手册:revision表

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This page is a translated version of the page Manual:Revision table and the translation is 5% complete.
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手册:目录 MediaWiki数据库布局 revision table/zh


MediaWiki版本: 1.5

The revision table holds metadata for every edit done to a page within the wiki. Every edit of a page creates a revision row, which holds information such as the user who made the edit, the time at which the edit was made, and a reference to the new wikitext in the text table.

Note that a row is partly about the edit operation and partly about the result of that operation, the new wikitext. It does not give a direct reference to the old wikitext.

Import of the last revision of a page from another wiki produces two entries in the revision table, one with the date and wikitext of the imported revision, and one with the import date. The wikitext of the latter, which becomes that of the current page, is, if a page with the same name already existed, that of the more recent of the two pages.

The revision table is very similar to the recentchanges table. The revision table is used for page history and user contributions listings. The recentchanges table is used for recent changes , related changes , watchlists , and, in the case of page creation, for the list of new pages .

Differences include:

  • The recentchanges table also records logged events such as page moves and deletions
  • Items in the recentchanges table are periodically purged; those in the revision table are retained permanently, unless the page is deleted or the site owner runs the deleteOldRevisions.php maintenance script.
  • as said, import of a page revision not only adds an entry to the revision table with the import date, but also one with the original date.

Deleted revisions are moved to the archive table.

The revision table and the text table were introduced in MediaWiki 1.5 to supersede the cur table.

欄位

rev_id

MediaWiki版本: 1.5

此欄位保存每個版本的主鍵。 page_latest 是指向此欄位的外鍵。 The rev_id numbers have been preserved across deletion/undeletion since the table's inception in MediaWiki 1.5, when rev_id and text_id superseded the old cur_id.

rev_page

MediaWiki版本: 1.5

This field holds a reference to the page to which this revision pertains. The number in this field is equal to the page_id field of said page. This should never be invalid; if it is, that revision won't show up in the page history. If page.page_latest links to a revision with an invalid rev_page, this will cause the "The revision #0 of the page named 'Foo' does not exist" error. (similar issue might occur when slots and content are missing for the revision)

rev_text_id

MediaWiki版本: 1.5

This is a foreign key to old_id in the text table. (The text table is where the actual bulk text is stored.) It's possible for multiple revisions to use the same text - for instance, revisions where only metadata is altered, or where a rollback is done to a previous version.

(在1.31版本中已弃用) If rows in the slots table with slots.slot_revision_id = rev_id exist, this field should be ignored (and may be 0) in favor of the corresponding data from the slots and content tables.

rev_comment

MediaWiki版本: 1.5

This field holds an editor's edit summary (editor's comment on revision). This text is shown in the history and contributions. (The recentchanges table contains a copy used for recent changes , related changes , watchlists , and, in the case of page creation, for the list of new pages .) It is rendered in a sanitized subset of wiki markup.

(已弃用) revcomment_comment_id of the revision_comment_temp table and the comment table should be used instead!

rev_comment_id

MediaWiki版本: 1.31

This field holds a reference to the comment row containing the editor's comment.

rev_user

MediaWiki版本: 1.5

This is equal to the user_id of the user who made this edit. The value for this field is 0 for anonymous edits, initializations scripts, and for some mass imports.

Note, there are bugs: T112384.

(在1.31版本中已弃用) While actor migration is being done, and depending on the configuration setting $wgActorTableSchemaMigrationStage, this field may be empty and the actor performing the edit can be stored in the rev_actor field or the revision_actor_temp table instead.

rev_user_text

MediaWiki版本: 1.5

This field holds the text of the editor's username , or the IP address of the editor if the revision was done by an unregistered user.

In anonymous revisions imported from UseModWiki or early incarnations of the Phase II software, this field may contain an IP address with the final octet obscured (i.e. \d{1,3}\.\d{1,3}\.\d{1,3}\.xxx such as 24.150.61.xxx; see bug 3631). Some edits imported from UseModWiki may contain a Reverse DNS lookup hostname like ppfree165-153-bz.aknet.it or office.bomis.com.

(在1.31版本中已弃用) While actor migration is being done, and depending on the configuration setting $wgActorTableSchemaMigrationStage, this field may be empty and the actor performing the edit can be stored in the rev_actor field or the revision_actor_temp table instead.

rev_timestamp

MediaWiki版本: 1.5

Holds the timestamp of the edit.

rev_minor_edit

MediaWiki版本: 1.5

Records whether the user marked the 'minor edit' checkbox. If the value for this field is 1, then the edit was declared as 'minor'; it is 0 otherwise. Many automated edits are marked as minor.

rev_deleted

MediaWiki版本: 1.5

This field is reserved for 手册:修订版本删除 system. It's a bitfield in which the values are DELETED_TEXT = 1; DELETED_COMMENT = 2; DELETED_USER = 4; and DELETED_RESTRICTED = 8. So, for example, if nothing has been deleted from that revision, then the value is 0; if both the comment and user have been deleted, then the value is 6.

rev_len

MediaWiki版本: 1.10

This field contains the length of the article after the revision, in bytes. Used in history pages. Corresponds to rc_new_len .

rev_parent_id

MediaWiki版本: 1.10

The rev_id of the previous revision to the page. Corresponds to rc_last_oldid . For edits which are new page creations, rev_parent_id = 0.

Usage

This field is used to add support for a tree structure. This field is e.g. used to calculate the size difference of a certain revision with the previous revision in the page history view. If a parent ID points to a revision that's associated with a different page, MediaWiki will still use that parent revision as a basis of comparison for purposes of calculating size difference. If a revision is deleted from the database, and another revision's parent ID still points to it, then MediaWiki will behave the same as if there were no parent revision; i.e. it will assume the previous size was 0.

Transferred revisions

When revisions are imported from another wiki, the imported revisions' parent ID tree structure from the source wiki is retained (this is implemented by each revision's, other than the tail revision, having a <parentid> XML element that is used to populate rev_parent_id), and the destination wiki's revisions' parent IDs are not updated. Likewise, when page histories are merged, the parent IDs of the revisions from the source and destination pages are not updated. populateParentId.php can be used to populate rev_parent_id based on revision timestamps and revision IDs. In the case of an edit conflict, the revision ID of the edit that is saved first (causing the conflict) will be used as the parent ID of the edit that is saved second (after resolving the conflict).

rev_sha1

MediaWiki版本: 1.19

This field is used to add the SHA-1 text content hash in base-36 (generated by Wikimedia\base_convert().) Since 1.32, it's a nested hash of hashes of content_sha1 across all slots of the revision. If the revision only has one slot, the values of the rev_sha1 and content_sha1 fields are identical. The nested hash algorithm is implemented in RevisionSlots::computeSha1(). It can be outlined as:

 rev_sha1 = hash_n;
 hash_n = sha1( hash_n-1, content_sha1_n );
 hash_1 = content_sha1_1;

rev_content_model

MediaWiki版本: 1.21

Content model, see CONTENT_MODEL_XXX constants in Defines.php . These IDs will be exposed in the API and XML dumps. Extensions that define their own content model IDs should take care to avoid conflicts. Using the extension name as a prefix is recommended, for example 'myextension-somecontent'. Possible values are, e.g.: 'wikitext', 'javascript', 'css', 'text', and 'json'

(在1.31版本中已弃用) If rows in the slots table with slot_revision_id = rev_id this field should be ignored (and may be NULL) in favor of the corresponding data from the slots and content tables.

rev_content_format

MediaWiki版本: 1.21

Content format, see CONTENT_FORMAT_XXX constants in Defines.php . These should be MIME types, and will be exposed in the API and XML dumps. Extensions are free to use the below formats, or define their own. It is recommended to stick with the conventions for MIME types. Possible values are, e.g.: 'text/x-wiki', 'text/javascript', 'text/css', 'text/plain', 'text/html', 'application/vnd.php.serialized', 'application/json', 'application/xml'

(在1.31版本中已弃用) If rows in the slots table with slot_revision_id = rev_id exist, this field should be ignored (and may be NULL).

Schema summary

MediaWiki版本: 1.31

DESCRIBE revision;

+--------------------+---------------------+------+-----+----------------+----------------+
| Field              | Type                | Null | Key | Default        | Extra          |
+--------------------+---------------------+------+-----+----------------+----------------+
| rev_id             | int(10) unsigned    | NO   | PRI | NULL           | auto_increment |
| rev_page           | int(10) unsigned    | NO   | MUL | NULL           |                |
| rev_text_id        | int(10) unsigned    | NO   |     | 0              |                |
| rev_comment        | varbinary(767)      | NO   |     |                |                |
| rev_user           | int(10) unsigned    | NO   | MUL | 0              |                |
| rev_user_text      | varbinary(255)      | NO   | MUL |                |                |
| rev_timestamp      | binary(14)          | NO   | MUL |                |                |
| rev_minor_edit     | tinyint(3) unsigned | NO   |     | 0              |                |
| rev_deleted        | tinyint(3) unsigned | NO   |     | 0              |                |
| rev_len            | int(10) unsigned    | YES  |     | NULL           |                |
| rev_parent_id      | int(10) unsigned    | YES  |     | NULL           |                |
| rev_sha1           | varbinary(32)       | NO   |     |                |                |
| rev_content_model  | varbinary(32)       | YES  |     | NULL           |                |
| rev_content_format | varbinary(64)       | YES  |     | NULL           |                |
+--------------------+---------------------+------+-----+----------------+----------------+
MediaWiki版本: 1.30

DESCRIBE revision;

+--------------------+---------------------+------+-----+----------------+----------------+
| Field              | Type                | Null | Key | Default        | Extra          |
+--------------------+---------------------+------+-----+----------------+----------------+
| rev_id             | int(10) unsigned    | NO   | PRI | NULL           | auto_increment |
| rev_page           | int(10) unsigned    | NO   | MUL | NULL           |                |
| rev_text_id        | int(10) unsigned    | NO   |     | NULL           |                |
| rev_comment        | varbinary(767)      | NO   |     |                |                |
| rev_user           | int(10) unsigned    | NO   | MUL | 0              |                |
| rev_user_text      | varbinary(255)      | NO   | MUL |                |                |
| rev_timestamp      | binary(14)          | NO   | MUL |                |                |
| rev_minor_edit     | tinyint(3) unsigned | NO   |     | 0              |                |
| rev_deleted        | tinyint(3) unsigned | NO   |     | 0              |                |
| rev_len            | int(10) unsigned    | YES  |     | NULL           |                |
| rev_parent_id      | int(10) unsigned    | YES  |     | NULL           |                |
| rev_sha1           | varbinary(32)       | NO   |     |                |                |
| rev_content_model  | varbinary(32)       | YES  |     | NULL           |                |
| rev_content_format | varbinary(64)       | YES  |     | NULL           |                |
+--------------------+---------------------+------+-----+----------------+----------------+
MediaWiki版本: 1.25 – 1.29

DESCRIBE revision;

+--------------------+---------------------+------+-----+----------------+----------------+
| Field              | Type                | Null | Key | Default        | Extra          |
+--------------------+---------------------+------+-----+----------------+----------------+
| rev_id             | int(10) unsigned    | NO   | PRI | NULL           | auto_increment |
| rev_page           | int(10) unsigned    | NO   | MUL | NULL           |                |
| rev_text_id        | int(10) unsigned    | NO   |     | NULL           |                |
| rev_comment        | varbinary(767)      | NO   |     | NULL           |                |
| rev_user           | int(10) unsigned    | NO   | MUL | 0              |                |
| rev_user_text      | varbinary(255)      | NO   | MUL |                |                |
| rev_timestamp      | binary(14)          | NO   | MUL |                |                |
| rev_minor_edit     | tinyint(3) unsigned | NO   |     | 0              |                |
| rev_deleted        | tinyint(3) unsigned | NO   |     | 0              |                |
| rev_len            | int(10) unsigned    | YES  |     | NULL           |                |
| rev_parent_id      | int(10) unsigned    | YES  |     | NULL           |                |
| rev_sha1           | varbinary(32)       | NO   |     |                |                |
| rev_content_model  | varbinary(32)       | YES  |     | NULL           |                |
| rev_content_format | varbinary(64)       | YES  |     | NULL           |                |
+--------------------+---------------------+------+-----+----------------+----------------+
MediaWiki版本: 1.21 – 1.24

DESCRIBE revision;

+--------------------+---------------------+------+-----+---------+----------------+
| Field              | Type                | Null | Key | Default | Extra          |
+--------------------+---------------------+------+-----+---------+----------------+
| rev_id             | int(10) unsigned    | NO   | PRI | NULL    | AUTO_INCREMENT |
| rev_page           | int(10) unsigned    | NO   | PRI | NULL    |                |
| rev_text_id        | int(10) unsigned    | NO   |     | NULL    |                |
| rev_comment        | tinyblob            | NO   |     | NULL    |                |
| rev_user           | int(10) unsigned    | NO   | MUL | 0       |                |
| rev_user_text      | varchar(255) binary | NO   | MUL | NULL    |                |
| rev_timestamp      | binary(14)          | NO   | MUL | NULL    |                |
| rev_minor_edit     | tinyint(3) unsigned | NO   |     | 0       |                |
| rev_deleted        | tinyint(3) unsigned | NO   |     | 0       |                |
| rev_len            | int(10) unsigned    | YES  |     | NULL    |                |
| rev_parent_id      | int(10) unsigned    | YES  |     | NULL    |                |
| rev_sha1           | varbinary(32)       | NO   |     | NULL    |                |
| rev_content_model  | varbinary(32)       | YES  |     | NULL    |                |
| rev_content_format | varbinary(64)       | YES  |     | NULL    |                |
+--------------------+---------------------+------+-----+---------+----------------+
MediaWiki版本: 1.19 – 1.20

DESCRIBE revision;

+----------------+---------------------+------+-----+---------+----------------+
| Field          | Type                | Null | Key | Default | Extra          |
+----------------+---------------------+------+-----+---------+----------------+
| rev_id         | int(10) unsigned    | NO   | PRI | NULL    | AUTO_INCREMENT |
| rev_page       | int(10) unsigned    | NO   | PRI | NULL    |                |
| rev_text_id    | int(10) unsigned    | NO   |     | NULL    |                |
| rev_comment    | tinyblob            | NO   |     | NULL    |                |
| rev_user       | int(10) unsigned    | NO   | MUL | 0       |                |
| rev_user_text  | varchar(255) binary | NO   | MUL | NULL    |                |
| rev_timestamp  | binary(14)          | NO   | MUL | NULL    |                |
| rev_minor_edit | tinyint(3) unsigned | NO   |     | 0       |                |
| rev_deleted    | tinyint(3) unsigned | NO   |     | 0       |                |
| rev_len        | int(10) unsigned    | YES  |     | NULL    |                |
| rev_parent_id  | int(10) unsigned    | YES  |     | NULL    |                |
| rev_sha1       | varbinary(32)       | NO   |     | NULL    |                |
+----------------+---------------------+------+-----+---------+----------------+
MediaWiki版本: 1.9 – 1.18

DESCRIBE revision;

+----------------+---------------------+------+-----+---------+----------------+
| Field          | Type                | Null | Key | Default | Extra          |
+----------------+---------------------+------+-----+---------+----------------+
| rev_id         | int(10) unsigned    | NO   | PRI | NULL    | AUTO_INCREMENT |
| rev_page       | int(10) unsigned    | NO   | PRI | NULL    |                |
| rev_text_id    | int(10) unsigned    | NO   |     | NULL    |                |
| rev_comment    | tinyblob            | NO   |     | NULL    |                |
| rev_user       | int(10) unsigned    | NO   | MUL | 0       |                |
| rev_user_text  | varchar(255) binary | NO   | MUL | NULL    |                |
| rev_timestamp  | binary(14)          | NO   | MUL | NULL    |                |
| rev_minor_edit | tinyint(3) unsigned | NO   |     | 0       |                |
| rev_deleted    | tinyint(3) unsigned | NO   |     | 0       |                |
| rev_len        | int(10) unsigned    | YES  |     | NULL    |                |
| rev_parent_id  | int(10) unsigned    | YES  |     | NULL    |                |
+----------------+---------------------+------+-----+---------+----------------+
MediaWiki版本: 1.5 – 1.8

DESCRIBE revision;

+----------------+---------------------+------+-----+---------+----------------+
| Field          | Type                | Null | Key | Default | Extra          |
+----------------+---------------------+------+-----+---------+----------------+
| rev_id         | int(8) unsigned     | NO   | PRI | NULL    | AUTO_INCREMENT |
| rev_page       | int(8) unsigned     | NO   | PRI | NULL    |                |
| rev_text_id    | int(8) unsigned     | NO   |     | NULL    |                |
| rev_comment    | tinyblob            | NO   |     | NULL    |                |
| rev_user       | int(5) unsigned     | NO   | MUL | 0       |                |
| rev_user_text  | varchar(255) binary | NO   | MUL | NULL    |                |
| rev_timestamp  | char(14) binary     | NO   | MUL | NULL    |                |
| rev_minor_edit | tinyint(1) unsigned | NO   |     | 0       |                |
| rev_deleted    | tinyint(1) unsigned | NO   |     | 0       |                |
+----------------+---------------------+------+-----+---------+----------------+

Indexes

MediaWiki版本: 1.20

SHOW INDEX IN revision;

+----------+------------+---------------------+--------------+---------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| Table    | Non_unique | Key_name            | Seq_in_index | Column_name   | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment |
+----------+------------+---------------------+--------------+---------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| revision |          0 | PRIMARY             |            1 | rev_id        | A         |           1 |     NULL | NULL   |      | BTREE      |         |               |
| revision |          0 | rev_page_id         |            1 | rev_page      | A         |           1 |     NULL | NULL   |      | BTREE      |         |               |
| revision |          0 | rev_page_id         |            2 | rev_id        | A         |           1 |     NULL | NULL   |      | BTREE      |         |               |
| revision |          1 | rev_timestamp       |            1 | rev_timestamp | A         |           1 |     NULL | NULL   |      | BTREE      |         |               |
| revision |          1 | page_timestamp      |            1 | rev_page      | A         |           1 |     NULL | NULL   |      | BTREE      |         |               |
| revision |          1 | page_timestamp      |            2 | rev_timestamp | A         |           1 |     NULL | NULL   |      | BTREE      |         |               |
| revision |          1 | user_timestamp      |            1 | rev_user      | A         |           1 |     NULL | NULL   |      | BTREE      |         |               |
| revision |          1 | user_timestamp      |            2 | rev_timestamp | A         |           1 |     NULL | NULL   |      | BTREE      |         |               |
| revision |          1 | usertext_timestamp  |            1 | rev_user_text | A         |           1 |     NULL | NULL   |      | BTREE      |         |               |
| revision |          1 | usertext_timestamp  |            2 | rev_timestamp | A         |           1 |     NULL | NULL   |      | BTREE      |         |               |
| revision |          1 | page_user_timestamp |            1 | rev_page      | A         |           1 |     NULL | NULL   |      | BTREE      |         |               |
| revision |          1 | page_user_timestamp |            2 | rev_user      | A         |           1 |     NULL | NULL   |      | BTREE      |         |               |
| revision |          1 | page_user_timestamp |            3 | rev_timestamp | A         |           1 |     NULL | NULL   |      | BTREE      |         |               |
+----------+------------+---------------------+--------------+---------------+-----------+-------------+----------+--------+------+------------+---------+---------------+

See also