/****************************************************************************** * $Id: ogridbselectlayer.cpp 10646 2007-01-18 02:38:10Z warmerdam $ * * Project:  OpenGIS Simple Features Reference Implementation * Purpose:  Implements OGRIDBSelectLayer class, layer access to the results *           of a SELECT statement executed via Open() *           (based on ODBC and PG drivers). * Author:   Oleg Semykin, oleg.semykin@gmail.com * ****************************************************************************** * Copyright (c) 2006, Oleg Semykin * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included * in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER * DEALINGS IN THE SOFTWARE. ****************************************************************************/#include "cpl_conv.h"#include "ogr_idb.h"CPL_CVSID("$Id: ogridbselectlayer.cpp 10646 2007-01-18 02:38:10Z warmerdam $");/************************************************************************//*                          OGRIDBSelectLayer()                         *//************************************************************************/OGRIDBSelectLayer::OGRIDBSelectLayer( OGRIDBDataSource *poDSIn,                                        ITCursor * poCurrIn ){    poDS = poDSIn;    iNextShapeId = 0;    nSRSId = -1;    poFeatureDefn = NULL;    poCurr = poCurrIn;    pszBaseQuery = CPLStrdup( poCurrIn->Command() );    BuildFeatureDefn( "SELECT", poCurr );}/************************************************************************//*                          ~OGRIDBSelectLayer()                          *//************************************************************************/OGRIDBSelectLayer::~OGRIDBSelectLayer(){    ClearQuery();}/************************************************************************//*                           ClearQuery()                           *//************************************************************************/void OGRIDBSelectLayer::ClearQuery(){    if( poCurr != NULL )    {        delete poCurr;        poCurr = NULL;    }}/************************************************************************//*                            GetQuery()                            *//************************************************************************/ITCursor *OGRIDBSelectLayer::GetQuery(){    if( poCurr == NULL )        ResetQuery();    return poCurr;}/************************************************************************//*                           ResetQuery()                           *//************************************************************************/OGRErr OGRIDBSelectLayer::ResetQuery(){    ClearQuery();    iNextShapeId = 0;    CPLDebug( "OGR_IDB", "Recreating statement." );    poCurr = new ITCursor( *poDS->GetConnection() );    if( poCurr->Prepare( pszBaseQuery ) &&        poCurr->Open( ITCursor::ReadOnly ) )        return OGRERR_NONE;    else    {        delete poCurr;        poCurr = NULL;        return OGRERR_FAILURE;    }}/************************************************************************//*                            ResetReading()                            *//************************************************************************/void OGRIDBSelectLayer::ResetReading(){    if( iNextShapeId != 0 )        ClearQuery();    OGRIDBLayer::ResetReading();}/************************************************************************//*                             GetFeature()                             *//************************************************************************/OGRFeature *OGRIDBSelectLayer::GetFeature( long nFeatureId ){    return OGRIDBLayer::GetFeature( nFeatureId );}/************************************************************************//*                           TestCapability()                           *//************************************************************************/int OGRIDBSelectLayer::TestCapability( const char * pszCap ){    return OGRIDBLayer::TestCapability( pszCap );}/************************************************************************//*                             GetExtent()                              *//*                                                                      *//*      Since SELECT layers currently cannot ever have geometry, we     *//*      can optimize the GetExtent() method!                            *//************************************************************************/OGRErr OGRIDBSelectLayer::GetExtent(OGREnvelope *, int ){    return OGRERR_FAILURE;}/************************************************************************//*                          GetFeatureCount()                           *//*                                                                      *//*      If a spatial filter is in effect, we turn control over to       *//*      the generic counter.  Otherwise we return the total count.      *//*      Eventually we should consider implementing a more efficient     *//*      way of counting features matching a spatial query.              *//************************************************************************/int OGRIDBSelectLayer::GetFeatureCount( int bForce ){    return OGRIDBLayer::GetFeatureCount( bForce );}