Handbuch:page-Tabelle
| ↑ Handbuch:Inhaltsübersicht | MediaWiki-Datenbank-Layout | page-Tabelle |
| MediaWiki Version: | ≥ 1.5 |
Die page-Tabelle kann als der "Kern des Wikis" betrachtet werden. Jede Seite einer MediaWiki-Installation hat hier einen Eintrag, der sie anhand des Titels identifiziert und einige wesentliche Metadaten enthält. Es wurde erstmals in r6710, der MediaWiki-Version 1.5, eingeführt.
Der Text der Seite selbst wird in der text-Tabelle gespeichert. Um den Text eines Artikels abzurufen, sucht MediaWiki zunächst nach page_title in der Seitentabelle. Dann wird page_latest verwendet, um die revision-Tabelle nach rev_id zu durchsuchen, und dabei wird rev_text_id erhalten. Der für rev_text_id erhaltene Wert wird verwendet, um in der Texttabelle nach old_id zu suchen, um den Text abzurufen. Wenn eine Seite gelöscht wird, werden die Revisionen in die archive-Tabelle verschoben.
Felder
page_id
Eindeutige Identifizierung des Primärschlüssels. 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.
For further information, see:
- Help:Page ID - aimed at users.
- Manual:Page ID - aimed at developers.
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_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 Version: | ≥ 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
Unkomprimierte Länge des aktuellen Quelltextes der Seite in Bytes.
Dies gilt jedoch weder für Bilder, die noch Datensätze in dieser Tabelle haben, noch für Vorlagen, die zusätzlichen Text einfügen können.
Stattdessen wird die unkomprimierte Länge in Bytes der description für die Datei verwendet, da letztere im Feld text.old_text steht.
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 Version: | ≥ 1.21 |
Content model, see CONTENT_MODEL_XXX constants. Comparable to revision.rev_content_model.
page_lang
| MediaWiki Version: | ≥ 1.24 |
Sprache des Seiteninhalts. Set to the default value of NULL at the time of page creation.
page_restrictions
| MediaWiki Version: | ≤ 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 Versions: | 1.10 – 1.38 |
page_counter
| MediaWiki Version: | ≤ 1.24 |
Anzahl der Seitenbetrachtungen. Diese Funktion wurde in MediaWiki 1.25 nach einer Aufforderung zur Stellungnahme vollständig entfernt. Schon vorher haben viele Websites, darunter auch Wikimedia-Projekte, es aus Gründen der Leistungssteigerung deaktiviert; für Details siehe Handbuch $wgDisableCounters.
Schematische Übersicht
| MediaWiki Version: | ≥ 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 Version: | 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 Versions: | 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 Version: | 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 Version: | 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 Versions: | 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 Versions: | 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 Versions: | 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 Versions: | 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 | | +-------------------+---------------------+------+-----+---------+----------------+
Indexe
| MediaWiki Version: | ≥ 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.