when a user uses Ctrl+F5 to force a page refresh, the css js html file is reloaded. if the css js html file is not modified, it will take a long time to reload. after looking up the data, you can determine whether the file has been updated by adding...
SELECT COUNT (*) AS num FROM test WHERE ( a = 111AND cid = 21432 OR s_status < > yes OR t_status < > yes ) AND test . delete_time IS NULL LIMIT 1 explain the statement type is displayed as ALL. How to optimize it? ...
because of my interest, I am working on a web application in my spare time. At present, I have a big performance problem. I would like to consult you here. I hope you will not hesitate to give me your advice. there are two tables, one is the exchange ...
select * from a where aa=1 and bb=2; select * from a where in (select id from a where aa=1 and bb=2); ...
A crawler was used before hanging up, and an error of 2006-MySQL server has gone away occurred when entering the library. According to Baidu, change the my.conf file max_allowed_packet=500M wait_timeout=288000 After interactive_timeout = 288000 , t...
for example, the golang compiler does not always get the address of the value type Integer int func (i *Integer) pretty(){ } Integer(25).pretty() ask for advice, why do you say so, under what circumstances can t you find the pointer, and wha...
I wrote def recursive_function_cache(func): cache = dict() def wrapper(*args, **kwargs): parameters = (tuple.__repr__(args), dict.__repr__(kwargs)) if parameters not in cache: cache.update({parameters : func(...
problem description question: every time I click the add button, I add a row of data. According to boostrap-table s api rule, every time the added data is in the last row, requirement: can the added data be in the first row? the environmental back...
wrote a vue toast plug-in: vue-cli 3. 0 used by vue-toast-arif , but not available after publishing to npm. after careful inspection, it is found that there is a package.json path problem first of all, my directory structure is: package.json i...
Click input, then input should be on top of the keyboard, and then type. Yes, no problem on android. but it appears in safari: there is no input on the keyboard. how to solve this problem? ...