upgrade.php dies hard on MySQL < 4.1.0

[miqrogroove]

Need to revert some of [12409]

MySQL 4.1.0 is required to execute SET NAMES, and as a result WP 2.9 upgrader never loads on old servers. This leaves webmasters unaware of the version incompatibility.

[Denis-de-Bernardy]

mm, it shouldn't even go so far that it actually lets the webmaster think he's fine. the upgrader should bail without upgrading the DB if the php and mysql versions are not met.

[miqrogroove]

Agreed. My patch enables mysql version checking. Without it, the webmaster will only get a blank screen or internal server error.

[ryan]

(In [12573]) Don't set charset if mysql version does not have the collation cap. Props miqrogroove. see #11666 for trunk

[ryan]

(In [12574]) Don't set charset if mysql version does not have the collation cap. Props miqrogroove. see #11666 for 2.9k

[ryan]

(In [12575]) Check PHP and MySQL versions in upgrade.php. see #11666

[ryan]

(In [12576]) Check PHP and MySQL versions in upgrade.php. see #11666 for 2.9

[ryan]

Added some quick checks to upgrade.php.

[automattor]

(In [12578]) Check PHP and MySQL versions in install.php. see #11666 for 2.9

[ryan]

[12577] for trunk.

[ryan]

Good enough for now.

[hakre]

Another way to signal changes is to offer the changelog to the user: #11739