[RDD] Ubuntu 16.04 - and at the end the font...

Rob Landry 41001140 at interpring.com
Wed Jun 1 07:13:26 EDT 2016

Is there a reason why date/time columns in Rivendell are set to NOT NULL?

I suppose it's a good thing that the latest version of CentOS seems to 
come with MariaDB instead of MySQL.


Я там, где ребята толковые,
Я там, где плакаты "Вперёд",
Где песни рабочие новые
Страна трудовая поёт.

On Tue, 31 May 2016, Wayne Merricks wrote:

> The problem is not what value but the way it handles NULL values when the 
> column is set to NOT NULL.
> In older versions, NULL or no value set on a date or time or datetime just 
> becomes 0000-00-00 00:00:00 (or a variation).  In 5.7 it errors saying "this 
> can't be NULL" and just stops.
> I've just updated the github issue (121).  Thankfully the only place I've 
> found (after a lot of searching) that breaks are the *_LOG and LOGS tables 
> (there are some others but the code that deals with them explicitly sets 
> date/time/datetime values).
> The sticking point is I'm not sure how Riv decides what happens with LOG 
> start/stop dates that are in the past (it obviously was fine with 
> 0000-00-00).  More importantly I don't yet know how it purges logs (again 
> because 0000-00-00 doesn't seem to get purged).  Unfortunately, MySQL v5.7 
> doesn't let you set a default date as 0000-00-00 (it says invalid date).
> So yeah I'm carefully trying to make changes without breaking stuff.
> On 2016-05-31 21:18, Rob Landry wrote:
>> On Fri, 27 May 2016, Wayne Merricks wrote:
>>> There are quite a few different database issues with Rivendell where older 
>>> versions of MySQL implied NULL values or converted NULL dates to 
>>> 0000-00-00 00:00:00 but with MySQL v5.7 you can't do that any more (at 
>>> best 0000-00-00 gives you an invalid date error).
>> So, if you add a record to a table containing a date field without
>> specifying a value for that field, what value does MySQL 5.7 assume?
>> Rob
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