[SQLObject] Unique ID Number question

[Scott C. <sco...@mi...>]

In SQLObject.html, it shows the following:

p = Person.new(firstName="John", lastName="Doe")
#>> QueryIns:
#   INSERT INTO person (last_name, middle_initial, first_name)
#   VALUES ('Doe', NULL, 'John')
#
#-- Not quite optimized, we don't remember the values we used to
#-- create the object, so they get re-fetched from the database:
#>> QueryOne:
#   SELECT last_name, middle_initial, first_name
#   FROM person
#   WHERE id = 1

Where does it learn that the new Person has an ID of 1?

I tried the same commands manually and the insert doesn't return the ID.  How 
does SQLObject know what the ID is?

Confsued,
Scott