AbstractDatabaseSchemaUpdate.php

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<?php
namespace TYPO3\CMS\Install\Updates;

abstract class AbstractDatabaseSchemaUpdate extends AbstractUpdate {

    protected $title;

    protected $schemaMigrationService;

    protected $expectedSchemaService;

    protected $objectManager;

    public function __construct() {
        $this->objectManager = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Extbase\\Object\\ObjectManager');
        $this->schemaMigrationService = $this->objectManager->get('TYPO3\\CMS\\Install\\Service\\SqlSchemaMigrationService');
        $this->expectedSchemaService = $this->objectManager->get('TYPO3\\CMS\\Install\\Service\\SqlExpectedSchemaService');
    }

    protected function getDatabaseDifferences() {
        $expectedSchema = $this->expectedSchemaService->getExpectedDatabaseSchema();
        $currentSchema = $this->schemaMigrationService->getFieldDefinitions_database();

        // Difference from expected to current
        return $this->schemaMigrationService->getDatabaseExtra($expectedSchema, $currentSchema);
    }

}