code: public Object getProperty(String columnName) {
          try {
              return getResultSet().getObject(columnName);
          }
          catch (SQLException e) {
              throw new MissingPropertyException(columnName, GroovyResultSetProxy.class, e);
          }
      }
docs: Gets the value of the designated column in the current row
  of as an <code>Object</code>.
  
  @param columnName the SQL name of the column
  @return the returned column value
  @throws MissingPropertyException if an SQLException happens while getting the object
  @see groovy.lang.GroovyObject#getProperty(java.lang.String)
  @see ResultSet#getObject(java.lang.String)