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dindexer/include/pq/connection.hpp

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/* Copyright 2015, 2016, Michele Santullo
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* This file is part of "dindexer".
*
* "dindexer" is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* "dindexer" is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with "dindexer". If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef id68BF7AAC5BD54AF2BBD6EC1318B6687E
#define id68BF7AAC5BD54AF2BBD6EC1318B6687E
#include "pq/resultset.hpp"
#include "pq/implem/pq_type_helpers.hpp"
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#include <string>
#include <cstdint>
#include <memory>
#include <boost/utility/string_ref.hpp>
struct pg_param;
typedef pg_param PGparam;
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namespace pq {
class Connection {
friend struct implem::get_pqlib_c_type_struct_arr;
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public:
Connection ( std::string&& parUsername, std::string&& parPasswd, std::string&& parDatabase, std::string&& parAddress, uint16_t parPort );
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Connection ( Connection&& );
Connection ( const Connection& ) = delete;
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~Connection ( void ) noexcept;
std::string error_message ( void ) const;
bool is_connected ( void ) const noexcept;
void connect ( void );
void disconnect ( void );
ResultSet query ( const std::string& parQuery );
std::string escaped_literal ( const std::string& parString );
std::string escaped_literal ( boost::string_ref parString );
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template <typename... Args>
ResultSet query ( const std::string& parQuery, Args&&... parArgs );
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Connection& operator= ( Connection&& );
Connection& operator= ( const Connection& ) = delete;
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private:
struct LocalData;
using PGParams = std::unique_ptr<::PGparam, void(*)(::PGparam*)>;
ResultSet query_params ( const std::string& parQuery, PGParams& parParams );
PGParams make_params ( const std::string* parTypes, ... );
PGParams make_empty_params ( void ) const;
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std::unique_ptr<LocalData> m_localData;
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std::string m_username;
std::string m_passwd;
std::string m_database;
std::string m_address;
uint16_t m_port;
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};
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template <typename... Args>
ResultSet Connection::query (const std::string& parQuery, Args&&... parArgs) {
using std::remove_cv;
using std::remove_reference;
auto make_pgparams = [&parArgs..., this](){
using implem::make_pqtypes_name;
using implem::concat_strings;
auto types_bt = concat_strings(make_pqtypes_name<typename remove_cv<typename remove_reference<Args>::type>::type>()...);
static_assert(types_bt.size() > 0, "Invalid empty types string (function called with no arguments?)");
const std::string types(types_bt.data(), types_bt.size());
return this->make_params(&types, implem::get_pqlib_c_type_struct<typename remove_cv<typename remove_reference<Args>::type>::type>(this).conv(parArgs)...);
};
PGParams pgparams = make_pgparams();
return this->query_params(parQuery, pgparams);
}
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} //namespace pq
#endif