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452 lines
13 KiB
452 lines
13 KiB
//+---------------------------------------------------------------------------
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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: SeqExec.cxx
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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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#include <pch.cxx>
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#pragma hdrstop
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#include <query.hxx>
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#include "seqexec.hxx"
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//+---------------------------------------------------------------------------
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//
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// Member: CQSeqExecute::CQSeqExecute, public
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//
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// Synopsis: Start a query
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//
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// Arguments: [qopt] -- Query optimizer
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//
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// History: 20-Jan-95 DwightKr Created
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//
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//----------------------------------------------------------------------------
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CQSeqExecute::CQSeqExecute( XQueryOptimizer & xOpt )
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: _status(STAT_BUSY),
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_fCursorOnNewObject( TRUE ),
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_fAbort( FALSE ),
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_TimeLimit( xOpt->GetTimeLimit() ),
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_cRowsToReturnMax( xOpt->MaxResults() ),
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_xOpt( xOpt )
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{
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Win4Assert( !_xOpt->IsMultiCursor() && _xOpt->IsFullySorted() );
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if ( 0 != _xOpt->FirstRows() )
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_cRowsToReturnMax = _xOpt->FirstRows();
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if (_cRowsToReturnMax == 0)
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_cRowsToReturnMax = 0xFFFFFFFF;
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TRY
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{
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_objs.Set( _xOpt->QueryNextCursor( _status, _fAbort ) );
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}
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CATCH(CException, e)
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{
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if ( e.GetErrorCode() == QUERY_E_TIMEDOUT )
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{
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//
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// Execution time limit has been exceeded, not a catastrophic error
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//
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_status = ( STAT_DONE |
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QUERY_RELIABILITY_STATUS( Status() ) |
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STAT_TIME_LIMIT_EXCEEDED );
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//
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// Update local copy of execution time
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//
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_TimeLimit.SetExecutionTime( 0 );
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}
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else
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RETHROW();
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}
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END_CATCH
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if ( !_objs.IsNull() )
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{
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_objs->Quiesce();
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_objs->SwapOutWorker();
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}
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} //CQSeqExecute
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//+---------------------------------------------------------------------------
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//
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// Member: CQSeqExecute::GetRows, public
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//
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// Synopsis: Get the next set of rows from a query
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//
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// History: 20-Jan-95 DwightKr Created.
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//
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//----------------------------------------------------------------------------
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SCODE CQSeqExecute::GetRows( CTableColumnSet const & OutColumns,
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unsigned &cRowsToSkip,
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CGetRowsParams & GetParams )
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{
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if ( _TimeLimit.IsTimedOut() )
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return DB_S_STOPLIMITREACHED;
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if ( ( STAT_DONE == QUERY_FILL_STATUS( _status ) ) ||
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_objs.IsNull() )
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return DB_S_ENDOFROWSET;
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_TimeLimit.SetBaselineTime( );
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SCODE scResult = S_OK;
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TRY
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{
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//
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// If this is not the first call to GetRows, then advance to the
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// next object. We've already seen the current object.
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//
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if ( !_fCursorOnNewObject )
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_objs->NextWorkId();
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//
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// Skip the # of rows specified
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//
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for ( WORKID widEnd = _objs->WorkId();
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cRowsToSkip > 0 && widEnd != widInvalid;
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widEnd = _objs->NextWorkId() )
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{
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cRowsToSkip--;
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if (_cRowsToReturnMax == 0)
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{
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vqDebugOut(( DEB_IWARN,
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"Query row limit exceeded for %08x\n",
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this ));
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scResult = DB_S_ENDOFROWSET;
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widEnd = widInvalid;
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break;
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}
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_cRowsToReturnMax--;
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if ( CheckExecutionTime() )
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{
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scResult = DB_S_STOPLIMITREACHED;
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widEnd = widInvalid;
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break;
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}
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}
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//
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// Get the # of rows requested
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//
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BYTE * pbBuf = 0;
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while ( widEnd != widInvalid )
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{
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if ( _cRowsToReturnMax == 0 )
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{
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vqDebugOut(( DEB_IWARN,
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"Query row limit exceeded for %08x\n",
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this ));
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scResult = DB_S_ENDOFROWSET;
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break;
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}
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if ( ( 0 == ( GetParams.RowsTransferred() % 5 ) ) &&
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( CheckExecutionTime() ) )
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{
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scResult = DB_S_STOPLIMITREACHED;
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break;
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}
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if ( 0 == pbBuf )
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pbBuf = (BYTE *) GetParams.GetFixedVarAllocator().AllocFixed();
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scResult = GetRowInfo( OutColumns, GetParams, pbBuf );
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//
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// If object is deleted, just skip to the next one and re-use
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// the row buffer space from the GetParam's allocator.
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//
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if (scResult == S_OK)
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{
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// fetched a row -- record that fact
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GetParams.IncrementRowCount();
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Win4Assert(_cRowsToReturnMax != 0);
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_cRowsToReturnMax--;
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pbBuf = 0;
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}
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else
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{
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if ( scResult == STATUS_FILE_DELETED )
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scResult = S_OK;
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else
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break;
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}
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// Do we need to get another?
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if ( 0 == GetParams.RowsToTransfer() )
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break;
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widEnd = _objs->NextWorkId();
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}
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if ( widEnd == widInvalid )
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{
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scResult = cRowsToSkip ? DB_E_BADSTARTPOSITION : DB_S_ENDOFROWSET;
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_status = STAT_DONE | QUERY_RELIABILITY_STATUS(_status);
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}
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}
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CATCH( CException, e )
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{
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_fCursorOnNewObject = TRUE;
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//
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// A common error returned here is E_OUTOFMEMORY. This needs
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// to be translated and passed back to the caller to be
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// handled appropriately. It is a non-fatal error.
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//
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if ( STATUS_BUFFER_TOO_SMALL == e.GetErrorCode() )
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{
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if ( GetParams.RowsTransferred() > 0 )
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scResult = DB_S_BLOCKLIMITEDROWS;
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else
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scResult = STATUS_BUFFER_TOO_SMALL;
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}
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else if ( QUERY_E_TIMEDOUT == e.GetErrorCode() )
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{
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//
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// Execution time limit has been exceeded, not a catastrophic error
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//
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_status = ( STAT_DONE |
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QUERY_RELIABILITY_STATUS( Status() ) |
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STAT_TIME_LIMIT_EXCEEDED );
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scResult = DB_S_STOPLIMITREACHED;
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//
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// Update local copy of execution time
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//
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_TimeLimit.SetExecutionTime( 0 );
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}
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else
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{
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vqDebugOut(( DEB_ERROR,
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"Exception 0x%x caught in CQSeqExecute::GetRows\n",
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e.GetErrorCode() ));
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scResult = e.GetErrorCode();
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}
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}
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END_CATCH
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_objs->Quiesce();
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_objs->SwapOutWorker();
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if ( S_OK == scResult )
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_fCursorOnNewObject = FALSE;
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return scResult;
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} //GetRows
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//+---------------------------------------------------------------------------
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//
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// Member: CQSeqExecute::GetRowInfo, private
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//
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// Synopsis: Get the next row from a query without advancing the cursor
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//
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// History: 20-Jan-95 DwightKr Created.
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//
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//----------------------------------------------------------------------------
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SCODE CQSeqExecute::GetRowInfo(
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CTableColumnSet const & OutColumns,
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CGetRowsParams & GetParams,
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BYTE * pbBuf )
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{
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SCODE scResult = S_OK;
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//
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// Get the current row from the cursor
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//
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Win4Assert( !_objs.IsNull() );
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CRetriever & obj = _objs.GetReference();
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//
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// Transfer each of the columns to the output buffer
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//
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for ( unsigned iColumn=0;
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iColumn < OutColumns.Size();
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iColumn++ )
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{
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CTableColumn & rColumn = *OutColumns.Get(iColumn);
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Win4Assert( VT_EMPTY != rColumn.GetStoredType() );
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ULONG cbBuf = sizeof _abValueBuf;
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CTableVariant* pVarnt = (CTableVariant *) &_abValueBuf;
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RtlZeroMemory( pVarnt, sizeof CTableVariant );
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GetValueResult eGvr = obj.GetPropertyValue( rColumn.PropId,
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pVarnt,
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&cbBuf );
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CTableColumn::StoreStatus stat = CTableColumn::StoreStatusOK;
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XPtr<CTableVariant> sVarnt(0);
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// Really large values must be deferred in cisvc due to the limit on
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// the size of named pipe buffers.
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if ( ( GVRNotEnoughSpace == eGvr ) &&
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( cbBuf <= cbMaxNonDeferredValueSize ) )
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{
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sVarnt.Set( (CTableVariant *) new BYTE[cbBuf] ); // Smart pointer
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pVarnt = sVarnt.GetPointer();
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eGvr = obj.GetPropertyValue( rColumn.PropId, pVarnt, &cbBuf );
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}
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if ( GVRSuccess != eGvr )
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{
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if ( GVRNotAvailable == eGvr )
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{
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pVarnt->vt = VT_EMPTY;
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stat = CTableColumn::StoreStatusNull;
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}
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else if ( GVRSharingViolation == eGvr )
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{
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pVarnt->vt = VT_EMPTY;
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stat = CTableColumn::StoreStatusNull;
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// don't set this until it's implemented everywhere
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//_status |= STAT_SHARING_VIOLATION;
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}
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else if ( GVRNotEnoughSpace == eGvr )
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{
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stat = CTableColumn::StoreStatusDeferred;
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}
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}
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if ( rColumn.IsLengthStored() )
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rColumn.SetLength( pbBuf, cbBuf );
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Win4Assert( rColumn.IsValueStored() );
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if ( ( GVRSuccess == eGvr ) ||
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( GVRNotAvailable == eGvr ) ||
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( GVRSharingViolation == eGvr ) )
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{
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BYTE *pRowColDataBuf = pbBuf + rColumn.GetValueOffset();
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DBLENGTH ulTemp;
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DBSTATUS dbStatus = pVarnt->CopyOrCoerce(
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pRowColDataBuf,
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rColumn.GetValueSize(),
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rColumn.GetStoredType(),
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ulTemp,
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GetParams.GetVarAllocator() );
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if ( DBSTATUS_S_OK != dbStatus )
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{
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vqDebugOut(( DEB_ITRACE,
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"Sequential query column 0x%x copy failed "
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"srcvt 0x%x, workid 0x%x, dbstat 0x%x\n",
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iColumn,
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pVarnt->vt,
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_objs->WorkId(),
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dbStatus ));
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stat = CTableColumn::StoreStatusNull;
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}
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}
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else if ( GVRNotEnoughSpace != eGvr ) // deferred
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{
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vqDebugOut(( DEB_WARN,
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"Sequential fetch of property for row (wid = 0x%x) failed %d\n",
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_objs->WorkId(), eGvr ));
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scResult = E_FAIL;
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break;
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}
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Win4Assert( rColumn.IsStatusStored() );
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rColumn.SetStatus( pbBuf, stat );
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}
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return scResult;
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} //GetRowInfo
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//+-------------------------------------------------------------------------
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//
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// Member: CQSeqExecute::CheckExecutionTime, private
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//
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// Synopsis: Check for CPU time limit exceeded
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//
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// Arguments: NONE
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//
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// Returns: TRUE if execution time limit exceeded.
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//
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// Notes: The CPU time spent executing a query since the last
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// check is computed and compared with the remaining time
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// in the CPU time limit. If the time limit is exceeded,
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// the query is aborted and a status bit is set indicating
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// that. Otherwise, the remaining time and the input time
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// snapshots are updated.
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//
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// History: 08 Apr 96 AlanW Created
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//
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//--------------------------------------------------------------------------
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BOOL CQSeqExecute::CheckExecutionTime( void )
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{
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if ( _TimeLimit.CheckExecutionTime() )
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{
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vqDebugOut(( DEB_IWARN,
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"Execution time limit exceeded for %08x\n",
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this ));
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_status = ( STAT_DONE |
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QUERY_RELIABILITY_STATUS( Status() ) |
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STAT_TIME_LIMIT_EXCEEDED );
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return TRUE;
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}
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return FALSE;
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}
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//+-------------------------------------------------------------------------
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//
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// Member: CQSeqExecute::FetchDeferredValue
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//
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// Synopsis: Checks if read access is permitted
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//
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// Arguments: [wid] - Workid
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// [ps] -- Property to be fetched
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// [var] -- Property returned here
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//
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// History: 12-Jan-97 SitaramR Created
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//
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//--------------------------------------------------------------------------
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BOOL CQSeqExecute::FetchDeferredValue( WORKID wid,
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CFullPropSpec const & ps,
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PROPVARIANT & var )
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{
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return _xOpt->FetchDeferredValue( wid, ps, var );
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}
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