mapnik/plugins/input/postgis/resultset.hpp

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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) 2014 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* 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
#define POSTGIS_RESULTSET_HPP
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extern "C" {
#include "libpq-fe.h"
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}
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class IResultSet
{
public:
//virtual IResultSet& operator=(const IResultSet& rhs) = 0;
virtual ~IResultSet() {}
virtual void close() = 0;
virtual int getNumFields() const = 0;
virtual bool next() = 0;
virtual const char* getFieldName(int index) const = 0;
virtual int getFieldLength(int index) const = 0;
virtual int getFieldLength(const char* name) const = 0;
virtual int getTypeOID(int index) const = 0;
virtual int getTypeOID(const char* name) const = 0;
virtual bool isNull(int index) const = 0;
virtual const char* getValue(int index) const = 0;
virtual const char* getValue(const char* name) const = 0;
};
class ResultSet : public IResultSet, private mapnik::util::noncopyable
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{
public:
ResultSet(PGresult *res)
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: res_(res),
pos_(-1)
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{
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numTuples_ = PQntuples(res_);
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}
virtual void close()
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{
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PQclear(res_);
res_ = 0;
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}
virtual ~ResultSet()
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{
PQclear(res_);
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}
virtual int getNumFields() const
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{
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return PQnfields(res_);
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}
int pos() const
{
return pos_;
}
int size() const
{
return numTuples_;
}
virtual bool next()
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{
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return (++pos_ < numTuples_);
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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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}
virtual int getFieldLength(int index) const
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{
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return PQgetlength(res_, pos_, index);
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}
virtual int getFieldLength(const char* name) const
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{
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int col = PQfnumber(res_, name);
if (col >= 0)
{
return PQgetlength(res_, pos_, col);
}
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return 0;
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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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}
virtual int getTypeOID(const char* name) const
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{
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int col = PQfnumber(res_, name);
if (col >= 0)
{
return PQftype(res_, col);
}
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return 0;
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}
virtual bool isNull(int index) const
{
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return static_cast<bool>(PQgetisnull(res_, pos_, index));
}
virtual const char* getValue(int index) const
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{
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return PQgetvalue(res_, pos_, index);
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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);
if (col >= 0)
{
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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:
PGresult* res_;
int pos_;
int numTuples_;
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};
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#endif // POSTGIS_RESULTSET_HPP