includes/installer/MysqlUpdater.php

   1 <?php
   2 /**
   3  * MySQL-specific updater.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Deployment
  22  */
  23
  24 /**
  25  * Mysql update list and mysql-specific update functions.
  26  *
  27  * @ingroup Deployment
  28  * @since 1.17
  29  */
  30 class MysqlUpdater extends DatabaseUpdater {
  31
  32         protected function getCoreUpdateList() {
  33                 return array(
  34                         // 1.2
  35                         array( 'addField', 'ipblocks', 'ipb_id', 'patch-ipblocks.sql' ),
  36                         array( 'addField', 'ipblocks', 'ipb_expiry', 'patch-ipb_expiry.sql' ),
  37                         array( 'doInterwikiUpdate' ),
  38                         array( 'doIndexUpdate' ),
  39                         array( 'addTable', 'hitcounter', 'patch-hitcounter.sql' ),
  40                         array( 'addField', 'recentchanges', 'rc_type', 'patch-rc_type.sql' ),
  41
  42                         // 1.3
  43                         array( 'addField', 'user', 'user_real_name', 'patch-user-realname.sql' ),
  44                         array( 'addTable', 'querycache', 'patch-querycache.sql' ),
  45                         array( 'addTable', 'objectcache', 'patch-objectcache.sql' ),
  46                         array( 'addTable', 'categorylinks', 'patch-categorylinks.sql' ),
  47                         array( 'doOldLinksUpdate' ),
  48                         array( 'doFixAncientImagelinks' ),
  49                         array( 'addField', 'recentchanges', 'rc_ip', 'patch-rc_ip.sql' ),
  50
  51                         // 1.4
  52                         array( 'addIndex', 'image', 'PRIMARY', 'patch-image_name_primary.sql' ),
  53                         array( 'addField', 'recentchanges', 'rc_id', 'patch-rc_id.sql' ),
  54                         array( 'addField', 'recentchanges', 'rc_patrolled', 'patch-rc-patrol.sql' ),
  55                         array( 'addTable', 'logging', 'patch-logging.sql' ),
  56                         array( 'addField', 'user', 'user_token', 'patch-user_token.sql' ),
  57                         array( 'addField', 'watchlist', 'wl_notificationtimestamp', 'patch-email-notification.sql' ),
  58                         array( 'doWatchlistUpdate' ),
  59                         array( 'dropField', 'user', 'user_emailauthenticationtimestamp',
  60                                 'patch-email-authentication.sql' ),
  61
  62                         // 1.5
  63                         array( 'doSchemaRestructuring' ),
  64                         array( 'addField', 'logging', 'log_params', 'patch-log_params.sql' ),
  65                         array( 'checkBin', 'logging', 'log_title', 'patch-logging-title.sql', ),
  66                         array( 'addField', 'archive', 'ar_rev_id', 'patch-archive-rev_id.sql' ),
  67                         array( 'addField', 'page', 'page_len', 'patch-page_len.sql' ),
  68                         array( 'dropField', 'revision', 'inverse_timestamp', 'patch-inverse_timestamp.sql' ),
  69                         array( 'addField', 'revision', 'rev_text_id', 'patch-rev_text_id.sql' ),
  70                         array( 'addField', 'revision', 'rev_deleted', 'patch-rev_deleted.sql' ),
  71                         array( 'addField', 'image', 'img_width', 'patch-img_width.sql' ),
  72                         array( 'addField', 'image', 'img_metadata', 'patch-img_metadata.sql' ),
  73                         array( 'addField', 'user', 'user_email_token', 'patch-user_email_token.sql' ),
  74                         array( 'addField', 'archive', 'ar_text_id', 'patch-archive-text_id.sql' ),
  75                         array( 'doNamespaceSize' ),
  76                         array( 'addField', 'image', 'img_media_type', 'patch-img_media_type.sql' ),
  77                         array( 'doPagelinksUpdate' ),
  78                         array( 'dropField', 'image', 'img_type', 'patch-drop_img_type.sql' ),
  79                         array( 'doUserUniqueUpdate' ),
  80                         array( 'doUserGroupsUpdate' ),
  81                         array( 'addField', 'site_stats', 'ss_total_pages', 'patch-ss_total_articles.sql' ),
  82                         array( 'addTable', 'user_newtalk', 'patch-usernewtalk2.sql' ),
  83                         array( 'addTable', 'transcache', 'patch-transcache.sql' ),
  84                         array( 'addField', 'interwiki', 'iw_trans', 'patch-interwiki-trans.sql' ),
  85
  86                         // 1.6
  87                         array( 'doWatchlistNull' ),
  88                         array( 'addIndex', 'logging', 'times', 'patch-logging-times-index.sql' ),
  89                         array( 'addField', 'ipblocks', 'ipb_range_start', 'patch-ipb_range_start.sql' ),
  90                         array( 'doPageRandomUpdate' ),
  91                         array( 'addField', 'user', 'user_registration', 'patch-user_registration.sql' ),
  92                         array( 'doTemplatelinksUpdate' ),
  93                         array( 'addTable', 'externallinks', 'patch-externallinks.sql' ),
  94                         array( 'addTable', 'job', 'patch-job.sql' ),
  95                         array( 'addField', 'site_stats', 'ss_images', 'patch-ss_images.sql' ),
  96                         array( 'addTable', 'langlinks', 'patch-langlinks.sql' ),
  97                         array( 'addTable', 'querycache_info', 'patch-querycacheinfo.sql' ),
  98                         array( 'addTable', 'filearchive', 'patch-filearchive.sql' ),
  99                         array( 'addField', 'ipblocks', 'ipb_anon_only', 'patch-ipb_anon_only.sql' ),
 100                         array( 'addIndex', 'recentchanges', 'rc_ns_usertext', 'patch-recentchanges-utindex.sql' ),
 101                         array( 'addIndex', 'recentchanges', 'rc_user_text', 'patch-rc_user_text-index.sql' ),
 102
 103                         // 1.9
 104                         array( 'addField', 'user', 'user_newpass_time', 'patch-user_newpass_time.sql' ),
 105                         array( 'addTable', 'redirect', 'patch-redirect.sql' ),
 106                         array( 'addTable', 'querycachetwo', 'patch-querycachetwo.sql' ),
 107                         array( 'addField', 'ipblocks', 'ipb_enable_autoblock', 'patch-ipb_optional_autoblock.sql' ),
 108                         array( 'doBacklinkingIndicesUpdate' ),
 109                         array( 'addField', 'recentchanges', 'rc_old_len', 'patch-rc_len.sql' ),
 110                         array( 'addField', 'user', 'user_editcount', 'patch-user_editcount.sql' ),
 111
 112                         // 1.10
 113                         array( 'doRestrictionsUpdate' ),
 114                         array( 'addField', 'logging', 'log_id', 'patch-log_id.sql' ),
 115                         array( 'addField', 'revision', 'rev_parent_id', 'patch-rev_parent_id.sql' ),
 116                         array( 'addField', 'page_restrictions', 'pr_id', 'patch-page_restrictions_sortkey.sql' ),
 117                         array( 'addField', 'revision', 'rev_len', 'patch-rev_len.sql' ),
 118                         array( 'addField', 'recentchanges', 'rc_deleted', 'patch-rc_deleted.sql' ),
 119                         array( 'addField', 'logging', 'log_deleted', 'patch-log_deleted.sql' ),
 120                         array( 'addField', 'archive', 'ar_deleted', 'patch-ar_deleted.sql' ),
 121                         array( 'addField', 'ipblocks', 'ipb_deleted', 'patch-ipb_deleted.sql' ),
 122                         array( 'addField', 'filearchive', 'fa_deleted', 'patch-fa_deleted.sql' ),
 123                         array( 'addField', 'archive', 'ar_len', 'patch-ar_len.sql' ),
 124
 125                         // 1.11
 126                         array( 'addField', 'ipblocks', 'ipb_block_email', 'patch-ipb_emailban.sql' ),
 127                         array( 'doCategorylinksIndicesUpdate' ),
 128                         array( 'addField', 'oldimage', 'oi_metadata', 'patch-oi_metadata.sql' ),
 129                         array( 'addIndex', 'archive', 'usertext_timestamp', 'patch-archive-user-index.sql' ),
 130                         array( 'addIndex', 'image', 'img_usertext_timestamp', 'patch-image-user-index.sql' ),
 131                         array( 'addIndex', 'oldimage', 'oi_usertext_timestamp', 'patch-oldimage-user-index.sql' ),
 132                         array( 'addField', 'archive', 'ar_page_id', 'patch-archive-page_id.sql' ),
 133                         array( 'addField', 'image', 'img_sha1', 'patch-img_sha1.sql' ),
 134
 135                         // 1.12
 136                         array( 'addTable', 'protected_titles', 'patch-protected_titles.sql' ),
 137
 138                         // 1.13
 139                         array( 'addField', 'ipblocks', 'ipb_by_text', 'patch-ipb_by_text.sql' ),
 140                         array( 'addTable', 'page_props', 'patch-page_props.sql' ),
 141                         array( 'addTable', 'updatelog', 'patch-updatelog.sql' ),
 142                         array( 'addTable', 'category', 'patch-category.sql' ),
 143                         array( 'doCategoryPopulation' ),
 144                         array( 'addField', 'archive', 'ar_parent_id', 'patch-ar_parent_id.sql' ),
 145                         array( 'addField', 'user_newtalk', 'user_last_timestamp', 'patch-user_last_timestamp.sql' ),
 146                         array( 'doPopulateParentId' ),
 147                         array( 'checkBin', 'protected_titles', 'pt_title', 'patch-pt_title-encoding.sql', ),
 148                         array( 'doMaybeProfilingMemoryUpdate' ),
 149                         array( 'doFilearchiveIndicesUpdate' ),
 150
 151                         // 1.14
 152                         array( 'addField', 'site_stats', 'ss_active_users', 'patch-ss_active_users.sql' ),
 153                         array( 'doActiveUsersInit' ),
 154                         array( 'addField', 'ipblocks', 'ipb_allow_usertalk', 'patch-ipb_allow_usertalk.sql' ),
 155
 156                         // 1.15
 157                         array( 'doUniquePlTlIl' ),
 158                         array( 'addTable', 'change_tag', 'patch-change_tag.sql' ),
 159                         array( 'addTable', 'tag_summary', 'patch-tag_summary.sql' ),
 160                         array( 'addTable', 'valid_tag', 'patch-valid_tag.sql' ),
 161
 162                         // 1.16
 163                         array( 'addTable', 'user_properties', 'patch-user_properties.sql' ),
 164                         array( 'addTable', 'log_search', 'patch-log_search.sql' ),
 165                         array( 'addField', 'logging', 'log_user_text', 'patch-log_user_text.sql' ),
 166                         # listed separately from the previous update because 1.16 was released without this update
 167                         array( 'doLogUsertextPopulation' ),
 168                         array( 'doLogSearchPopulation' ),
 169                         array( 'addTable', 'l10n_cache', 'patch-l10n_cache.sql' ),
 170                         array( 'addIndex', 'log_search', 'ls_field_val', 'patch-log_search-rename-index.sql' ),
 171                         array( 'addIndex', 'change_tag', 'change_tag_rc_tag', 'patch-change_tag-indexes.sql' ),
 172                         array( 'addField', 'redirect', 'rd_interwiki', 'patch-rd_interwiki.sql' ),
 173                         array( 'doUpdateTranscacheField' ),
 174                         array( 'doUpdateMimeMinorField' ),
 175
 176                         // 1.17
 177                         array( 'addTable', 'iwlinks', 'patch-iwlinks.sql' ),
 178                         array( 'addIndex', 'iwlinks', 'iwl_prefix_title_from', 'patch-rename-iwl_prefix.sql' ),
 179                         array( 'addField', 'updatelog', 'ul_value', 'patch-ul_value.sql' ),
 180                         array( 'addField', 'interwiki', 'iw_api', 'patch-iw_api_and_wikiid.sql' ),
 181                         array( 'dropIndex', 'iwlinks', 'iwl_prefix', 'patch-kill-iwl_prefix.sql' ),
 182                         array( 'addField', 'categorylinks', 'cl_collation', 'patch-categorylinks-better-collation.sql' ),
 183                         array( 'doClFieldsUpdate' ),
 184                         array( 'doCollationUpdate' ),
 185                         array( 'addTable', 'msg_resource', 'patch-msg_resource.sql' ),
 186                         array( 'addTable', 'module_deps', 'patch-module_deps.sql' ),
 187                         array( 'dropIndex', 'archive', 'ar_page_revid', 'patch-archive_kill_ar_page_revid.sql' ),
 188                         array( 'addIndex', 'archive', 'ar_revid', 'patch-archive_ar_revid.sql' ),
 189                         array( 'doLangLinksLengthUpdate' ),
 190
 191                         // 1.18
 192                         array( 'doUserNewTalkTimestampNotNull' ),
 193                         array( 'addIndex', 'user', 'user_email', 'patch-user_email_index.sql' ),
 194                         array( 'modifyField', 'user_properties', 'up_property', 'patch-up_property.sql' ),
 195                         array( 'addTable', 'uploadstash', 'patch-uploadstash.sql' ),
 196                         array( 'addTable', 'user_former_groups', 'patch-user_former_groups.sql' ),
 197
 198                         // 1.19
 199                         array( 'addIndex', 'logging', 'type_action', 'patch-logging-type-action-index.sql' ),
 200                         array( 'addField', 'revision', 'rev_sha1', 'patch-rev_sha1.sql' ),
 201                         array( 'doMigrateUserOptions' ),
 202                         array( 'dropField', 'user', 'user_options', 'patch-drop-user_options.sql' ),
 203                         array( 'addField', 'archive', 'ar_sha1', 'patch-ar_sha1.sql' ),
 204                         array( 'addIndex', 'page', 'page_redirect_namespace_len',
 205                                 'patch-page_redirect_namespace_len.sql' ),
 206                         array( 'addField', 'uploadstash', 'us_chunk_inx', 'patch-uploadstash_chunk.sql' ),
 207                         array( 'addfield', 'job', 'job_timestamp', 'patch-jobs-add-timestamp.sql' ),
 208
 209                         // 1.20
 210                         array( 'addIndex', 'revision', 'page_user_timestamp', 'patch-revision-user-page-index.sql' ),
 211                         array( 'addField', 'ipblocks', 'ipb_parent_block_id', 'patch-ipb-parent-block-id.sql' ),
 212                         array( 'addIndex', 'ipblocks', 'ipb_parent_block_id', 'patch-ipb-parent-block-id-index.sql' ),
 213                         array( 'dropField', 'category', 'cat_hidden', 'patch-cat_hidden.sql' ),
 214
 215                         // 1.21
 216                         array( 'addField', 'revision', 'rev_content_format', 'patch-revision-rev_content_format.sql' ),
 217                         array( 'addField', 'revision', 'rev_content_model', 'patch-revision-rev_content_model.sql' ),
 218                         array( 'addField', 'archive', 'ar_content_format', 'patch-archive-ar_content_format.sql' ),
 219                         array( 'addField', 'archive', 'ar_content_model', 'patch-archive-ar_content_model.sql' ),
 220                         array( 'addField', 'page', 'page_content_model', 'patch-page-page_content_model.sql' ),
 221                         array( 'dropField', 'site_stats', 'ss_admins', 'patch-drop-ss_admins.sql' ),
 222                         array( 'dropField', 'recentchanges', 'rc_moved_to_title', 'patch-rc_moved.sql' ),
 223                         array( 'addTable', 'sites', 'patch-sites.sql' ),
 224                         array( 'addField', 'filearchive', 'fa_sha1', 'patch-fa_sha1.sql' ),
 225                         array( 'addField', 'job', 'job_token', 'patch-job_token.sql' ),
 226                         array( 'addField', 'job', 'job_attempts', 'patch-job_attempts.sql' ),
 227                         array( 'doEnableProfiling' ),
 228                         array( 'addField', 'uploadstash', 'us_props', 'patch-uploadstash-us_props.sql' ),
 229                         array( 'modifyField', 'user_groups', 'ug_group', 'patch-ug_group-length-increase-255.sql' ),
 230                         array( 'modifyField', 'user_former_groups', 'ufg_group',
 231                                 'patch-ufg_group-length-increase-255.sql' ),
 232                         array( 'addIndex', 'page_props', 'pp_propname_page',
 233                                 'patch-page_props-propname-page-index.sql' ),
 234                         array( 'addIndex', 'image', 'img_media_mime', 'patch-img_media_mime-index.sql' ),
 235
 236                         // 1.22
 237                         array( 'doIwlinksIndexNonUnique' ),
 238                         array( 'addIndex', 'iwlinks', 'iwl_prefix_from_title',
 239                                 'patch-iwlinks-from-title-index.sql' ),
 240                         array( 'addField', 'archive', 'ar_id', 'patch-archive-ar_id.sql' ),
 241                         array( 'addField', 'externallinks', 'el_id', 'patch-externallinks-el_id.sql' ),
 242                 );
 243         }
 244
 245         /**
 246          * 1.4 betas were missing the 'binary' marker from logging.log_title,
 247          * which causes a collation mismatch error on joins in MySQL 4.1.
 248          *
 249          * @param string $table table name
 250          * @param string $field field name to check
 251          * @param string $patchFile path to the patch to correct the field
 252          */
 253         protected function checkBin( $table, $field, $patchFile ) {
 254                 if ( !$this->doTable( $table ) ) {
 255                         return true;
 256                 }
 257
 258                 $fieldInfo = $this->db->fieldInfo( $table, $field );
 259                 if ( $fieldInfo->isBinary() ) {
 260                         $this->output( "...$table table has correct $field encoding.\n" );
 261                 } else {
 262                         $this->applyPatch( $patchFile, false, "Fixing $field encoding on $table table" );
 263                 }
 264         }
 265
 266         /**
 267          * Check whether an index contain a field
 268          *
 269          * @param string $table table name
 270          * @param string $index index name to check
 271          * @param string $field field that should be in the index
 272          * @return Boolean
 273          */
 274         protected function indexHasField( $table, $index, $field ) {
 275                 if ( !$this->doTable( $table ) ) {
 276                         return true;
 277                 }
 278
 279                 $info = $this->db->indexInfo( $table, $index, __METHOD__ );
 280                 if ( $info ) {
 281                         foreach ( $info as $row ) {
 282                                 if ( $row->Column_name == $field ) {
 283                                         $this->output( "...index $index on table $table includes field $field.\n" );
 284
 285                                         return true;
 286                                 }
 287                         }
 288                 }
 289                 $this->output( "...index $index on table $table has no field $field; added.\n" );
 290
 291                 return false;
 292         }
 293
 294         /**
 295          * Check that interwiki table exists; if it doesn't source it
 296          */
 297         protected function doInterwikiUpdate() {
 298                 global $IP;
 299
 300                 if ( !$this->doTable( 'interwiki' ) ) {
 301                         return true;
 302                 }
 303
 304                 if ( $this->db->tableExists( "interwiki", __METHOD__ ) ) {
 305                         $this->output( "...already have interwiki table\n" );
 306
 307                         return;
 308                 }
 309
 310                 $this->applyPatch( 'patch-interwiki.sql', false, 'Creating interwiki table' );
 311                 $this->applyPatch(
 312                         "$IP/maintenance/interwiki.sql",
 313                         true,
 314                         'Adding default interwiki definitions'
 315                 );
 316         }
 317
 318         /**
 319          * Check that proper indexes are in place
 320          */
 321         protected function doIndexUpdate() {
 322                 $meta = $this->db->fieldInfo( 'recentchanges', 'rc_timestamp' );
 323                 if ( $meta === false ) {
 324                         throw new MWException( 'Missing rc_timestamp field of recentchanges table. Should not happen.' );
 325                 }
 326                 if ( $meta->isMultipleKey() ) {
 327                         $this->output( "...indexes seem up to 20031107 standards.\n" );
 328
 329                         return;
 330                 }
 331
 332                 $this->applyPatch( 'patch-indexes.sql', true, "Updating indexes to 20031107" );
 333         }
 334
 335         protected function doOldLinksUpdate() {
 336                 $cl = $this->maintenance->runChild( 'ConvertLinks' );
 337                 $cl->execute();
 338         }
 339
 340         protected function doFixAncientImagelinks() {
 341                 $info = $this->db->fieldInfo( 'imagelinks', 'il_from' );
 342                 if ( !$info || $info->type() !== 'string' ) {
 343                         $this->output( "...il_from OK\n" );
 344
 345                         return;
 346                 }
 347
 348                 $applied = $this->applyPatch(
 349                         'patch-fix-il_from.sql',
 350                         false,
 351                         'Fixing ancient broken imagelinks table.'
 352                 );
 353
 354                 if ( $applied ) {
 355                         $this->output( "NOTE: you will have to run maintenance/refreshLinks.php after this." );
 356                 }
 357         }
 358
 359         /**
 360          * Check if we need to add talk page rows to the watchlist
 361          */
 362         function doWatchlistUpdate() {
 363                 $talk = $this->db->selectField( 'watchlist', 'count(*)', 'wl_namespace & 1', __METHOD__ );
 364                 $nontalk = $this->db->selectField(
 365                         'watchlist',
 366                         'count(*)',
 367                         'NOT (wl_namespace & 1)',
 368                         __METHOD__
 369                 );
 370                 if ( $talk == $nontalk ) {
 371                         $this->output( "...watchlist talk page rows already present.\n" );
 372
 373                         return;
 374                 }
 375
 376                 $this->output( "Adding missing watchlist talk page rows... " );
 377                 $this->db->insertSelect( 'watchlist', 'watchlist',
 378                         array(
 379                                 'wl_user' => 'wl_user',
 380                                 'wl_namespace' => 'wl_namespace | 1',
 381                                 'wl_title' => 'wl_title',
 382                                 'wl_notificationtimestamp' => 'wl_notificationtimestamp'
 383                         ), array( 'NOT (wl_namespace & 1)' ), __METHOD__, 'IGNORE' );
 384                 $this->output( "done.\n" );
 385         }
 386
 387         function doSchemaRestructuring() {
 388                 if ( $this->db->tableExists( 'page', __METHOD__ ) ) {
 389                         $this->output( "...page table already exists.\n" );
 390
 391                         return;
 392                 }
 393
 394                 $this->output( "...converting from cur/old to page/revision/text DB structure.\n" );
 395                 $this->output( wfTimestamp( TS_DB ) );
 396                 $this->output( "......checking for duplicate entries.\n" );
 397
 398                 list( $cur, $old, $page, $revision, $text ) = $this->db->tableNamesN(
 399                         'cur',
 400                         'old',
 401                         'page',
 402                         'revision',
 403                         'text'
 404                 );
 405
 406                 $rows = $this->db->query( "
 407                         SELECT cur_title, cur_namespace, COUNT(cur_namespace) AS c
 408                         FROM $cur
 409                         GROUP BY cur_title, cur_namespace
 410                         HAVING c>1",
 411                         __METHOD__
 412                 );
 413
 414                 if ( $rows->numRows() > 0 ) {
 415                         $this->output( wfTimestamp( TS_DB ) );
 416                         $this->output( "......<b>Found duplicate entries</b>\n" );
 417                         $this->output( sprintf( "<b>      %-60s %3s %5s</b>\n", 'Title', 'NS', 'Count' ) );
 418                         $duplicate = array();
 419                         foreach ( $rows as $row ) {
 420                                 if ( !isset( $duplicate[$row->cur_namespace] ) ) {
 421                                         $duplicate[$row->cur_namespace] = array();
 422                                 }
 423
 424                                 $duplicate[$row->cur_namespace][] = $row->cur_title;
 425                                 $this->output( sprintf(
 426                                         "      %-60s %3s %5s\n",
 427                                         $row->cur_title, $row->cur_namespace,
 428                                         $row->c
 429                                 ) );
 430                         }
 431                         $sql = "SELECT cur_title, cur_namespace, cur_id, cur_timestamp FROM $cur WHERE ";
 432                         $firstCond = true;
 433                         foreach ( $duplicate as $ns => $titles ) {
 434                                 if ( $firstCond ) {
 435                                         $firstCond = false;
 436                                 } else {
 437                                         $sql .= ' OR ';
 438                                 }
 439                                 $sql .= "( cur_namespace = {$ns} AND cur_title in (";
 440                                 $first = true;
 441                                 foreach ( $titles as $t ) {
 442                                         if ( $first ) {
 443                                                 $sql .= $this->db->addQuotes( $t );
 444                                                 $first = false;
 445                                         } else {
 446                                                 $sql .= ', ' . $this->db->addQuotes( $t );
 447                                         }
 448                                 }
 449                                 $sql .= ") ) \n";
 450                         }
 451                         # By sorting descending, the most recent entry will be the first in the list.
 452                         # All following entries will be deleted by the next while-loop.
 453                         $sql .= 'ORDER BY cur_namespace, cur_title, cur_timestamp DESC';
 454
 455                         $rows = $this->db->query( $sql, __METHOD__ );
 456
 457                         $prev_title = $prev_namespace = false;
 458                         $deleteId = array();
 459
 460                         foreach ( $rows as $row ) {
 461                                 if ( $prev_title == $row->cur_title && $prev_namespace == $row->cur_namespace ) {
 462                                         $deleteId[] = $row->cur_id;
 463                                 }
 464                                 $prev_title = $row->cur_title;
 465                                 $prev_namespace = $row->cur_namespace;
 466                         }
 467                         $sql = "DELETE FROM $cur WHERE cur_id IN ( " . join( ',', $deleteId ) . ')';
 468                         $this->db->query( $sql, __METHOD__ );
 469                         $this->output( wfTimestamp( TS_DB ) );
 470                         $this->output( "......<b>Deleted</b> " . $this->db->affectedRows() . " records.\n" );
 471                 }
 472
 473                 $this->output( wfTimestamp( TS_DB ) );
 474                 $this->output( "......Creating tables.\n" );
 475                 $this->db->query( "CREATE TABLE $page (
 476                         page_id int(8) unsigned NOT NULL auto_increment,
 477                         page_namespace int NOT NULL,
 478                         page_title varchar(255) binary NOT NULL,
 479                         page_restrictions tinyblob NOT NULL,
 480                         page_counter bigint(20) unsigned NOT NULL default '0',
 481                         page_is_redirect tinyint(1) unsigned NOT NULL default '0',
 482                         page_is_new tinyint(1) unsigned NOT NULL default '0',
 483                         page_random real unsigned NOT NULL,
 484                         page_touched char(14) binary NOT NULL default '',
 485                         page_latest int(8) unsigned NOT NULL,
 486                         page_len int(8) unsigned NOT NULL,
 487
 488                         PRIMARY KEY page_id (page_id),
 489                         UNIQUE INDEX name_title (page_namespace,page_title),
 490                         INDEX (page_random),
 491                         INDEX (page_len)
 492                         ) ENGINE=InnoDB", __METHOD__ );
 493                 $this->db->query( "CREATE TABLE $revision (
 494                         rev_id int(8) unsigned NOT NULL auto_increment,
 495                         rev_page int(8) unsigned NOT NULL,
 496                         rev_comment tinyblob NOT NULL,
 497                         rev_user int(5) unsigned NOT NULL default '0',
 498                         rev_user_text varchar(255) binary NOT NULL default '',
 499                         rev_timestamp char(14) binary NOT NULL default '',
 500                         rev_minor_edit tinyint(1) unsigned NOT NULL default '0',
 501                         rev_deleted tinyint(1) unsigned NOT NULL default '0',
 502                         rev_len int(8) unsigned,
 503                         rev_parent_id int(8) unsigned default NULL,
 504                         PRIMARY KEY rev_page_id (rev_page, rev_id),
 505                         UNIQUE INDEX rev_id (rev_id),
 506                         INDEX rev_timestamp (rev_timestamp),
 507                         INDEX page_timestamp (rev_page,rev_timestamp),
 508                         INDEX user_timestamp (rev_user,rev_timestamp),
 509                         INDEX usertext_timestamp (rev_user_text,rev_timestamp)
 510                         ) ENGINE=InnoDB", __METHOD__ );
 511
 512                 $this->output( wfTimestamp( TS_DB ) );
 513                 $this->output( "......Locking tables.\n" );
 514                 $this->db->query(
 515                         "LOCK TABLES $page WRITE, $revision WRITE, $old WRITE, $cur WRITE",
 516                         __METHOD__
 517                 );
 518
 519                 $maxold = intval( $this->db->selectField( 'old', 'max(old_id)', '', __METHOD__ ) );
 520                 $this->output( wfTimestamp( TS_DB ) );
 521                 $this->output( "......maxold is {$maxold}\n" );
 522
 523                 $this->output( wfTimestamp( TS_DB ) );
 524                 global $wgLegacySchemaConversion;
 525                 if ( $wgLegacySchemaConversion ) {
 526                         // Create HistoryBlobCurStub entries.
 527                         // Text will be pulled from the leftover 'cur' table at runtime.
 528                         $this->output( "......Moving metadata from cur; using blob references to text in cur table.\n" );
 529                         $cur_text = "concat('O:18:\"historyblobcurstub\":1:{s:6:\"mCurId\";i:',cur_id,';}')";
 530                         $cur_flags = "'object'";
 531                 } else {
 532                         // Copy all cur text in immediately: this may take longer but avoids
 533                         // having to keep an extra table around.
 534                         $this->output( "......Moving text from cur.\n" );
 535                         $cur_text = 'cur_text';
 536                         $cur_flags = "''";
 537                 }
 538                 $this->db->query(
 539                         "INSERT INTO $old (old_namespace, old_title, old_text, old_comment, old_user,
 540                                 old_user_text, old_timestamp, old_minor_edit, old_flags)
 541                         SELECT cur_namespace, cur_title, $cur_text, cur_comment, cur_user, cur_user_text,
 542                                 cur_timestamp, cur_minor_edit, $cur_flags
 543                         FROM $cur",
 544                         __METHOD__
 545                 );
 546
 547                 $this->output( wfTimestamp( TS_DB ) );
 548                 $this->output( "......Setting up revision table.\n" );
 549                 $this->db->query(
 550                         "INSERT INTO $revision (rev_id, rev_page, rev_comment, rev_user,
 551                                 rev_user_text, rev_timestamp, rev_minor_edit)
 552                         SELECT old_id, cur_id, old_comment, old_user, old_user_text,
 553                                 old_timestamp, old_minor_edit
 554                         FROM $old,$cur WHERE old_namespace=cur_namespace AND old_title=cur_title",
 555                         __METHOD__
 556                 );
 557
 558                 $this->output( wfTimestamp( TS_DB ) );
 559                 $this->output( "......Setting up page table.\n" );
 560                 $this->db->query(
 561                         "INSERT INTO $page (page_id, page_namespace, page_title,
 562                                 page_restrictions, page_counter, page_is_redirect, page_is_new, page_random,
 563                                 page_touched, page_latest, page_len)
 564                         SELECT cur_id, cur_namespace, cur_title, cur_restrictions, cur_counter,
 565                                 cur_is_redirect, cur_is_new, cur_random, cur_touched, rev_id, LENGTH(cur_text)
 566                         FROM $cur,$revision
 567                         WHERE cur_id=rev_page AND rev_timestamp=cur_timestamp AND rev_id > {$maxold}",
 568                         __METHOD__
 569                 );
 570
 571                 $this->output( wfTimestamp( TS_DB ) );
 572                 $this->output( "......Unlocking tables.\n" );
 573                 $this->db->query( "UNLOCK TABLES", __METHOD__ );
 574
 575                 $this->output( wfTimestamp( TS_DB ) );
 576                 $this->output( "......Renaming old.\n" );
 577                 $this->db->query( "ALTER TABLE $old RENAME TO $text", __METHOD__ );
 578
 579                 $this->output( wfTimestamp( TS_DB ) );
 580                 $this->output( "...done.\n" );
 581         }
 582
 583         protected function doNamespaceSize() {
 584                 $tables = array(
 585                         'page' => 'page',
 586                         'archive' => 'ar',
 587                         'recentchanges' => 'rc',
 588                         'watchlist' => 'wl',
 589                         'querycache' => 'qc',
 590                         'logging' => 'log',
 591                 );
 592                 foreach ( $tables as $table => $prefix ) {
 593                         $field = $prefix . '_namespace';
 594
 595                         $tablename = $this->db->tableName( $table );
 596                         $result = $this->db->query( "SHOW COLUMNS FROM $tablename LIKE '$field'", __METHOD__ );
 597                         $info = $this->db->fetchObject( $result );
 598
 599                         if ( substr( $info->Type, 0, 3 ) == 'int' ) {
 600                                 $this->output( "...$field is already a full int ($info->Type).\n" );
 601                         } else {
 602                                 $this->output( "Promoting $field from $info->Type to int... " );
 603                                 $this->db->query( "ALTER TABLE $tablename MODIFY $field int NOT NULL", __METHOD__ );
 604                                 $this->output( "done.\n" );
 605                         }
 606                 }
 607         }
 608
 609         protected function doPagelinksUpdate() {
 610                 if ( $this->db->tableExists( 'pagelinks', __METHOD__ ) ) {
 611                         $this->output( "...already have pagelinks table.\n" );
 612
 613                         return;
 614                 }
 615
 616                 $this->applyPatch(
 617                         'patch-pagelinks.sql',
 618                         false,
 619                         'Converting links and brokenlinks tables to pagelinks'
 620                 );
 621
 622                 global $wgContLang;
 623                 foreach ( MWNamespace::getCanonicalNamespaces() as $ns => $name ) {
 624                         if ( $ns == 0 ) {
 625                                 continue;
 626                         }
 627
 628                         $this->output( "Cleaning up broken links for namespace $ns... " );
 629
 630                         $pagelinks = $this->db->tableName( 'pagelinks' );
 631                         $name = $wgContLang->getNsText( $ns );
 632                         $prefix = $this->db->strencode( $name );
 633                         $likeprefix = str_replace( '_', '\\_', $prefix );
 634
 635                         $sql = "UPDATE $pagelinks
 636                                            SET pl_namespace=$ns,
 637                                                    pl_title=TRIM(LEADING '$prefix:' FROM pl_title)
 638                                          WHERE pl_namespace=0
 639                                            AND pl_title LIKE '$likeprefix:%'";
 640
 641                         $this->db->query( $sql, __METHOD__ );
 642                         $this->output( "done.\n" );
 643                 }
 644         }
 645
 646         protected function doUserUniqueUpdate() {
 647                 if ( !$this->doTable( 'user' ) ) {
 648                         return true;
 649                 }
 650
 651                 $duper = new UserDupes( $this->db, array( $this, 'output' ) );
 652                 if ( $duper->hasUniqueIndex() ) {
 653                         $this->output( "...already have unique user_name index.\n" );
 654
 655                         return;
 656                 }
 657
 658                 if ( !$duper->clearDupes() ) {
 659                         $this->output( "WARNING: This next step will probably fail due to unfixed duplicates...\n" );
 660                 }
 661                 $this->applyPatch( 'patch-user_nameindex.sql', false, "Adding unique index on user_name" );
 662         }
 663
 664         protected function doUserGroupsUpdate() {
 665                 if ( !$this->doTable( 'user_groups' ) ) {
 666                         return true;
 667                 }
 668
 669                 if ( $this->db->tableExists( 'user_groups', __METHOD__ ) ) {
 670                         $info = $this->db->fieldInfo( 'user_groups', 'ug_group' );
 671                         if ( $info->type() == 'int' ) {
 672                                 $oldug = $this->db->tableName( 'user_groups' );
 673                                 $newug = $this->db->tableName( 'user_groups_bogus' );
 674                                 $this->output( "user_groups table exists but is in bogus intermediate " .
 675                                         "format. Renaming to $newug... " );
 676                                 $this->db->query( "ALTER TABLE $oldug RENAME TO $newug", __METHOD__ );
 677                                 $this->output( "done.\n" );
 678
 679                                 $this->applyPatch( 'patch-user_groups.sql', false, "Re-adding fresh user_groups table" );
 680
 681                                 $this->output( "***\n" );
 682                                 $this->output( "*** WARNING: You will need to manually fix up user " .
 683                                         "permissions in the user_groups\n" );
 684                                 $this->output( "*** table. Old 1.5 alpha versions did some pretty funky stuff...\n" );
 685                                 $this->output( "***\n" );
 686                         } else {
 687                                 $this->output( "...user_groups table exists and is in current format.\n" );
 688                         }
 689
 690                         return;
 691                 }
 692
 693                 $this->applyPatch( 'patch-user_groups.sql', false, "Adding user_groups table" );
 694
 695                 if ( !$this->db->tableExists( 'user_rights', __METHOD__ ) ) {
 696                         if ( $this->db->fieldExists( 'user', 'user_rights', __METHOD__ ) ) {
 697                                 $this->db->applyPatch(
 698                                         'patch-user_rights.sql',
 699                                         false,
 700                                         'Upgrading from a 1.3 or older database? Breaking out user_rights for conversion'
 701                                 );
 702                         } else {
 703                                 $this->output( "*** WARNING: couldn't locate user_rights table or field for upgrade.\n" );
 704                                 $this->output( "*** You may need to manually configure some sysops by manipulating\n" );
 705                                 $this->output( "*** the user_groups table.\n" );
 706
 707                                 return;
 708                         }
 709                 }
 710
 711                 $this->output( "Converting user_rights table to user_groups... " );
 712                 $result = $this->db->select( 'user_rights',
 713                         array( 'ur_user', 'ur_rights' ),
 714                         array( "ur_rights != ''" ),
 715                         __METHOD__ );
 716
 717                 foreach ( $result as $row ) {
 718                         $groups = array_unique(
 719                                 array_map( 'trim',
 720                                         explode( ',', $row->ur_rights ) ) );
 721
 722                         foreach ( $groups as $group ) {
 723                                 $this->db->insert( 'user_groups',
 724                                         array(
 725                                                 'ug_user' => $row->ur_user,
 726                                                 'ug_group' => $group ),
 727                                         __METHOD__ );
 728                         }
 729                 }
 730                 $this->output( "done.\n" );
 731         }
 732
 733         /**
 734          * Make sure wl_notificationtimestamp can be NULL,
 735          * and update old broken items.
 736          */
 737         protected function doWatchlistNull() {
 738                 $info = $this->db->fieldInfo( 'watchlist', 'wl_notificationtimestamp' );
 739                 if ( !$info ) {
 740                         return;
 741                 }
 742                 if ( $info->isNullable() ) {
 743                         $this->output( "...wl_notificationtimestamp is already nullable.\n" );
 744
 745                         return;
 746                 }
 747
 748                 $this->applyPatch(
 749                         'patch-watchlist-null.sql',
 750                         false,
 751                         'Making wl_notificationtimestamp nullable'
 752                 );
 753         }
 754
 755         /**
 756          * Set page_random field to a random value where it is equals to 0.
 757          *
 758          * @see bug 3946
 759          */
 760         protected function doPageRandomUpdate() {
 761                 $page = $this->db->tableName( 'page' );
 762                 $this->db->query( "UPDATE $page SET page_random = RAND() WHERE page_random = 0", __METHOD__ );
 763                 $rows = $this->db->affectedRows();
 764
 765                 if ( $rows ) {
 766                         $this->output( "Set page_random to a random value on $rows rows where it was set to 0\n" );
 767                 } else {
 768                         $this->output( "...no page_random rows needed to be set\n" );
 769                 }
 770         }
 771
 772         protected function doTemplatelinksUpdate() {
 773                 if ( $this->db->tableExists( 'templatelinks', __METHOD__ ) ) {
 774                         $this->output( "...templatelinks table already exists\n" );
 775
 776                         return;
 777                 }
 778
 779                 $this->applyPatch( 'patch-templatelinks.sql', false, "Creating templatelinks table" );
 780
 781                 $this->output( "Populating...\n" );
 782                 if ( wfGetLB()->getServerCount() > 1 ) {
 783                         // Slow, replication-friendly update
 784                         $res = $this->db->select( 'pagelinks', array( 'pl_from', 'pl_namespace', 'pl_title' ),
 785                                 array( 'pl_namespace' => NS_TEMPLATE ), __METHOD__ );
 786                         $count = 0;
 787                         foreach ( $res as $row ) {
 788                                 $count = ( $count + 1 ) % 100;
 789                                 if ( $count == 0 ) {
 790                                         wfWaitForSlaves();
 791                                 }
 792                                 $this->db->insert( 'templatelinks',
 793                                         array(
 794                                                 'tl_from' => $row->pl_from,
 795                                                 'tl_namespace' => $row->pl_namespace,
 796                                                 'tl_title' => $row->pl_title,
 797                                         ), __METHOD__
 798                                 );
 799                         }
 800                 } else {
 801                         // Fast update
 802                         $this->db->insertSelect( 'templatelinks', 'pagelinks',
 803                                 array(
 804                                         'tl_from' => 'pl_from',
 805                                         'tl_namespace' => 'pl_namespace',
 806                                         'tl_title' => 'pl_title'
 807                                 ), array(
 808                                         'pl_namespace' => 10
 809                                 ), __METHOD__
 810                         );
 811                 }
 812                 $this->output( "Done. Please run maintenance/refreshLinks.php for a more " .
 813                         "thorough templatelinks update.\n" );
 814         }
 815
 816         protected function doBacklinkingIndicesUpdate() {
 817                 if ( !$this->indexHasField( 'pagelinks', 'pl_namespace', 'pl_from' ) ||
 818                         !$this->indexHasField( 'templatelinks', 'tl_namespace', 'tl_from' ) ||
 819                         !$this->indexHasField( 'imagelinks', 'il_to', 'il_from' )
 820                 ) {
 821                         $this->applyPatch( 'patch-backlinkindexes.sql', false, "Updating backlinking indices" );
 822                 }
 823         }
 824
 825         /**
 826          * Adding page_restrictions table, obsoleting page.page_restrictions.
 827          * Migrating old restrictions to new table
 828          * -- Andrew Garrett, January 2007.
 829          */
 830         protected function doRestrictionsUpdate() {
 831                 if ( $this->db->tableExists( 'page_restrictions', __METHOD__ ) ) {
 832                         $this->output( "...page_restrictions table already exists.\n" );
 833
 834                         return;
 835                 }
 836
 837                 $this->applyPatch(
 838                         'patch-page_restrictions.sql',
 839                         false,
 840                         'Creating page_restrictions table (1/2)'
 841                 );
 842                 $this->applyPatch(
 843                         'patch-page_restrictions_sortkey.sql',
 844                         false,
 845                         'Creating page_restrictions table (2/2)'
 846                 );
 847                 $this->output( "done.\n" );
 848
 849                 $this->output( "Migrating old restrictions to new table...\n" );
 850                 $task = $this->maintenance->runChild( 'UpdateRestrictions' );
 851                 $task->execute();
 852         }
 853
 854         protected function doCategorylinksIndicesUpdate() {
 855                 if ( !$this->indexHasField( 'categorylinks', 'cl_sortkey', 'cl_from' ) ) {
 856                         $this->applyPatch( 'patch-categorylinksindex.sql', false, "Updating categorylinks Indices" );
 857                 }
 858         }
 859
 860         protected function doCategoryPopulation() {
 861                 if ( $this->updateRowExists( 'populate category' ) ) {
 862                         $this->output( "...category table already populated.\n" );
 863
 864                         return;
 865                 }
 866
 867                 $this->output(
 868                         "Populating category table, printing progress markers. " .
 869                         "For large databases, you\n" .
 870                         "may want to hit Ctrl-C and do this manually with maintenance/\n" .
 871                         "populateCategory.php.\n"
 872                 );
 873                 $task = $this->maintenance->runChild( 'PopulateCategory' );
 874                 $task->execute();
 875                 $this->output( "Done populating category table.\n" );
 876         }
 877
 878         protected function doPopulateParentId() {
 879                 if ( !$this->updateRowExists( 'populate rev_parent_id' ) ) {
 880                         $this->output(
 881                                 "Populating rev_parent_id fields, printing progress markers. For large\n" .
 882                                 "databases, you may want to hit Ctrl-C and do this manually with\n" .
 883                                 "maintenance/populateParentId.php.\n" );
 884
 885                         $task = $this->maintenance->runChild( 'PopulateParentId' );
 886                         $task->execute();
 887                 }
 888         }
 889
 890         protected function doEnableProfiling() {
 891                 global $wgProfileToDatabase;
 892
 893                 if ( !$this->doTable( 'profiling' ) ) {
 894                         return true;
 895                 }
 896
 897                 if ( $wgProfileToDatabase === true && !$this->db->tableExists( 'profiling', __METHOD__ ) ) {
 898                         $this->applyPatch( 'patch-profiling.sql', false, 'Add profiling table' );
 899                 }
 900         }
 901
 902         protected function doMaybeProfilingMemoryUpdate() {
 903                 if ( !$this->doTable( 'profiling' ) ) {
 904                         return true;
 905                 }
 906
 907                 if ( !$this->db->tableExists( 'profiling', __METHOD__ ) ) {
 908                         return true;
 909                 } elseif ( $this->db->fieldExists( 'profiling', 'pf_memory', __METHOD__ ) ) {
 910                         $this->output( "...profiling table has pf_memory field.\n" );
 911
 912                         return true;
 913                 }
 914
 915                 return $this->applyPatch(
 916                         'patch-profiling-memory.sql',
 917                         false,
 918                         'Adding pf_memory field to table profiling'
 919                 );
 920         }
 921
 922         protected function doFilearchiveIndicesUpdate() {
 923                 $info = $this->db->indexInfo( 'filearchive', 'fa_user_timestamp', __METHOD__ );
 924                 if ( !$info ) {
 925                         $this->applyPatch( 'patch-filearchive-user-index.sql', false, "Updating filearchive indices" );
 926                 }
 927
 928                 return true;
 929         }
 930
 931         protected function doUniquePlTlIl() {
 932                 $info = $this->db->indexInfo( 'pagelinks', 'pl_namespace' );
 933                 if ( is_array( $info ) && !$info[0]->Non_unique ) {
 934                         $this->output( "...pl_namespace, tl_namespace, il_to indices are already UNIQUE.\n" );
 935
 936                         return true;
 937                 }
 938                 if ( $this->skipSchema ) {
 939                         $this->output( "...skipping schema change (making pl_namespace, tl_namespace " .
 940                                 "and il_to indices UNIQUE).\n" );
 941
 942                         return false;
 943                 }
 944
 945                 return $this->applyPatch(
 946                         'patch-pl-tl-il-unique.sql',
 947                         false,
 948                         'Making pl_namespace, tl_namespace and il_to indices UNIQUE'
 949                 );
 950         }
 951
 952         protected function doUpdateMimeMinorField() {
 953                 if ( $this->updateRowExists( 'mime_minor_length' ) ) {
 954                         $this->output( "...*_mime_minor fields are already long enough.\n" );
 955
 956                         return;
 957                 }
 958
 959                 $this->applyPatch(
 960                         'patch-mime_minor_length.sql',
 961                         false,
 962                         'Altering all *_mime_minor fields to 100 bytes in size'
 963                 );
 964         }
 965
 966         protected function doClFieldsUpdate() {
 967                 if ( $this->updateRowExists( 'cl_fields_update' ) ) {
 968                         $this->output( "...categorylinks up-to-date.\n" );
 969
 970                         return;
 971                 }
 972
 973                 $this->applyPatch(
 974                         'patch-categorylinks-better-collation2.sql',
 975                         false,
 976                         'Updating categorylinks (again)'
 977                 );
 978         }
 979
 980         protected function doLangLinksLengthUpdate() {
 981                 $langlinks = $this->db->tableName( 'langlinks' );
 982                 $res = $this->db->query( "SHOW COLUMNS FROM $langlinks LIKE 'll_lang'" );
 983                 $row = $this->db->fetchObject( $res );
 984
 985                 if ( $row && $row->Type == "varbinary(10)" ) {
 986                         $this->applyPatch(
 987                                 'patch-langlinks-ll_lang-20.sql',
 988                                 false,
 989                                 'Updating length of ll_lang in langlinks'
 990                         );
 991                 } else {
 992                         $this->output( "...ll_lang is up-to-date.\n" );
 993                 }
 994         }
 995
 996         protected function doUserNewTalkTimestampNotNull() {
 997                 if ( !$this->doTable( 'user_newtalk' ) ) {
 998                         return true;
 999                 }
1000
1001                 $info = $this->db->fieldInfo( 'user_newtalk', 'user_last_timestamp' );
1002                 if ( $info === false ) {
1003                         return;
1004                 }
1005                 if ( $info->isNullable() ) {
1006                         $this->output( "...user_last_timestamp is already nullable.\n" );
1007
1008                         return;
1009                 }
1010
1011                 $this->applyPatch(
1012                         'patch-user-newtalk-timestamp-null.sql',
1013                         false,
1014                         'Making user_last_timestamp nullable'
1015                 );
1016         }
1017
1018         protected function doIwlinksIndexNonUnique() {
1019                 $info = $this->db->indexInfo( 'iwlinks', 'iwl_prefix_title_from' );
1020                 if ( is_array( $info ) && $info[0]->Non_unique ) {
1021                         $this->output( "...iwl_prefix_title_from index is already non-UNIQUE.\n" );
1022
1023                         return true;
1024                 }
1025                 if ( $this->skipSchema ) {
1026                         $this->output( "...skipping schema change (making iwl_prefix_title_from index non-UNIQUE).\n" );
1027
1028                         return false;
1029                 }
1030
1031                 return $this->applyPatch(
1032                         'patch-iwl_prefix_title_from-non-unique.sql',
1033                         false,
1034                         'Making iwl_prefix_title_from index non-UNIQUE'
1035                 );
1036         }
1037 }