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WPDB: If a site is using the utf8 charset, and their version of MySQL supports utf8mb4, auto-upgrade them to utf8mb4.

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This patch also resizes some indexes, to allow for the 767 byte index size limit in standard MySQL installs.

See #21212



git-svn-id: https://develop.svn.wordpress.org/trunk@31349 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Gary Pendergast
2015-02-06 04:50:19 +00:00
parent 43789f822a
commit 9f6ddf8944
6 changed files with 151 additions and 25 deletions
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25
src/wp-admin/includes/schema.php
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@@ -44,6 +44,13 @@ function wp_get_db_schema( $scope = 'all', $blog_id = null ) {
// Engage multisite if in the middle of turning it on from network.php.
$is_multisite = is_multisite() || ( defined( 'WP_INSTALLING_NETWORK' ) && WP_INSTALLING_NETWORK );
/*
* Indexes have a maximum size of 767 bytes. Historically, we haven't need to be concerned about that.
* As of 4.2, however, we moved to utf8mb4, which uses 4 bytes per character. This means that an index which
* used to have room for floor(767/3) = 255 characters, now only has room for floor(767/4) = 191 characters.
*/
$max_index_length = 191;
// Blog specific tables.
$blog_tables = "CREATE TABLE $wpdb->terms (
term_id bigint(20) unsigned NOT NULL auto_increment,
@@ -51,8 +58,8 @@ function wp_get_db_schema( $scope = 'all', $blog_id = null ) {
slug varchar(200) NOT NULL default '',
term_group bigint(10) NOT NULL default 0,
PRIMARY KEY (term_id),
KEY slug (slug),
KEY name (name)
KEY slug (slug($max_index_length)),
KEY name (name($max_index_length))
) $charset_collate;
CREATE TABLE $wpdb->term_taxonomy (
term_taxonomy_id bigint(20) unsigned NOT NULL auto_increment,
@@ -79,7 +86,7 @@ CREATE TABLE $wpdb->commentmeta (
meta_value longtext,
PRIMARY KEY (meta_id),
KEY comment_id (comment_id),
KEY meta_key (meta_key)
KEY meta_key (meta_key($max_index_length))
) $charset_collate;
CREATE TABLE $wpdb->comments (
comment_ID bigint(20) unsigned NOT NULL auto_increment,
@@ -136,7 +143,7 @@ CREATE TABLE $wpdb->postmeta (
meta_value longtext,
PRIMARY KEY (meta_id),
KEY post_id (post_id),
KEY meta_key (meta_key)
KEY meta_key (meta_key($max_index_length))
) $charset_collate;
CREATE TABLE $wpdb->posts (
ID bigint(20) unsigned NOT NULL auto_increment,
@@ -163,7 +170,7 @@ CREATE TABLE $wpdb->posts (
post_mime_type varchar(100) NOT NULL default '',
comment_count bigint(20) NOT NULL default '0',
PRIMARY KEY (ID),
KEY post_name (post_name),
KEY post_name (post_name($max_index_length)),
KEY type_status_date (post_type,post_status,post_date,ID),
KEY post_parent (post_parent),
KEY post_author (post_author)
@@ -213,7 +220,7 @@ CREATE TABLE $wpdb->posts (
meta_value longtext,
PRIMARY KEY (umeta_id),
KEY user_id (user_id),
KEY meta_key (meta_key)
KEY meta_key (meta_key($max_index_length))
) $charset_collate;\n";
// Global tables
@@ -261,7 +268,7 @@ CREATE TABLE $wpdb->site (
domain varchar(200) NOT NULL default '',
path varchar(100) NOT NULL default '',
PRIMARY KEY (id),
KEY domain (domain,path)
KEY domain (domain(140),path(51))
) $charset_collate;
CREATE TABLE $wpdb->sitemeta (
meta_id bigint(20) NOT NULL auto_increment,
@@ -269,7 +276,7 @@ CREATE TABLE $wpdb->sitemeta (
meta_key varchar(255) default NULL,
meta_value longtext,
PRIMARY KEY (meta_id),
KEY meta_key (meta_key),
KEY meta_key (meta_key($max_index_length)),
KEY site_id (site_id)
) $charset_collate;
CREATE TABLE $wpdb->signups (
@@ -288,7 +295,7 @@ CREATE TABLE $wpdb->signups (
KEY activation_key (activation_key),
KEY user_email (user_email),
KEY user_login_email (user_login,user_email),
KEY domain_path (domain,path)
KEY domain_path (domain(140),path(51))
) $charset_collate;";
switch ( $scope ) {