HandleidingːTabel Page
| ↑ Handleiding:Inhoud | MediaWiki database lay-out | page tabel |
| MediaWiki-versie: | ≥ 1.5 |
De tabel page kan gezien worden als behorend tot de "kern van de wiki". Elke pagina in een MediaWiki installatie heeft hier een record die bepaald wordt op de de titel en die wat essentiële metadata bevat. Het is toegevoegd in r6710, in MediaWiki 1.5.
De tekst van de pagina zelf wordt opgeslagen in de tabel text. Om de tekst van een artikel op te halen, zoekt MediaWiki eerst op page_title in de tabel page. Daarna wordt page_latest gebruikt om in de tabel revision te zoeken naar rev_id, het rev_text_id wordt in dit proces verkregen. De opgehaalde waarde van rev_text_id wordt gebruikt om old_id in de tabel text op te zoeken, dan wordt de tekst opgehaald. Bij het verwijderen van een pagina worden de revisies verplaatst naar de tabel archive.
Fields
page_id
Uniquely identifying primary key. This value is preserved across edits and renames.
Page IDs do not change when pages are moved, but they may change when pages are deleted and then restored. As of MediaWiki 1.27, the historical page ID persists in the archive table, and restored pages attempt to reclaim their old page ID.
MediaWiki offers a number of relevant tools:
- The page ID of any page (except special pages) can be looked up in the "page information" link from the Tools menu.
- The magic word
{{PAGEID}}can be used to return the page id of a page.
- The special page Special:Redirect can be used to access pages via their page IDs.
For example, Special:Redirect/page/1780936, redirects to the present page.
- index.php accepts the parameter
curidto access pages via their page IDs.
For example, /w/index.php?curid=1780936 will load the present page.
There are also many API features that either return the page ID or use it as an input.
For example, for the present page, page_id = 10501, see https://www.mediawiki.org/w/api.php?action=query&prop=info&titles=Manual:Page%20table and https://www.mediawiki.org/w/api.php?action=query&prop=info&pageids=10501.
This field can be accessed by WikiPage::getId(), Title::getArticleID(), etc.
page_namespace
A page name is broken into a namespace and a title. The namespace keys are UI-language-independent constants, defined in includes/Defines.php.
This field contains the number of the page's namespace. The values range from 0 to 99 for the core namespaces, and from 100 to 10,000 for custom namespaces.
page_title
The sanitized page title, without the namespace, with a maximum of 255 characters (binary). It is stored as text, with spaces replaced by underscores. The real title shown in articles is just this title with underscores (_) converted to spaces ( ). For example, a page titled "Talk:Foo Bar" would have "Foo_Bar" in this field.
page_restrictions
| MediaWiki-versie: | ≤ 1.9 |
Comma-separated set of permission keys indicating who can move or edit the page. Edit and move sections are separated by a colon (e.g., "edit=autoconfirmed,sysop:move=sysop").
| MediaWiki-versies: | 1.10 – 1.38 |
page_counter
| MediaWiki-versie: | ≤ 1.24 |
Number of times the page has been viewed. This feature was completely removed in MediaWiki 1.25, following a request for comment. Even before that, many sites including Wikimedia projects disabled it to increase performance; see Manual:$wgDisableCounters for details.
page_is_redirect
A value of 1 here indicates the article is a redirect; it is 0 in all other cases.
page_is_new
This field stores whether the page is new, meaning it either has only one revision or has not been edited since being restored, even if there is more than one revision.
If the field contains a value of 1, then it indicates that the page is new; otherwise, it is 0.
Rollback links are not displayed if the page is new, since there is nothing to roll back to.
page_random
Random decimal value, between 0 and 1, used for Special:Random (see Manual:Random page for more details). Generated by wfRandom().
Around 2005, a bug caused these random values to be non-uniform. Since the field is set at page creation, wikis that have existed for a long time might still have some of these erroneous values. See T208909.
page_touched
This timestamp is updated whenever the page changes in a way requiring it to be re-rendered, invalidating caches. Aside from editing, this includes permission changes, creation or deletion of linked pages, and alteration of contained templates. Set to $dbw->timestamp() at the time of page creation.
page_links_updated
| MediaWiki-versie: | ≥ 1.23 |
This timestamp is updated whenever a page is re-parsed and it has all the link tracking tables updated for it. This is useful for de-duplicating expensive backlink update jobs. Set to the default value of NULL when the page is created by WikiPage::insertOn().
page_latest
This is a foreign key to rev_id for the current revision.
It may be 0 during page creation.
It needs to link to a revision with a valid revision.rev_page, or there will be the "The revision #0 of the page named 'Foo' does not exist" error when one tries to view the page.
Can be obtained via WikiPage::getLatest().
page_len
Uncompressed length in bytes of the page's current source text.
This however, does not apply to images which still have records in this table.
Instead, the uncompressed length in bytes of the description for the file is used as the latter is in the text.old_text field.
The Wikipage class in includes/WikiPage.php has two methods, viz., insertOn() and updateRevisionOn() that are responsible for populating these details.
page_content_model
| MediaWiki-versie: | ≥ 1.21 |
Content model, see CONTENT_MODEL_XXX constants. Comparable to revision.rev_content_model.
page_lang
| MediaWiki-versie: | ≥ 1.24 |
Page content language. Set to the default value of NULL at the time of page creation.
Schema summary
| MediaWiki-versie: | ≥ 1.36 Gerrit change 690067 |
DESCRIBE page;
+--------------------+---------------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +--------------------+---------------------+------+-----+---------+----------------+ | page_id | int(10) unsigned | NO | PRI | NULL | auto_increment | | page_namespace | int(11) | NO | MUL | NULL | | | page_title | varbinary(255) | NO | | NULL | | | page_restrictions | tinyblob | YES | | NULL | | | page_is_redirect | tinyint(3) unsigned | NO | MUL | 0 | | | page_is_new | tinyint(3) unsigned | NO | | 0 | | | page_random | double unsigned | NO | MUL | NULL | | | page_touched | binary(14) | NO | | NULL | | | page_links_updated | varbinary(14) | YES | | NULL | | | page_latest | int(10) unsigned | NO | | NULL | | | page_len | int(10) unsigned | NO | MUL | NULL | | | page_content_model | varbinary(32) | YES | | NULL | | | page_lang | varbinary(35) | YES | | NULL | | +--------------------+---------------------+------+-----+---------+----------------+
| MediaWiki-versie: | 1.35 Gerrit change 581141 |
DESCRIBE page;
+--------------------+---------------------+------+-----+----------------+----------------+ | Field | Type | Null | Key | Default | Extra | +--------------------+---------------------+------+-----+----------------+----------------+ | page_id | int(10) unsigned | NO | PRI | NULL | auto_increment | | page_namespace | int(11) | NO | MUL | NULL | | | page_title | varbinary(255) | NO | | NULL | | | page_restrictions | tinyblob | YES | | NULL | | | page_is_redirect | tinyint(3) unsigned | NO | MUL | 0 | | | page_is_new | tinyint(3) unsigned | NO | | 0 | | | page_random | double unsigned | NO | MUL | NULL | | | page_touched | binary(14) | NO | | | | | page_links_updated | varbinary(14) | YES | | NULL | | | page_latest | int(10) unsigned | NO | | NULL | | | page_len | int(10) unsigned | NO | MUL | NULL | | | page_content_model | varbinary(32) | YES | | NULL | | | page_lang | varbinary(35) | YES | | NULL | | +--------------------+---------------------+------+-----+----------------+----------------+
| MediaWiki-versies: | 1.25 – 1.34 Gerrit change 167655 |
DESCRIBE page;
+--------------------+---------------------+------+-----+----------------+----------------+ | Field | Type | Null | Key | Default | Extra | +--------------------+---------------------+------+-----+----------------+----------------+ | page_id | int(10) unsigned | NO | PRI | NULL | auto_increment | | page_namespace | int(11) | NO | MUL | NULL | | | page_title | varbinary(255) | NO | | NULL | | | page_restrictions | tinyblob | NO | | NULL | | | page_is_redirect | tinyint(3) unsigned | NO | MUL | 0 | | | page_is_new | tinyint(3) unsigned | NO | | 0 | | | page_random | double unsigned | NO | MUL | NULL | | | page_touched | binary(14) | NO | | | | | page_links_updated | varbinary(14) | YES | | NULL | | | page_latest | int(10) unsigned | NO | | NULL | | | page_len | int(10) unsigned | NO | MUL | NULL | | | page_content_model | varbinary(32) | YES | | NULL | | | page_lang | varbinary(35) | YES | | NULL | | +--------------------+---------------------+------+-----+----------------+----------------+
| MediaWiki-versie: | 1.24 Gerrit change 135312 |
DESCRIBE page;
+--------------------+---------------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +--------------------+---------------------+------+-----+---------+----------------+ | page_id | int(10) unsigned | NO | PRI | NULL | AUTO_INCREMENT | | page_namespace | int(11) | NO | MUL | NULL | | | page_title | varchar(255) binary | NO | | NULL | | | page_restrictions | tinyblob | NO | | NULL | | | page_counter | bigint(20) unsigned | NO | | 0 | | | page_is_redirect | tinyint(3) unsigned | NO | MUL | 0 | | | page_is_new | tinyint(3) unsigned | NO | | 0 | | | page_random | real unsigned | NO | MUL | NULL | | | page_touched | binary(14) | NO | | NULL | | | page_links_updated | varbinary(14) | YES | | NULL | | | page_latest | int(10) unsigned | NO | | NULL | | | page_len | int(10) unsigned | NO | MUL | NULL | | | page_content_model | varbinary(32) | YES | | NULL | | | page_lang | varbinary(35) | YES | | NULL | | +--------------------+---------------------+------+-----+---------+----------------+
| MediaWiki-versie: | 1.23 Gerrit change 101170 |
DESCRIBE page;
+--------------------+---------------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +--------------------+---------------------+------+-----+---------+----------------+ | page_id | int(10) unsigned | NO | PRI | NULL | AUTO_INCREMENT | | page_namespace | int(11) | NO | MUL | NULL | | | page_title | varchar(255) binary | NO | | NULL | | | page_restrictions | tinyblob | NO | | NULL | | | page_counter | bigint(20) unsigned | NO | | 0 | | | page_is_redirect | tinyint(3) unsigned | NO | MUL | 0 | | | page_is_new | tinyint(3) unsigned | NO | | 0 | | | page_random | real unsigned | NO | MUL | NULL | | | page_touched | binary(14) | NO | | NULL | | | page_links_updated | varbinary(14) | YES | | NULL | | | page_latest | int(10) unsigned | NO | | NULL | | | page_len | int(10) unsigned | NO | MUL | NULL | | | page_content_model | varbinary(32) | YES | | NULL | | +--------------------+---------------------+------+-----+---------+----------------+
| MediaWiki-versies: | 1.21 – 1.22 |
DESCRIBE page;
+--------------------+---------------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +--------------------+---------------------+------+-----+---------+----------------+ | page_id | int(10) unsigned | NO | PRI | NULL | AUTO_INCREMENT | | page_namespace | int(11) | NO | MUL | NULL | | | page_title | varchar(255) binary | NO | | NULL | | | page_restrictions | tinyblob | NO | | NULL | | | page_counter | bigint(20) unsigned | NO | | 0 | | | page_is_redirect | tinyint(3) unsigned | NO | MUL | 0 | | | page_is_new | tinyint(3) unsigned | NO | | 0 | | | page_random | real unsigned | NO | MUL | NULL | | | page_touched | binary(14) | NO | | NULL | | | page_latest | int(10) unsigned | NO | | NULL | | | page_len | int(10) unsigned | NO | MUL | NULL | | | page_content_model | varbinary(32) | YES | | NULL | | +--------------------+---------------------+------+-----+---------+----------------+
| MediaWiki-versies: | 1.19 – 1.20 |
DESCRIBE page;
+-------------------+---------------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-------------------+---------------------+------+-----+---------+----------------+ | page_id | int(10) unsigned | NO | PRI | NULL | AUTO_INCREMENT | | page_namespace | int(11) | NO | MUL | NULL | | | page_title | varchar(255) binary | NO | | NULL | | | page_restrictions | tinyblob | NO | | NULL | | | page_counter | bigint(20) unsigned | NO | | 0 | | | page_is_redirect | tinyint(3) unsigned | NO | MUL | 0 | | | page_is_new | tinyint(3) unsigned | NO | | 0 | | | page_random | real unsigned | NO | MUL | NULL | | | page_touched | binary(14) | NO | | NULL | | | page_latest | int(10) unsigned | NO | | NULL | | | page_len | int(10) unsigned | NO | MUL | NULL | | +-------------------+---------------------+------+-----+---------+----------------+
| MediaWiki-versies: | 1.10 – 1.18 |
DESCRIBE page;
+-------------------+---------------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-------------------+---------------------+------+-----+---------+----------------+ | page_id | int(10) unsigned | NO | PRI | NULL | AUTO_INCREMENT | | page_namespace | int(11) | NO | MUL | NULL | | | page_title | varchar(255) binary | NO | | NULL | | | page_restrictions | tinyblob | NO | | NULL | | | page_counter | bigint(20) unsigned | NO | | 0 | | | page_is_redirect | tinyint(3) unsigned | NO | | 0 | | | page_is_new | tinyint(3) unsigned | NO | | 0 | | | page_random | real unsigned | NO | MUL | NULL | | | page_touched | binary(14) | NO | | NULL | | | page_latest | int(10) unsigned | NO | | NULL | | | page_len | int(10) unsigned | NO | MUL | NULL | | +-------------------+---------------------+------+-----+---------+----------------+
| MediaWiki-versies: | 1.5 – 1.9 |
DESCRIBE page;
+-------------------+---------------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-------------------+---------------------+------+-----+---------+----------------+ | page_id | int(8) unsigned | NO | PRI | NULL | AUTO_INCREMENT | | page_namespace | int(11) | NO | MUL | NULL | | | page_title | varchar(255) binary | NO | | NULL | | | page_restrictions | tinyblob | NO | | NULL | | | page_counter | bigint(20) unsigned | NO | | 0 | | | page_is_redirect | tinyint(1) unsigned | NO | | 0 | | | page_is_new | tinyint(1) unsigned | NO | | 0 | | | page_random | real unsigned | NO | MUL | NULL | | | page_touched | char(14) binary | NO | | NULL | | | page_latest | int(8) unsigned | NO | | NULL | | | page_len | int(8) unsigned | NO | MUL | NULL | | +-------------------+---------------------+------+-----+---------+----------------+
Indexes
| MediaWiki-versie: | ≥ 1.28 |
SHOW INDEX IN page;
+-------+------------+-----------------------------+--------------+------------------+-----------+-------------+----------+--------+------+------------+---------+---------------+ | Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment | +-------+------------+-----------------------------+--------------+------------------+-----------+-------------+----------+--------+------+------------+---------+---------------+ | page | 0 | PRIMARY | 1 | page_id | A | 0 | NULL | NULL | | BTREE | | | | page | 0 | page_name_title | 1 | page_namespace | A | 0 | NULL | NULL | | BTREE | | | | page | 0 | page_name_title | 2 | page_title | A | 0 | NULL | NULL | | BTREE | | | | page | 1 | page_random | 1 | page_random | A | 0 | NULL | NULL | | BTREE | | | | page | 1 | page_len | 1 | page_len | A | 0 | NULL | NULL | | BTREE | | | | page | 1 | page_redirect_namespace_len | 1 | page_is_redirect | A | 0 | NULL | NULL | | BTREE | | | | page | 1 | page_redirect_namespace_len | 2 | page_namespace | A | 0 | NULL | NULL | | BTREE | | | | page | 1 | page_redirect_namespace_len | 3 | page_len | A | 0 | NULL | NULL | | BTREE | | | +-------+------------+-----------------------------+--------------+------------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
Sample MySQL code
Listing pages and relations with other essential tables
The following code will select the most recent versions of all articles assuming that compression or external storage is not in use:
SELECT page_id, page_namespace, page_title, page_latest "rev_id", old_text "text"
FROM page
INNER JOIN slots on page_latest = slot_revision_id
INNER JOIN slot_roles on slot_role_id = role_id and role_name = 'main'
INNER JOIN content on slot_content_id = content_id inner join text on substring( content_address, 4 ) = old_id and left( content_address, 3 ) = "tt:" and old_flags = "utf-8";
Other important considerations:
- to find pages in namespace 0 add
p.page_namespace = 0 - to find pages that are not redirects add
p.page_is_redirect = 0
These additional statements can be added either as conditions to a Where statement or as conditions on the appropriate INNER JOIN statement.