migrateImageCommentTemp.php

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<?php
require_once __DIR__ . '/Maintenance.php';
 
class MigrateImageCommentTemp extends LoggedUpdateMaintenance {
    public function __construct() {
        parent::__construct();
        $this->addDescription(
            'Merges image_comment_temp into the image table'
        );
    }
 
    public function setForce( $forced = true ) {
        $this->mOptions['force'] = $forced;
    }
 
    protected function getUpdateKey() {
        return __CLASS__;
    }
 
    protected function doDBUpdates() {
        $batchSize = $this->getBatchSize();
 
        $dbw = $this->getDB( DB_MASTER );
        if ( !$dbw->fieldExists( 'image', 'img_description_id', __METHOD__ ) ) {
            $this->output( "Run update.php to create img_description_id.\n" );
            return false;
        }
        if ( !$dbw->tableExists( 'image_comment_temp', __METHOD__ ) ) {
            $this->output( "image_comment_temp does not exist, so nothing to do.\n" );
            return true;
        }
 
        $this->output( "Merging image_comment_temp into the image table...\n" );
        $conds = [];
        $updated = 0;
        $deleted = 0;
        while ( true ) {
            $this->beginTransaction( $dbw, __METHOD__ );
 
            $res = $dbw->select(
                [ 'image_comment_temp', 'image' ],
                [
                    'name' => 'imgcomment_name',
                    'oldid' => 'imgcomment_description_id',
                    'newid' => 'img_description_id',
                ],
                $conds,
                __METHOD__,
                [ 'LIMIT' => $batchSize, 'ORDER BY' => [ 'name' ] ],
                [ 'image' => [ 'JOIN', 'img_name = imgcomment_name' ] ]
            );
            $numRows = $res->numRows();
 
            $toDelete = [];
            $last = null;
            foreach ( $res as $row ) {
                $last = $row->name;
                $toDelete[] = $row->name;
                if ( !$row->newid ) {
                    $dbw->update(
                        'image',
                        [ 'img_description_id' => $row->oldid ],
                        [ 'img_name' => $row->name ],
                        __METHOD__
                    );
                    $updated++;
                } elseif ( $row->newid !== $row->oldid ) {
                    $this->error(
                        "Image \"$row->name\" has img_description_id = $row->newid and "
                        . "imgcomment_description_id = $row->oldid. Ignoring the latter."
                    );
                }
            }
            if ( $toDelete ) {
                $dbw->delete( 'image_comment_temp', [ 'imgcomment_name' => $toDelete ], __METHOD__ );
                $deleted += count( $toDelete );
            }
 
            $this->commitTransaction( $dbw, __METHOD__ );
 
            if ( $numRows < $batchSize ) {
                // We must have reached the end
                break;
            }
 
            $this->output( "... $last, updated $updated, deleted $deleted\n" );
            $conds = [ 'imgcomment_name > ' . $dbw->addQuotes( $last ) ];
        }
 
        // This should be 0, so it should be very fast
        $count = (int)$dbw->selectField( 'image_comment_temp', 'COUNT(*)', [], __METHOD__ );
        if ( $count !== 0 ) {
            $this->error( "Ignoring $count orphaned image_comment_temp row(s)." );
        }
 
        $this->output(
            "Completed merge of image_comment_temp into the image table, "
            . "$updated image rows updated, $deleted image_comment_temp rows deleted.\n"
        );
 
        return true;
    }
}
 
$maintClass = MigrateImageCommentTemp::class;
require_once RUN_MAINTENANCE_IF_MAIN;