src/Database/DBStructure.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2020, Friendica
   4  *
   5  * @license GNU AGPL version 3 or any later version
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as
   9  * published by the Free Software Foundation, either version 3 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 namespace Friendica\Database;
  23
  24 use Exception;
  25 use Friendica\Core\Hook;
  26 use Friendica\Core\Logger;
  27 use Friendica\DI;
  28 use Friendica\Model\Item;
  29 use Friendica\Model\User;
  30 use Friendica\Util\DateTimeFormat;
  31
  32 /**
  33  * This class contains functions that doesn't need to know if pdo, mysqli or whatever is used.
  34  */
  35 class DBStructure
  36 {
  37         const UPDATE_NOT_CHECKED = 0; // Database check wasn't executed before
  38         const UPDATE_SUCCESSFUL  = 1; // Database check was successful
  39         const UPDATE_FAILED      = 2; // Database check failed
  40
  41         const RENAME_COLUMN      = 0;
  42         const RENAME_PRIMARY_KEY = 1;
  43
  44         /**
  45          * Database structure definition loaded from config/dbstructure.config.php
  46          *
  47          * @var array
  48          */
  49         private static $definition = [];
  50
  51         /**
  52          * Set a database version to trigger update functions
  53          *
  54          * @param string $version
  55          * @return void
  56          */
  57         public static function setDatabaseVersion(string $version)
  58         {
  59                 if (!is_numeric($version)) {
  60                         throw new \Asika\SimpleConsole\CommandArgsException('The version number must be numeric');
  61                 }
  62
  63                 DI::config()->set('system', 'build', $version);
  64                 echo DI::l10n()->t('The database version had been set to %s.', $version);
  65         }
  66
  67         /**
  68          * Drop unused tables
  69          *
  70          * @param boolean $execute
  71          * @return void
  72          */
  73         public static function dropTables(bool $execute)
  74         {
  75                 $old_tables = ['fserver', 'gcign', 'gcontact', 'gcontact-relation', 'gfollower' ,'glink', 'item-delivery-data',
  76                 'item_id', 'poll', 'poll_result', 'queue', 'retriever_rule', 'sign', 'spam', 'term'];
  77
  78                 $tables = DBA::selectToArray(['INFORMATION_SCHEMA' => 'TABLES'], ['TABLE_NAME'],
  79                         ['TABLE_SCHEMA' => DBA::databaseName(), 'TABLE_TYPE' => 'BASE TABLE']);
  80
  81                 if (empty($tables)) {
  82                         echo DI::l10n()->t('No unused tables found.');
  83                         return;
  84                 }
  85
  86                 if (!$execute) {
  87                         echo DI::l10n()->t('These tables are not used for friendica and will be deleted when you execute "dbstructure drop -e":') . "\n\n";
  88                 }
  89
  90                 foreach ($tables as $table) {
  91                         if (in_array($table['TABLE_NAME'], $old_tables)) {
  92                                 if ($execute) {
  93                                         $sql = 'DROP TABLE ' . DBA::quoteIdentifier($table['TABLE_NAME']) . ';';
  94                                         echo $sql . "\n";
  95
  96                                         $result = DBA::e($sql);
  97                                         if (!DBA::isResult($result)) {
  98                                                 self::printUpdateError($sql);
  99                                         }
 100                                 } else {
 101                                         echo $table['TABLE_NAME'] . "\n";
 102                                 }
 103                         }
 104                 }
 105         }
 106
 107         /**
 108          * Converts all tables from MyISAM/InnoDB Antelope to InnoDB Barracuda
 109          */
 110         public static function convertToInnoDB()
 111         {
 112                 $tables = DBA::selectToArray(
 113                         ['information_schema' => 'tables'],
 114                         ['table_name'],
 115                         ['engine' => 'MyISAM', 'table_schema' => DBA::databaseName()]
 116                 );
 117
 118                 $tables = array_merge($tables, DBA::selectToArray(
 119                         ['information_schema' => 'tables'],
 120                         ['table_name'],
 121                         ['engine' => 'InnoDB', 'ROW_FORMAT' => ['COMPACT', 'REDUNDANT'], 'table_schema' => DBA::databaseName()]
 122                 ));
 123
 124                 if (!DBA::isResult($tables)) {
 125                         echo DI::l10n()->t('There are no tables on MyISAM or InnoDB with the Antelope file format.') . "\n";
 126                         return;
 127                 }
 128
 129                 foreach ($tables AS $table) {
 130                         $sql = "ALTER TABLE " . DBA::quoteIdentifier($table['table_name']) . " ENGINE=InnoDB ROW_FORMAT=DYNAMIC;";
 131                         echo $sql . "\n";
 132
 133                         $result = DBA::e($sql);
 134                         if (!DBA::isResult($result)) {
 135                                 self::printUpdateError($sql);
 136                         }
 137                 }
 138         }
 139
 140         /**
 141          * Print out database error messages
 142          *
 143          * @param string $message Message to be added to the error message
 144          *
 145          * @return string Error message
 146          */
 147         private static function printUpdateError($message)
 148         {
 149                 echo DI::l10n()->t("\nError %d occurred during database update:\n%s\n",
 150                         DBA::errorNo(), DBA::errorMessage());
 151
 152                 return DI::l10n()->t('Errors encountered performing database changes: ') . $message . EOL;
 153         }
 154
 155         public static function printStructure($basePath)
 156         {
 157                 $database = self::definition($basePath, false);
 158
 159                 echo "-- ------------------------------------------\n";
 160                 echo "-- " . FRIENDICA_PLATFORM . " " . FRIENDICA_VERSION . " (" . FRIENDICA_CODENAME, ")\n";
 161                 echo "-- DB_UPDATE_VERSION " . DB_UPDATE_VERSION . "\n";
 162                 echo "-- ------------------------------------------\n\n\n";
 163                 foreach ($database AS $name => $structure) {
 164                         echo "--\n";
 165                         echo "-- TABLE $name\n";
 166                         echo "--\n";
 167                         self::createTable($name, $structure, true, false);
 168
 169                         echo "\n";
 170                 }
 171
 172                 View::printStructure($basePath);
 173         }
 174
 175         /**
 176          * Loads the database structure definition from the static/dbstructure.config.php file.
 177          * On first pass, defines DB_UPDATE_VERSION constant.
 178          *
 179          * @see static/dbstructure.config.php
 180          * @param boolean $with_addons_structure Whether to tack on addons additional tables
 181          * @param string  $basePath              The base path of this application
 182          * @return array
 183          * @throws Exception
 184          */
 185         public static function definition($basePath, $with_addons_structure = true)
 186         {
 187                 if (!self::$definition) {
 188
 189                         $filename = $basePath . '/static/dbstructure.config.php';
 190
 191                         if (!is_readable($filename)) {
 192                                 throw new Exception('Missing database structure config file static/dbstructure.config.php');
 193                         }
 194
 195                         $definition = require $filename;
 196
 197                         if (!$definition) {
 198                                 throw new Exception('Corrupted database structure config file static/dbstructure.config.php');
 199                         }
 200
 201                         self::$definition = $definition;
 202                 } else {
 203                         $definition = self::$definition;
 204                 }
 205
 206                 if ($with_addons_structure) {
 207                         Hook::callAll('dbstructure_definition', $definition);
 208                 }
 209
 210                 return $definition;
 211         }
 212
 213         /**
 214          * Get field data for the given table
 215          *
 216          * @param string $table
 217          * @param array $data data fields
 218          * @return array fields for the given
 219          */
 220         public static function getFieldsForTable(string $table, array $data = [])
 221         {
 222                 $definition = DBStructure::definition('', false);
 223                 if (empty($definition[$table])) {
 224                         return [];
 225                 }
 226
 227                 $fieldnames = array_keys($definition[$table]['fields']);
 228
 229                 $fields = [];
 230
 231                 // Assign all field that are present in the table
 232                 foreach ($fieldnames as $field) {
 233                         if (isset($data[$field])) {
 234                                 $fields[$field] = $data[$field];
 235                         }
 236                 }
 237
 238                 return $fields;
 239         }
 240
 241         private static function createTable($name, $structure, $verbose, $action)
 242         {
 243                 $r = true;
 244
 245                 $engine = "";
 246                 $comment = "";
 247                 $sql_rows = [];
 248                 $primary_keys = [];
 249                 $foreign_keys = [];
 250
 251                 foreach ($structure["fields"] AS $fieldname => $field) {
 252                         $sql_rows[] = "`" . DBA::escape($fieldname) . "` " . self::FieldCommand($field);
 253                         if (!empty($field['primary'])) {
 254                                 $primary_keys[] = $fieldname;
 255                         }
 256                         if (!empty($field['foreign'])) {
 257                                 $foreign_keys[$fieldname] = $field;
 258                         }
 259                 }
 260
 261                 if (!empty($structure["indexes"])) {
 262                         foreach ($structure["indexes"] AS $indexname => $fieldnames) {
 263                                 $sql_index = self::createIndex($indexname, $fieldnames, "");
 264                                 if (!is_null($sql_index)) {
 265                                         $sql_rows[] = $sql_index;
 266                                 }
 267                         }
 268                 }
 269
 270                 foreach ($foreign_keys AS $fieldname => $parameters) {
 271                         $sql_rows[] = self::foreignCommand($name, $fieldname, $parameters);
 272                 }
 273
 274                 if (isset($structure["engine"])) {
 275                         $engine = " ENGINE=" . $structure["engine"];
 276                 }
 277
 278                 if (isset($structure["comment"])) {
 279                         $comment = " COMMENT='" . DBA::escape($structure["comment"]) . "'";
 280                 }
 281
 282                 $sql = implode(",\n\t", $sql_rows);
 283
 284                 $sql = sprintf("CREATE TABLE IF NOT EXISTS `%s` (\n\t", DBA::escape($name)) . $sql .
 285                         "\n)" . $engine . " DEFAULT COLLATE utf8mb4_general_ci" . $comment;
 286                 if ($verbose) {
 287                         echo $sql . ";\n";
 288                 }
 289
 290                 if ($action) {
 291                         $r = DBA::e($sql);
 292                 }
 293
 294                 return $r;
 295         }
 296
 297         private static function FieldCommand($parameters, $create = true)
 298         {
 299                 $fieldstruct = $parameters["type"];
 300
 301                 if (isset($parameters["Collation"])) {
 302                         $fieldstruct .= " COLLATE " . $parameters["Collation"];
 303                 }
 304
 305                 if (isset($parameters["not null"])) {
 306                         $fieldstruct .= " NOT NULL";
 307                 }
 308
 309                 if (isset($parameters["default"])) {
 310                         if (strpos(strtolower($parameters["type"]), "int") !== false) {
 311                                 $fieldstruct .= " DEFAULT " . $parameters["default"];
 312                         } else {
 313                                 $fieldstruct .= " DEFAULT '" . $parameters["default"] . "'";
 314                         }
 315                 }
 316                 if (isset($parameters["extra"])) {
 317                         $fieldstruct .= " " . $parameters["extra"];
 318                 }
 319
 320                 if (isset($parameters["comment"])) {
 321                         $fieldstruct .= " COMMENT '" . DBA::escape($parameters["comment"]) . "'";
 322                 }
 323
 324                 /*if (($parameters["primary"] != "") && $create)
 325                         $fieldstruct .= " PRIMARY KEY";*/
 326
 327                 return ($fieldstruct);
 328         }
 329
 330         private static function createIndex($indexname, $fieldnames, $method = "ADD")
 331         {
 332                 $method = strtoupper(trim($method));
 333                 if ($method != "" && $method != "ADD") {
 334                         throw new Exception("Invalid parameter 'method' in self::createIndex(): '$method'");
 335                 }
 336
 337                 if (in_array($fieldnames[0], ["UNIQUE", "FULLTEXT"])) {
 338                         $index_type = array_shift($fieldnames);
 339                         $method .= " " . $index_type;
 340                 }
 341
 342                 $names = "";
 343                 foreach ($fieldnames AS $fieldname) {
 344                         if ($names != "") {
 345                                 $names .= ",";
 346                         }
 347
 348                         if (preg_match('|(.+)\((\d+)\)|', $fieldname, $matches)) {
 349                                 $names .= "`" . DBA::escape($matches[1]) . "`(" . intval($matches[2]) . ")";
 350                         } else {
 351                                 $names .= "`" . DBA::escape($fieldname) . "`";
 352                         }
 353                 }
 354
 355                 if ($indexname == "PRIMARY") {
 356                         return sprintf("%s PRIMARY KEY(%s)", $method, $names);
 357                 }
 358
 359
 360                 $sql = sprintf("%s INDEX `%s` (%s)", $method, DBA::escape($indexname), $names);
 361                 return ($sql);
 362         }
 363
 364         /**
 365          * Updates DB structure and returns eventual errors messages
 366          *
 367          * @param string $basePath   The base path of this application
 368          * @param bool   $verbose
 369          * @param bool   $action     Whether to actually apply the update
 370          * @param bool   $install    Is this the initial update during the installation?
 371          * @param array  $tables     An array of the database tables
 372          * @param array  $definition An array of the definition tables
 373          * @return string Empty string if the update is successful, error messages otherwise
 374          * @throws Exception
 375          */
 376         public static function update($basePath, $verbose, $action, $install = false, array $tables = null, array $definition = null)
 377         {
 378                 $in_maintenance = DI::config()->get('system', 'maintenance');
 379
 380                 if ($action && !$install) {
 381                         if (self::isUpdating()) {
 382                                 return DI::l10n()->t('Another database update is currently running.');
 383                         }
 384
 385                         DI::config()->set('system', 'maintenance', 1);
 386                         DI::config()->set('system', 'maintenance_reason', DI::l10n()->t('%s: Database update', DateTimeFormat::utcNow() . ' ' . date('e')));
 387                 }
 388
 389                 // ensure that all initial values exist. This test has to be done prior and after the structure check.
 390                 // Prior is needed if the specific tables already exists - after is needed when they had been created.
 391                 self::checkInitialValues();
 392
 393                 $errors = '';
 394
 395                 Logger::info('updating structure');
 396
 397                 // Get the current structure
 398                 $database = [];
 399
 400                 if (is_null($tables)) {
 401                         $tables = DBA::toArray(DBA::p("SHOW TABLES"));
 402                 }
 403
 404                 if (DBA::isResult($tables)) {
 405                         foreach ($tables AS $table) {
 406                                 $table = current($table);
 407
 408                                 Logger::info('updating structure', ['table' => $table]);
 409                                 $database[$table] = self::tableStructure($table);
 410                         }
 411                 }
 412
 413                 // Get the definition
 414                 if (is_null($definition)) {
 415                         $definition = self::definition($basePath);
 416                 }
 417
 418                 // MySQL >= 5.7.4 doesn't support the IGNORE keyword in ALTER TABLE statements
 419                 if ((version_compare(DBA::serverInfo(), '5.7.4') >= 0) &&
 420                         !(strpos(DBA::serverInfo(), 'MariaDB') !== false)) {
 421                         $ignore = '';
 422                 } else {
 423                         $ignore = ' IGNORE';
 424                 }
 425
 426                 // Compare it
 427                 foreach ($definition AS $name => $structure) {
 428                         $is_new_table = false;
 429                         $group_by = "";
 430                         $sql3 = "";
 431                         $is_unique = false;
 432                         $temp_name = $name;
 433                         if (!isset($database[$name])) {
 434                                 $r = self::createTable($name, $structure, $verbose, $action);
 435                                 if (!DBA::isResult($r)) {
 436                                         $errors .= self::printUpdateError($name);
 437                                 }
 438                                 $is_new_table = true;
 439                         } else {
 440                                 foreach ($structure["indexes"] AS $indexname => $fieldnames) {
 441                                         if (isset($database[$name]["indexes"][$indexname])) {
 442                                                 $current_index_definition = implode(",", $database[$name]["indexes"][$indexname]);
 443                                         } else {
 444                                                 $current_index_definition = "__NOT_SET__";
 445                                         }
 446                                         $new_index_definition = implode(",", $fieldnames);
 447                                         if ($current_index_definition != $new_index_definition) {
 448                                                 if ($fieldnames[0] == "UNIQUE") {
 449                                                         $is_unique = true;
 450                                                         if ($ignore == "") {
 451                                                                 $temp_name = "temp-" . $name;
 452                                                         }
 453                                                 }
 454                                         }
 455                                 }
 456
 457                                 /*
 458                                  * Drop the index if it isn't present in the definition
 459                                  * or the definition differ from current status
 460                                  * and index name doesn't start with "local_"
 461                                  */
 462                                 foreach ($database[$name]["indexes"] as $indexname => $fieldnames) {
 463                                         $current_index_definition = implode(",", $fieldnames);
 464                                         if (isset($structure["indexes"][$indexname])) {
 465                                                 $new_index_definition = implode(",", $structure["indexes"][$indexname]);
 466                                         } else {
 467                                                 $new_index_definition = "__NOT_SET__";
 468                                         }
 469                                         if ($current_index_definition != $new_index_definition && substr($indexname, 0, 6) != 'local_') {
 470                                                 $sql2 = self::dropIndex($indexname);
 471                                                 if ($sql3 == "") {
 472                                                         $sql3 = "ALTER" . $ignore . " TABLE `" . $temp_name . "` " . $sql2;
 473                                                 } else {
 474                                                         $sql3 .= ", " . $sql2;
 475                                                 }
 476                                         }
 477                                 }
 478                                 // Compare the field structure field by field
 479                                 foreach ($structure["fields"] AS $fieldname => $parameters) {
 480                                         if (!isset($database[$name]["fields"][$fieldname])) {
 481                                                 $sql2 = self::addTableField($fieldname, $parameters);
 482                                                 if ($sql3 == "") {
 483                                                         $sql3 = "ALTER" . $ignore . " TABLE `" . $temp_name . "` " . $sql2;
 484                                                 } else {
 485                                                         $sql3 .= ", " . $sql2;
 486                                                 }
 487                                         } else {
 488                                                 // Compare the field definition
 489                                                 $field_definition = $database[$name]["fields"][$fieldname];
 490
 491                                                 // Remove the relation data that is used for the referential integrity
 492                                                 unset($parameters['relation']);
 493                                                 unset($parameters['foreign']);
 494
 495                                                 // We change the collation after the indexes had been changed.
 496                                                 // This is done to avoid index length problems.
 497                                                 // So here we always ensure that there is no need to change it.
 498                                                 unset($parameters['Collation']);
 499                                                 unset($field_definition['Collation']);
 500
 501                                                 // Only update the comment when it is defined
 502                                                 if (!isset($parameters['comment'])) {
 503                                                         $parameters['comment'] = "";
 504                                                 }
 505
 506                                                 $current_field_definition = DBA::cleanQuery(implode(",", $field_definition));
 507                                                 $new_field_definition = DBA::cleanQuery(implode(",", $parameters));
 508                                                 if ($current_field_definition != $new_field_definition) {
 509                                                         $sql2 = self::modifyTableField($fieldname, $parameters);
 510                                                         if ($sql3 == "") {
 511                                                                 $sql3 = "ALTER" . $ignore . " TABLE `" . $temp_name . "` " . $sql2;
 512                                                         } else {
 513                                                                 $sql3 .= ", " . $sql2;
 514                                                         }
 515                                                 }
 516                                         }
 517                                 }
 518                         }
 519
 520                         /*
 521                          * Create the index if the index don't exists in database
 522                          * or the definition differ from the current status.
 523                          * Don't create keys if table is new
 524                          */
 525                         if (!$is_new_table) {
 526                                 foreach ($structure["indexes"] AS $indexname => $fieldnames) {
 527                                         if (isset($database[$name]["indexes"][$indexname])) {
 528                                                 $current_index_definition = implode(",", $database[$name]["indexes"][$indexname]);
 529                                         } else {
 530                                                 $current_index_definition = "__NOT_SET__";
 531                                         }
 532                                         $new_index_definition = implode(",", $fieldnames);
 533                                         if ($current_index_definition != $new_index_definition) {
 534                                                 $sql2 = self::createIndex($indexname, $fieldnames);
 535
 536                                                 // Fetch the "group by" fields for unique indexes
 537                                                 $group_by = self::groupBy($fieldnames);
 538                                                 if ($sql2 != "") {
 539                                                         if ($sql3 == "") {
 540                                                                 $sql3 = "ALTER" . $ignore . " TABLE `" . $temp_name . "` " . $sql2;
 541                                                         } else {
 542                                                                 $sql3 .= ", " . $sql2;
 543                                                         }
 544                                                 }
 545                                         }
 546                                 }
 547
 548                                 $existing_foreign_keys = $database[$name]['foreign_keys'];
 549
 550                                 // Foreign keys
 551                                 // Compare the field structure field by field
 552                                 foreach ($structure["fields"] AS $fieldname => $parameters) {
 553                                         if (empty($parameters['foreign'])) {
 554                                                 continue;
 555                                         }
 556
 557                                         $constraint = self::getConstraintName($name, $fieldname, $parameters);
 558
 559                                         unset($existing_foreign_keys[$constraint]);
 560
 561                                         if (empty($database[$name]['foreign_keys'][$constraint])) {
 562                                                 $sql2 = self::addForeignKey($name, $fieldname, $parameters);
 563
 564                                                 if ($sql3 == "") {
 565                                                         $sql3 = "ALTER" . $ignore . " TABLE `" . $temp_name . "` " . $sql2;
 566                                                 } else {
 567                                                         $sql3 .= ", " . $sql2;
 568                                                 }
 569                                         }
 570                                 }
 571
 572                                 foreach ($existing_foreign_keys as $param) {
 573                                         $sql2 = self::dropForeignKey($param['CONSTRAINT_NAME']);
 574
 575                                         if ($sql3 == "") {
 576                                                 $sql3 = "ALTER" . $ignore . " TABLE `" . $temp_name . "` " . $sql2;
 577                                         } else {
 578                                                 $sql3 .= ", " . $sql2;
 579                                         }
 580                                 }
 581
 582                                 if (isset($database[$name]["table_status"]["TABLE_COMMENT"])) {
 583                                         $structurecomment = $structure["comment"] ?? '';
 584                                         if ($database[$name]["table_status"]["TABLE_COMMENT"] != $structurecomment) {
 585                                                 $sql2 = "COMMENT = '" . DBA::escape($structurecomment) . "'";
 586
 587                                                 if ($sql3 == "") {
 588                                                         $sql3 = "ALTER" . $ignore . " TABLE `" . $temp_name . "` " . $sql2;
 589                                                 } else {
 590                                                         $sql3 .= ", " . $sql2;
 591                                                 }
 592                                         }
 593                                 }
 594
 595                                 if (isset($database[$name]["table_status"]["ENGINE"]) && isset($structure['engine'])) {
 596                                         if ($database[$name]["table_status"]["ENGINE"] != $structure['engine']) {
 597                                                 $sql2 = "ENGINE = '" . DBA::escape($structure['engine']) . "'";
 598
 599                                                 if ($sql3 == "") {
 600                                                         $sql3 = "ALTER" . $ignore . " TABLE `" . $temp_name . "` " . $sql2;
 601                                                 } else {
 602                                                         $sql3 .= ", " . $sql2;
 603                                                 }
 604                                         }
 605                                 }
 606
 607                                 if (isset($database[$name]["table_status"]["TABLE_COLLATION"])) {
 608                                         if ($database[$name]["table_status"]["TABLE_COLLATION"] != 'utf8mb4_general_ci') {
 609                                                 $sql2 = "DEFAULT COLLATE utf8mb4_general_ci";
 610
 611                                                 if ($sql3 == "") {
 612                                                         $sql3 = "ALTER" . $ignore . " TABLE `" . $temp_name . "` " . $sql2;
 613                                                 } else {
 614                                                         $sql3 .= ", " . $sql2;
 615                                                 }
 616                                         }
 617                                 }
 618
 619                                 if ($sql3 != "") {
 620                                         $sql3 .= "; ";
 621                                 }
 622
 623                                 // Now have a look at the field collations
 624                                 // Compare the field structure field by field
 625                                 foreach ($structure["fields"] AS $fieldname => $parameters) {
 626                                         // Compare the field definition
 627                                         $field_definition = ($database[$name]["fields"][$fieldname] ?? '') ?: ['Collation' => ''];
 628
 629                                         // Define the default collation if not given
 630                                         if (!isset($parameters['Collation']) && !empty($field_definition['Collation'])) {
 631                                                 $parameters['Collation'] = 'utf8mb4_general_ci';
 632                                         } else {
 633                                                 $parameters['Collation'] = null;
 634                                         }
 635
 636                                         if ($field_definition['Collation'] != $parameters['Collation']) {
 637                                                 $sql2 = self::modifyTableField($fieldname, $parameters);
 638                                                 if (($sql3 == "") || (substr($sql3, -2, 2) == "; ")) {
 639                                                         $sql3 .= "ALTER" . $ignore . " TABLE `" . $temp_name . "` " . $sql2;
 640                                                 } else {
 641                                                         $sql3 .= ", " . $sql2;
 642                                                 }
 643                                         }
 644                                 }
 645                         }
 646
 647                         if ($sql3 != "") {
 648                                 if (substr($sql3, -2, 2) != "; ") {
 649                                         $sql3 .= ";";
 650                                 }
 651
 652                                 $field_list = '';
 653                                 if ($is_unique && $ignore == '') {
 654                                         foreach ($database[$name]["fields"] AS $fieldname => $parameters) {
 655                                                 $field_list .= 'ANY_VALUE(`' . $fieldname . '`),';
 656                                         }
 657                                         $field_list = rtrim($field_list, ',');
 658                                 }
 659
 660                                 if ($verbose) {
 661                                         // Ensure index conversion to unique removes duplicates
 662                                         if ($is_unique && ($temp_name != $name)) {
 663                                                 if ($ignore != "") {
 664                                                         echo "SET session old_alter_table=1;\n";
 665                                                 } else {
 666                                                         echo "DROP TABLE IF EXISTS `" . $temp_name . "`;\n";
 667                                                         echo "CREATE TABLE `" . $temp_name . "` LIKE `" . $name . "`;\n";
 668                                                 }
 669                                         }
 670
 671                                         echo $sql3 . "\n";
 672
 673                                         if ($is_unique && ($temp_name != $name)) {
 674                                                 if ($ignore != "") {
 675                                                         echo "SET session old_alter_table=0;\n";
 676                                                 } else {
 677                                                         echo "INSERT INTO `" . $temp_name . "` SELECT " . DBA::anyValueFallback($field_list) . " FROM `" . $name . "`" . $group_by . ";\n";
 678                                                         echo "DROP TABLE `" . $name . "`;\n";
 679                                                         echo "RENAME TABLE `" . $temp_name . "` TO `" . $name . "`;\n";
 680                                                 }
 681                                         }
 682                                 }
 683
 684                                 if ($action) {
 685                                         if (!$install) {
 686                                                 DI::config()->set('system', 'maintenance_reason', DI::l10n()->t('%s: updating %s table.', DateTimeFormat::utcNow() . ' ' . date('e'), $name));
 687                                         }
 688
 689                                         // Ensure index conversion to unique removes duplicates
 690                                         if ($is_unique && ($temp_name != $name)) {
 691                                                 if ($ignore != "") {
 692                                                         DBA::e("SET session old_alter_table=1;");
 693                                                 } else {
 694                                                         $r = DBA::e("DROP TABLE IF EXISTS `" . $temp_name . "`;");
 695                                                         if (!DBA::isResult($r)) {
 696                                                                 $errors .= self::printUpdateError($sql3);
 697                                                                 return $errors;
 698                                                         }
 699
 700                                                         $r = DBA::e("CREATE TABLE `" . $temp_name . "` LIKE `" . $name . "`;");
 701                                                         if (!DBA::isResult($r)) {
 702                                                                 $errors .= self::printUpdateError($sql3);
 703                                                                 return $errors;
 704                                                         }
 705                                                 }
 706                                         }
 707
 708                                         $r = DBA::e($sql3);
 709                                         if (!DBA::isResult($r)) {
 710                                                 $errors .= self::printUpdateError($sql3);
 711                                         }
 712                                         if ($is_unique && ($temp_name != $name)) {
 713                                                 if ($ignore != "") {
 714                                                         DBA::e("SET session old_alter_table=0;");
 715                                                 } else {
 716                                                         $r = DBA::e("INSERT INTO `" . $temp_name . "` SELECT " . $field_list . " FROM `" . $name . "`" . $group_by . ";");
 717                                                         if (!DBA::isResult($r)) {
 718                                                                 $errors .= self::printUpdateError($sql3);
 719                                                                 return $errors;
 720                                                         }
 721                                                         $r = DBA::e("DROP TABLE `" . $name . "`;");
 722                                                         if (!DBA::isResult($r)) {
 723                                                                 $errors .= self::printUpdateError($sql3);
 724                                                                 return $errors;
 725                                                         }
 726                                                         $r = DBA::e("RENAME TABLE `" . $temp_name . "` TO `" . $name . "`;");
 727                                                         if (!DBA::isResult($r)) {
 728                                                                 $errors .= self::printUpdateError($sql3);
 729                                                                 return $errors;
 730                                                         }
 731                                                 }
 732                                         }
 733                                 }
 734                         }
 735                 }
 736
 737                 View::create(false, $action);
 738
 739                 self::checkInitialValues();
 740
 741                 if ($action && !$install) {
 742                         if (!$in_maintenance) {
 743                                 DI::config()->set('system', 'maintenance', 0);
 744                                 DI::config()->set('system', 'maintenance_reason', '');
 745                         }
 746
 747                         if ($errors) {
 748                                 DI::config()->set('system', 'dbupdate', self::UPDATE_FAILED);
 749                         } else {
 750                                 DI::config()->set('system', 'dbupdate', self::UPDATE_SUCCESSFUL);
 751                         }
 752                 }
 753
 754                 return $errors;
 755         }
 756
 757         private static function tableStructure($table)
 758         {
 759                 // This query doesn't seem to be executable as a prepared statement
 760                 $indexes = DBA::toArray(DBA::p("SHOW INDEX FROM " . DBA::quoteIdentifier($table)));
 761
 762                 $fields = DBA::selectToArray(['INFORMATION_SCHEMA' => 'COLUMNS'],
 763                         ['COLUMN_NAME', 'COLUMN_TYPE', 'IS_NULLABLE', 'COLUMN_DEFAULT', 'EXTRA',
 764                         'COLUMN_KEY', 'COLLATION_NAME', 'COLUMN_COMMENT'],
 765                         ["`TABLE_SCHEMA` = ? AND `TABLE_NAME` = ?",
 766                         DBA::databaseName(), $table]);
 767
 768                 $foreign_keys = DBA::selectToArray(['INFORMATION_SCHEMA' => 'KEY_COLUMN_USAGE'],
 769                         ['COLUMN_NAME', 'CONSTRAINT_NAME', 'REFERENCED_TABLE_NAME', 'REFERENCED_COLUMN_NAME'],
 770                         ["`TABLE_SCHEMA` = ? AND `TABLE_NAME` = ? AND `REFERENCED_TABLE_SCHEMA` IS NOT NULL",
 771                         DBA::databaseName(), $table]);
 772
 773                 $table_status = DBA::selectFirst(['INFORMATION_SCHEMA' => 'TABLES'],
 774                         ['ENGINE', 'TABLE_COLLATION', 'TABLE_COMMENT'],
 775                         ["`TABLE_SCHEMA` = ? AND `TABLE_NAME` = ?",
 776                         DBA::databaseName(), $table]);
 777
 778                 $fielddata = [];
 779                 $indexdata = [];
 780                 $foreigndata = [];
 781
 782                 if (DBA::isResult($foreign_keys)) {
 783                         foreach ($foreign_keys as $foreign_key) {
 784                                 $parameters = ['foreign' => [$foreign_key['REFERENCED_TABLE_NAME'] => $foreign_key['REFERENCED_COLUMN_NAME']]];
 785                                 $constraint = self::getConstraintName($table, $foreign_key['COLUMN_NAME'], $parameters);
 786                                 $foreigndata[$constraint] = $foreign_key;
 787                         }
 788                 }
 789
 790                 if (DBA::isResult($indexes)) {
 791                         foreach ($indexes AS $index) {
 792                                 if ($index["Key_name"] != "PRIMARY" && $index["Non_unique"] == "0" && !isset($indexdata[$index["Key_name"]])) {
 793                                         $indexdata[$index["Key_name"]] = ["UNIQUE"];
 794                                 }
 795
 796                                 if ($index["Index_type"] == "FULLTEXT" && !isset($indexdata[$index["Key_name"]])) {
 797                                         $indexdata[$index["Key_name"]] = ["FULLTEXT"];
 798                                 }
 799
 800                                 $column = $index["Column_name"];
 801
 802                                 if ($index["Sub_part"] != "") {
 803                                         $column .= "(" . $index["Sub_part"] . ")";
 804                                 }
 805
 806                                 $indexdata[$index["Key_name"]][] = $column;
 807                         }
 808                 }
 809
 810                 $fielddata = [];
 811                 if (DBA::isResult($fields)) {
 812                         foreach ($fields AS $field) {
 813                                 $search = ['tinyint(1)', 'tinyint(3) unsigned', 'tinyint(4)', 'smallint(5) unsigned', 'smallint(6)', 'mediumint(8) unsigned', 'mediumint(9)', 'bigint(20)', 'int(10) unsigned', 'int(11)'];
 814                                 $replace = ['boolean', 'tinyint unsigned', 'tinyint', 'smallint unsigned', 'smallint', 'mediumint unsigned', 'mediumint', 'bigint', 'int unsigned', 'int'];
 815                                 $field['COLUMN_TYPE'] = str_replace($search, $replace, $field['COLUMN_TYPE']);
 816
 817                                 $fielddata[$field['COLUMN_NAME']]['type'] = $field['COLUMN_TYPE'];
 818
 819                                 if ($field['IS_NULLABLE'] == 'NO') {
 820                                         $fielddata[$field['COLUMN_NAME']]['not null'] = true;
 821                                 }
 822
 823                                 if (isset($field['COLUMN_DEFAULT']) && ($field['COLUMN_DEFAULT'] != 'NULL')) {
 824                                         $fielddata[$field['COLUMN_NAME']]['default'] = trim($field['COLUMN_DEFAULT'], "'");
 825                                 }
 826
 827                                 if (!empty($field['EXTRA'])) {
 828                                         $fielddata[$field['COLUMN_NAME']]['extra'] = $field['EXTRA'];
 829                                 }
 830
 831                                 if ($field['COLUMN_KEY'] == 'PRI') {
 832                                         $fielddata[$field['COLUMN_NAME']]['primary'] = true;
 833                                 }
 834
 835                                 $fielddata[$field['COLUMN_NAME']]['Collation'] = $field['COLLATION_NAME'];
 836                                 $fielddata[$field['COLUMN_NAME']]['comment'] = $field['COLUMN_COMMENT'];
 837                         }
 838                 }
 839
 840                 return ["fields" => $fielddata, "indexes" => $indexdata,
 841                         "foreign_keys" => $foreigndata, "table_status" => $table_status];
 842         }
 843
 844         private static function dropIndex($indexname)
 845         {
 846                 $sql = sprintf("DROP INDEX `%s`", DBA::escape($indexname));
 847                 return ($sql);
 848         }
 849
 850         private static function addTableField($fieldname, $parameters)
 851         {
 852                 $sql = sprintf("ADD `%s` %s", DBA::escape($fieldname), self::FieldCommand($parameters));
 853                 return ($sql);
 854         }
 855
 856         private static function modifyTableField($fieldname, $parameters)
 857         {
 858                 $sql = sprintf("MODIFY `%s` %s", DBA::escape($fieldname), self::FieldCommand($parameters, false));
 859                 return ($sql);
 860         }
 861
 862         private static function getConstraintName(string $tablename, string $fieldname, array $parameters)
 863         {
 864                 $foreign_table = array_keys($parameters['foreign'])[0];
 865                 $foreign_field = array_values($parameters['foreign'])[0];
 866
 867                 return $tablename . "-" . $fieldname. "-" . $foreign_table. "-" . $foreign_field;
 868         }
 869
 870         private static function foreignCommand(string $tablename, string $fieldname, array $parameters) {
 871                 $foreign_table = array_keys($parameters['foreign'])[0];
 872                 $foreign_field = array_values($parameters['foreign'])[0];
 873
 874                 $sql = "FOREIGN KEY (`" . $fieldname . "`) REFERENCES `" . $foreign_table . "` (`" . $foreign_field . "`)";
 875
 876                 if (!empty($parameters['foreign']['on update'])) {
 877                         $sql .= " ON UPDATE " . strtoupper($parameters['foreign']['on update']);
 878                 } else {
 879                         $sql .= " ON UPDATE RESTRICT";
 880                 }
 881
 882                 if (!empty($parameters['foreign']['on delete'])) {
 883                         $sql .= " ON DELETE " . strtoupper($parameters['foreign']['on delete']);
 884                 } else {
 885                         $sql .= " ON DELETE CASCADE";
 886                 }
 887
 888                 return $sql;
 889         }
 890
 891         private static function addForeignKey(string $tablename, string $fieldname, array $parameters)
 892         {
 893                 return sprintf("ADD %s", self::foreignCommand($tablename, $fieldname, $parameters));
 894         }
 895
 896         private static function dropForeignKey(string $constraint)
 897         {
 898                 return sprintf("DROP FOREIGN KEY `%s`", $constraint);
 899         }
 900
 901         /**
 902          * Constructs a GROUP BY clause from a UNIQUE index definition.
 903          *
 904          * @param array $fieldnames
 905          * @return string
 906          */
 907         private static function groupBy(array $fieldnames)
 908         {
 909                 if ($fieldnames[0] != "UNIQUE") {
 910                         return "";
 911                 }
 912
 913                 array_shift($fieldnames);
 914
 915                 $names = "";
 916                 foreach ($fieldnames AS $fieldname) {
 917                         if ($names != "") {
 918                                 $names .= ",";
 919                         }
 920
 921                         if (preg_match('|(.+)\((\d+)\)|', $fieldname, $matches)) {
 922                                 $names .= "`" . DBA::escape($matches[1]) . "`";
 923                         } else {
 924                                 $names .= "`" . DBA::escape($fieldname) . "`";
 925                         }
 926                 }
 927
 928                 $sql = sprintf(" GROUP BY %s", $names);
 929                 return $sql;
 930         }
 931
 932         /**
 933          * Renames columns or the primary key of a table
 934          *
 935          * @todo You cannot rename a primary key if "auto increment" is set
 936          *
 937          * @param string $table            Table name
 938          * @param array  $columns          Columns Syntax for Rename: [ $old1 => [ $new1, $type1 ], $old2 => [ $new2, $type2 ], ... ]
 939          *                                 Syntax for Primary Key: [ $col1, $col2, ...]
 940          * @param int    $type             The type of renaming (Default is Column)
 941          *
 942          * @return boolean Was the renaming successful?
 943          * @throws Exception
 944          */
 945         public static function rename($table, $columns, $type = self::RENAME_COLUMN)
 946         {
 947                 if (empty($table) || empty($columns)) {
 948                         return false;
 949                 }
 950
 951                 if (!is_array($columns)) {
 952                         return false;
 953                 }
 954
 955                 $table = DBA::escape($table);
 956
 957                 $sql = "ALTER TABLE `" . $table . "`";
 958                 switch ($type) {
 959                         case self::RENAME_COLUMN:
 960                                 if (!self::existsColumn($table, array_keys($columns))) {
 961                                         return false;
 962                                 }
 963                                 $sql .= implode(',', array_map(
 964                                         function ($to, $from) {
 965                                                 return " CHANGE `" . $from . "` `" . $to[0] . "` " . $to[1];
 966                                         },
 967                                         $columns,
 968                                         array_keys($columns)
 969                                 ));
 970                                 break;
 971                         case self::RENAME_PRIMARY_KEY:
 972                                 if (!self::existsColumn($table, $columns)) {
 973                                         return false;
 974                                 }
 975                                 $sql .= " DROP PRIMARY KEY, ADD PRIMARY KEY(`" . implode('`, `', $columns) . "`)";
 976                                 break;
 977                         default:
 978                                 return false;
 979                 }
 980
 981                 $sql .= ";";
 982
 983                 $stmt = DBA::p($sql);
 984
 985                 if (is_bool($stmt)) {
 986                         $retval = $stmt;
 987                 } else {
 988                         $retval = true;
 989                 }
 990
 991                 DBA::close($stmt);
 992
 993                 return $retval;
 994         }
 995
 996         /**
 997          *    Check if the columns of the table exists
 998          *
 999          * @param string $table   Table name
1000          * @param array  $columns Columns to check ( Syntax: [ $col1, $col2, .. ] )
1001          *
1002          * @return boolean Does the table exist?
1003          * @throws Exception
1004          */
1005         public static function existsColumn($table, $columns = [])
1006         {
1007                 if (empty($table)) {
1008                         return false;
1009                 }
1010
1011                 if (is_null($columns) || empty($columns)) {
1012                         return self::existsTable($table);
1013                 }
1014
1015                 $table = DBA::escape($table);
1016
1017                 foreach ($columns AS $column) {
1018                         $sql = "SHOW COLUMNS FROM `" . $table . "` LIKE '" . $column . "';";
1019
1020                         $stmt = DBA::p($sql);
1021
1022                         if (is_bool($stmt)) {
1023                                 $retval = $stmt;
1024                         } else {
1025                                 $retval = (DBA::numRows($stmt) > 0);
1026                         }
1027
1028                         DBA::close($stmt);
1029
1030                         if (!$retval) {
1031                                 return false;
1032                         }
1033                 }
1034
1035                 return true;
1036         }
1037
1038         /**
1039          * Check if a foreign key exists for the given table field
1040          *
1041          * @param string $table
1042          * @param string $field
1043          * @return boolean
1044          */
1045         public static function existsForeignKeyForField(string $table, string $field)
1046         {
1047                 return DBA::exists(['INFORMATION_SCHEMA' => 'KEY_COLUMN_USAGE'],
1048                         ["`TABLE_SCHEMA` = ? AND `TABLE_NAME` = ? AND `COLUMN_NAME` = ? AND `REFERENCED_TABLE_SCHEMA` IS NOT NULL",
1049                         DBA::databaseName(), $table, $field]);
1050         }
1051         /**
1052          *    Check if a table exists
1053          *
1054          * @param string|array $table Table name
1055          *
1056          * @return boolean Does the table exist?
1057          * @throws Exception
1058          */
1059         public static function existsTable($table)
1060         {
1061                 if (empty($table)) {
1062                         return false;
1063                 }
1064
1065                 if (is_array($table)) {
1066                         $condition = ['table_schema' => key($table), 'table_name' => current($table)];
1067                 } else {
1068                         $condition = ['table_schema' => DBA::databaseName(), 'table_name' => $table];
1069                 }
1070
1071                 $result = DBA::exists(['information_schema' => 'tables'], $condition);
1072
1073                 return $result;
1074         }
1075
1076         /**
1077          * Returns the columns of a table
1078          *
1079          * @param string $table Table name
1080          *
1081          * @return array An array of the table columns
1082          * @throws Exception
1083          */
1084         public static function getColumns($table)
1085         {
1086                 $stmtColumns = DBA::p("SHOW COLUMNS FROM `" . $table . "`");
1087                 return DBA::toArray($stmtColumns);
1088         }
1089
1090         /**
1091          * Check if initial database values do exist - or create them
1092          */
1093         public static function checkInitialValues(bool $verbose = false)
1094         {
1095                 if (self::existsTable('verb')) {
1096                         if (!DBA::exists('verb', ['id' => 1])) {
1097                                 foreach (Item::ACTIVITIES as $index => $activity) {
1098                                         DBA::insert('verb', ['id' => $index + 1, 'name' => $activity], Database::INSERT_IGNORE);
1099                                 }
1100                                 if ($verbose) {
1101                                         echo "verb: activities added\n";
1102                                 }
1103                         } elseif ($verbose) {
1104                                 echo "verb: activities already added\n";
1105                         }
1106
1107                         if (!DBA::exists('verb', ['id' => 0])) {
1108                                 DBA::insert('verb', ['name' => '']);
1109                                 $lastid = DBA::lastInsertId();
1110                                 if ($lastid != 0) {
1111                                         DBA::update('verb', ['id' => 0], ['id' => $lastid]);
1112                                         if ($verbose) {
1113                                                 echo "Zero verb added\n";
1114                                         }
1115                                 }
1116                         } elseif ($verbose) {
1117                                 echo "Zero verb already added\n";
1118                         }
1119                 } elseif ($verbose) {
1120                         echo "verb: Table not found\n";
1121                 }
1122
1123                 if (self::existsTable('user') && !DBA::exists('user', ['uid' => 0])) {
1124                         $user = [
1125                                 "verified" => true,
1126                                 "page-flags" => User::PAGE_FLAGS_SOAPBOX,
1127                                 "account-type" => User::ACCOUNT_TYPE_RELAY,
1128                         ];
1129                         DBA::insert('user', $user);
1130                         $lastid = DBA::lastInsertId();
1131                         if ($lastid != 0) {
1132                                 DBA::update('user', ['uid' => 0], ['uid' => $lastid]);
1133                                 if ($verbose) {
1134                                         echo "Zero user added\n";
1135                                 }
1136                         }
1137                 } elseif (self::existsTable('user') && $verbose) {
1138                         echo "Zero user already added\n";
1139                 } elseif ($verbose) {
1140                         echo "user: Table not found\n";
1141                 }
1142
1143                 if (self::existsTable('contact') && !DBA::exists('contact', ['id' => 0])) {
1144                         DBA::insert('contact', ['nurl' => '']);
1145                         $lastid = DBA::lastInsertId();
1146                         if ($lastid != 0) {
1147                                 DBA::update('contact', ['id' => 0], ['id' => $lastid]);
1148                                 if ($verbose) {
1149                                         echo "Zero contact added\n";
1150                                 }
1151                         }
1152                 } elseif (self::existsTable('contact') && $verbose) {
1153                         echo "Zero contact already added\n";
1154                 } elseif ($verbose) {
1155                         echo "contact: Table not found\n";
1156                 }
1157
1158                 if (self::existsTable('tag') && !DBA::exists('tag', ['id' => 0])) {
1159                         DBA::insert('tag', ['name' => '']);
1160                         $lastid = DBA::lastInsertId();
1161                         if ($lastid != 0) {
1162                                 DBA::update('tag', ['id' => 0], ['id' => $lastid]);
1163                                 if ($verbose) {
1164                                         echo "Zero tag added\n";
1165                                 }
1166                         }
1167                 } elseif (self::existsTable('tag') && $verbose) {
1168                         echo "Zero tag already added\n";
1169                 } elseif ($verbose) {
1170                         echo "tag: Table not found\n";
1171                 }
1172
1173                 if (self::existsTable('permissionset')) {
1174                         if (!DBA::exists('permissionset', ['id' => 0])) {
1175                                 DBA::insert('permissionset', ['allow_cid' => '', 'allow_gid' => '', 'deny_cid' => '', 'deny_gid' => '']);
1176                                 $lastid = DBA::lastInsertId();
1177                                 if ($lastid != 0) {
1178                                         DBA::update('permissionset', ['id' => 0], ['id' => $lastid]);
1179                                         if ($verbose) {
1180                                                 echo "Zero permissionset added\n";
1181                                         }
1182                                 }
1183                         } elseif ($verbose) {
1184                                 echo "Zero permissionset already added\n";
1185                         }
1186                         if (!self::existsForeignKeyForField('item', 'psid')) {
1187                                 $sets = DBA::p("SELECT `psid`, `item`.`uid`, `item`.`private` FROM `item`
1188                                         LEFT JOIN `permissionset` ON `permissionset`.`id` = `item`.`psid`
1189                                         WHERE `permissionset`.`id` IS NULL AND NOT `psid` IS NULL");
1190                                 while ($set = DBA::fetch($sets)) {
1191                                         if (($set['private'] == Item::PRIVATE) && ($set['uid'] != 0)) {
1192                                                 $owner = User::getOwnerDataById($set['uid']);
1193                                                 if ($owner) {
1194                                                         $permission = '<' . $owner['id'] . '>';
1195                                                 } else {
1196                                                         $permission = '<>';
1197                                                 }
1198                                         } else {
1199                                                 $permission = '';
1200                                         }
1201                                         $fields = ['id' => $set['psid'], 'uid' => $set['uid'], 'allow_cid' => $permission,
1202                                                 'allow_gid' => '', 'deny_cid' => '', 'deny_gid' => ''];
1203                                         DBA::insert('permissionset', $fields);
1204                                 }
1205                                 DBA::close($sets);
1206                         }
1207                 } elseif ($verbose) {
1208                         echo "permissionset: Table not found\n";
1209                 }
1210
1211                 if (!self::existsForeignKeyForField('tokens', 'client_id')) {
1212                         $tokens = DBA::p("SELECT `tokens`.`id` FROM `tokens`
1213                                 LEFT JOIN `clients` ON `clients`.`client_id` = `tokens`.`client_id`
1214                                 WHERE `clients`.`client_id` IS NULL");
1215                         while ($token = DBA::fetch($tokens)) {
1216                                 DBA::delete('tokens', ['id' => $token['id']]);
1217                         }
1218                         DBA::close($tokens);
1219                 }
1220         }
1221
1222         /**
1223          * Checks if a database update is currently running
1224          *
1225          * @return boolean
1226          */
1227         private static function isUpdating()
1228         {
1229                 $isUpdate = false;
1230
1231                 $processes = DBA::select(['information_schema' => 'processlist'], ['info'],
1232                         ['db' => DBA::databaseName(), 'command' => ['Query', 'Execute']]);
1233
1234                 while ($process = DBA::fetch($processes)) {
1235                         $parts = explode(' ', $process['info']);
1236                         if (in_array(strtolower(array_shift($parts)), ['alter', 'create', 'drop', 'rename'])) {
1237                                 $isUpdate = true;
1238                         }
1239                 }
1240
1241                 DBA::close($processes);
1242
1243                 return $isUpdate;
1244         }
1245 }