code: @Override
      @SuppressFBWarnings("SQL_NONCONSTANT_STRING_PASSED_TO_EXECUTE")
      public boolean existsSequence(final Connection _con,
                                    final String _name)
          throws SQLException
      {
          final boolean ret;
          final String cmd = new StringBuilder()
                          .append("SELECT sequence_name FROM user_sequences WHERE sequence_name='")
                          .append(_name.toLowerCase()).append("'")
                          .toString();
          final Statement stmt = _con.createStatement();
          try {
              final ResultSet resultset = stmt.executeQuery(cmd);
              ret = resultset.next();
              resultset.close();
          } finally {
              stmt.close();
          }
          return ret;
      }
docs: {@inheritDoc}