83 lines
2 KiB
C++
83 lines
2 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 - 1997.
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//
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// File: SeqExec.hxx
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//
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// Contents: Sequential Query execution class
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//
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// Classes: CQSeqExecute
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//
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// History: 22-Jan-95 DwightKr Created
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//
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//----------------------------------------------------------------------------
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#pragma once
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#include <tblalloc.hxx>
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#include <gencur.hxx>
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//+---------------------------------------------------------------------------
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//
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// Class: CQSeqExecute
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//
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// Purpose: Executes a single query
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//
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// Interface:
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//
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// History: 21-Jan-95 DwightKr Created.
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//
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// Notes: The CQSeqExecute class is responsible for fully processing
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// a single sequential query.
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//
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//----------------------------------------------------------------------------
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class CQSeqExecute
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{
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public:
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CQSeqExecute( XQueryOptimizer & qopt );
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SCODE GetRows( CTableColumnSet const & OutColumns,
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unsigned & cRowsToSkip,
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CGetRowsParams & GetParams );
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DWORD Status()
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{
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return _status;
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}
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BOOL FetchDeferredValue( WORKID wid,
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CFullPropSpec const & ps,
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PROPVARIANT & var );
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protected:
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CQSeqExecute( CTimeLimit & TimeLim );
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SCODE GetRowInfo( CTableColumnSet const & OutColumns,
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CGetRowsParams & GetParams,
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BYTE * pRowDataBuf );
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BOOL CheckExecutionTime( void );
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ULONG _status;
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BOOL _fCursorOnNewObject;
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// this is an array of LONGLONGs to force 8-byte alignment
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LONGLONG _abValueBuf[ cbMaxNonDeferredValueSize / sizeof LONGLONG ];
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XGenericCursor _objs;
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BOOL _fAbort; // Set to true if query is to be aborted
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CTimeLimit _TimeLimit; // Execution time limit
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ULONG _cRowsToReturnMax; // Result set size limit
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XQueryOptimizer _xOpt; // Query optimizer
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};
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