Extension:EImage/ei cache table

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MediaWiki database layout

eimage table

The ei_cache table was introduced since version 3.3, and schema has been fixed since version 3.4.

Fields

ei_id

Numeric id item of the clip. This is an auto-incrementing primary key.

ei_eid

Basic identifier of the clip. In real the sha1 checksum content value from the 'ei_clip' field. EImage use it for identification of the clip before load of source.

ei_clip

Set of the attributes used for clip create. Next instances use same clip, if source is same and attributes without change.

ei_file

Sha1 checksum of the clip content, which is storage in cache. It's base string for clip and thumbnail name, and key for 'ei_pages' table items.

ei_origin_exif

Original exif tags exported from source file, saved as JSON.

ei_counter

Counter of the clip use.

ei_width

Width of the clip. It's need if EImage use the clip from cache.

ei_height

Height of the clip It's need if EImage use the clip from cache.

ei_ctime

Timestamp of the clip create.

ei_expire

Limit of the expiration.

ei_type

Number for mimetype identify of the clip.

Schema summary

DESCRIBE ei_cache;

+----------------+---------------------+------+-----+---------+----------------+
| Field          | Type                | Null | Key | Default | Extra          |
+----------------+---------------------+------+-----+---------+----------------+
| ei_id          | int(10) unsigned    | NO   | PRI | NULL    | auto_increment |
| ei_eid         | varbinary(40)       | NO   | MUL | NULL    |                |
| ei_clip        | longblob            | YES  |     | NULL    |                |
| ei_file        | varbinary(40)       | YES  |     | NULL    |                |
| ei_origin_exif | longblob            | YES  |     | NULL    |                |
| ei_counter     | int(11)             | NO   |     | 0       |                |
| ei_width       | int(11)             | NO   |     | 0       |                |
| ei_height      | int(11)             | NO   |     | 0       |                |
| ei_ctime       | binary(14)          | NO   |     | NULL    |                |
| ei_expire      | binary(14)          | NO   | MUL | NULL    |                |
| ei_type        | tinyint(3) unsigned | NO   |     | 0       |                |
+----------------+---------------------+------+-----+---------+----------------+

Indexes

SHOW INDEX IN ei_cache;

+----------+------------+----------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| Table    | Non_unique | Key_name       | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment |
+----------+------------+----------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| ei_cache |          0 | PRIMARY        |            1 | ei_id       | A         |           9 |     NULL | NULL   |      | BTREE      |         |               |
| ei_cache |          0 | ei_eid_create  |            1 | ei_eid      | A         |           9 |     NULL | NULL   |      | BTREE      |         |               |
| ei_cache |          0 | ei_eid_create  |            2 | ei_file     | A         |           9 |     NULL | NULL   | YES  | BTREE      |         |               |
| ei_cache |          1 | ei_expire_time |            1 | ei_expire   | A         |           2 |     NULL | NULL   |      | BTREE      |         |               |
+----------+------------+----------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+