Rails mysql如何在多列上同時更改時間?

本文翻译自 Rails beginner 查看原文 2011-04-13 165 ruby-on-rails/ mysql/ ruby-on-rails-3/ ruby

In my table I have a column dato that hold a datetime:

在我的表中，我有一個包含datetime的列dato:

2011-04-12 10:37:07
2011-04-12 10:31:07
2011-04-10 10:32:07
2011-04-11 10:45:07
2011-04-12 10:37:07

I want to change all of the dato columns hour to 00:00:00

我想把所有的dato列都改成00:00

How is it done?

它是如何做的?

3 个解决方案

You can do this with the following query

您可以使用以下查詢進行此操作

UPDATE <table> SET <date column>= DATE(<date column>);

E.g.

如。

UPDATE Customer SET startDate = DATE(startDate);

You can do it from the console using the mysql tool.

您可以使用mysql工具在控制台實現。

使用一個查詢在Rails中使用ActiveRecord同時更新多個記錄?

I believe you want to alter multiple records rather than columns. Anyway:

我相信您希望更改多個記錄，而不是列。無論如何:

UPDATE mytable
SET dato = DATE_FORMAT(dato, '%Y-%m-%d 00:00:00');

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