public static Account getAccounts(string usernames)
            {
                if (accounts.Any(x => x.username == usernames))
                  {
                      return accounts.Where(x => x.username == usernames).First();
                  }
                  using (IDbConnection connection = Databases.GetConnection())
                  {
                      var results = connection.Query<Account>(
                        "SELECT * FROM accounts WHERE username = @username",
                        new { username = usernames });
                      if (results.Count() > 0)
                      {
                          foreach (var data in results)
                          {
                              accounts.Add(data);
                          }
                         var resultats =  results.First();
                         return resultats;
                      }
                      else
                      {
                          return null;
                      }
                   }
             }