static function GetDatabase()
 {
     if (self::$database == NULL) {
         self::$database = new medoo(array('database_type' => 'mysql', 'database_name' => 'CompanyCalendar', 'server' => 'localhost', 'username' => 'root', 'password' => 'swe6623', 'charset' => 'utf8'));
     }
     return self::$database;
 }