code: @Override
  	public SqlContext clobParamIfAbsent(final String paramName, final Reader value, final int len) {
  		if (!hasParam(paramName)) {
  			clobParam(paramName, value, len);
  		}
  		return this;
  	}
docs: {@inheritDoc}
  
  @see jp.co.future.uroborosql.fluent.SqlFluent#clobParamIfAbsent(java.lang.String, java.io.Reader, int)