from sqlalchemy import create_engine
engine = create_engine('postgresql://user:password@hostname/database')
2. 定义一个sql语句用于创建视图
view_sql = """
CREATE VIEW myview AS
SELECT column1, column2, ...
FROM mytable
WHERE condition;
3. 使用engine.execute()方法执行sql语句
engine.execute(view_sql)
4. 使用ORM定义一个映射类，该类对应于视图
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import Column, Integer, String
Base = declarative_base()
class MyView(Base):
__tablename__ = 'myview'
column1 = Column(String)
column2 = Column(Integer)
5. 使用session查询视图
from sqlalchemy.orm import sessionmaker
Session = sessionmaker(bind=engine)
session = Session()
result = session.query(MyView).all()
这样就可以在Python sqlalchemy中创建视图并使用ORM查询视图了。
