docs/schema.txt

   1 SCHEMA.DOC
   2
   3 The most up-to-date schema for the tables in the database
   4 should always be "tables.sql" in the maintenance directory,
   5 which is called from the installation script. Here are a
   6 few highlights that may be out of date:
   7
   8 user    (MediaWiki users)
   9
  10   user_id
  11     integer, primary key, autoincrement
  12   user_name
  13     Usernames must be unique, must not be in the form of
  14     an IP address. _Shouldn't_ allow slashes or case
  15     conflicts. Spaces are allowed, and are _not_ converted
  16     to underscores like titles. (Conflicts?)
  17   user_password
  18     Hash of current password.
  19   user_newpassword
  20     Generated for mail-a-new-password feature
  21   user_email
  22     Note -- email should be restricted, not public info.
  23     Same with passwords. ;)
  24   user_options
  25     Newline-separated list of name=value pairs.
  26   user_token
  27     A pseudorandomly generated value that is stored in
  28     a cookie when the "remember password" feature is
  29     used (previously, a hash of the password was used, but
  30     this was vulnerable to cookie-stealing attacks)
  31
  32
  33
  34 cur     (MediaWiki "current" articles)
  35
  36   cur_id
  37     integer, primary key, autoincrement
  38   cur_namespace
  39     integer index into list of namespaces.  See the
  40     Namespace class for more details.
  41   cur_title
  42     Title of article (in dbkey form--see Title), without
  43     namespace.  The combination of namespace,title should
  44     be unique in this table.
  45   cur_text
  46     Wikitext of the article.
  47   cur_comment
  48     The summary of the last change.
  49   cur_user
  50     User id who made the last change, or 0 if unknown.
  51   cur_user_text
  52     Name of the user above, or IP address.
  53   cur_timestamp
  54     Time of the last change.
  55   cur_minor_edit
  56     Flag: 0 or 1 is last change was a "minor" edit.
  57   cur_restrictions
  58     Who may or may not edit the article.
  59   cur_counter
  60     Number of times this page has been viewed.
  61   cur_ind_title
  62     Text version of title for fulltext searches.
  63   cur_ind_text
  64     Plaintext version of text for fulltext searches.
  65   cur_is_redirect
  66     1 indicates the article is a redirect.
  67   cur_minor_edit
  68     1 indicates this was a minor edit.
  69   cur_is_new
  70     1 indicates this is the first revision of a new entry.
  71   cur_random
  72     Random value between 0 and 1, used for
  73     Special:Randompage
  74
  75
  76
  77 old     (Historical versions articles. Most fields
  78         correspond to the same fields in "cur")
  79
  80   old_id
  81   old_namespace
  82   old_title
  83   old_text
  84   old_comment
  85   old_user
  86   old_user_text
  87   old_timestamp
  88   old_minor_edit
  89   old_flags
  90     This last is currently unused.
  91
  92
  93
  94 archive (Temporary storage of deleted articles which may be restored.
  95                 Fields correspond to those of "cur" and "old")
  96   ar_namespace
  97   ar_title
  98   ar_text
  99   ar_comment
 100   ar_user
 101   ar_user_text
 102   ar_timestamp
 103   ar_minor_edit
 104   ar_flags
 105     This last is currently unused.
 106
 107
 108
 109 links   (Internal links to existing articles)
 110
 111   l_from
 112     ID of source article. (currently title, may be changed)
 113   l_to
 114     ID of target article.
 115
 116
 117
 118 brokenlinks (Internal links to non-existent articles)
 119
 120   bl_from
 121     ID of source link.
 122   bl_to
 123     Title of target link.
 124
 125
 126
 127 imagelinks (Internal links to images via [[Image:filename]] syntax)
 128
 129   il_from
 130     Title of target article.
 131   il_to
 132     Filename of target image.
 133
 134
 135
 136 categorylinks (Track category inclusions)
 137
 138   cl_from
 139     corresponds to cur_id of the linking page
 140   cl_to
 141     corresponds to cur_title of the category page
 142   cl_sortkey
 143     the title of the linking page, or an optional override
 144   cl_timestampe
 145     when the link was last added
 146
 147
 148
 149 linkscc         (Stores (possibly gzipped) serialized objects with
 150                 cache arrays to reduce database load slurping up
 151                 from links and brokenlinks.)
 152
 153   lcc_pageid
 154     The ID of the linking page
 155   lcc_cacheobj
 156     A serialized LinkCache object
 157
 158
 159
 160 image (Uploaded images and other files)
 161
 162   img_name
 163     Filename.
 164   img_size
 165     File size in bytes.
 166   img_description
 167     Description field given during upload.
 168   img_user
 169     User ID who uploaded the file.
 170   img_user_text
 171     User name who uploaded the file.
 172   img_timestamp
 173     Timestamp when upload took place.
 174
 175
 176
 177 oldimage (Old versions of images stored for potential revert)
 178
 179   oi_name
 180     Original filename.
 181   oi_archive_name
 182     Filename of stored old revision; timestamp and
 183     exclaimation point prepended to oi_name
 184   oi_size
 185     File size in bytes.
 186   oi_description
 187     Description field given during upload.
 188   oi_user
 189     User ID who uploaded the file.
 190   oi_user_text
 191     User name who uploaded the file.
 192   oi_timestamp
 193     Timestamp when upload took place.
 194
 195
 196
 197 ipblocks (IP addresses and users blocked from editing)
 198   ipb_id
 199     Primary key, introduced for privacy.
 200   ipb_address
 201     Blocked IP address in dotted-quad form or user name.
 202   ipb_user
 203     Blocked user ID or 0 for IP blocks.
 204   ipb_by
 205     User ID who made the block.
 206   ipb_reason
 207     Text comment made by blocker.
 208   ipb_timestamp
 209     Creation (or refresh) date in standard YMDHMS form. IP
 210     blocks expire automatically.
 211   ipb_auto
 212     Indicates that the IP address was banned because a banned
 213     user accessed a page through it. If this is 1, ipb_address
 214     will be hidden.
 215
 216
 217 site_stats (Site-wide statistics)
 218
 219   ss_row_id
 220     Token for where clauses.  There's only one row in
 221     this table.  At some point we might want to use a
 222     date here so we can get stats-by-date.
 223   ss_total_views
 224     Number of total views of all pages.
 225   ss_total_edits
 226     Number of total page edits.
 227   ss_good_articles
 228     Number of "countable" articles.
 229
 230
 231
 232 hitcounter (Stores an ID for every time any article is visited;
 233             depending on $wgHitcounterUpdateFreq, it is
 234             periodically cleared and the cur_counter column
 235             in the cur table updated for the all articles
 236             that have been visited.)
 237   hc_id
 238     The ID of an article, representing one hit
 239
 240
 241
 242 recentchanges
 243
 244   (Will document further when working)
 245
 246
 247
 248 watchlist
 249
 250   wl_user
 251     Foreign key -> user_id
 252   wl_namespace
 253     Namespace -> cur_namespace
 254     Note that these should only include even-numbered
 255     namespaces for regular pages; associated talk pages
 256     (odd numbered namespaces) are folded in.
 257   wl_title
 258     Page title -> cur_title
 259     Note also that the linked page may not exist in page
 260     or talk namespace, or at all.
 261
 262
 263 searchindex     (Used for MySQL fulltext searching)
 264
 265   si_page
 266     The ID of an article
 267   si_title
 268     The title of an article, indexed for searching
 269   si_text
 270     The text of an article, indexed for searching
 271
 272
 273
 274 interwiki       (Recognized interwiki link prefixes)
 275   iw_prefix
 276     The interwiki prefix, (e.g. "Meatball", or the
 277     language prefix "de")
 278   iw_url
 279     The URL of the wiki, with "$1" as a placeholder
 280     for an article name
 281   iw_local
 282     A boolean value indicating whether the wiki is
 283     in this project (used, for example, to detect
 284     redirect loops)
 285
 286