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Diffstat (limited to 'examples/beaker_caching/helloworld.py')
| -rw-r--r-- | examples/beaker_caching/helloworld.py | 62 |
1 files changed, 0 insertions, 62 deletions
diff --git a/examples/beaker_caching/helloworld.py b/examples/beaker_caching/helloworld.py deleted file mode 100644 index 6f696c502..000000000 --- a/examples/beaker_caching/helloworld.py +++ /dev/null @@ -1,62 +0,0 @@ -"""helloworld.py - -Illustrate how to load some data, and cache the results. - -""" - -from environment import Session -from model import Person -from caching_query import FromCache - -# load Person objects. cache the result under the namespace "all_people". -print "loading people...." -people = Session.query(Person).options(FromCache("default", "all_people")).all() - -# remove the Session. next query starts from scratch. -Session.remove() - -# load again, using the same FromCache option. now they're cached -# under "all_people", no SQL is emitted. -print "loading people....again!" -people = Session.query(Person).options(FromCache("default", "all_people")).all() - -# want to load on some different kind of query ? change the namespace -# you send to FromCache -print "loading people two through twelve" -people_two_through_twelve = Session.query(Person).\ - options(FromCache("default", "people_on_range")).\ - filter(Person.name.between("person 02", "person 12")).\ - all() - -# the data is cached under the "namespace" you send to FromCache, *plus* -# the bind parameters of the query. So this query, having -# different literal parameters under "Person.name.between()" than the -# previous one, issues new SQL... -print "loading people five through fifteen" -people_five_through_fifteen = Session.query(Person).\ - options(FromCache("default", "people_on_range")).\ - filter(Person.name.between("person 05", "person 15")).\ - all() - - -# ... but using the same params as are already cached, no SQL -print "loading people two through twelve...again!" -people_two_through_twelve = Session.query(Person).\ - options(FromCache("default", "people_on_range")).\ - filter(Person.name.between("person 02", "person 12")).\ - all() - - -# invalidate the cache for the three queries we've done. Recreate -# each Query, which includes at the very least the same FromCache, -# same list of objects to be loaded, and the same parameters in the -# same order, then call invalidate(). -print "invalidating everything" -Session.query(Person).options(FromCache("default", "all_people")).invalidate() -Session.query(Person).\ - options(FromCache("default", "people_on_range")).\ - filter(Person.name.between("person 02", "person 12")).invalidate() -Session.query(Person).\ - options(FromCache("default", "people_on_range")).\ - filter(Person.name.between("person 05", "person 15")).invalidate() - |