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.
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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.
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[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.
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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.
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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.
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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.
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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.
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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.
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If `DB_CHARSET` isn't defined (or is empty), `wpdb::$charset` will be empty, too. `wpdb::strip_invalid_text()` assumes that it isn't empty, however, so we need to fall back to the connection character set when we're running our sanity checks.
Fixes#34708.
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Specifically, `::insert()`, `::replace()`, `::update()`, and `::delete()` can now set a column to `NULL`, or add the `IS NULL` condition to the `WHERE` clause.
This is based on [backpress 279].
Props pento, nbachiyski, sorich87.
Fixes#15158.
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Previously, we'd run the sanity checks if `is_mysql` was not set to `false`. This caused problems for DB drop-ins that didn't define `is_mysql` at all. Instead, we can just check if `is_mysql` is `empty()`.
Also fix some unit tests that accidently ran correctly because of the strict `false ===` comparison.
Fixes#33501.
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Adds a new table to the database schema (`wp_termmeta`), and a set of
`*_term_meta()` API functions. `get_terms()` and `wp_get_object_terms()`
now also support 'meta_query' parameters, with syntax identical to other
uses of `WP_Meta_Query`.
When fetching terms via `get_terms()` or `wp_get_object_terms()`, metadata for
matched terms is preloaded into the cache by default. Disable this behavior
by setting the new `$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.
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