Manual:Page table/ja

page テーブルは「ウィキの中核」とみなすことができます. このテーブルには、ある一つのMediaWiki内にある各ページに対応したエントリーがあります. エントリーはタイトルによって識別され、そのほかにもいくつかの不可欠なメタデータも含まれています. それは MediaWiki 1.5 のリビジョン r6710 で初めて導入されました.

ページの内容そのものは テーブルに保存されます. 記事の内容を取り出す際、MediaWikiはpageテーブルの page_title をまず検索します. そして テーブルの  から page_latest と一致する値を検索し、 を得ます. 得られた を text テーブルの  から検索し、ページ内容を取り出します. ページが削除されると、各リビジョンは テーブルに移動されます.

page_id
一意に識別される主キーです. この値はページの編集や移動を行っても保持されます.

ページIDはページを移動しても変わりませんが、ページを削除しその後復元したときは変わるかもしれません. MediaWiki 1.27以降、削除前のページIDはarchiveテーブルに保持され、復元されたページは以前のページIDを再利用しようとします.

MediaWikiはさまざまな関連ツールを提供しています：


 * （特別ページを除く）あらゆるページのページIDは、ツールメニューの"ページ情報"で確認できます.
 * の呪文を記すとそのページのページIDに変換されます.
 * Special:Redirectの特別ページからページIDを使ってページにアクセスすることができます. 例えば、Special:Redirect/page/ にアクセスすると現在のページにリダイレクトされます.
 * index.php で  パラメータにページIDを指定しそのページにアクセスすることができます.  例えば、[///w/index.php?curid= /w/index.php?curid=] にアクセスすれば現在のページが表示されます.

この他にもページIDを返す、またはページIDを入力として用いるさまざまなAPIがあります. 例えば、 であるこのページに関するページ https://www.mediawiki.org/w/api.php?action=query&prop=info&titles=Manual:Page%20table と https://www.mediawiki.org/w/api.php?action=query&prop=info&pageids=10501 を見てみてください. このフィールドは 、 などを使ってアクセスできます.

page_namespace
ページ名は名前空間とタイトルに分けられます. 名前空間のキーはユーザインタフェース言語ごとに独立した定数で、により定義されています.

このフィールドにはページの名前空間の番号が書かれています. 値の範囲は、中心となる名前空間の場合0から99、カスタム名前空間の場合100から10,000です.

page_title
不正な文字を取り除いたページタイトルで名前空間は含みません. 最大255文字（バイナリ）です. 文字列として保存され、空白はアンダースコアに置換されます. 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
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").

page_counter
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 for details.

page_is_redirect
A value of   here indicates the article is a redirect; it is   in all other cases.

page_is_new
This field stores whether the page is a 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  , then it indicates that the page is a new; otherwise, it is  . 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 for more details). によって生成されます.

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 at the time of page creation.

page_links_updated
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, 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.

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  for the file is used as the latter is in the   field.

The  class in   has two methods, viz.,   and   that are responsible for populating these details.

page_content_model
Content model, see CONTENT_MODEL_XXX constants. Comparable to.

page_lang
ページ本文の言語です. Set to the default value of NULL at the time of page creation.

スキーマの要約
++-+--+-+++ ++-+--+-+++ ++-+--+-+++
 * 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           |                |

++-+--+-+++ ++-+--+-+++ ++-+--+-+++
 * 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           |                |

++-+--+-+-++ ++-+--+-+-++ ++-+--+-+-++
 * 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    |                |

++-+--+-+-++ ++-+--+-+-++ ++-+--+-+-++
 * 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    |                |

++-+--+-+-++ ++-+--+-+-++ ++-+--+-+-++
 * 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    |                |

+---+-+--+-+-++ +---+-+--+-+-++ +---+-+--+-+-++
 * 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    |                |

+---+-+--+-+-++ +---+-+--+-+-++ +---+-+--+-+-++
 * 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    |                |

+---+-+--+-+-++ +---+-+--+-+-++ +---+-+--+-+-++
 * 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    |                |

インデックス
 +---++-+--+--+---+-+--++--++-+---+ +---++-+--+--+---+-+--++--++-+---+ +---++-+--+--+---+-+--++--++-+---+
 * 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 | name_title                  |            1 | page_namespace   | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |
 * page |          0 | 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      |         |               |

一覧ページとその他の必須テーブルとの関係
以下のコードにより、中心となるテーブル（page, revision, text）から全記事の最新版を選択できます.

Other important considerations:


 * to find undeleted pages add
 * to find pages in namespace 0 add
 * to find pages that are not redirects add

These additional statements can be added either as conditions to a Where statement or as conditions on the appropriate Inner Join statement.

Deleting pages with their relationships in text and revision tables
The following shows the steps to run to help you delete pages and their children from the main pages in the page, revision and text tables.

Listing all related table keys

Deleting from database the rows

以下のような結果が得られるでしょう.

 +--+--+--+ +--+--+--+ +--+--+--+ 1 row in set (0.07 sec)
 * page                                            | revision                                         | text                                             |
 * IN(5530,5528,5529,5530,5529,5528,5532,5532,5532) | IN(9918,9921,9917,9919,9920,9916,9922,9915,9923) | IN(9918,9921,9917,9919,9920,9916,9922,9915,9923) |

以下ののクエリで結合したidを置き換えてください.

この後、この管理スクリプトを使って掃除のようなことができます.