dbioservice.hpp.svn-base

自己写的

/*  Copy Left/Right : OTHER ,Amfproject                                     *
 *                                                                          *
 *     This program 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; version 2 of the License.                 *
 *                                                                          *
 *  This program 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 this program; if not, write to the Free Software             *
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA*
 ****************************************************************************
 * Project:    LibKDD0
 * Programmer: lucy
 * Created On: Jan 16, 2009
 ****************************************************************************/

#ifndef DBIOSERVICE_HPP_
#define DBIOSERVICE_HPP_
/*-- Compiler Controls -----------------------------------------------------*/

/*-- Includes --------------------------------------------------------------*/
#define MYSQLPP_MYSQL_HEADERS_BURIED
#include <mysql++/mysql++.h>
#include <string>
#include <vector>
#include <boost/noncopyable.hpp>
#include <boost/thread/mutex.hpp>
#include <boost/thread/condition.hpp>
#include <stdexcept>
/*-- Namespace Controller --------------------------------------------------*/
namespace kdd
{

/*-- Extern Types ----------------------------------------------------------*/

/*--------------------------------------------------------------------------*/

class dbioservice : private boost::noncopyable
{
public:

	class no_free_connection : public std::runtime_error
	{
	public:
		no_free_connection() :
			std::runtime_error("no free connection")
		{
		}

		~no_free_connection() throw()
		{
		}
	};

	dbioservice(std::string const &server, std::string const& db, std::string const& user, std::string const& pass) :
		_server(server), _db(db), _user(user), _pass(pass), next_free_connection(0)
	{
	}
	void run();

	~dbioservice();
private:

	friend class db_queryer;

	class dbConnection
	{
	public:
		dbConnection(std::string const& db,std::string const &server, std::string const& user, std::string const& pass)
		:conn(db.c_str(),server.c_str(),user.c_str(),pass.c_str()),Sfree(true)
		{  }
		mysqlpp::Connection& getConnection()
		{
			return conn;
		}
		bool isFree() const
		{
			return Sfree;
		}
		void free()
		{
			 Sfree=true;
		}
		void occupy()
		{
			 Sfree=false;
		}
	protected:
		mysqlpp::Connection conn;
		bool Sfree;
	};


	std::string _server;
	std::string _db;
	std::string _user;
	std::string _pass;

	size_t next_free_connection;

	std::vector< boost::shared_ptr<dbConnection> > connStack;

	dbConnection& freeConnection() throw (dbioservice::no_free_connection);

};

/*-- Namespace Ender -------------------------------------------------------*/
}
/*--------------------------------------------------------------------------*/
#endif /* DBIOSERVICE_HPP_ */