mirror of
https://github.com/sqlalchemy/sqlalchemy.git
synced 2026-05-15 13:17:24 -04:00
Mike Bayer
1e278de4cc
Applied on top of a pure run of black -l 79 in I7eda77fed3d8e73df84b3651fd6cfcfe858d4dc9, this set of changes resolves all remaining flake8 conditions for those codes we have enabled in setup.cfg. Included are resolutions for all remaining flake8 issues including shadowed builtins, long lines, import order, unused imports, duplicate imports, and docstring issues. Change-Id: I4f72d3ba1380dd601610ff80b8fb06a2aff8b0fe
65 lines
1.6 KiB
Python
65 lines
1.6 KiB
Python
"""This series of tests illustrates different ways to UPDATE a large number
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of rows in bulk.
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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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