Comment 2 for bug 1578144

Hi Hans,

Thanks for reporting this issue.

On 04-05-16 12:23, Hans Rönnbäck wrote:
> Cacti 0.8.8f which is the default version for Ubuntu 16.04 uses invalid
> datetime values ("0000-00-00 00:00:00"). MySQL 5.7 does not support
> zero-dates,

Are you sure?

Reading the upstream upgrade manual¹, it seems to only do this when you
ask it to (see below). I can't test right now, but isn't this sql_mode
something that you set somewhere? I.e. isn't this something that you
could avoid?

"""
Incompatible change: It is possible for a column DEFAULT value to be
valid for the sql_mode value at table-creation time but invalid for the
sql_mode value when rows are inserted or updated. Example:

SET sql_mode = '';
CREATE TABLE t (d DATE DEFAULT 0);
SET sql_mode = 'NO_ZERO_DATE,STRICT_ALL_TABLES';
INSERT INTO t (d) VALUES(DEFAULT);

In this case, 0 should be accepted for the CREATE TABLE but rejected for
the INSERT. However, previously the server did not evaluate DEFAULT
values used for inserts or updates against the current sql_mode. In the
example, the INSERT succeeds and inserts '0000-00-00' into the DATE column.

As of MySQL 5.7.2, the server applies the proper sql_mode checks to
generate a warning or error at insert or update time.
"""

Paul

¹ http://dev.mysql.com/doc/refman/5.7/en/upgrading-from-previous-series.html