code: protected void configureDatabaseIdent (String dbident)
      {
          _dbident = dbident;
  
          // give the repository a chance to do any schema migration before things get further
          // underway
          try {
              executeUpdate(new Operation<Object>() {
                  public Object invoke (Connection conn, DatabaseLiaison liaison)
                      throws SQLException, PersistenceException
                  {
                      migrateSchema(conn, liaison);
                      return null;
                  }
              });
          } catch (PersistenceException pe) {
              log.warning("Failure migrating schema", "dbident", _dbident, pe);
          }
      }
docs: This is called automatically if a dbident is provided at construct time, but a derived class
  can pass null to its constructor and then call this method itself later if it wishes to
  obtain its database identifier from an overridable method which could not otherwise be
  called at construct time.