docs: @Override
      public void update(IEntityGroup group) throws GroupsException {
          Connection conn = null;
          boolean exists = existsInDatabase(group);
          try {
              conn = RDBMServices.getConnection();
              setAutoCommit(conn, false);
  
              try {
                  if (exists) {
                      primUpdate(group, conn);
                  } else {
                      primAdd(group, conn);
                  }
                  primUpdateMembers((EntityGroupImpl) group, conn);
                  commit(conn);
              } catch (Exception ex) {
                  rollback(conn);
                  throw new GroupsException("Problem updating " + this + ex);
              }
          } catch (SQLException sqlex) {
              throw new GroupsException(sqlex);
          } finally {
              if (conn != null) {
                  try {
                      setAutoCommit(conn, true);
                  } catch (SQLException sqle) {
                      throw new GroupsException(sqle);
                  } finally {
                      RDBMServices.releaseConnection(conn);
                  }
              }
          }
      }