feat(db): add method to test mariadb

There are some behavioral differences that apps may need to check for.
See discussion on #51175 for more info.

This preserves the existing behavior of getDatabaseProvider()

Signed-off-by: Varun Patil <varunpatil@ucla.edu>

Author: pulsejet

lib/private/DB/Connection.php

@@ -16,6 +16,7 @@
 use Doctrine\DBAL\Driver\ServerInfoAwareConnection;
 use Doctrine\DBAL\Exception;
 use Doctrine\DBAL\Exception\ConnectionLost;
+use Doctrine\DBAL\Platforms\MariaDBPlatform;
 use Doctrine\DBAL\Platforms\MySQLPlatform;
 use Doctrine\DBAL\Platforms\OraclePlatform;
 use Doctrine\DBAL\Platforms\PostgreSQLPlatform;
@@ -915,11 +916,13 @@ private function getConnectionName(): string {
 	}
 
 	/**
-	 * @return IDBConnection::PLATFORM_MYSQL|IDBConnection::PLATFORM_ORACLE|IDBConnection::PLATFORM_POSTGRES|IDBConnection::PLATFORM_SQLITE
+	 * @return IDBConnection::PLATFORM_MYSQL|IDBConnection::PLATFORM_ORACLE|IDBConnection::PLATFORM_POSTGRES|IDBConnection::PLATFORM_SQLITE|IDBConnection::PLATFORM_MARIADB
 	 */
-	public function getDatabaseProvider(): string {
+	public function getDatabaseProvider(bool $strict = false): string {
 		$platform = $this->getDatabasePlatform();
-		if ($platform instanceof MySQLPlatform) {
+		if ($strict && $platform instanceof MariaDBPlatform) {
+			return IDBConnection::PLATFORM_MARIADB;
+		} elseif ($platform instanceof MySQLPlatform) {
 			return IDBConnection::PLATFORM_MYSQL;
 		} elseif ($platform instanceof OraclePlatform) {
 			return IDBConnection::PLATFORM_ORACLE;

lib/private/DB/ConnectionAdapter.php

@@ -237,10 +237,10 @@ public function getInner(): Connection {
 	}
 
 	/**
-	 * @return self::PLATFORM_MYSQL|self::PLATFORM_ORACLE|self::PLATFORM_POSTGRES|self::PLATFORM_SQLITE
+	 * @return self::PLATFORM_MYSQL|self::PLATFORM_ORACLE|self::PLATFORM_POSTGRES|self::PLATFORM_SQLITE|self::PLATFORM_MARIADB
 	 */
-	public function getDatabaseProvider(): string {
-		return $this->inner->getDatabaseProvider();
+	public function getDatabaseProvider(bool $strict = false): string {
+		return $this->inner->getDatabaseProvider($strict);
 	}
 
 	/**

lib/public/IDBConnection.php

@@ -44,6 +44,11 @@ interface IDBConnection {
 	 */
 	public const PLATFORM_SQLITE = 'sqlite';
 
+	/**
+	 * @since 32.0.0
+	 */
+	public const PLATFORM_MARIADB = 'mariadb';
+
 	/**
 	 * Gets the QueryBuilder for the connection.
 	 *
@@ -357,11 +362,13 @@ public function migrateToSchema(Schema $toSchema): void;
 
 	/**
 	 * Returns the database provider name
+	 *
+	 * @param bool $strict differentiate between database flavors, e.g. MySQL vs MariaDB
 	 * @link https://github.com/nextcloud/server/issues/30877
 	 * @since 28.0.0
-	 * @return self::PLATFORM_MYSQL|self::PLATFORM_ORACLE|self::PLATFORM_POSTGRES|self::PLATFORM_SQLITE
+	 * @return self::PLATFORM_MYSQL|self::PLATFORM_ORACLE|self::PLATFORM_POSTGRES|self::PLATFORM_SQLITE|self::PLATFORM_MARIADB
 	 */
-	public function getDatabaseProvider(): string;
+	public function getDatabaseProvider(bool $strict = false): string;
 
 	/**
 	 * Get the shard definition by name, if configured