maintenance/sqlite.php

   1 <?php
   2 /**
   3  * Performs some operations specific to SQLite database backend.
   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 Maintenance
  22  */
  23
  24 require_once __DIR__ . '/Maintenance.php';
  25
  26 /**
  27  * Maintenance script that performs some operations specific to SQLite database backend.
  28  *
  29  * @ingroup Maintenance
  30  */
  31 class SqliteMaintenance extends Maintenance {
  32         public function __construct() {
  33                 parent::__construct();
  34                 $this->mDescription = "Performs some operations specific to SQLite database backend";
  35                 $this->addOption( 'vacuum', 'Clean up database by removing deleted pages. Decreases database file size' );
  36                 $this->addOption( 'integrity', 'Check database for integrity' );
  37                 $this->addOption( 'backup-to', 'Backup database to the given file', false, true );
  38                 $this->addOption( 'check-syntax', 'Check SQL file(s) for syntax errors', false, true );
  39         }
  40
  41         /**
  42          * While we use database connection, this simple lie prevents useless --dbpass and
  43          * --dbuser options from appearing in help message for this script.
  44          *
  45          * @return int DB constant
  46          */
  47         public function getDbType() {
  48                 return Maintenance::DB_NONE;
  49         }
  50
  51         public function execute() {
  52                 // Should work even if we use a non-SQLite database
  53                 if ( $this->hasOption( 'check-syntax' ) ) {
  54                         $this->checkSyntax();
  55                         return;
  56                 }
  57
  58                 $this->db = wfGetDB( DB_MASTER );
  59
  60                 if ( $this->db->getType() != 'sqlite' ) {
  61                         $this->error( "This maintenance script requires a SQLite database.\n" );
  62                         return;
  63                 }
  64
  65                 if ( $this->hasOption( 'vacuum' ) ) {
  66                         $this->vacuum();
  67                 }
  68
  69                 if ( $this->hasOption( 'integrity' ) ) {
  70                         $this->integrityCheck();
  71                 }
  72
  73                 if ( $this->hasOption( 'backup-to' ) ) {
  74                         $this->backup( $this->getOption( 'backup-to' ) );
  75                 }
  76         }
  77
  78         private function vacuum() {
  79                 $prevSize = filesize( $this->db->mDatabaseFile );
  80                 if ( $prevSize == 0 ) {
  81                         $this->error( "Can't vacuum an empty database.\n", true );
  82                 }
  83
  84                 $this->output( 'VACUUM: ' );
  85                 if ( $this->db->query( 'VACUUM' ) ) {
  86                         clearstatcache();
  87                         $newSize = filesize( $this->db->mDatabaseFile );
  88                         $this->output( sprintf( "Database size was %d, now %d (%.1f%% reduction).\n",
  89                                 $prevSize, $newSize, ( $prevSize - $newSize ) * 100.0 / $prevSize ) );
  90                 } else {
  91                         $this->output( 'Error\n' );
  92                 }
  93         }
  94
  95         private function integrityCheck() {
  96                 $this->output( "Performing database integrity checks:\n" );
  97                 $res = $this->db->query( 'PRAGMA integrity_check' );
  98
  99                 if ( !$res || $res->numRows() == 0 ) {
 100                         $this->error( "Error: integrity check query returned nothing.\n" );
 101                         return;
 102                 }
 103
 104                 foreach ( $res as $row ) {
 105                         $this->output( $row->integrity_check );
 106                 }
 107         }
 108
 109         private function backup( $fileName ) {
 110                 $this->output( "Backing up database:\n   Locking..." );
 111                 $this->db->query( 'BEGIN IMMEDIATE TRANSACTION', __METHOD__ );
 112                 $ourFile = $this->db->mDatabaseFile;
 113                 $this->output( "   Copying database file $ourFile to $fileName... " );
 114                 wfSuppressWarnings( false );
 115                 if ( !copy( $ourFile, $fileName ) ) {
 116                         $err = error_get_last();
 117                         $this->error( "      {$err['message']}" );
 118                 }
 119                 wfSuppressWarnings( true );
 120                 $this->output( "   Releasing lock...\n" );
 121                 $this->db->query( 'COMMIT TRANSACTION', __METHOD__ );
 122         }
 123
 124         private function checkSyntax() {
 125                 if ( !Sqlite::IsPresent() ) {
 126                         $this->error( "Error: SQLite support not found\n" );
 127                 }
 128                 $files = array( $this->getOption( 'check-syntax' ) );
 129                 $files += $this->mArgs;
 130                 $result = Sqlite::checkSqlSyntax( $files );
 131                 if ( $result === true ) {
 132                         $this->output( "SQL syntax check: no errors detected.\n" );
 133                 } else {
 134                         $this->error( "Error: $result\n" );
 135                 }
 136         }
 137 }
 138
 139 $maintClass = "SqliteMaintenance";
 140 require_once RUN_MAINTENANCE_IF_MAIN;