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    Sun, 07 Feb 2016


    /SW/business/WordPress: Drupal 6 to WordPress 4 Migration

    With many thanks to this[1] post for doing most of the work. Note that I have a simpler situation with only one user and no URL aliases.

    Prepare your freshly install WordPress 4.4 database by truncating default posts / pages / comments after installation.

    TRUNCATE TABLE wordpress.wp_comments;
    TRUNCATE TABLE wordpress.wp_links;
    TRUNCATE TABLE wordpress.wp_postmeta;
    TRUNCATE TABLE wordpress.wp_posts;
    TRUNCATE TABLE wordpress.wp_term_relationships;
    TRUNCATE TABLE wordpress.wp_term_taxonomy;
    TRUNCATE TABLE wordpress.wp_terms;

    Migrate tags:

    INSERT INTO wordpress.wp_terms (term_id, name, slug, term_group) SELECT d.tid, d.name, REPLACE(LOWER(d.name), ' ', '-'), 0 FROM drupal.term_data d INNER JOIN drupal.term_hierarchy h USING(tid);
    INSERT INTO wordpress.wp_term_taxonomy (term_id, taxonomy, description, parent) SELECT d.tid `term_id`, 'category' `taxonomy`, d.description `description`, h.parent `parent` FROM drupal.term_data d INNER JOIN drupal.term_hierarchy h USING(tid);

    Copy over Drupal posts to your WordPress database.

    INSERT INTO wordpress.wp_posts (id, post_author, post_date, post_content, post_title, post_excerpt, post_modified, post_type, post_status, to_ping, pinged, post_content_filtered) SELECT DISTINCT n.nid `id`, n.uid `post_author`, FROM_UNIXTIME(n.created) `post_date`, r.body `post_content`, n.title `post_title`, r.teaser `post_excerpt`, FROM_UNIXTIME(n.changed) `post_modified`, n.type `post_type`, IF(n.status = 1, 'publish', 'private') `post_status`, '', '', '' FROM drupal.node n, drupal.node_revisions r WHERE n.vid = r.vid;
    UPDATE wordpress.wp_posts SET post_type = 'post' WHERE post_type <> 'page' OR post_type <> 'post';

    Update post to tag / category relationship:

    INSERT INTO wordpress.wp_term_relationships (object_id, term_taxonomy_id) SELECT nid, tid FROM drupal.term_node;

    Update tags / category post count:

    UPDATE wordpress.wp_term_taxonomy tt SET `count` = (SELECT COUNT(tr.object_id) FROM wordpress.wp_term_relationships tr WHERE tr.term_taxonomy_id = tt.term_taxonomy_id);

    The following code is supposed to help fix taxonomy:

    UPDATE IGNORE wordpress.wp_term_relationships, wordpress.wp_term_taxonomy SET wordpress.wp_term_relationships.term_taxonomy_id = wordpress.wp_term_taxonomy.term_taxonomy_id WHERE wordpress.wp_term_relationships.term_taxonomy_id = wordpress.wp_term_taxonomy.term_id;

    Insert comments to posts:

    INSERT INTO wordpress.wp_comments (comment_post_ID, comment_date, comment_content, comment_parent, comment_author, comment_author_email, comment_author_url, comment_approved) SELECT DISTINCT nid, FROM_UNIXTIME(timestamp), comment, thread, name, mail, homepage, ((status + 1) % 2) FROM drupal.comments;

    Update post comments count:

    UPDATE wordpress.wp_posts SET `comment_count` = (SELECT COUNT(`comment_post_id`) FROM wordpress.wp_comments WHERE wordpress.wp_posts.`id` = wordpress.wp_comments.`comment_post_id`);

    You can avoid this step if you omit copying the teaser / post_excerpt post field. Or, after the fact:

    UPDATE wp_posts SET post_excerpt = NULL WHERE post_excerpt is not null;

    My tag category links did not display out of the box, and this fixed that:

    In backend --> Settings --> Permalinks set a custom value ("topics" for instance) for category base.

    And finally, the comments that I imported are not displaying properly yet. At this point I do not care enough to try to fix it, so caveat emptor.

    [1] http://www.jamediasolutions.com/blog/migrating-drupal-to-wordpress.html

    posted at: 03:49 | path: /SW/business/WordPress | permanent link to this entry