public Clob getClob(String colName) throws SQLException {
        return getClob(getColIdxByName(colName));
    }
Retrieves the value of the designated column in this
<code>CachedRowSetImpl</code> object as a <code>Clob</code> object
in the Java programming language.

@param colName a <code>String</code> object that must match the
       SQL name of a column in this rowset, ignoring case
@return a <code>Clob</code> object representing an SQL
        <code>CLOB</code> value
@throws SQLException if (1) the given column name is not the name of
           a column in this rowset, (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>CLOB</code> value
@see #getClob(int)
src/main/java/org/replicadb/rowset/sun/rowset/CachedRowSetImpl.java