src/Database/View.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2010-2022, the Friendica project
   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 Friendica\DI;
  25 use Friendica\Util\Writer\ViewDefinitionSqlWriter;
  26
  27 class View
  28 {
  29         /**
  30          * Creates a view
  31          *
  32          * @param bool $verbose Whether to show SQL statements
  33          * @param bool $action Whether to execute SQL statements
  34          * @return void
  35          */
  36         public static function create(bool $verbose, bool $action)
  37         {
  38                 // Delete previously used views that aren't used anymore
  39                 foreach (['post-view', 'post-thread-view'] as $view) {
  40                         if (self::isView($view)) {
  41                                 $sql = sprintf("DROP VIEW IF EXISTS `%s`", DBA::escape($view));
  42                                 if (!empty($sql) && $verbose) {
  43                                         echo $sql . ";\n";
  44                                 }
  45
  46                                 if (!empty($sql) && $action) {
  47                                         DBA::e($sql);
  48                                 }
  49                         }
  50                 }
  51
  52                 $definition = DI::viewDefinition()->getAll();
  53
  54                 foreach ($definition as $name => $structure) {
  55                         if (self::isView($name)) {
  56                                 DBA::e(sprintf("DROP VIEW IF EXISTS `%s`", DBA::escape($name)));
  57                         } elseif (self::isTable($name)) {
  58                                 DBA::e(sprintf("DROP TABLE IF EXISTS `%s`", DBA::escape($name)));
  59                         }
  60                         DBA::e(ViewDefinitionSqlWriter::createView($name, $structure));
  61                 }
  62         }
  63
  64         /**
  65          * Check if the given table/view is a view
  66          *
  67          * @param string $view
  68          * @return boolean "true" if it's a view
  69          */
  70         private static function isView(string $view): bool
  71         {
  72                 $status = DBA::selectFirst('INFORMATION_SCHEMA.TABLES', ['TABLE_TYPE'],
  73                         ['TABLE_SCHEMA' => DBA::databaseName(), 'TABLE_NAME' => $view]);
  74
  75                 if (empty($status['TABLE_TYPE'])) {
  76                         return false;
  77                 }
  78
  79                 return $status['TABLE_TYPE'] == 'VIEW';
  80         }
  81
  82         /**
  83          * Check if the given table/view is a table
  84          *
  85          * @param string $table
  86          * @return boolean "true" if it's a table
  87          */
  88         private static function isTable(string $table): bool
  89         {
  90                 $status = DBA::selectFirst('INFORMATION_SCHEMA.TABLES', ['TABLE_TYPE'],
  91                         ['TABLE_SCHEMA' => DBA::databaseName(), 'TABLE_NAME' => $table]);
  92
  93                 if (empty($status['TABLE_TYPE'])) {
  94                         return false;
  95                 }
  96
  97                 return $status['TABLE_TYPE'] == 'BASE TABLE';
  98         }
  99 }