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from peewee import *
db = SqliteDatabase(':memory:')
#db = PostgresqlDatabase('peewee_test', host='127.0.0.1', port=26257, user='root')
#db = PostgresqlDatabase('peewee_test', host='127.0.0.1', user='postgres')
class Base(Model):
class Meta:
database = db
class Register(Base):
value = IntegerField()
class Collection(Base):
name = TextField()
class Item(Base):
collection = ForeignKeyField(Collection, backref='items')
name = TextField()
import functools
import time
def timed(fn):
@functools.wraps(fn)
def inner(*args, **kwargs):
times = []
N = 10
for i in range(N):
start = time.perf_counter()
fn(i, *args, **kwargs)
times.append(time.perf_counter() - start)
print('%0.3f ... %s' % (round(sum(times) / N, 3), fn.__name__))
return inner
def populate_register(s, n):
for i in range(s, n):
Register.create(value=i)
def populate_collections(n, n_i):
for i in range(n):
c = Collection.create(name=str(i))
for j in range(n_i):
Item.create(collection=c, name=str(j))
@timed
def insert(i):
with db.atomic():
populate_register((i * 1000), (i + 1) * 1000)
@timed
def batch_insert(i):
it = range(i * 1000, (i + 1) * 1000)
for i in db.batch_commit(it, 100):
Register.insert(value=i).execute()
@timed
def bulk_insert(i):
with db.atomic():
for i in range(i * 1000, (i + 1) * 1000, 100):
data = [(j,) for j in range(i, i + 100)]
Register.insert_many(data, fields=[Register.value]).execute()
@timed
def bulk_create(i):
with db.atomic():
data = [Register(value=i) for i in range(i * 1000, (i + 1) * 1000)]
Register.bulk_create(data, batch_size=100)
@timed
def select(i):
query = Register.select()
for row in query:
pass
@timed
def select_related_dbapi_raw(i):
query = Item.select(Item, Collection).join(Collection)
cursor = db.execute(query)
for row in cursor:
pass
@timed
def insert_related(i):
with db.atomic():
populate_collections(30, 60)
@timed
def select_related(i):
query = Item.select(Item, Collection).join(Collection)
for item in query:
pass
@timed
def select_related_left(i):
query = Collection.select(Collection, Item).join(Item, JOIN.LEFT_OUTER)
for collection in query:
pass
@timed
def select_related_dicts(i):
query = Item.select(Item, Collection).join(Collection).dicts()
for row in query:
pass
@timed
def select_related_objects(i):
query = Item.select(Item, Collection).join(Collection).objects()
for item in query:
pass
@timed
def select_prefetch(i):
query = prefetch(Collection.select(), Item)
for c in query:
for i in c.items:
pass
@timed
def select_prefetch_join(i):
query = prefetch(Collection.select(), Item,
prefetch_type=PREFETCH_TYPE.JOIN)
for c in query:
for i in c.items:
pass
if __name__ == '__main__':
db.create_tables([Register, Collection, Item])
insert()
insert_related()
Register.delete().execute()
batch_insert()
assert Register.select().count() == 10000
Register.delete().execute()
bulk_insert()
assert Register.select().count() == 10000
Register.delete().execute()
bulk_create()
assert Register.select().count() == 10000
select()
select_related()
select_related_left()
select_related_objects()
select_related_dicts()
select_related_dbapi_raw()
select_prefetch()
select_prefetch_join()
db.drop_tables([Register, Collection, Item])
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