sqlite.php

Go to the documentation of this file.

<?php
require_once __DIR__ . '/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 );
    }

    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;