Sometimes, `DB_CHARSET` will be set to `utf8mb4`, even if the current setup doesn't support `utf8mb4`. After [38442], this can cause significant character set failures, causing the connection to fall back to `latin1`.
Instead of doing this, we now check that the connection supports `utf8mb4` before trying to use it, and fall back to `utf8` when we need to.
Fixes#37982 for trunk.
Built from https://develop.svn.wordpress.org/trunk@38580
git-svn-id: http://core.svn.wordpress.org/trunk@38523 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Previously, `wpdb::get_table_from_query()` would not find the correct table name in the query `DELETE a FROM table a`, due to not recognising the table alias immediately after the `DELETE` as correct syntax.
Fixes#37660.
Built from https://develop.svn.wordpress.org/trunk@38507
git-svn-id: http://core.svn.wordpress.org/trunk@38448 1a063a9b-81f0-0310-95a4-ce76da25c4cd
[37320] corrected some behaviour in how PHP and MySQL character sets are matched up. This was correct, but had the side effect of causing some incorrectly configured sites to start failing.
Prior to [37320], if `DB_CHARSET` was set to `utf8mb4`, but the PHP version didn't support `utf8mb4`, it would fall back to the default character set - usually `latin1`. After [37320], the `SET NAMES` query would force MySQL to treat the connection character set as `utf8mb4`, even if PHP wasn't able to understand it.
By checking if `mysqli_set_charset()` succeeded, we can simulate the old behaviour, while maintaining the fix in [37320].
Props danielkanchev fo helping to diagnose this issue.
Fixes#37689 for trunk.
Built from https://develop.svn.wordpress.org/trunk@38441
git-svn-id: http://core.svn.wordpress.org/trunk@38382 1a063a9b-81f0-0310-95a4-ce76da25c4cd
The logic for determining the appropriate character set and collation to use is becoming more complex, particularly with the recent additions of [37522] and [37523]. As `init_charset()` has side effects, and makes use of constants instead of parameters, it's not possible to unit test this logic.
This commit splits the logic part of `init_charset()` out into a new method, `wpdb::determine_charset()`, along with appropriate unit tests.
See #32105, #37522.
Fixes#36917.
Built from https://develop.svn.wordpress.org/trunk@37601
git-svn-id: http://core.svn.wordpress.org/trunk@37569 1a063a9b-81f0-0310-95a4-ce76da25c4cd
In the event that the database has gone away for some reason, calls to `mysqli_errno()` and `mysqli_error()` (and their `ext/mysql` equivalents, of course), will generate PHP warnings, which are unsightly, and not how we do things in these parts.
Props mbijon, craig-ralston for the original patch.
Fixes#23085.
Built from https://develop.svn.wordpress.org/trunk@37548
git-svn-id: http://core.svn.wordpress.org/trunk@37516 1a063a9b-81f0-0310-95a4-ce76da25c4cd
The `utf8mb4_unicode_520_ci` (Unicode Collation Algorithm 5.2.0, October 2010) collation is an improvement over `utf8mb4_unicode_ci` (UCA 4.0.0, November 2003).
There is no word on when MySQL will support later UCAs.
Fixes#32105.
Built from https://develop.svn.wordpress.org/trunk@37523
git-svn-id: http://core.svn.wordpress.org/trunk@37491 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Some sites prefer to use locale-specific location settings. For example, the Swedish WordPress package use `utf8_swedish_ci`, instead of `utf8_unicode_ci`. When upgrading the connection to `utf8mb4`, we were overriding this to be `utf8mb4_unicode_ci`, instead of maintaining the use of the `_swedish_ci` variant.
The locale-specific collations do have extra collation rules just for that language, so it's useful to maintain compatibility.
Fixes#32405.
Built from https://develop.svn.wordpress.org/trunk@37521
git-svn-id: http://core.svn.wordpress.org/trunk@37489 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Also use 'back-compat' in some inline comments where backward compatibility is the subject and shorthand feels more natural.
Note: 'backwards compatibility/compatibile' can also be considered correct, though it's primary seen in regular use in British English.
Props ocean90.
Fixes#36835.
Built from https://develop.svn.wordpress.org/trunk@37431
git-svn-id: http://core.svn.wordpress.org/trunk@37397 1a063a9b-81f0-0310-95a4-ce76da25c4cd
If `DB_CHARSET` isn't defined (or is empty), `wpdb::$charset` will be empty, too. `wpdb::strip_invalid_text()` assumes that it isn't empty, however, so we need to fall back to the connection character set when we're running our sanity checks.
Fixes#34708.
Built from https://develop.svn.wordpress.org/trunk@35655
git-svn-id: http://core.svn.wordpress.org/trunk@35619 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Specifically, `::insert()`, `::replace()`, `::update()`, and `::delete()` can now set a column to `NULL`, or add the `IS NULL` condition to the `WHERE` clause.
This is based on [backpress 279].
Props pento, nbachiyski, sorich87.
Fixes#15158.
Built from https://develop.svn.wordpress.org/trunk@34737
git-svn-id: http://core.svn.wordpress.org/trunk@34701 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Previously, we'd run the sanity checks if `is_mysql` was not set to `false`. This caused problems for DB drop-ins that didn't define `is_mysql` at all. Instead, we can just check if `is_mysql` is `empty()`.
Also fix some unit tests that accidently ran correctly because of the strict `false ===` comparison.
Fixes#33501.
Built from https://develop.svn.wordpress.org/trunk@34655
git-svn-id: http://core.svn.wordpress.org/trunk@34619 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Adds a new table to the database schema (`wp_termmeta`), and a set of
`*_term_meta()` API functions. `get_terms()` and `wp_get_object_terms()`
now also support 'meta_query' parameters, with syntax identical to other
uses of `WP_Meta_Query`.
When fetching terms via `get_terms()` or `wp_get_object_terms()`, metadata for
matched terms is preloaded into the cache by default. Disable this behavior
by setting the new `$update_term_meta_cache` paramater to `false`.
To maximize performance, within `WP_Query` loops, the termmeta cache is *not*
primed by default. Instead, we use a lazy-loading technique: metadata for all
terms belonging to posts in the loop is loaded into the cache the first time
that `get_term_meta()` is called within the loop.
Props boonebgorges, sirzooro.
See #10142.
Built from https://develop.svn.wordpress.org/trunk@34529
git-svn-id: http://core.svn.wordpress.org/trunk@34493 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This change does the following things
* Allows utf8mb4 for the MySQL extension
* Re-runs the utf8->utf8mb4 conversion for single sites, this will do nothing for tables already converted
* Re-runs the utf8->utf8mb4 conversion for global tables in multisite when the environment supports utf8mb4
* Removes upgrade_420() calling as upgrade_430() will perform those changes now instead
The index shortenings should have still taken place on utf8 sites previously, so there's no need to run those again.
Props kovshenin, pento, dd32
Fixes#32127 for trunk.
Built from https://develop.svn.wordpress.org/trunk@33055
git-svn-id: http://core.svn.wordpress.org/trunk@33026 1a063a9b-81f0-0310-95a4-ce76da25c4cd
