flask框架使用orm连接数据库的方法示例

from flask import Flask
from flask_sqlalchemy import SQLAlchemy
app = Flask(__name__)
app.config["SQLALCHEMY_DATABASE_URI"]="mysql+pymysql://root:@127.0.0.1:3306/learn_flask_mysql"
#注：请勿忘记添加'+pymysql'，否则将会出现没有安装mysqldb的报错
db = SQLAlchemy(app)
@app.route('/')
def hello_world():
  return 'Hello World!'
if __name__ == '__main__':
  app.run()

from learn_flask_mysql_orm import db
class User(db.Model):
  __tablename__ = 'user'
  user_id = db.Column(db.INT,primary_key=True)
  user_name = db.Column(db.TEXT)
  def __init__(self,user_id,user_name):
    self.user_id = user_id
    self.user_name = user_name
  def __str__(self):
    return "id:{}  name:{}".format(self.user_id,self.user_name)

from flask_script import Manager
from models import User
from learn_flask_mysql_orm import app,db
manager = Manager(app)
@manager.command
def save():
  user = User(11,'zhangjia11')
  db.session.add(user)
  db.session.commit()
@manager.command
def query_all():
  users = User.query.all()
  for user in users:
    print(user)
if __name__ == "__main__":
  manager.run()