Manual:Interwiki table

The interwiki table stores the prefixes with their targets. See default interwiki prefixes. The interwiki links themselves are stored in the table. This data can be accessed using the class.

iw_prefix
The prefix of the interwiki link; this is used the same way as a namespace is used when editing.

iw_url
The target of the link; the page name is substituted for $1.

iw_api
The URL of the file. This is not used except by, when an interwiki map is requested via.

iw_wikiid
The name of the database (for a connection to be established with )

iw_local
Informs MediaWiki how it should treat interwiki links coming from external sources. If iw_local is 1, then it will treat these links as though they were generated from within the local wiki.


 * For example, the interwiki link fr: on the en.wikipedia.org project has iw_local=1 set.

Therefore, the link to https://en.wikipedia.org/wiki/fr:Accueil gracefully redirects you to the French Homepage ( Accueil ). However, the WorldCat ISSN catalog is flagged 0 on en.wikipedia.org; the link to https://en.wikipedia.org/wiki/issn:1021-9749 does not work, even though 1021-9749 would work if it were on a local Wikipedia page. See m:Help:Interwiki linking#Non-local interwikis.

iw_trans
This is used to allow transcluding templates (or other pages) from another MediaWiki installation. Both and  need to be on.

Schema summary
+---+---+--+-+-+---+ +---+---+--+-+-+---+ +---+---+--+-+-+---+
 * Field    | Type          | Null | Key | Default | Extra |
 * iw_prefix | varbinary(32) | NO  | PRI | NULL    |       |
 * iw_url   | blob          | NO   |     | NULL    |       |
 * iw_api   | blob          | NO   |     | NULL    |       |
 * iw_wikiid | varbinary(64) | NO  |     | NULL    |       |
 * iw_local | tinyint(1)    | NO   |     | NULL    |       |
 * iw_trans | tinyint(4)    | NO   |     | 0       |       |

+---+---+--+-+-+---+ +---+---+--+-+-+---+ +---+---+--+-+-+---+
 * Field    | Type          | Null | Key | Default | Extra |
 * iw_prefix | varbinary(32) | NO  | PRI | NULL    |       |
 * iw_url   | blob          | NO   |     | NULL    |       |
 * iw_local | tinyint(1)    | NO   |     | NULL    |       |
 * iw_trans | tinyint(4)    | NO   |     | 0       |       |

+---++--+-+-+---+ +---++--+-+-+---+ +---++--+-+-+---+
 * Field    | Type       | Null | Key | Default | Extra |
 * iw_prefix | char(32)  | NO   | PRI | NULL    |       |
 * iw_url   | char(127)  | NO   |     | NULL    |       |
 * iw_local | bool       | NO   |     | NULL    |       |
 * iw_trans | tinyint(1) | NO   |     | 0       |       |

+---++--+-+-+---+ +---++--+-+-+---+ +---++--+-+-+---+
 * Field    | Type       | Null | Key | Default | Extra |
 * iw_prefix | char(32)  | NO   | PRI | NULL    |       |
 * iw_url   | char(127)  | NO   |     | NULL    |       |
 * iw_local | bool       | NO   |     | NULL    |       |

Indexes
 +---++--+--+-+---+-+--++--++-+---+ +---++--+--+-+---+-+--++--++-+---+ +---++--+--+-+---+-+--++--++-+---+
 * Table    | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment |
 * interwiki |         0 | PRIMARY  |            1 | iw_prefix   | A         |           0 |     NULL | NULL   |      | BTREE      |         |               |