207 lines
7.1 KiB
C++
207 lines
7.1 KiB
C++
//+-------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1994 - 1999.
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//
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// File: colinfo.hxx
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//
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// Contents: Column information for Indexing Service rowsets
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//
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// Classes: CColumnsInfo
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//
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// History: 04 Feb 1995 AlanW Created
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//
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//--------------------------------------------------------------------------
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#pragma once
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#include <coldesc.hxx>
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#include <pidmap.hxx>
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class PQuery;
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class CTableColumnSet;
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//+---------------------------------------------------------------------------
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//
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// Class: CColumnsInfo
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//
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// Purpose: IColumnsInfo implementation for Indexing Service OLE-DB.
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//
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// Interface: IColumnsInfo, potentially IColumnsRowset
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//
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// History: 04 Feb 1995 AlanW Created
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//
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// Notes: Designed as a delegated OLE class. Includes methods
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// to help with managing columns in row buffers for
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// the IRowset implementation.
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//
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//----------------------------------------------------------------------------
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class CColumnsInfo : public IColumnsInfo
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#ifdef INCLUDE_COLUMNS_ROWSET_IMPLEMENTATION
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, public IColumnsRowset
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#endif // INCLUDE_COLUMNS_ROWSET_IMPLEMENTATION
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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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STDMETHOD_(ULONG, AddRef) (THIS);
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STDMETHOD_(ULONG, Release) (THIS);
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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 * * prgInfo,
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WCHAR * * ppStringsBuffer);
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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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#ifdef INCLUDE_COLUMNS_ROWSET_IMPLEMENTATION
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//
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// IColumnsRowset methods
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//
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STDMETHOD(GetAvailableColumns) (ULONG * pcSelections,
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DBID ** prgColumnSelection) /*const*/;
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STDMETHOD(GetColumnsRowset) (ULONG cSelections,
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DBID rgColumnSelection[],
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IRowset ** ppColRowset) /*const*/;
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#endif // INCLUDE_COLUMNS_ROWSET_IMPLEMENTATION
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//
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// Local methods.
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//
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CColumnsInfo( CColumnSet const & cols,
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CPidMapperWithNames const & pidmap,
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CCIOleDBError & ErrorObject,
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IUnknown & rUnknown,
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BOOL fSequential);
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CColumnsInfo( IUnknown & rUnknown,
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CCIOleDBError & ErrorObject,
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BOOL fNotPrepared=FALSE);
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virtual ~CColumnsInfo();
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void InitColumns( CColumnSet const & cols,
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CPidMapperWithNames const & pidmap,
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BOOL fSequential);
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void InitColumns( BOOL fNotPrepared );
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ULONG MapColumnID( DBID const * pColumnID );
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// Return number of columns
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ULONG GetColumnCount( void ) const
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{ return _cColumns; }
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// Return number of columns, including hidden columns
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ULONG GetHiddenColumnCount( void ) const
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{ return _cBoundColumns; }
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// Return column bindings for row buffers
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CTableColumnSet & GetColumnBindings( void ) const
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{ return *_pColumns; }
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// Return row width for row buffers
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ULONG GetRowWidth( void ) const
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{ return _cbRowWidth; }
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// Set column bindings for row buffers
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void SetColumnBindings(
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PQuery & rpQuery,
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ULONG hCursor,
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ULONG &obRowRefcount,
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ULONG &obRowWorkId,
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ULONG &obChaptRefcount,
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ULONG &obChaptWorkId);
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// Return standard column information for a column by column number
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const DBCOLUMNINFO & Get1ColumnInfo(
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ULONG iColumn);
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// Return TRUE if column ID is valid
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BOOL IsValidColumnId( ULONG iColumn )
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{ return iColumn == 0 ? ! _fSequential :
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iColumn <= GetColumnCount(); }
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// Return column number for row ID column and its standard info
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ULONG GetRowIdColumn( )
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{ return _iColRowId; };
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CFullPropSpec const * GetPropSpec( ULONG iColumn)
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{ return _pidmap.PidToName( iColumn ); }
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ULONG GetId() const { return _idUnique; }
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private:
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// Set columns.
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void _SetColumns( CColumnSet const & cols,
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CPidMapperWithNames const & pidmap,
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BOOL fSequential);
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// Find standard column information for a column and return it.
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static DBCOLUMNINFO const & _FindColumnInfo(
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const CFullPropSpec & rColumnID );
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// Return standard column information for the Row ID column
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static DBCOLUMNINFO const & _GetRowIdColumnInfo( void );
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//
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// Column information for common columns and pseudo-columns
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//
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struct SPropSetInfo {
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unsigned cProps;
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DBCOLUMNINFO const * aPropDescs;
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};
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ULONG _GetNewId()
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{
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return InterlockedIncrement((LONG *) &_nUnique);
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}
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static const SPropSetInfo aPropSets[];
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static const ULONG cPropSets;
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static ULONG _nUnique; // A unique number for identifying each
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// CColumnsInfo object.
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ULONG _idUnique; // Id of this CColumnsInfo object
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IUnknown & _rUnknown; // Controlling IUnknown
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ULONG _cbRowWidth; // Width of a row
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ULONG _cColumns; // number of columns in rowset, not
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// including bookmark or added row ID
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ULONG _cBoundColumns; // number of bound columns
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ULONG _iColRowId; // column number of Row ID column
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BOOL _fSequential; // sequential rowset?
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CPidMapperWithNames _pidmap; // pid mapper for column numbers/names
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CTableColumnSet * _pColumns; // Table column descriptions
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BOOL _fNotPrepared; // return DB_E_NOTPREPARED for a command object?
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BOOL _fChaptered; // chaptered rowset?
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CCIOleDBError & _ErrorObject; // The controlling unknown's error object
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};
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