Вы можете самостоятельно создавать комментарии к представлениям, создав таблицу в своей схеме для хранения комментариев к каждому представлению.Затем присоедините information_schema.tables к новой таблице.
-- A view does not show the table-level comments of the underlying table.
-- nor can a view have view-level comments
CREATE TABLE `zztable` (
-- A SQL statement comment. Not stored with the table. Just documents the create table code
`zz_id` int(10) unsigned NOT NULL AUTO_INCREMENT COMMENT 'unique primary key. auto increment',
`zz_descr` varchar(255) NOT NULL COMMENT 'descriptive name. must be unique if not null',
PRIMARY KEY (`zz_id`),
UNIQUE KEY `zz_descr_UNIQUE` (`zz_descr`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='a table demonstrating table, column, and view comments. ';
-- select the table from information_schema
SELECT table_type, table_name, table_rows, table_comment
FROM information_schema.tables ta
WHERE ta.table_name LIKE 'zztable%'
ORDER BY ta.table_type, ta.table_name;
-- create a view over the commented table
CREATE OR REPLACE VIEW zztable_vw
AS
SELECT zz_id, zz_descr
FROM zztable;
-- now run the information_schema queries again to see the new view in the results
-- MySQL does not allow view-level comments.
-- create a new table to contain the view-level comments
CREATE TABLE IF NOT EXISTS `schema_view` (
`schema_view_id` INT UNSIGNED NOT NULL AUTO_INCREMENT COMMENT 'unique primary key. auto increment. ',
`schema_view_name` VARCHAR(64) NOT NULL COMMENT 'view name matches information_schema.tables.table_name for VIEW',
`schema_view_comment` VARCHAR(2048) NULL DEFAULT NULL COMMENT 'the descriptive purpose of the view. ',
PRIMARY KEY (`schema_view_id`))
ENGINE = InnoDB
COMMENT = 'contains comments for views since MySQL does not store view-level comments. Use this in a join on schema_view_name to information_schema.tables.table_name';
CREATE UNIQUE INDEX `schema_view_name_UNIQUE` ON `schema_view` (`schema_view_name` ASC);
-- insert a view comment
SELECT * FROM schema_view;
INSERT INTO schema_view
(schema_view_name, schema_view_comment)
VALUES ('zztable_vw' , 'a demonstration of documenting view metadata with comments');
COMMIT;
-- modify the query to join to the new schema_view table
-- select the view from information_schema joined to the new table
SELECT ta.table_type, ta.table_name, ta.table_rows,
-- show different comments based on table_type
CASE
WHEN ta.table_type = 'BASE TABLE' THEN ta.table_comment
WHEN ta.table_type = 'VIEW' THEN sv.schema_view_comment
ELSE NULL
END AS schema_comment,
ta.table_comment,
sv.schema_view_comment
FROM information_schema.tables ta
-- Show view comments if it exists.
LEFT OUTER JOIN schema_view sv
ON ta.table_name = sv.schema_view_name
WHERE ta.table_name LIKE 'zztable%'
ORDER BY ta.table_type, ta.table_name;
-- simplify future queries by creating a view
CREATE OR REPLACE VIEW `schema_table_vw`
AS
SELECT ta.table_type, ta.table_name, ta.table_rows,
-- show different comments based on type
CASE
WHEN ta.table_type = 'BASE TABLE' THEN ta.table_comment
WHEN ta.table_type = 'VIEW' THEN sv.schema_view_comment
ELSE NULL
END AS schema_comment
FROM information_schema.tables ta
-- Show view comments if it exists.
LEFT OUTER JOIN schema_view sv
ON ta.table_name = sv.schema_view_name
WHERE ta.table_schema = 'my_schema'
ORDER BY ta.table_type, ta.table_name;
- комментарии уровня представления и уровня таблицы теперь отображаются в schema_comment
<table width="200" border="1">
<tr>
<th scope="col">table_type</th>
<th scope="col">table_name</th>
<th scope="col">table_rows</th>
<th scope="col">schema_comment</th>
<th scope="col">table_comment</th>
<th scope="col">schema_view_comment</th>
</tr>
<tr>
<td>BASE TABLE</td>
<td>zztable</td>
<td>0</td>
<td>a table demonstrating table, column, and view comments.</td>
<td>a table demonstrating table, column, and view comments.</td>
<td>NULL</td>
</tr>
<tr>
<td>VIEW</td>
<td>zztable_vw</td>
<td>NULL</td>
<td>a demonstration of documenting view metadata with comments</td>
<td>VIEW</td>
<td>a demonstration of documenting view metadata with comments</td>
</tr>
</table>