#coding:utf8

 from flask import Flask

 from flask_sqlalchemy import SQLAlchemy

 app = Flask(__name__)

 # 设置链接数据库的url

 app.config['SQLALCHEMY_DATABASE_URI']='mysql://root:mysql@127.0.0.1:3306/flask'

 # 每次请求结束后自动提交数据

 app.config['SQLALCHEMY_COMMIT_ON_TEAMDOWN'] = True

 app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = True

 # 查询时会显示原始的sql语句

 app.config['SQLALCHEMY_ECHO'] = True

 # 注册数据库

 db = SQLAlchemy(app)

 class Role(db.Model):

     # 定义表名

     __tablename__ = 'roles'

     # 定义列对象

     id = db.Column(db.Integer,primary_key=True)

     name = db.Column(db.String(64),unique=True)

     # 关系字段 用于两个方向查

     user = db.relationship('User',backref='rel')

     # repr() 方法现实一个可读字符串

     def __repr__(self):

         return str(self.name)

 class User(db.Model):

     __tablename__ = 'users'

     id = db.Column(db.Integer,primary_key=True)

     name = db.Column(db.String(64),unique=True,index=True)

     email = db.Column(db.String(64),unique=True)

     pswd = db.Column(db.String(64))

     role_id = db.Column(db.Integer,db.ForeignKey("roles.id"))

     def __repr__(self):

         return str(self.name)

 if __name__ == '__main__':

     db.drop_all()   # 删除表

     db.create_all() # 创建表

     ro1 = Role(name = 'admin')  # 创建对象

     ro2 = Role(name = 'user' )

     # 向数据库添加数据

     db.session.add_all([ro1,ro2])

     # 提交

     # db.session.commit()

     us1 = User(name='wang', email='wang@163.com', pswd='', role_id=ro1.id)

     us2 = User(name='zhang', email='zhang@189.com', pswd='', role_id=ro2.id)

     us3 = User(name='chen', email='chen@126.com', pswd='', role_id=ro2.id)

     us4 = User(name='zhou', email='zhou@163.com', pswd='', role_id=ro1.id)

     db.session.add_all([us1, us2, us3, us4])

     db.session.commit()

     app.run(debug=True)