Flask入门之SQLAlchemy配置与数据库连接

1. 安装SQLAlchemy

pip install flask-sqlalchemy

2. 导入和配置

from flask_sqlalchemy import SQLAlchemy
basedir = path.dirname(__file__)

app.config.from_pyfile(‘config‘)
app.config[‘SQLALCHEMY_DATABASE_URI‘] =     ‘sqlite:///‘ + path.join(base.dir, ‘data.sqlite‘)
app.config[‘SQLALCHEMY_COMMIT_ON_TEARDOWN‘] = True

3. 创建表类

class Role(db.Model):
    __tablename__ = ‘roles‘
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String, nullable=True)
    users = db.relationship(‘User‘, backref=True)

class User(db.Model):
    __tablename__ = ‘users‘
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String, nullable=True)
    password = db.Column(db.String, devnull=True)
    role_id = db.Column(db.Integer,db.ForeignKey(‘roles.id‘))