增加：
db.session.add(user)
db.session.commit()
user = User(username=‘mis111‘,password=‘mis1114‘) db.session.add(user) db.session.commit()
查询：
User.query.filter(User.username == ‘mis1114‘).first()
user = User.query.filter(User.username == ‘mis111‘).first() print(user)
修改：
user.password = ‘111111‘
db.session.commit()
user = User.query.filter(User.username == ‘mis111‘).first() user.password = ‘234567‘ db.session.commit()
删除：
db.session.delete(user)
db.session.commit()
user = User.query.filter(User.username == ‘mis111‘).first() db.session.delete(user) db.session.commit()
原文：http://www.cnblogs.com/018linbin/p/7846439.html