在wordpress中有效设置多个帖子的类别

Question

I am attempting to migrate large amounts of data from a non-WP-like CMS into WordPress and I'm trying to find an efficient way to assign batches of posts to a category.
wp_set_post_categories() takes a single post and an array of categories to add it to. Is there anything more efficient than simply looping through an array of post id's and calling wp_set_post_categories() on each one with a call to the database each time?

Answer 1

Your best option may be to run a SQL query to set the category on all of the posts in one go.

global $wpdb;
$category = get_category(get_query_var('category'));
$term_taxonomy_id = $category->term_taxonomy_id;
$wpdb->query("
    INSERT INTO $wpdb->term_relationships
    ( object_id, term_taxonomy_id, term_order )
    SELECT
        ID AS object_id,
        $term_taxonomy_id AS term_taxonomy_id,
        0 AS term_order
    FROM
        $wpdb->posts
");

Update: then to update the field that counts the number of posts the category has.

$wpdb->query("
    UPDATE $wpdb->term_taxonomy
    SET `count` = (SELECT COUNT(ID) FROM wp_posts)
    WHERE term_taxonomy_id = $term_taxonomy_id
");