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POSqlAlchemy Migrate Declarative
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6786227
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2011-07-22T06:05:03.233
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2011-07-22T15:36:34.117
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2011-07-22T15:34:38.577
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<p>I've modified the tutorial on the SqlAlchemy-Migrate <a href="http://packages.python.org/sqlalchemy-migrate/versioning.html#edit-the-change-script" rel="noreferrer">tutorial</a> to declarative syntax for my Pylons Pyramid project. I can successfully upgrade and downgrade, but I'm concerned about the <code>Base.metadata.drop_all</code>(migrate_engine) command below. Here is my migration file:</p> <pre><code>from sqlalchemy import Column from sqlalchemy.types import Integer, String, DateTime from sqlalchemy.sql import func from sqlalchemy.ext.declarative import declarative_base from sqlalchemy.orm import scoped_session, sessionmaker from zope.sqlalchemy import ZopeTransactionExtension DBSession = scoped_session(sessionmaker(extension=ZopeTransactionExtension())) Base = declarative_base() class User(Base): __tablename__ = 'users' id = Column(Integer, primary_key=True) email = Column(String(75), unique=True) fullname = Column(String(60)) password = Column(String(51)) last_login = Column(DateTime) date_joined = Column(DateTime, default=func.now()) def upgrade(migrate_engine): # Upgrade operations go here. Don't create your own engine; bind migrate_engine # to your metadata Base.metadata.bind = migrate_engine Base.metadata.create_all(migrate_engine) # IS THIS DANGEROUS? def downgrade(migrate_engine): # Operations to reverse the above upgrade go here. Base.metadata.bind = migrate_engine Base.metadata.drop_all(migrate_engine) # IS THIS DANGEROUS? </code></pre> <p>[edit] My question was how to individually create tables. I didn't know this was my question until asking the wrong question enough, to get to the correct question.</p>
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<python><orm><sqlalchemy><pylons><pyramid>
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SqlAlchemy Migrate Declarative
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