python3 mysql 时间参数错误

Posted 2021-01-26 Medivh

一、环境

    mac OS + python3.6 + pymysql

二、执行

1、语句

select count(user_id)
from chezhubangapppp.yfq_user
where register_dt between ‘2018-11-01‘ and ‘2018-12-01‘;

 

写成这样直接会报错，说between and之间必须是时间类型

2、修改后

"select count(user_id) from chezhubangapppp.yfq_user where register_dt between str_to_date(‘%s‘, ‘%Y-%m-%d‘) and str_to_date(‘%s‘, ‘%Y-%m-%d‘);" % (‘2018-11-01‘, ‘2018-12-01‘)

报错

ValueError: unsupported format character ‘Y‘ (0x59) at index 98

为啥？因为python执行的sql中存在类似DATE_FORMAT(CREATE_TIME, ‘%Y-%m-%d’) 的写法,与其中%Y与python的参数%s冲突

三、结论

修改后的结果

select count(user_id) from chezhubangapppp.yfq_user where register_dt between str_to_date(‘%s‘, ‘%%Y-%%m-%%d‘) and str_to_date(‘%s‘, ‘%%Y-%%m-%%d‘)" % (‘2018-11-01‘, ‘2018-12-01‘)