mirror of
https://github.com/sqlalchemy/sqlalchemy.git
synced 2026-05-15 05:07:16 -04:00
Mike Bayer
40f8aadd58
- added READMEs to all examples in each __init__.py and added to sphinx documentation - added versioning example - removed vertical/vertical.py, the dictlikes are more straightforward
26 lines
924 B
Python
26 lines
924 B
Python
"""relation_caching.py
|
|
|
|
Load a set of Person and Address objects, specifying that
|
|
related PostalCode, City, Country objects should be pulled from long
|
|
term cache.
|
|
|
|
"""
|
|
import environment
|
|
from model import Person, Address, cache_address_bits
|
|
from meta import Session
|
|
from sqlalchemy.orm import eagerload
|
|
import os
|
|
|
|
for p in Session.query(Person).options(eagerload(Person.addresses), cache_address_bits):
|
|
print p.format_full()
|
|
|
|
|
|
print "\n\nIf this was the first run of relation_caching.py, SQL was likely emitted to "\
|
|
"load postal codes, cities, countries.\n"\
|
|
"If run a second time, only a single SQL statement will run - all "\
|
|
"related data is pulled from cache.\n"\
|
|
"To clear the cache, delete the directory %r. \n"\
|
|
"This will cause a re-load of cities, postal codes and countries on "\
|
|
"the next run.\n"\
|
|
% os.path.join(environment.root, 'container_file')
|