code: public void updateNClob(final String columnLabel, final java.sql.NClob nClob) throws SQLException {
          throw SQLExceptionMapper.getFeatureNotSupportedException("Updates are not supported");
      }
docs: Updates the designated column with a <code>java.sql.NClob</code> value. The updater methods are used to update
  column values in the current row or the insert row.  The updater methods do not update the underlying database;
  instead the <code>updateRow</code> or <code>insertRow</code> methods are called to update the database.
  
  @param columnLabel the label for the column specified with the SQL AS clause.  If the SQL AS clause was not
  specified, then the label is the name of the column
  @param nClob       the value for the column to be updated
  @throws java.sql.SQLException if the columnLabel is not valid; if the driver does not support national character
  sets;  if the driver can detect that a data conversion error could occur; this
  method is called on a closed result set; if a database access error occurs or the
  result set concurrency is <code>CONCUR_READ_ONLY</code>
  @throws java.sql.SQLFeatureNotSupportedException
  if the JDBC driver does not support this method
  @since 1.6