mirror of
https://github.com/sqlalchemy/sqlalchemy.git
synced 2026-05-14 12:47:22 -04:00
Mike Bayer
b9043754f0
this was pretty misleading as it shows up first in the file listing Change-Id: I6a92820e487a04632b651f9f6c631b32e338c043
65 lines
1.6 KiB
Python
65 lines
1.6 KiB
Python
"""This series of tests will illustrate different ways to UPDATE a large number
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of rows in bulk (under construction! there's just one test at the moment)
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"""
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from sqlalchemy import Column
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from sqlalchemy import create_engine
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from sqlalchemy import Integer
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from sqlalchemy import String
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from sqlalchemy.ext.declarative import declarative_base
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from sqlalchemy.orm import Session
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from . import Profiler
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Base = declarative_base()
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engine = None
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class Customer(Base):
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__tablename__ = "customer"
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id = Column(Integer, primary_key=True)
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name = Column(String(255))
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description = Column(String(255))
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Profiler.init("bulk_updates", num=100000)
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@Profiler.setup
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def setup_database(dburl, echo, num):
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global engine
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engine = create_engine(dburl, echo=echo)
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Base.metadata.drop_all(engine)
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Base.metadata.create_all(engine)
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s = Session(engine)
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for chunk in range(0, num, 10000):
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s.bulk_insert_mappings(
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Customer,
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[
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{
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"name": "customer name %d" % i,
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"description": "customer description %d" % i,
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}
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for i in range(chunk, chunk + 10000)
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],
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)
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s.commit()
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@Profiler.profile
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def test_orm_flush(n):
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"""UPDATE statements via the ORM flush process."""
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session = Session(bind=engine)
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for chunk in range(0, n, 1000):
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customers = (
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session.query(Customer)
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.filter(Customer.id.between(chunk, chunk + 1000))
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.all()
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)
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for customer in customers:
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customer.description += "updated"
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session.flush()
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session.commit()
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