Object getCachedObject() throws SQLException { if (rs.row[numCol]==null) return BLOB_NULL_VALUE;
byte[] getCachedObject() throws SQLException { if (rs.row[numCol]==null) return null;
    Object getCachedObject() throws SQLException {        if (rs.row[numCol]==null)            return BLOB_NULL_VALUE;        return new FBCachedBlob(getBytesInternal());    }