code: public java.io.InputStream getAsciiStream() throws SQLException {
  
          checkValid(data);
  
          try {
              return new ByteArrayInputStream(data.getBytes("US-ASCII"));
          } catch (IOException e) {
              return null;
          }
      }
docs: Retrieves the <code>CLOB</code> value designated by this <code>Clob</code>
  object as an ascii stream.
  
  @return a <code>java.io.InputStream</code> object containing the
  <code>CLOB</code> data
  @exception SQLException if there is an error accessing the
  <code>CLOB</code> value
  @exception SQLFeatureNotSupportedException if the JDBC driver does not support
  this method
  @see #setAsciiStream
  @since JDK 1.2, HSQLDB 1.7.2