增加：
user =
db.session.add(user)
db.session.commit()
#增加
user=User(username='mis1234',password='111111')
db.session.add(user)
db.session.commit()
查询：
User.query.filter(User.username == 'mis1114').first()
#查询
user = User.query.filter(User.username == 'mis1234').first()
print(user.id,user.password)
修改：
user.password = '111111'
db.session.commit()
#修改
user = User.query.filter(User.username=='mis114').first()
user.password='499679642'
db.session.commit()
删除：
db.session.delete(user)
db.session.commit()
#删除
user = User.query.filter(User.username == 'mis1234').first()
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()
#增加
user=User(username='mis114',password='111111')
db.session.add(user)
db.session.commit()
#查询
user = User.query.filter(User.username == 'mis1234').first()
print(user.id,user.password)
#修改
user = User.query.filter(User.username=='mis114').first()
user.password='499679642'
db.session.commit()
#删除
user = User.query.filter(User.username == 'mis1234').first()
db.session.delete(user)
db.session.commit()
@app.route('/')
def hello_world():
return 'Hello World!'
if __name__ == '__main__':
app.run()
