public BigDecimal getBigDecimal(String columnName) throws SQLException {
        return getBigDecimal(getColIdxByName(columnName));
    }
Retrieves the value of the designated column in the current row
of this <code>CachedRowSetImpl</code> object as a
<code>java.math.BigDecimal</code> object.

@param columnName a <code>String</code> object that must match the
       SQL name of a column in this rowset, ignoring case
@return a <code>java.math.BigDecimal</code> value with full precision;
        if the value is SQL <code>NULL</code>, the result is <code>null</code>
@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>TINYINT, SMALLINT, INTEGER
BIGINT, REAL, FLOAT, DOUBLE, <b>DECIMAL</b>, <b>NUMERIC</b>, BIT CHAR,
VARCHAR</code> or <code>LONGVARCHAR</code> value. The bold SQL type
designates the recommended return type that this method is used to
retrieve
@see #getBigDecimal(int)
src/main/java/org/replicadb/rowset/sun/rowset/CachedRowSetImpl.java