轮询MySQL表中新行的最快方法是什么? [英] What's the fastest way to poll a MySQL table for new rows?

问题描述

我的应用程序需要轮询MySQL数据库以查找新行.每次添加新行时，都应检索它们.我正在考虑创建一个触发器，以将对新行的引用放置在单独的表上.原始表有超过300,000行.

My application needs to poll a MySQL database for new rows. Every time new rows are added, they should be retrieved. I was thinking of creating a trigger to place references to new rows on a separate table. The original table has over 300,000 rows.

该应用程序是用PHP构建的.

The application is built in PHP.

一些好的答案，我认为这个问题值得赏识.

Some good answers, i think the question deserves a bounty.

推荐答案

对于外部应用程序，我发现使用TimeStamp列是一种更强大的方法，与自动id和其他主键问题无关

For external applications I find using a TimeStamp column is a more robust method that is independent of auto id and other primary key issues

将列添加到表中，例如:

Add columns to the tables such as:

insertedOn TIMESTAMP DEFAULT CURRENT_TIMESTAMP

或跟踪插入和更新

updatedOn TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP

在外部应用程序中，您要做的只是跟踪进行轮询时的最后一个时间戳.然后从该时间戳中选择所有相关表.在大型表中，您可能需要索引时间戳列

In the external application all you need to do is track the last timestamp when you did a poll. Then select from that timestamp forward on all the relevant tables. In large tables you may need to index the timestamp column

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