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<?php
/**
* Performs some operations specific to SQLite database backend
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @ingroup Maintenance
*/
require_once( dirname( __FILE__ ) . '/Maintenance.php' );
class SqliteMaintenance extends Maintenance {
public function __construct() {
parent::__construct();
$this->mDescription = "Performs some operations specific to SQLite database backend";
$this->addOption( 'vacuum', 'Clean up database by removing deleted pages. Decreases database file size' );
$this->addOption( 'integrity', 'Check database for integrity' );
$this->addOption( 'backup-to', 'Backup database to the given file', false, true );
$this->addOption( 'check-syntax', 'Check SQL file(s) for syntax errors', false, true );
}
/**
* While we use database connection, this simple lie prevents useless --dbpass and
* --dbuser options from appearing in help message for this script.
*
* @return int DB constant
*/
public function getDbType() {
return Maintenance::DB_NONE;
}
public function execute() {
// Should work even if we use a non-SQLite database
if ( $this->hasOption( 'check-syntax' ) ) {
$this->checkSyntax();
return;
}
$this->db = wfGetDB( DB_MASTER );
if ( $this->db->getType() != 'sqlite' ) {
$this->error( "This maintenance script requires a SQLite database.\n" );
return;
}
if ( $this->hasOption( 'vacuum' ) ) {
$this->vacuum();
}
if ( $this->hasOption( 'integrity' ) ) {
$this->integrityCheck();
}
if ( $this->hasOption( 'backup-to' ) ) {
$this->backup( $this->getOption( 'backup-to' ) );
}
}
private function vacuum() {
$prevSize = filesize( $this->db->mDatabaseFile );
if ( $prevSize == 0 ) {
$this->error( "Can't vacuum an empty database.\n", true );
}
$this->output( 'VACUUM: ' );
if ( $this->db->query( 'VACUUM' ) ) {
clearstatcache();
$newSize = filesize( $this->db->mDatabaseFile );
$this->output( sprintf( "Database size was %d, now %d (%.1f%% reduction).\n",
$prevSize, $newSize, ( $prevSize - $newSize ) * 100.0 / $prevSize ) );
} else {
$this->output( 'Error\n' );
}
}
private function integrityCheck() {
$this->output( "Performing database integrity checks:\n" );
$res = $this->db->query( 'PRAGMA integrity_check' );
if ( !$res || $res->numRows() == 0 ) {
$this->error( "Error: integrity check query returned nothing.\n" );
return;
}
foreach ( $res as $row ) {
$this->output( $row->integrity_check );
}
}
private function backup( $fileName ) {
$this->output( "Backing up database:\n Locking..." );
$this->db->query( 'BEGIN IMMEDIATE TRANSACTION', __METHOD__ );
$ourFile = $this->db->mDatabaseFile;
$this->output( " Copying database file $ourFile to $fileName... " );
wfSuppressWarnings( false );
if ( !copy( $ourFile, $fileName ) ) {
$err = error_get_last();
$this->error( " {$err['message']}" );
}
wfSuppressWarnings( true );
$this->output( " Releasing lock...\n" );
$this->db->query( 'COMMIT TRANSACTION', __METHOD__ );
}
private function checkSyntax() {
if ( !Sqlite::IsPresent() ) {
$this->error( "Error: SQLite support not found\n" );
}
$files = array( $this->getOption( 'check-syntax' ) );
$files += $this->mArgs;
$result = Sqlite::checkSqlSyntax( $files );
if ( $result === true ) {
$this->output( "SQL syntax check: no errors detected.\n" );
} else {
$this->error( "Error: $result\n" );
}
}
}
$maintClass = "SqliteMaintenance";
require_once( RUN_MAINTENANCE_IF_MAIN );
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