PHP + MySQL队列 [英] PHP + MySQL Queue

问题描述

我需要一个充当队列的简单表. 我的MySQL服务器限制是我不能使用InnoDB表，只能使用MyISAM.

I need a simple table that acts as a Queue. My MySQL server restriction is I can't use InnoDB tables, only MyISAM.

客户/工人将同时工作，并且每次都需要获得不同的工作.

Clients/workers will work at the same time and they will need to receive differents jobs each time.

我的想法是执行以下操作(伪代码):

My idea is to do the following (pseudo-code):

$job <- SELECT * FROM queue ORDER BY last_pop ASC LIMIT 1;
UPDATE queue SET last_pop WHERE id = $job->id
return $job

我曾经尝试过使用表锁和"GET_LOCK"，但是什么也没发生，工人有时会得到相同的工作.

I had tried table lock and "GET_LOCK" but nothing happends, workers sometimes receives same jobs.

推荐答案

您需要调换顺序，以便没有计时窗口.

消费者POP(每个消费者都有一个唯一的$ consumer_id)

Consumer POP (each consumer has a unique $consumer_id)

Update queue 
set last_pop = '$consumer_id' 
where last_pop is null 
order by id limit 1;

$job = 
  Select * from queue 
  where last_pop = '$consumer_id' 
  order by id desc 
  limit 1;

供应商推送

insert into queue 
  (id, last_pop, ...) 
values 
  (NULL, NULL, ...);

队列由id列按时间排序，并根据POP分配给consumer_id.

The queue is ordered in time by the id column and assigned upon POP by to the consumer_id.

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