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121 lines
3.6 KiB
C++
121 lines
3.6 KiB
C++
/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2025 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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#ifndef POSTGIS_CURSORRESULTSET_HPP
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#define POSTGIS_CURSORRESULTSET_HPP
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#include <mapnik/debug.hpp>
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#include "connection.hpp"
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#include "resultset.hpp"
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class CursorResultSet : public IResultSet,
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private mapnik::util::noncopyable
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{
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public:
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CursorResultSet(std::shared_ptr<Connection> const& conn, std::string cursorName, int fetch_count)
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: conn_(conn),
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cursorName_(cursorName),
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fetch_size_(fetch_count),
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is_closed_(false)
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{
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getNextResultSet();
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}
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virtual ~CursorResultSet() { close(); }
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virtual void close()
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{
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if (!is_closed_)
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{
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rs_.reset();
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std::ostringstream s;
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s << "CLOSE " << cursorName_;
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MAPNIK_LOG_DEBUG(postgis) << "postgis_cursor_resultset: " << s.str();
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conn_->execute(s.str());
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is_closed_ = true;
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conn_.reset();
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}
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}
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virtual int getNumFields() const { return rs_->getNumFields(); }
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virtual bool next()
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{
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if (rs_->next())
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{
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return true;
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}
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else if (rs_->size() == 0)
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{
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close();
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return false;
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}
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else
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{
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getNextResultSet();
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return rs_->next();
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}
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}
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virtual char const* getFieldName(int index) const { return rs_->getFieldName(index); }
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virtual int getFieldLength(int index) const { return rs_->getFieldLength(index); }
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virtual int getFieldLength(char const* name) const { return rs_->getFieldLength(name); }
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virtual int getTypeOID(int index) const { return rs_->getTypeOID(index); }
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virtual int getTypeOID(char const* name) const { return rs_->getTypeOID(name); }
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virtual bool isNull(int index) const { return rs_->isNull(index); }
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virtual char const* getValue(int index) const { return rs_->getValue(index); }
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virtual char const* getValue(char const* name) const { return rs_->getValue(name); }
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private:
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void getNextResultSet()
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{
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std::ostringstream s;
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s << "FETCH FORWARD " << fetch_size_ << " FROM " << cursorName_;
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MAPNIK_LOG_DEBUG(postgis) << "postgis_cursor_resultset: " << s.str();
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rs_ = conn_->executeQuery(s.str());
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is_closed_ = false;
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MAPNIK_LOG_DEBUG(postgis) << "postgis_cursor_resultset: FETCH result (" << cursorName_ << "): " << rs_->size()
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<< " rows";
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}
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std::shared_ptr<Connection> conn_;
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std::string cursorName_;
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std::shared_ptr<ResultSet> rs_;
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int fetch_size_;
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bool is_closed_;
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};
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#endif // POSTGIS_CURSORRESULTSET_HPP
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