How to insert data in wordpress database table with functions.php?

How to insert data in wordpress database table with functions.php?

	global $wpdb;
	$quotetable = $wpdb->prefix . "quote";		
	$wpdb->insert( $quotetable,
		array(
		'useremail' => $useremail,
		'quote_no' => "123",
		'product_ids' => "1,2,3"
		)
	);