260 lines
8.7 KiB
C++
260 lines
8.7 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: RowComp.cxx
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//
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// Contents: Compares two rows.
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//
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// Classes: CRowComparator
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//
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// History: 05-Jun-95 KyleP Created
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// 14-JAN-97 KrishnaN Undefined CI_INETSRV and related changes
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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 <compare.hxx>
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#include "rowcomp.hxx"
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//+---------------------------------------------------------------------------
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//
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// Member: CRowComparator::CRowComparator, public
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//
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// Synopsis: Constructor.
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//
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// History: 05-Jun-95 KyleP Created.
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// 02-Feb-2000 KLam Removed END_CONSTRUCTION
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//
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//----------------------------------------------------------------------------
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CRowComparator::CRowComparator()
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: _aCmp(0),
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_aoColumn(0)
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{}
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//+---------------------------------------------------------------------------
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//
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// Member: CRowComparator::~CRowComparator, public
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//
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// Synopsis: Destructor.
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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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CRowComparator::~CRowComparator()
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{
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delete [] _aDir;
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delete [] _aCmp;
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delete [] _aoColumn;
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CRowComparator::Init, public
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//
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// Synopsis: Initializes comparator.
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//
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// Arguments: [sort] -- Sort specification.
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// [aBinding] -- Binding filled in here. Must have one
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// element per column in sort.
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// [aColumnInfo] -- Column metadata
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// [cColumnInfo] -- Size of [aColumnInfo]
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//
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// Returns: Size of buffer needed to satisfy binding.
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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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unsigned CRowComparator::Init( CSort const & sort,
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DBBINDING * aBinding,
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DBCOLUMNINFO const * aColumnInfo,
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DBORDINAL cColumnInfo )
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{
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_cColumn = sort.Count();
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_aDir = new int [_cColumn];
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_aoColumn = new unsigned [_cColumn];
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_aCmp = new FDBCmp [_cColumn];
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BYTE * pb = (BYTE *)0 + _cColumn * sizeof(CRowComparator::SColumnStatus);
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for ( unsigned i = 0; i < _cColumn; i++ )
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{
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// NTRAID#DB-NTBUG9-84053-2000/07/31-dlee Distributed queries could be faster if ordinals were used to reference columns
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for ( DBORDINAL j = 0; j < cColumnInfo; j++ )
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{
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if ( *(CFullPropSpec *)&aColumnInfo[j].columnid == sort.Get(i).GetProperty() )
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{
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RtlZeroMemory(&aBinding[i], sizeof (DBBINDING));
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aBinding[i].dwPart = DBPART_VALUE | DBPART_LENGTH | DBPART_STATUS;
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aBinding[i].iOrdinal = aColumnInfo[j].iOrdinal;
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aBinding[i].wType = aColumnInfo[j].wType;
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// (sizeof (CRowComparator::SColumnStatus) * i ) + offsetof (Status)
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aBinding[i].obStatus =
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(DBBYTEOFFSET) (ULONG_PTR)&((CRowComparator::SColumnStatus *)0)[i].Status;
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// (sizeof (CRowComparator::SColumnStatus) * i ) + offsetof (Length)
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aBinding[i].obLength =
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(DBBYTEOFFSET) (ULONG_PTR)&((CRowComparator::SColumnStatus *)0)[i].Length;
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//
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// Invert the meaning of _aCmp[i] for columns that are descending.
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//
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Win4Assert( QUERY_SORTDESCEND == 1 && QUERY_SORTXDESCEND == 3 );
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if ( sort.Get(i).GetOrder() & 1 )
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_aDir[i] = -1;
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else
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_aDir[i] = 1;
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_aCmp[i] = VariantCompare.GetDBComparator( (DBTYPEENUM)aColumnInfo[j].wType );
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if ( aColumnInfo[j].wType & DBTYPE_VECTOR )
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{
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_aoColumn[i] = (unsigned)((ULONG_PTR)AlignULONG( pb ));
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}
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else if ( aColumnInfo[j].wType & DBTYPE_ARRAY )
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{
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_aoColumn[i] = (unsigned)((ULONG_PTR)AlignULONG( pb ));
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}
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else
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{
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switch ( aColumnInfo[j].wType )
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{
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case DBTYPE_EMPTY:
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case DBTYPE_NULL:
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case DBTYPE_STR:
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case DBTYPE_BSTR:
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case DBTYPE_BYTES:
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_aoColumn[i] = (unsigned)((ULONG_PTR)pb);
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break;
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case DBTYPE_I2:
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case DBTYPE_UI2:
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case DBTYPE_BOOL:
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_aoColumn[i] = (unsigned)((ULONG_PTR)AlignUSHORT( pb ));
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break;
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case DBTYPE_I4:
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case DBTYPE_UI4:
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case DBTYPE_ERROR:
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_aoColumn[i] = (unsigned)((ULONG_PTR)AlignULONG( pb ));
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break;
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case DBTYPE_R4:
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_aoColumn[i] = (unsigned)((ULONG_PTR)AlignFloat( pb ));
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break;
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case DBTYPE_R8:
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case DBTYPE_DATE:
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_aoColumn[i] = (unsigned)((ULONG_PTR)AlignDouble( pb ));
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break;
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case DBTYPE_CY:
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case DBTYPE_I8:
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case DBTYPE_UI8:
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case DBTYPE_VARIANT:
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_aoColumn[i] = (unsigned)((ULONG_PTR)AlignLONGLONG( pb ));
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break;
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case DBTYPE_GUID:
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_aoColumn[i] = (unsigned)((ULONG_PTR)AlignGUID( pb ));
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break;
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case DBTYPE_WSTR:
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_aoColumn[i] = (unsigned)((ULONG_PTR)AlignWCHAR( pb ));
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break;
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default:
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vqDebugOut(( DEB_WARN,
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"Can't determine alignment for type %d\n",
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aColumnInfo[j].wType ));
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_aoColumn[i] = (unsigned)((ULONG_PTR)pb);
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break;
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}
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}
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aBinding[i].obValue = _aoColumn[i];
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aBinding[i].cbMaxLen = aColumnInfo[j].ulColumnSize;
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pb = (BYTE *) ULongToPtr( _aoColumn[i] ) + aColumnInfo[j].ulColumnSize;
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break;
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}
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}
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if ( j == cColumnInfo )
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{
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vqDebugOut(( DEB_ERROR, "Can't bind to sort column.\n" ));
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Win4Assert( !"Can't bind to sort column." );
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THROW( CException(E_FAIL) );
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}
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}
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vqDebugOut(( DEB_ITRACE, "CRowComparator: Allocated %d byte buffer for comparisons\n", pb ));
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return (unsigned)((ULONG_PTR)pb);
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CRowComparator::IsLT, public
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//
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// Synopsis: Less-than comparator
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//
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// Arguments: [pbRow1] -- Data for row 1.
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// [cbRow1] -- Size of [pbRow1]
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// [IndexRow1] -- Used to break ties.
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// [pbRow2] -- Data for row 2.
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// [cbRow2] -- Size of [pbRow2]
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// [IndexRow2] -- Used to break ties.
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//
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// Returns: TRUE of row1 < row2.
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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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BOOL CRowComparator::IsLT( BYTE * pbRow1,
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ULONG cbRow1,
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int IndexRow1,
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BYTE * pbRow2,
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ULONG cbRow2,
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int IndexRow2 )
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{
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int iCmp = 0;
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CRowComparator::SColumnStatus * aColStatus1 = (CRowComparator::SColumnStatus *)pbRow1;
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CRowComparator::SColumnStatus * aColStatus2 = (CRowComparator::SColumnStatus *)pbRow2;
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for ( unsigned i = 0; i < _cColumn; i++ )
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{
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//
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// Verify field was successfully retrieved.
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//
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if ( FAILED(aColStatus1[i].Status) || FAILED(aColStatus2[i].Status) )
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break;
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iCmp = _aDir[i] * _aCmp[i]( pbRow1 + _aoColumn[i],
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(ULONG) aColStatus1[i].Length, // Length will never be 4Gb
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pbRow2 + _aoColumn[i],
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(ULONG)aColStatus2[i].Length ); // Length will never be 4Gb
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if ( 0 != iCmp )
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break;
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}
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if ( 0 == iCmp )
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return( IndexRow1 < IndexRow2 );
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else
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return( iCmp < 0 );
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}
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