以下代码有效，以便创建名为users的新表：
engine = create_engine('mysql+pymysql://root:@localhost/sqlalchemy_tutorial', convert_unicode=True,echo=True)
db_session = scoped_session(sessionmaker(autocommit=False,
autoflush=False,
bind=engine))
Base = declarative_base()
Base.query = db_session.query_property()
Base = declarative_base()
from sqlalchemy import Column, Integer, String
class User(Base):
__tablename__ = 'users'
id = Column(Integer, primary_key=True)
name = Column(String(50), unique=True)
email = Column(String(120), unique=True)
def __init__(self, name=None, email=None):
self.name = name
self.email = email
def __repr__(self):
return '<User %r>' % (self.name)
Base.metadata.create_all(bind=engine)
但是下一个代码没有创建用户表，为什么？
.
├── application.py
├── flaskapp.cfg
├── models
│ ├── User.py
│ ├── __init__.py
│ └── __init__.pyc
└── requirements.txt
初始化的.py
__author__ = 'Ricardo'
from models import User;
User.py
__author__ = 'Ricardo'
from sqlalchemy import Column, Integer, String
from application import Base
class User(Base):
__tablename__ = 'users'
id = Column(Integer, primary_key=True)
name = Column(String(50), unique=True)
email = Column(String(120), unique=True)
def __init__(self, name=None, email=None):
self.name = name
self.email = email
def __repr__(self):
return '<User %r>' % (self.name)
application.py
Base = declarative_base()
Base.query = db_session.query_property()
Base = declarative_base()
import models
#import models.User
#what else?
Base.metadata.create_all(bind=engine)