×
Create a new article
Write your page title here:
We currently have 3,189 articles on s23. Type your article name above or create one of the articles listed here!



    s23
    3,189Articles

    MediaWiki/reverse engineering

    Ok, enough of trying to find the right queries after the upgrade to 1.5 MediaWiki.

    Lets just log the sql queries from the server.

    A page being requested[edit]

    get page_id[edit]

    SELECT page_id FROM `page` WHERE page_namespace = '0' AND page_title = 'Ogg' LIMIT 1;

    get page_latest[edit]

    SELECT page_id,page_namespace,page_title,page_restrictions,page_counter,page_is_redirect,page_is_new,page_random,page_touched,page_latest,page_len FROM `page` WHERE page_id = '17369' LIMIT 1;

    after having page_latest (32808) ,which is = rev_id in revision we can:

    get revision_text_id[edit]

    SELECT rev_text_id from revision where rev_id=32808;

    after having rev_text_id (32770), which is = old_id, we can finally:

    get the actual content[edit]

    SELECT old_text,old_flags FROM `text` WHERE old_id = '32770';

    brion: old_id=rev_text_id
    brion: rev_id=page_latest
    brion: rev_page=page_id
    

    Searching for content[edit]

    To seach for content in pages and return page titles that match, we would have to revert the process:

    get old_id of matching page[edit]

    select old_id from text where old_text LIKE "%vollmilch%" limit 1;
    
    +--------+
    | old_id |
    +--------+
    |  32778 |
    +--------+
    

    get rev_page from old_id[edit]

    select rev_page from revision where rev_text_id=32778;
    
    +----------+
    | rev_page |
    +----------+
    |    10425 |
    +----------+
    

    result / page_title[edit]

    select page_title from page where page_id=10425;
    
    +------------+
    | page_title |
    +------------+
    | Sandbox    |
    +------------+
    

    Multiple search results[edit]

    select old_id from text where old_text LIKE "%finn%" LIMIT 5;

    +--------+
    | old_id |
    +--------+
    |  19561 |
    |  12621 |
    |  12622 |
    |  12682 |
    |  12683 |
    +--------+
    

    select distinct rev_page from revision where rev_text_id IN (19561,12621,12622,12682,12683);

    +----------+
    | rev_page |
    +----------+
    |     9559 |
    |     9609 |
    |    13622 |
    +----------+
    

    select page_title from page where page_id IN (9559,9609,13622);

    +----------------+
    | page_title     |
    +----------------+
    | Debian/Posters |
    | Donations      |
    | Forum          |
    +----------------+
    

    ...OR, one could as well just use the searchindex table:

    select si_page,si_title from searchindex where si_text LIKE "%Vorbis%";

    +---------+-----------+
    | si_page | si_title  |
    +---------+-----------+
    |    9746 | gnump3d   |
    |   17369 | ogg       |
    |   17368 | zinf      |
    |   17367 | icecast   |
    |   15735 | converter |
    +---------+-----------+
    

    but we want the nice page titles, not this lowercase version, so we join the table with page, since si_page = page_id


    select page_title from searchindex join page on page_id=si_page where si_text LIKE "%Vorbis%";

    +------------+
    | page_title |
    +------------+
    | Converter  |
    | GnuMp3d    |
    | Icecast    |
    | Ogg        |
    | Zinf       |
    +------------+
    

    dddooh, so much easier. ;)

    ok, got it[edit]

    < mutante> ok,with newer pages i can use rev_id=page_latest and old_id=rev_text_id, but with older pages i have equal values in rev_id and rev_text_id and i get an empty set if i then try to select page_title from page where page_latest=

    <brion> mutante: rev_page=page_id

    < brion> page_latest points to the latest rev_id in the page for convenience

    Cookies help us deliver our services. By using our services, you agree to our use of cookies.
    Cookies help us deliver our services. By using our services, you agree to our use of cookies.