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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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src/wp-admin/includes/upgrade.php
+86
View File
@@ -519,6 +519,9 @@ function upgrade_all() {
if ( $wp_current_db_version < 29630 )
upgrade_400();
if ( $wp_current_db_version < 31349 )
upgrade_420();
maybe_disable_link_manager();
maybe_disable_automattic_widgets();
@@ -1406,6 +1409,27 @@ function upgrade_400() {
}
}
/**
* Execute changes made in WordPress 4.2.0.
*
* @since 4.2.0
*/
function upgrade_420() {
global $wp_current_db_version, $wpdb;
if ( $wp_current_db_version < 31349 && $wpdb->charset === 'utf8mb4' ) {
if ( is_multisite() ) {
$tables = $wpdb->tables( 'blog' );
} else {
$tables = $wpdb->tables( 'all' );
}
foreach ( $tables as $table ) {
maybe_convert_table_to_utf8mb4( $table );
}
}
}
/**
* Executes network-level upgrade routines.
*
@@ -1502,6 +1526,21 @@ function upgrade_network() {
update_site_option( 'illegal_names', $illegal_names );
}
}
// 4.2
if ( $wp_current_db_version < 31349 && $wpdb->charset === 'utf8mb4' ) {
if ( ! ( defined( 'DO_NOT_UPGRADE_GLOBAL_TABLES' ) && DO_NOT_UPGRADE_GLOBAL_TABLES ) ) {
$wpdb->query( "ALTER TABLE $wpdb->site DROP INDEX domain, ADD INDEX domain(domain(140),path(51))" );
$wpdb->query( "ALTER TABLE $wpdb->sitemeta DROP INDEX meta_key, ADD INDEX meta_key(meta_key(191))" );
$wpdb->query( "ALTER TABLE $wpdb->signups DROP INDEX domain, ADD INDEX domain(domain(140),path(51))" );
$tables = $wpdb->tables( 'global' );
foreach ( $tables as $table ) {
maybe_convert_table_to_utf8mb4( $table );
}
}
}
}
//
@@ -1607,6 +1646,42 @@ function maybe_add_column($table_name, $column_name, $create_ddl) {
return false;
}
/**
* If a table only contains utf8 or utf8mb4 columns, convert it to utf8mb4.
*
* @since 4.2.0
*
* @param string $table The table to convert.
* @return bool true if the table was converted, false if it wasn't.
*/
function maybe_convert_table_to_utf8mb4( $table ) {
global $wpdb;
$results = $wpdb->get_results( "SHOW FULL COLUMNS FROM `$table`" );
if ( ! $results ) {
return false;
}
$has_utf8 = false;
foreach ( $results as $column ) {
if ( $column->Collation ) {
if ( 'utf8' === $column->Collation ) {
$has_utf8 = true;
} elseif ( 'utf8mb4' !== $column->Collation ) {
// Don't upgrade tables that have non-utf8 columns.
return false;
}
}
}
if ( ! $has_utf8 ) {
// Don't bother upgrading tables that don't have utf8 columns.
return false;
}
return $wpdb->query( "ALTER TABLE $table CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci" );
}
/**
* Retrieve all options as it was for 1.2.
*
@@ -2284,6 +2359,17 @@ function pre_schema_upgrade() {
// dbDelta() can recreate but can't drop the index.
$wpdb->query( "ALTER TABLE $wpdb->terms DROP INDEX slug" );
}
// Upgrade versions prior to 4.2.
if ( $wp_current_db_version < 31349 ) {
// So that we can change tables to utf8mb4, we need to shorten the index lengths to less than 767 bytes
$wpdb->query( "ALTER TABLE $wpdb->usermeta DROP INDEX meta_key, ADD INDEX meta_key(meta_key(191))" );
$wpdb->query( "ALTER TABLE $wpdb->terms DROP INDEX slug, ADD INDEX slug(slug(191))" );
$wpdb->query( "ALTER TABLE $wpdb->terms DROP INDEX name, ADD INDEX name(name(191))" );
$wpdb->query( "ALTER TABLE $wpdb->commentmeta DROP INDEX meta_key, ADD INDEX meta_key(meta_key(191))" );
$wpdb->query( "ALTER TABLE $wpdb->postmeta DROP INDEX meta_key, ADD INDEX meta_key(meta_key(191))" );
$wpdb->query( "ALTER TABLE $wpdb->posts DROP INDEX post_name, ADD INDEX post_name(post_name(191))" );
}
}
/**