppiuk )
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{
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return _pControllingUnknown->QueryInterface(riid,ppiuk);
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}
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STDMETHOD_(ULONG, AddRef) (THIS) { return _pControllingUnknown->AddRef();}
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STDMETHOD_(ULONG, Release) (THIS) {return _pControllingUnknown->Release(); }
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//
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// IAccessor methods
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//
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STDMETHOD(AddRefAccessor) (HACCESSOR hAccessor,
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ULONG * pcRefCount);
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STDMETHOD(CreateAccessor) (DBACCESSORFLAGS dwAccessorFlags,
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DBCOUNTITEM cBindings,
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const DBBINDING rgBindings[],
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DBLENGTH cbRowSize,
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HACCESSOR * phAccessor,
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DBBINDSTATUS rgStatus[]);
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STDMETHOD(GetBindings) (HACCESSOR hAccessor,
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DBACCESSORFLAGS * pdwAccessorFlags,
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DBCOUNTITEM * pcBindings,
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DBBINDING * * prgBindings);
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STDMETHOD(ReleaseAccessor) (HACCESSOR hAccessor,
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ULONG * pcRefCount);
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//
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// IRowsetInfo methods
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//
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STDMETHOD(GetProperties) (const ULONG cPropertyIDSets,
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const DBPROPIDSET rgPropertyIDSets[],
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ULONG * pcProperties,
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DBPROPSET ** prgProperties);
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STDMETHOD(GetReferencedRowset) (DBORDINAL iOrdinal,
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REFIID riid,
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IUnknown ** ppReferencedRowset);
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//
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// IRowset methods
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//
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STDMETHOD(AddRefRows) (DBCOUNTITEM cRows,
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const HROW rghRows [],
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DBREFCOUNT rgRefCounts[],
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DBROWSTATUS rgRowStatus[]);
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STDMETHOD(GetData) (HROW hRow,
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HACCESSOR hAccessor,
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void * pData);
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STDMETHOD(GetNextRows) (HCHAPTER hChapter,
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DBROWOFFSET cRowsToSkip,
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DBROWCOUNT cRows,
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DBCOUNTITEM * pcRowsObtained,
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HROW ** pphRows);
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STDMETHOD(GetSpecification) (REFIID riid,
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IUnknown ** ppSpecification);
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STDMETHOD(ReleaseChapter) (HCHAPTER hChapter);
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STDMETHOD(ReleaseRows) (DBCOUNTITEM cRows,
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const HROW rghRows [],
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DBROWOPTIONS rgRowOptions[],
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DBREFCOUNT rgRefCounts[],
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DBROWSTATUS rgRowStatus[]);
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STDMETHOD(RestartPosition) (HCHAPTER hChapter);
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//
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// IColumnsInfo methods
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//
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STDMETHOD(GetColumnInfo) (DBORDINAL* pcColumns,
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DBCOLUMNINFO * * rrgInfo,
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WCHAR * * ppwchInfo );
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STDMETHOD(MapColumnIDs) (DBORDINAL cColumnIDs,
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const DBID rgColumnIDs[],
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DBORDINAL rgColumns[]);
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//
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// IRowsetIdentity methods
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//
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STDMETHOD(IsSameRow) ( HROW hThisRow, HROW hThatRow );
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//
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// IConvertType methods
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//
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STDMETHOD(CanConvert) ( DBTYPE wFromType,
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DBTYPE wToType,
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DBCONVERTFLAGS dwConvertFlags);
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//
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// IRowsetQueryStatus methods
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//
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STDMETHOD(GetStatus) (DWORD * pStatus);
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STDMETHOD(GetStatusEx) (DWORD * pStatus,
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DWORD * pcFilteredDocuments,
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DWORD * pcDocumentsToFilter,
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DBCOUNTITEM * pdwRatioFinishedDenominator,
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DBCOUNTITEM * pdwRatioFinishedNumerator,
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DBBKMARK cbBmk,
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const BYTE * pBmk,
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DBCOUNTITEM * piRowCurrent,
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DBCOUNTITEM * pcRowsTotal );
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//
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// Local methods
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//
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CDistributedRowset( IUnknown * pUnkOuter,
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IUnknown ** ppMyUnk,
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IRowset ** aChild,
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unsigned cChild,
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CMRowsetProps const & Props,
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unsigned cColumns,
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CAccessorBag & aAccessors,
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CCIOleDBError & DBErrorObj );
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protected:
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virtual ~CDistributedRowset();
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SCODE RealQueryInterface ( REFIID riid, LPVOID *ppiuk ); // used by _pControllingUnknown
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// in aggregation - does QI without delegating to outer unknown
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STDMETHOD(_GetNextRows) (HCHAPTER hChapter,
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DBROWOFFSET cRowsToSkip,
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DBROWCOUNT cRows,
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DBCOUNTITEM * pcRowsObtained,
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HROW ** pphRows) = 0;
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// This implementation includes all the extra columns that
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// we add for sorting, etc.
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STDMETHOD(_GetFullColumnInfo) (DBORDINAL* pcColumns,
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DBCOLUMNINFO * * rrgInfo,
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WCHAR * * ppwchInfo );
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CMutexSem _mutex;
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//
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// Event Notification Stuff...
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//
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// Array of child rowsets connection points
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XArray< XInterface<IConnectionPoint> > _xArrChildWatchCP;
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XArray< XInterface<IConnectionPoint> > _xArrChildAsynchCP;
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// Array of child rowsets watch regions
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XArray< XInterface<IRowsetWatchRegion> > _xArrChildRowsetWatchRegion;
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// Array of child rowsets advise cookies
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XArray<DWORD> _xArrWatchAdvise;
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XArray<DWORD> _xArrAsynchAdvise;
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// Distributed rowset connection point container which is
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// returned to the clients which try to connect to it
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XPtr<CConnectionPointContainer> _xServerCPC;
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// The sink which receives notifications from the child rowsets.
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// Also the Connection point to which the clients of distributed rowset
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// connect to.
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XPtr<CDistributedRowsetWatchNotify> _xChildNotify;
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// Distributed Bookmark Accessors
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XPtr<CDistributedBookmarkAccessor> _xDistBmkAcc;
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//
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// Child rowsets. One per point of distribution.
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//
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IRowset ** _aChild;
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unsigned _cChild;
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//
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// Number of columns originally given in Execute. We may add some for
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// management of the rowset, but these shouldn't be exposed to the client.
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//
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unsigned _cColumns;
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//
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// Distributed row manager, manages HROWs.
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//
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CHRowManager _RowManager;
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//
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// Cached info for IColumnsInfo::GetColumnInfo. This implementation needs
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// it. Why fetch it again for client?
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//
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DBORDINAL _cColInfo;
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DBCOLUMNINFO * _aColInfo;
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WCHAR * _awchInfo;
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//
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// Ordinal of bookmark column. Remove when ordinal 0 == bookmark.
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//
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DBORDINAL _iColumnBookmark;
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DBBKMARK _cbBookmark;
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//
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// Accessors created on rowset
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//
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CAccessorBag _aAccessors;
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//
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// Rowset Properties for base rowset.
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//
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CMRowsetProps _Props;
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CCIOleDBError & _DBErrorObj; // db error object
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IUnknown * _pControllingUnknown; // outer unknown
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friend class CImpIUnknown<CDistributedRowset>;
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CImpIUnknown<CDistributedRowset> _impIUnknown;
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DBROWCOUNT _cMaxResults; // The max row limit
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DBROWCOUNT _cFirstRows;
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DBROWCOUNT _iCurrentRow; // Used to limit rows in sequential rowsets
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private:
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friend class CScrollableSorted;
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void _SetupChildNotifications( BOOL fAsynchOnly );
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SCODE _SetupConnectionPointContainer( IRowset * pRowset, VOID * * ppiuk );
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};
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