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(
  36                         'vacuum',
  37                         'Clean up database by removing deleted pages. Decreases database file size'
  38                 );
  39                 $this->addOption( 'integrity', 'Check database for integrity' );
  40                 $this->addOption( 'backup-to', 'Backup database to the given file', false, true );
  41                 $this->addOption( 'check-syntax', 'Check SQL file(s) for syntax errors', false, true );
  42         }
  43
  44         /**
  45          * While we use database connection, this simple lie prevents useless --dbpass and
  46          * --dbuser options from appearing in help message for this script.
  47          *
  48          * @return int DB constant
  49          */
  50         public function getDbType() {
  51                 return Maintenance::DB_NONE;
  52         }
  53
  54         public function execute() {
  55                 // Should work even if we use a non-SQLite database
  56                 if ( $this->hasOption( 'check-syntax' ) ) {
  57                         $this->checkSyntax();
  58                         return;
  59                 }
  60
  61                 $this->db = wfGetDB( DB_MASTER );
  62
  63                 if ( $this->db->getType() != 'sqlite' ) {
  64                         $this->error( "This maintenance script requires a SQLite database.\n" );
  65                         return;
  66                 }
  67
  68                 if ( $this->hasOption( 'vacuum' ) ) {
  69                         $this->vacuum();
  70                 }
  71
  72                 if ( $this->hasOption( 'integrity' ) ) {
  73                         $this->integrityCheck();
  74                 }
  75
  76                 if ( $this->hasOption( 'backup-to' ) ) {
  77                         $this->backup( $this->getOption( 'backup-to' ) );
  78                 }
  79         }
  80
  81         private function vacuum() {
  82                 $prevSize = filesize( $this->db->mDatabaseFile );
  83                 if ( $prevSize == 0 ) {
  84                         $this->error( "Can't vacuum an empty database.\n", true );
  85                 }
  86
  87                 $this->output( 'VACUUM: ' );
  88                 if ( $this->db->query( 'VACUUM' ) ) {
  89                         clearstatcache();
  90                         $newSize = filesize( $this->db->mDatabaseFile );
  91                         $this->output( sprintf( "Database size was %d, now %d (%.1f%% reduction).\n",
  92                                 $prevSize, $newSize, ( $prevSize - $newSize ) * 100.0 / $prevSize ) );
  93                 } else {
  94                         $this->output( 'Error\n' );
  95                 }
  96         }
  97
  98         private function integrityCheck() {
  99                 $this->output( "Performing database integrity checks:\n" );
 100                 $res = $this->db->query( 'PRAGMA integrity_check' );
 101
 102                 if ( !$res || $res->numRows() == 0 ) {
 103                         $this->error( "Error: integrity check query returned nothing.\n" );
 104                         return;
 105                 }
 106
 107                 foreach ( $res as $row ) {
 108                         $this->output( $row->integrity_check );
 109                 }
 110         }
 111
 112         private function backup( $fileName ) {
 113                 $this->output( "Backing up database:\n   Locking..." );
 114                 $this->db->query( 'BEGIN IMMEDIATE TRANSACTION', __METHOD__ );
 115                 $ourFile = $this->db->mDatabaseFile;
 116                 $this->output( "   Copying database file $ourFile to $fileName... " );
 117                 wfSuppressWarnings( false );
 118                 if ( !copy( $ourFile, $fileName ) ) {
 119                         $err = error_get_last();
 120                         $this->error( "      {$err['message']}" );
 121                 }
 122                 wfSuppressWarnings( true );
 123                 $this->output( "   Releasing lock...\n" );
 124                 $this->db->query( 'COMMIT TRANSACTION', __METHOD__ );
 125         }
 126
 127         private function checkSyntax() {
 128                 if ( !Sqlite::IsPresent() ) {
 129                         $this->error( "Error: SQLite support not found\n" );
 130                 }
 131                 $files = array( $this->getOption( 'check-syntax' ) );
 132                 $files += $this->mArgs;
 133                 $result = Sqlite::checkSqlSyntax( $files );
 134                 if ( $result === true ) {
 135                         $this->output( "SQL syntax check: no errors detected.\n" );
 136                 } else {
 137                         $this->error( "Error: $result\n" );
 138                 }
 139         }
 140 }
 141
 142 $maintClass = "SqliteMaintenance";
 143 require_once RUN_MAINTENANCE_IF_MAIN;