public java.net.URL getURL(String columnName) throws SQLException {
        throw new UnsupportedOperationException();

    }
Retrieves the value of the designated column in this
<code>CachedRowSetImpl</code> object as a <code>java.net.URL</code> object
in the Java programming language.

@return a java.net.URL object containing the resource reference described by
the URL
@throws SQLException if (1) the given column name not the name of a column
in this rowset, or
(2) the cursor is not on one of this rowset's rows or its
insert row, or (3) the designated column does not store an
SQL <code>DATALINK</code> value.
@see #getURL(int)
src/main/java/org/replicadb/rowset/sun/rowset/internal/SyncResolverImpl.java