maybe_disable_link_manager()

Disables the Link Manager on upgrade if, at the time of upgrade, no links exist in the DB.

Source

File: wp-admin/includes/upgrade.php 

function maybe_disable_link_manager() {
	global $wp_current_db_version, $wpdb;

	if ( $wp_current_db_version >= 22006 && get_option( 'link_manager_enabled' ) && ! $wpdb->get_var( "SELECT link_id FROM $wpdb->links LIMIT 1" ) )
		update_option( 'link_manager_enabled', 0 );
}

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Related

Uses

Uses
Uses Description
wp-includes/wp-db.php: wpdb::get_var()

Retrieve one variable from the database.
wp-includes/option.php: update_option()

Update the value of an option that was already added.
wp-includes/option.php: get_option()

Retrieves an option value based on an option name.

Changelog

Changelog
Version Description
WP-3.5.0 Introduced.