Question

wp_upgrade()

Runs WordPress Upgrade functions.

---

description

Upgrades the database if needed during a site update.

---

源代码

File: wp-admin/includes/upgrade.php

function wp_upgrade() {
	global $wp_current_db_version, $wp_db_version, $wpdb;

	$wp_current_db_version = __get_option('db_version');

	// We are up-to-date. Nothing to do.
	if ( $wp_db_version == $wp_current_db_version )
		return;

	if ( ! is_blog_installed() )
		return;

	wp_check_mysql_version();
	wp_cache_flush();
	pre_schema_upgrade();
	make_db_current_silent();
	upgrade_all();
	if ( is_multisite() && is_main_site() )
		upgrade_network();
	wp_cache_flush();

	if ( is_multisite() ) {
		if ( $wpdb->get_row( "SELECT blog_id FROM {$wpdb->blog_versions} WHERE blog_id = '{$wpdb->blogid}'" ) )
			$wpdb->query( "UPDATE {$wpdb->blog_versions} SET db_version = '{$wp_db_version}' WHERE blog_id = '{$wpdb->blogid}'" );
		else
			$wpdb->query( "INSERT INTO {$wpdb->blog_versions} ( `blog_id` , `db_version` , `last_updated` ) VALUES ( '{$wpdb->blogid}', '{$wp_db_version}', NOW());" );
	}

	/**
	 * Fires after a site is fully upgraded.
	 *
	 * @since 3.9.0
	 *
	 * @param int $wp_db_version         The new $wp_db_version.
	 * @param int $wp_current_db_version The old (current) $wp_db_version.
	 */
	do_action( 'wp_upgrade', $wp_db_version, $wp_current_db_version );
}

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更新日志

Version	description
2.1.0	Introduced.

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相关函数

Uses

• wp-admin/includes/upgrade.php: wp_check_mysql_version()
• wp-admin/includes/upgrade.php: pre_schema_upgrade()
• wp-admin/includes/upgrade.php: make_db_current_silent()
• wp-admin/includes/upgrade.php: upgrade_network()
• wp-admin/includes/upgrade.php: wp_upgrade
• wp-includes/cache.php: wp_cache_flush()
• wp-includes/load.php: is_multisite()
• wp-includes/functions.php: is_main_site()
• wp-includes/functions.php: is_blog_installed()
• wp-includes/plugin.php: do_action()
• wp-includes/wp-db.php: wpdb::get_row()
• wp-includes/wp-db.php: wpdb::query()
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User Contributed Notes