DatabaseRepository.php
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DatabaseRepository.php
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	<?php

	namespace MediaWiki\Extension\OAuth\Repository;

	use MediaWiki\Extension\OAuth\Backend\Utils;
	use Wikimedia\Rdbms\IDatabase;

	abstract class DatabaseRepository {

	/**
	* @param int $index
	* @return IDatabase
	*/
	public function getDB( $index = DB_REPLICA ) {
	return Utils::getCentralDB( $index );
	}

	/**
	* Is given identifier stored in the DB
	*
	* @param string $identifier
	* @return bool
	*/
	public function identifierExists( $identifier ) {
	return $this->getDB()->newSelectQueryBuilder()
	->select( $this->getIdentifierField() )
	->from( $this->getTableName() )
	->where( [ $this->getIdentifierField() => $identifier ] )
	->caller( __METHOD__ )
	->fetchRow() !== false;
	}

	abstract protected function getTableName(): string;

	abstract protected function getIdentifierField(): string;
	}