bool Sqlite3Session::Open(const char* filename) {
	// Only open db once.
	ASSERT(NULL == db);
	current_filename = filename;
	// By default, sqlite3 associates the opened db with "main.*"
	// However, using the ATTACH sql command, it can connect to more databases.
	// I don't know how to get the list of attached databases from the API
	current_dbname = "main";
	if(SQLITE_OK == sqlite3_open(filename, &db))
		return true;
	if(db) {
		sqlite3_close(db);
		db = NULL;
	}
	return false;
}