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/*
* Copyright (C) 2015 Tommi Maekitalo
*
* 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.
*
* As a special exception, you may use this file as part of a free
* software library without restriction. Specifically, if other files
* instantiate templates or use macros or inline functions from this
* file, or you compile this file and link it with other files to
* produce an executable, this file does not by itself cause the
* resulting executable to be covered by the GNU General Public
* License. This exception does not however invalidate any other
* reasons why the executable file might be covered by the GNU Library
* General Public License.
*
* This library 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
* 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 Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <tntdb/connect.h>
#include <tntdb/statement.h>
#include <tntdb/serialization.h>
#include <cxxtools/serializationinfo.h>
#include <cxxtools/log.h>
#include <iostream>
struct MyObject
{
unsigned id;
int a;
std::string b;
};
void operator>>= (const cxxtools::SerializationInfo& si, MyObject& obj)
{
si.getMember("id") >>= obj.id;
si.getMember("a") >>= obj.a;
si.getMember("b") >>= obj.b;
}
int main(int argc, char* argv[])
{
try
{
log_init(); // Logging should be initialized always; reads log.xml or log.properties to configure logging
if (argc <= 1)
{
std::cerr << "Usage: " << argv[0] << " dburl\n";
return -1;
}
// connect to database
std::string database = argv[1];
tntdb::Connection db = tntdb::connect(database);
tntdb::Statement sel = db.prepare(
"select id, a, b"
" from myobjects");
for (tntdb::Statement::const_iterator it = sel.begin(); it != sel.end(); ++it)
{
// create empty object
MyObject obj;
// *it returns a tntdb::Row with the result
// The operator >>= uses the deserialization operator of MyObject to extract
// the data. The names of the columns must match the members defined in the
// deserialization operator.
*it >>= obj;
// output the data
std::cout << "id=" << obj.id << " a=" << obj.a << " b=\"" << obj.b << "\"\n";
}
}
catch (const std::exception& e)
{
std::cerr << e.what() << std::endl;
}
}
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