code: public synchronized long length() throws SQLException {
  
          try {
              return clob.length(session);
          } catch (HsqlException e) {
              throw Util.sqlException(e);
          }
      }
docs: Retrieves the number of characters in the <code>CLOB</code> value
  designated by this <code>Clob</code> object.
  
  @return length of the <code>CLOB</code> in characters
  @throws SQLException if there is an error accessing the length of the
  <code>CLOB</code> value