sqlalchemy使用tip
https://docs.sqlalchemy.org/en/latest/orm/tutorial.html
http://docs.sqlalchemy.org/en/latest/core/sqlelement.html
条件过滤操作
#equal
query.filter(User.name == 'ed')
#not equal
query.filter(User.name != 'ed')
#LIKE
query.filter(User.name.like('
