use insertIfNotExists to store new mimetypes.

Also throw an error if we can't find the mimetype after insert

Signed-off-by: Robin Appelman <robin@icewind.nl>

lib/private/Files/Type/Loader.php

@@ -114,20 +114,9 @@ class Loader implements IMimeTypeLoader {
 	 * @param int inserted ID
 	 */
 	protected function store($mimetype) {
-		try {
+		$this->dbConnection->insertIfNotExist('*PREFIX*mimetypes', [
-			$qb = $this->dbConnection->getQueryBuilder();
+			'mimetype' => $mimetype
-			$qb->insert('mimetypes')
+		]);
-				->values([
-					'mimetype' => $qb->createNamedParameter($mimetype)
-				]);
-			$qb->execute();
-		} catch (UniqueConstraintViolationException $e) {
-			if ($this->dbConnection->inTransaction()) {
-				// if we're inside a transaction we can't recover safely
-				throw $e;
-			}
-			// something inserted it before us
-		}
 
 		$fetch = $this->dbConnection->getQueryBuilder();
 		$fetch->select('id')
@@ -137,6 +126,10 @@ class Loader implements IMimeTypeLoader {
 			));
 		$row = $fetch->execute()->fetch();
 
+		if (!$row) {
+			throw new \Exception("Failed to get mimetype id for $mimetype after trying to store it");
+		}
+
 		$this->mimetypes[$row['id']] = $mimetype;
 		$this->mimetypeIds[$mimetype] = $row['id'];
 		return $row['id'];