public int findColumn(String columnName) throws SQLException {
        return getColIdxByName(columnName);
    }
Maps the given column name for one of this <code>CachedRowSetImpl</code>
object's columns to its column number.

@param columnName a <code>String</code> object that must match the
       SQL name of a column in this rowset, ignoring case
@return the column index of the given column name
@throws SQLException if the given column name does not match one
           of this rowset's column names
src/main/java/org/replicadb/rowset/sun/rowset/CachedRowSetImpl.java