flask-sqlalchemy 关系表简单操作

from flask import Flaskfrom flask.ext.sqlalchemy import SQLAlchemyfrom flask.ext.migrate import Migrate, MigrateCommandfrom flask.ext.script import Manager

app = Flask(__name__)app.config[‘SQLALCHEMY_DATABASE_URI‘] = ‘sqlite:///test.db‘db = SQLAlchemy(app)

migrate = Migrate(app, db)

manager = Manager(app)manager.add_command(‘db‘, MigrateCommand)

class Post(db.Model):    id = db.Column(db.Integer, primary_key=True)    name = db.Column(db.String(80))

    category_id = db.Column(db.Integer, db.ForeignKey(‘category.id‘))    category = db.relationship(‘Category‘,                               backref=db.backref(‘posts‘, lazy=‘dynamic‘))

class Category(db.Model):    id = db.Column(db.Integer, primary_key=True)    password = db.Column(db.String(50))

@manager.commanddef run():    app.debug = True    app.run()

if __name__ == ‘__main__‘:    manager.run()

# test# c1 = Category(password = ‘pass1‘)# p1 = Post(name=‘name1‘,category=c1)# db.session.add(p1)# db.session.commit()## p1 = db.session.query(Category).one()# print p1.id == 1# print p1.posts.one().name == ‘name1‘# print p1.posts.all()[0].name ==‘name1‘