code: protected void readFromDB()
          throws EFapsException
      {
          readFromDBAttributes();
          this.roles.clear();
          for (final Role role : getRolesFromDB()) {
              add(role);
          }
          this.groups.clear();
          for (final Group group : getGroupsFromDB(null)) {
              add(group);
          }
          this.companies.clear();
          for (final Company company : getCompaniesFromDB(null)) {
              add(company);
          }
          this.associations.clear();
          for (final Association association : getAssociationsFromDB(null)) {
              add(association);
          }
      }
docs: The instance method reads all information from the database.
  
  @throws EFapsException on error
  @see #readFromDBAttributes()