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redis - How does PHP prevent multiple processes from operating the same resource at the same time?

How does PHP prevent multiple processes from operating the same resource at the same time? For example: flash sale products in the mall? Stock lock? Avoid oversold inventory? What is the principle?

滿天的星座 2017-05-16 13:18:57

php - How to implement shared product inventory between two mall projects?

There are two opencart shopping mall projects that need to share the inventory fields of the same product table. Other fields may be different. How to design the database?

怪我咯 2017-05-16 13:15:23

Find users who visit only one city instead of multiple cities in MySQL [duplicate]

I have a table with user ID, city and booking date. I need to find out which users visited only one city within a date range, not multiple cities. SELECT user_id, city, COUNT(*) as result FROM visits WHERE start_ts >= 1675209600 -- 1675209600=01.02.2023 00:00 AND end_ts <= 1675295999 -

P粉764785924 2023-07-24 22:47:07

javascript - City selector in those websites

Many websites have city selectors. How are these components maintained? Is there any city database available? Now I need to use the city selector in my website, and I use element UI. This UI does not seem to be integrated. I would like to ask where to get the city data? Or is there any...

给我你的怀抱 2017-05-19 10:34:02

Teacher, how to download the source code of the mall?

Teacher, how to download the source code of the mall?

闲云 2017-07-28 21:38:46

How to do multi-condition filtering in PHP mall?

How to do multi-condition filtering in PHP mall?

tianya 2018-03-06 13:46:15

mysql - Newbie thinkphp mall design issues

1. Once a mall user purchases a product and generates an order, the mall inventory is modified. Should the database data be modified directly at this time, or should the inventory value of the product be cached first, and then the cached value be modified globally and then written to the database at...

阿神 2017-05-16 13:03:36

Points mall, an interface for redeeming points

In the Points Mall, does anyone have time to write down how to redeem points for goods?

／ 2019-07-26 11:08:27

How to design the coupon database table of the mall?

How to design the coupon database table of the mall?

黄埔竹下 2018-04-27 13:31:56

Want to locate the location of the search city after searching

Want to locate the location of the search city after searching

懒货 2020-04-11 09:53:48

Is there a simple and easy-to-understand source code file for downloading the mall? It would be better to have a database.

Is there a simpler, easier-to-understand source code file for the mall to download, which would be better if it has a database? Is there a simpler, easier-to-understand mall source code file for download, which would be better if it has a database? Is there a simpler, easier-to-understand mall sourc...

万般ㄞ莫离 2019-08-24 17:28:38