The record number is an artificial number counting records in the order

as they are stored in the database. The first record has number 0.

The optional mode can be

PX_KEYTOLOWER or PX_KEYTOUPPER

in order to convert the keys into lower or upper case. If

mode is not passed or is 0, then the key will be

exactly like the field name. The element values will contain the field

values. NULL values will be retained and are different from 0.0, 0 or

the empty string. Fields of type PX_FIELD_TIME

will be returned as an integer counting the number of milliseconds

starting at midnight. A timestamp is a floating point value also

counting milliseconds starting at the beginning of julian calendar.