150 lines
3.5 KiB
C++
150 lines
3.5 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) 2021 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_RESULTSET_HPP
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#define POSTGIS_RESULTSET_HPP
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extern "C" {
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#include "libpq-fe.h"
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}
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class IResultSet
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{
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public:
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//virtual IResultSet& operator=(const IResultSet& rhs) = 0;
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virtual ~IResultSet() {}
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virtual void close() = 0;
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virtual int getNumFields() const = 0;
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virtual bool next() = 0;
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virtual const char* getFieldName(int index) const = 0;
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virtual int getFieldLength(int index) const = 0;
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virtual int getFieldLength(const char* name) const = 0;
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virtual int getTypeOID(int index) const = 0;
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virtual int getTypeOID(const char* name) const = 0;
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virtual bool isNull(int index) const = 0;
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virtual const char* getValue(int index) const = 0;
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virtual const char* getValue(const char* name) const = 0;
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};
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class ResultSet : public IResultSet, private mapnik::util::noncopyable
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{
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public:
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ResultSet(PGresult *res)
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: res_(res),
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pos_(-1)
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{
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numTuples_ = PQntuples(res_);
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}
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virtual void close()
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{
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PQclear(res_);
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res_ = 0;
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}
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virtual ~ResultSet()
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{
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PQclear(res_);
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}
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virtual int getNumFields() const
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{
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return PQnfields(res_);
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}
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int pos() const
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{
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return pos_;
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}
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int size() const
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{
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return numTuples_;
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}
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virtual bool next()
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{
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return (++pos_ < numTuples_);
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}
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virtual const char* getFieldName(int index) const
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{
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return PQfname(res_, index);
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}
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virtual int getFieldLength(int index) const
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{
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return PQgetlength(res_, pos_, index);
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}
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virtual int getFieldLength(const char* name) const
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{
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int col = PQfnumber(res_, name);
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if (col >= 0)
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{
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return PQgetlength(res_, pos_, col);
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}
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return 0;
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}
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virtual int getTypeOID(int index) const
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{
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return PQftype(res_, index);
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}
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virtual int getTypeOID(const char* name) const
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{
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int col = PQfnumber(res_, name);
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if (col >= 0)
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{
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return PQftype(res_, col);
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}
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return 0;
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}
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virtual bool isNull(int index) const
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{
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return static_cast<bool>(PQgetisnull(res_, pos_, index));
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}
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virtual const char* getValue(int index) const
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{
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return PQgetvalue(res_, pos_, index);
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}
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virtual const char* getValue(const char* name) const
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{
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int col = PQfnumber(res_, name);
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if (col >= 0)
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{
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return getValue(col);
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}
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return 0;
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}
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private:
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PGresult* res_;
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int pos_;
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int numTuples_;
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};
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#endif // POSTGIS_RESULTSET_HPP
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