11.15

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

# 增加数据
user = User(username = 'vae',password = '5201314')
db.session.add(user)
db.session.commit()

 

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

# 查询数据
user = User.query.filter(User.username == 'vae').first()
print(user.username,user.password)

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

user.password = '250250'
print(user.username,user.password)
db.session.commit()

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