通过用户模型，对数据库进行增删改查操作

增加：
user = 
db.session.add(user)
db.session.commit()

查询：
User.query.filter(User.username == 'mis1114').first()

修改：
user.password = '111111'
db.session.commit()

删除：
db.session.delete(user)
db.session.commit()

from flask import Flask
from flask_sqlalchemy import SQLAlchemy
import config

app = Flask(__name__)
app.config.from_object("config")

db=SQLAlchemy(app)

class User(db.Model):
    __tablename__ = "user"
    id = db.Column(db.Integer,primary_key=True,autoincrement=True)
    username = db.Column(db.String(20),nullable=False)
    password = db.Column(db.String(20),nullable=False)
    nickname = db.Column(db.String(20))
#db.create_all()

# user = User(username='micssa',password='213232')
# db.session.add(user)
# db.session.commit()
#
# user = User(username='mic45878',password='2222222')
# db.session.add(user)
# db.session.commit()     #增加


# user=User.query.filter(User.username=='micssa').first()
# print(user.id,user.username,user.password)     #查找

user=User.query.filter(User.username=='micssa').first()
user.password = '111111'
db.session.commit()         #修改

# user=User.query.filter(User.username=='micssa').first()
# db.session.delete(user)
# db.session.commit()        #删除

@app.route('/')
def hello_world():
    return 'Hello World!'

if __name__ == '__main__':
    app.run()

SQLALCHEMY_DATABASE_URI = 'mysql+pymysql://root:@127.0.0.1:3306/mis_db?charset=utf8'
SQLALCHEMY_TRACK_MODIFICATIONS = False