SQLite3Backend(Config *config);

		/// Destructor.

		~SQLite3Backend();

		/// Connects to the database and creates it if it's needed. This method call createDatabase() function

		/// automatically.

		/// \return true if database is opened successfully.

		bool connect();

		/// Creates database structure.

		/// \see connect()

		/// \return true if database structure has been created successfully. Note that it returns True also if database structure

		/// already exists.

		bool createDatabase();

		/// Stores user into database.

		/// \param user user struct containing all information about user which have to be stored

		void setUser(const UserInfo &user);

		/// Gets user data from database and stores them into user reference.

		/// \param barejid barejid of user

		/// \param user UserInfo object where user data will be stored

		/// \return true if user has been found in database

		bool getUser(const std::string &barejid, UserInfo &user);

		/// Changes users online state variable in database.

		/// \param id id of user - UserInfo.id

		/// \param online online state

		void setUserOnline(long id, bool online);

		/// Removes user and all connected data from database.

		/// \param id id of user - UserInfo.id

		/// \return true if user has been found in database and removed

		bool removeUser(long id);

		/// Returns JIDs of all buddies in user's roster.

		/// \param id id of user - UserInfo.id

		/// \param roster string list used to store user's roster

		/// \return true if user has been found in database and roster has been fetched

		bool getBuddies(long id, std::list<BuddyInfo> &roster);

		long addBuddy(long userId, const BuddyInfo &buddyInfo);

		void updateBuddy(long userId, const BuddyInfo &buddyInfo);

		void removeBuddy(long id) {}

		void getUserSetting(long userId, const std::string &variable, int &type, std::string &value);

		void beginTransaction();

		void commitTransaction();

	private:

		bool exec(const std::string &query);

		sqlite3 *m_db;

		Config *m_config;

		std::string m_prefix;

		// statements

		sqlite3_stmt *m_setUser;

		sqlite3_stmt *m_getUser;

		sqlite3_stmt *m_getUserSetting;

		sqlite3_stmt *m_setUserSetting;

		sqlite3_stmt *m_removeUser;

		sqlite3_stmt *m_removeUserBuddies;

		sqlite3_stmt *m_removeUserSettings;

		sqlite3_stmt *m_removeUserBuddiesSettings;

		sqlite3_stmt *m_addBuddy;

		sqlite3_stmt *m_updateBuddy;

		sqlite3_stmt *m_getBuddies;

		sqlite3_stmt *m_getBuddiesSettings;

};

}

	}

#define BEGIN(STATEMENT) 	sqlite3_reset(m_addBuddy);\

							int STATEMENT##_id = 1;\

							int STATEMENT##_id_get = -1;\

							(void)STATEMENT##_id_get;

#define BIND_INT(STATEMENT, VARIABLE) sqlite3_bind_int(STATEMENT, STATEMENT##_id++, VARIABLE)

#define BIND_STR(STATEMENT, VARIABLE) sqlite3_bind_text(STATEMENT, STATEMENT##_id++, VARIABLE.c_str(), -1, SQLITE_STATIC)

#define GET_INT(STATEMENT)	sqlite3_column_int(STATEMENT, STATEMENT##_id_get++)

#define GET_STR(STATEMENT)	(const char *) sqlite3_column_text(STATEMENT, STATEMENT##_id_get++)

#define EXECUTE_STATEMENT(STATEMENT, NAME) 	if(sqlite3_step(STATEMENT) != SQLITE_DONE) {\

		onStorageError(NAME, (sqlite3_errmsg(m_db) == NULL ? "" : sqlite3_errmsg(m_db)));\

			}

using namespace boost;

namespace Transport {

SQLite3Backend::SQLite3Backend(Config *config) {

	m_config = config;

	m_db = NULL;

	m_prefix = CONFIG_STRING(m_config, "database.prefix");

}

SQLite3Backend::~SQLite3Backend(){

	if (m_db) {

		// Would be nice to use this:

		//

		//   sqlite3_stmt *pStmt;

		//   while((pStmt = sqlite3_next_stmt(db, 0)) != 0 ) {

		//    sqlite3_finalize(pStmt);

		//   }

		//

		// But requires SQLite3 >= 3.6.0 beta

		FINALIZE_STMT(m_setUser);

		FINALIZE_STMT(m_getUser);

		FINALIZE_STMT(m_removeUser);

		FINALIZE_STMT(m_removeUserBuddies);

		FINALIZE_STMT(m_removeUserSettings);

		FINALIZE_STMT(m_removeUserBuddiesSettings);

		FINALIZE_STMT(m_addBuddy);

		FINALIZE_STMT(m_updateBuddy);

		FINALIZE_STMT(m_getBuddies);

		FINALIZE_STMT(m_getBuddiesSettings);

		FINALIZE_STMT(m_getUserSetting);

		FINALIZE_STMT(m_setUserSetting);

		sqlite3_close(m_db);

	}

}

bool SQLite3Backend::connect() {

	if (sqlite3_open(CONFIG_STRING(m_config, "database.database").c_str(), &m_db)) {

		sqlite3_close(m_db);

		return false;

	}

	if (createDatabase() == false)

		return false;

	PREP_STMT(m_setUser, "INSERT INTO " + m_prefix + "users (jid, uin, password, language, encoding, last_login, vip) VALUES (?, ?, ?, ?, ?, DATETIME('NOW'), ?)");

	PREP_STMT(m_getUser, "SELECT id, jid, uin, password, encoding, language, vip FROM " + m_prefix + "users WHERE jid=?");

	PREP_STMT(m_removeUser, "DELETE FROM " + m_prefix + "users WHERE id=?");

	PREP_STMT(m_removeUserBuddies, "DELETE FROM " + m_prefix + "buddies WHERE user_id=?");

	PREP_STMT(m_removeUserSettings, "DELETE FROM " + m_prefix + "users_settings WHERE user_id=?");

	PREP_STMT(m_removeUserBuddiesSettings, "DELETE FROM " + m_prefix + "buddies_settings WHERE user_id=?");

	PREP_STMT(m_addBuddy, "INSERT INTO " + m_prefix + "buddies (user_id, uin, subscription, groups, nickname, flags) VALUES (?, ?, ?, ?, ?, ?)");

	PREP_STMT(m_updateBuddy, "UPDATE " + m_prefix + "buddies SET groups=?, nickname=?, flags=?, subscription=? WHERE user_id=? AND uin=?");

	PREP_STMT(m_getBuddies, "SELECT id uin, subscription, nickname, groups, flags FROM " + m_prefix + "buddies WHERE user_id=? ORDER BY id ASC");

	PREP_STMT(m_getBuddiesSettings, "SELECT buddy_id, type, var, value FROM " + m_prefix + "buddies_settings WHERE user_id=? ORDER BY buddy_id ASC");

	PREP_STMT(m_getUserSetting, "SELECT type, value FROM " + m_prefix + "users_settings WHERE user_id=? AND var=?");

	PREP_STMT(m_setUserSetting, "INSERT INTO " + m_prefix + "users_settings (user_id, var, type, value) VALUES (?,?,?,?)");

	return true;

}

bool SQLite3Backend::createDatabase() {

	int not_exist = exec("CREATE TABLE " + m_prefix + "buddies ("

				"  id INTEGER PRIMARY KEY NOT NULL,"

				"  user_id int(10) NOT NULL,"

				"  uin varchar(255) NOT NULL,"

				"  subscription varchar(20) NOT NULL,"

				"  nickname varchar(255) NOT NULL,"

				"  groups varchar(255) NOT NULL,"

				"  flags int(4) NOT NULL DEFAULT '0'"

				");");

	if (not_exist) {

		exec("CREATE UNIQUE INDEX IF NOT EXISTS user_id ON " + m_prefix + "buddies (user_id, uin);");

		exec("CREATE TABLE IF NOT EXISTS " + m_prefix + "buddies_settings ("

					"  user_id int(10) NOT NULL,"

					"  buddy_id int(10) NOT NULL,"

					"  var varchar(50) NOT NULL,"

					"  type int(4) NOT NULL,"

					"  value varchar(255) NOT NULL,"

					"  PRIMARY KEY (buddy_id, var)"

					");");

		exec("CREATE INDEX IF NOT EXISTS user_id02 ON " + m_prefix + "buddies_settings (user_id);");

		exec("CREATE TABLE IF NOT EXISTS " + m_prefix + "users ("

					"  id INTEGER PRIMARY KEY NOT NULL,"

					"  jid varchar(255) NOT NULL,"

					"  uin varchar(4095) NOT NULL,"

					"  password varchar(255) NOT NULL,"

					"  language varchar(25) NOT NULL,"

					"  encoding varchar(50) NOT NULL DEFAULT 'utf8',"

					"  last_login datetime,"

					"  vip int(1) NOT NULL DEFAULT '0',"

					"  online int(1) NOT NULL DEFAULT '0'"

					");");

		exec("CREATE UNIQUE INDEX IF NOT EXISTS jid ON " + m_prefix + "users (jid);");

		exec("CREATE TABLE " + m_prefix + "users_settings ("

					"  user_id int(10) NOT NULL,"

					"  var varchar(50) NOT NULL,"

					"  type int(4) NOT NULL,"

					"  value varchar(4095) NOT NULL,"

	sqlite3_bind_int(m_removeUser, 1, id);

	if(sqlite3_step(m_removeUser) != SQLITE_DONE) {

		onStorageError("removeUser query", (sqlite3_errmsg(m_db) == NULL ? "" : sqlite3_errmsg(m_db)));

		return false;

	}

	sqlite3_reset(m_removeUserSettings);

	sqlite3_bind_int(m_removeUserSettings, 1, id);

	if(sqlite3_step(m_removeUserSettings) != SQLITE_DONE) {

		onStorageError("removeUserSettings query", (sqlite3_errmsg(m_db) == NULL ? "" : sqlite3_errmsg(m_db)));

		return false;

	}

	sqlite3_reset(m_removeUserBuddies);

	sqlite3_bind_int(m_removeUserBuddies, 1, id);

	if(sqlite3_step(m_removeUserBuddies) != SQLITE_DONE) {

		onStorageError("removeUserBuddies query", (sqlite3_errmsg(m_db) == NULL ? "" : sqlite3_errmsg(m_db)));

		return false;

	}

	sqlite3_reset(m_removeUserBuddiesSettings);

	sqlite3_bind_int(m_removeUserBuddiesSettings, 1, id);

	if(sqlite3_step(m_removeUserBuddiesSettings) != SQLITE_DONE) {

		onStorageError("removeUserBuddiesSettings query", (sqlite3_errmsg(m_db) == NULL ? "" : sqlite3_errmsg(m_db)));

		return false;

	}

	return true;

}

void SQLite3Backend::getUserSetting(long id, const std::string &variable, int &type, std::string &value) {

	BEGIN(m_getUserSetting);

	BIND_INT(m_getUserSetting, id);

	BIND_STR(m_getUserSetting, variable);

	if(sqlite3_step(m_setUser) != SQLITE_ROW) {

		BEGIN(m_setUserSetting);

		BIND_INT(m_setUserSetting, id);

		BIND_STR(m_setUserSetting, variable);

		BIND_INT(m_setUserSetting, type);

		BIND_STR(m_setUserSetting, value);

		EXECUTE_STATEMENT(m_setUserSetting, "m_setUserSetting");

	}

	else {

		type = GET_INT(m_getUserSetting);

		value = GET_STR(m_getUserSetting);

	}

}

void SQLite3Backend::beginTransaction() {

	exec("BEGIN TRANSACTION;");

}

void SQLite3Backend::commitTransaction() {

	exec("COMMIT TRANSACTION;");

}

}