在MySQL中将日期/时间字符串转换为Unix时间戳 [英] Converting date/time string to unix timestamp in MySQL

问题描述

我们有一个数据库，其中所有日期和时间都存储在称为时间戳的列中. 时间戳"列中的日期/时间格式为:08 Aug，08:10am.

We have a database with all the dates and times stored in one column called timestamp. The format of the date/time in the column "timestamp" is as: 03 Aug 08:10am.

我想在MySQL(而不是PHP)中将此(03 Aug 08:10 am)转换为UNIX TIMESTAMP，因为我们已经有超过500行采用以下格式:03 Aug 08:10 am.

I would like to convert this (03 Aug 08:10am) to UNIX TIMESTAMP in MySQL and not PHP because we already have over 500 rows with this format: 03 Aug 08:10am.

我尝试创建一个名为new_timestamp的新INT列并运行此查询:

I tried create a new INT column called new_timestamp and ran this query:

UPDATE table_name SET new_timestamp = UNIX_TIMESTAMP(timestamp);

但是，它表明有0行受到影响.

However, it shows that 0 rows were affected.

这不是重复的内容，请勿将我重定向到如何在PHP中进行转换.首先阅读问题:)

推荐答案

UNIX_TIMESTAMP()函数需要有效的日期/时间格式才能正确转换，因此您需要将现有的日期/时间格式转换为有效/可识别的格式(包括年份)第一.您可以使用MySQL的STR_TO_DATE()函数执行此操作，告诉它您要传入的格式，并以硬编码的年份值进行连接，因为在您的情况下始终为2016.

The UNIX_TIMESTAMP() function requires a valid date/time format to convert correctly, so you need to convert your existing date/time format to a valid/recognised format (including the year) first. You can do this using MySQL's STR_TO_DATE() function, telling it what format you are passing in, and concatenating in a hard-coded year value as it's always 2016 in your case.

STR_TO_DATE(CONCAT('2016-', <your date/time value>), '%Y-%d %b %h:%i%p')

然后，您可以使用UNIX_TIMESTAMP()函数将该有效日期转换为您的unix时间戳，并在一个步骤中更新所有这些记录:

You can then use the UNIX_TIMESTAMP() function to convert that valid date to your unix timestamp and update all those records in a single step:

UPDATE table_name
   SET new_timestamp = 
       UNIX_TIMESTAMP(STR_TO_DATE(CONCAT('2016-', timestamp), '%Y-%d %b %h:%i%p'));

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