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TypeHandler.cpp

//
// Binding.cpp
//
// $Id: //poco/1.3/Data/samples/TypeHandler/src/TypeHandler.cpp#4 $
//
// This sample demonstrates the Data library.
//
// Copyright (c) 2008, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// 
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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// DEALINGS IN THE SOFTWARE.


#include "Poco/SharedPtr.h"
#include "Poco/Data/SessionFactory.h"
#include "Poco/Data/Session.h"
#include "Poco/Data/TypeHandler.h"
#include "Poco/Data/SQLite/Connector.h"
#include <vector>
#include <iostream>


using namespace Poco::Data;


struct Person
{
      std::string name;
      std::string address;
      int         age;
};


namespace Poco {
namespace Data {


template <>
class TypeHandler<Person>
      /// Defining a specialization of TypeHandler for Person allows us
      /// to use the Person struct in use and into clauses.
{
public:
      static std::size_t size()
      {
            return 3;
      }
      
      static void bind(std::size_t pos, const Person& person, AbstractBinder* pBinder)
      {
            TypeHandler<std::string>::bind(pos++, person.name, pBinder);
            TypeHandler<std::string>::bind(pos++, person.address, pBinder);
            TypeHandler<int>::bind(pos++, person.age, pBinder);
      }
      
      static void extract(std::size_t pos, Person& person, const Person& deflt, AbstractExtractor* pExtr)
      {
            TypeHandler<std::string>::extract(pos++, person.name, deflt.name, pExtr);
            TypeHandler<std::string>::extract(pos++, person.address, deflt.address, pExtr);
            TypeHandler<int>::extract(pos++, person.age, deflt.age, pExtr);
      }
      
      static void prepare(std::size_t pos, const Person& person, AbstractPreparation* pPrep)
      {
            TypeHandler<std::string>::prepare(pos++, person.name, pPrep);
            TypeHandler<std::string>::prepare(pos++, person.address, pPrep);
            TypeHandler<int>::prepare(pos++, person.age, pPrep);
      }
};


} } // namespace Poco::Data


int main(int argc, char** argv)
{
      // register SQLite connector
      Poco::Data::SQLite::Connector::registerConnector();
      
      // create a session
      Session session("SQLite", "sample.db");

      // drop sample table, if it exists
      session << "DROP TABLE IF EXISTS Person", now;
      
      // (re)create table
      session << "CREATE TABLE Person (Name VARCHAR(30), Address VARCHAR, Age INTEGER(3))", now;
      
      // insert some rows
      Person person = 
      {
            "Bart Simpson",
            "Springfield",
            12
      };
      
      Statement insert(session);
      insert << "INSERT INTO Person VALUES(?, ?, ?)",
            use(person);
            
      insert.execute();
      
      person.name    = "Lisa Simpson";
      person.address = "Springfield";
      person.age     = 10;
      
      insert.execute();
      
      // a simple query
      Statement select(session);
      select << "SELECT Name, Address, Age FROM Person",
            into(person),
            range(0, 1); //  iterate over result set one row at a time
            
      while (!select.done())
      {
            select.execute();
            std::cout << person.name << " " << person.address << " " << person.age << std::endl;
      }
      
      // another query - store the result in a container
      std::vector<Person> persons;
      session << "SELECT Name, Address, Age FROM Person",
            into(persons),
            now;
            
      for (std::vector<Person>::const_iterator it = persons.begin(); it != persons.end(); ++it)
      {
            std::cout << it->name << " " << it->address << " " << it->age << std::endl;
      }
      
      return 0;
}

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