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alvarbasol |
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Ok, enough of trying to find the right queries after the upgrade to 1.5 [[Mediawiki|mediawiki]]. |
Ok, enough of trying to find the right queries after the upgrade to 1.5 [[Mediawiki|mediawiki]]. |
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Revision as of 20:28, 4 October 2007
alvarbasol 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
get page_id
SELECT page_id FROM `page` WHERE page_namespace = '0' AND page_title = 'Ogg' LIMIT 1;
get page_latest
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
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
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
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
select old_id from text where old_text LIKE "%vollmilch%" limit 1;
+--------+ | old_id | +--------+ | 32778 | +--------+
get rev_page from old_id
select rev_page from revision where rev_text_id=32778;
+----------+ | rev_page | +----------+ | 10425 | +----------+
result / page_title
select page_title from page where page_id=10425;
+------------+ | page_title | +------------+ | Sandbox | +------------+
Multiple search results
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
< 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