6.4. class CBCData: The database
interface
The actual class declaration begins here.
All the metadata—schema, tables, and
object-relational mappings—are declared inside
this class. The mapped classes are also
inside this class; the author found this
somewhat disturbing at first, but it makes perfect sense.
For example, if a user has an instance db
of class CBCData, they can refer to the
circles table as db.circles_table or as
CBCData.circles_table. Similarly, they
can refer to the constructor the class mapped to that
table either as db.Circle or CBCData.circle.
pycbc.py
# - - - - - c l a s s C B C D a t a
class CBCData(object):
'''Represents the entire Christmas Bird Count database.
'''
