wp_get_db_schema() – Retrieve the SQL for creating database tables.

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Description

Retrieve the SQL for creating database tables.

Usage

$string = wp_get_db_schema( $scope, $blog_id );

Parameters

$scope
( string ) optional default: all – Optional. The tables for which to retrieve SQL. Can be all, global, ms_global, or blog tables. Defaults to all.
$blog_id
( int ) optional – Optional. The site ID for which to retrieve SQL. Default is the current site ID.

Returns

string The SQL needed to create the requested tables.

Source

File name: wordpress/wp-admin/includes/schema.php
Lines:

1 to 100 of 309
function wp_get_db_schema( $scope = 'all', $blog_id = null ) {
  global $wpdb;

  $charset_collate = $wpdb->get_charset_collate();

  if ( $blog_id && $blog_id != $wpdb->blogid ) {
    $old_blog_id = $wpdb->set_blog_id( $blog_id );
  }

  // 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 $wpdb->termmeta (
	meta_id bigint(20) unsigned NOT NULL auto_increment,
	term_id bigint(20) unsigned NOT NULL default '0',
	meta_key varchar(255) default NULL,
	meta_value longtext,
	PRIMARY KEY  (meta_id),
	KEY term_id (term_id),
	KEY meta_key (meta_key($max_index_length))
) $charset_collate;
CREATE TABLE $wpdb->terms (
 term_id bigint(20) unsigned NOT NULL auto_increment,
 name varchar(200) NOT NULL default '',
 slug varchar(200) NOT NULL default '',
 term_group bigint(10) NOT NULL default 0,
 PRIMARY KEY  (term_id),
 KEY slug (slug($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,
 term_id bigint(20) unsigned NOT NULL default 0,
 taxonomy varchar(32) NOT NULL default '',
 description longtext NOT NULL,
 parent bigint(20) unsigned NOT NULL default 0,
 count bigint(20) NOT NULL default 0,
 PRIMARY KEY  (term_taxonomy_id),
 UNIQUE KEY term_id_taxonomy (term_id,taxonomy),
 KEY taxonomy (taxonomy)
) $charset_collate;
CREATE TABLE $wpdb->term_relationships (
 object_id bigint(20) unsigned NOT NULL default 0,
 term_taxonomy_id bigint(20) unsigned NOT NULL default 0,
 term_order int(11) NOT NULL default 0,
 PRIMARY KEY  (object_id,term_taxonomy_id),
 KEY term_taxonomy_id (term_taxonomy_id)
) $charset_collate;
CREATE TABLE $wpdb->commentmeta (
	meta_id bigint(20) unsigned NOT NULL auto_increment,
	comment_id bigint(20) unsigned NOT NULL default '0',
	meta_key varchar(255) default NULL,
	meta_value longtext,
	PRIMARY KEY  (meta_id),
	KEY comment_id (comment_id),
	KEY meta_key (meta_key($max_index_length))
) $charset_collate;
CREATE TABLE $wpdb->comments (
	comment_ID bigint(20) unsigned NOT NULL auto_increment,
	comment_post_ID bigint(20) unsigned NOT NULL default '0',
	comment_author tinytext NOT NULL,
	comment_author_email varchar(100) NOT NULL default '',
	comment_author_url varchar(200) NOT NULL default '',
	comment_author_IP varchar(100) NOT NULL default '',
	comment_date datetime NOT NULL default '0000-00-00 00:00:00',
	comment_date_gmt datetime NOT NULL default '0000-00-00 00:00:00',
	comment_content text NOT NULL,
	comment_karma int(11) NOT NULL default '0',
	comment_approved varchar(20) NOT NULL default '1',
	comment_agent varchar(255) NOT NULL default '',
	comment_type varchar(20) NOT NULL default 'comment',
	comment_parent bigint(20) unsigned NOT NULL default '0',
	user_id bigint(20) unsigned NOT NULL default '0',
	PRIMARY KEY  (comment_ID),
	KEY comment_post_ID (comment_post_ID),
	KEY comment_approved_date_gmt (comment_approved,comment_date_gmt),
	KEY comment_date_gmt (comment_date_gmt),
	KEY comment_parent (comment_parent),
	KEY comment_author_email (comment_author_email(10))
) $charset_collate;
CREATE TABLE $wpdb->links (
	link_id bigint(20) unsigned NOT NULL auto_increment,
	link_url varchar(255) NOT NULL default '',
	link_name varchar(255) NOT NULL default '',
	link_image varchar(255) NOT NULL default '',
	link_target varchar(25) NOT NULL default '',
	link_description varchar(255) NOT NULL default '',
	link_visible varchar(20) NOT NULL default 'Y',
	link_owner bigint(20) unsigned NOT NULL default '1',
	link_rating int(11) NOT NULL default '0',
	link_updated datetime NOT NULL default '0000-00-00 00:00:00',
	link_rel varchar(255) NOT NULL default '',
 

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