Manual:comment table
| ↑ Manual:Contents | MediaWiki database layout | comment table |
| MediaWiki version: | ≥ 1.30 |
Edits, blocks, and other actions typically have a textual comment describing the action. They are stored in a separate table to reduce the size of the main tables, and to allow for de-duplication.
De-duplication is currently best-effort to avoid locking on inserts that would be required for strict de-duplication. There may be multiple rows with the same comment_text and comment_data.
This table was introduced in Gerrit change 357892.
Fields[edit source]
comment_id[edit source]
Unique ID to identify each comment.
comment_hash[edit source]
Hash of comment_text and comment_data, for de-duplication.
comment_text[edit source]
Text comment summarizing the change, e.g. an editor's edit summary.
This text is shown in the history and contributions.
It is also 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 by Linker::formatComment().
Size limits are enforced at the application level, and should take care to crop UTF-8 strings appropriately.
comment_data[edit source]
JSON data, intended for localizing auto-generated comments. This holds structured data that is intended to be used to provide localized versions of automatically-generated comments. When not empty, comment_text should be the generated comment localized using the wiki's content language.
Schema[edit source]
| MediaWiki version: | ≥ 1.30 |
describe comment;
+--------------+---------------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +--------------+---------------------+------+-----+---------+----------------+ | comment_id | bigint(20) unsigned | NO | PRI | NULL | auto_increment | | comment_hash | int(11) | NO | MUL | NULL | | | comment_text | blob | NO | | NULL | | | comment_data | blob | YES | | NULL | | +--------------+---------------------+------+-----+---------+----------------+
