feat(devmanual): Add \OCP\DB\IResult::fetch deprecation

Signed-off-by: Christoph Wurst <[email protected]>

developer_manual/app_publishing_maintenance/app_upgrade_guide/upgrade_to_28.rst

@@ -176,6 +176,8 @@ Changed APIs
 Deprecated APIs
 ^^^^^^^^^^^^^^^
 
+* ``\OCP\DB\IResult::fetch``: use the new ``fetchAssociative``, ``fetchNumeric`` and ``fetchOne`` instead. If you called ``fetch`` without arguments, ``fetchAssociative`` is the direct replacement. Beware that the new methods throw a different exception.
+* ``\OCP\DB\IResult::fetchAll``: use the new ``fetchAllAssociative``, ``fetchAllNumeric`` and ``fetchOne`` instead. If you called ``fetchAll`` without arguments, ``fetchAllAssociative`` is the direct replacement. Beware that the new methods throw a different exception.
 * ``\OCP\Preview\BeforePreviewFetchedEvent`` passing ``null`` for ``width, height, crop or mode`` is deprecated. Starting with Nextcloud 31 they are mandatory.
 
 Removed APIs

developer_manual/basics/storage/database.rst

@@ -35,9 +35,9 @@ Inside your database layer class you can now start running queries like:
                    $qb->expr()->eq('id', $qb->createNamedParameter($id, IQueryBuilder::PARAM_INT))
                );
 
-            $cursor = $qb->execute();
-            $row = $cursor->fetch();
-            $cursor->closeCursor();
+            $result = $qb->executeQuery();
+            $row = $result->fetchAssociative();
+            $result->closeCursor();
 
             return $row;
         }
@@ -183,9 +183,9 @@ To create a mapper, inherit from the mapper base class and call the parent const
                    $qb->expr()->eq('name', $qb->createNamedParameter($name, IQueryBuilder::PARAM_STR))
                );
 
-            $cursor = $qb->execute();
-            $row = $cursor->fetch();
-            $cursor->closeCursor();
+            $result = $qb->executeQuery();
+            $row = $result->fetchAssociative();
+            $result->closeCursor();
 
             return $row['count'];
         }