fix migration 5.3.30 for different stud.ip version, fixes #5569

Closes #5569

Merge request studip/studip!4192

1 files changed, 9 insertions, 0 deletions

diff --git a/lib/migrations/DatabaseMigrationTrait.php b/lib/migrations/DatabaseMigrationTrait.php
index f8fad72..ab6bf05 100644
--- a/lib/migrations/DatabaseMigrationTrait.php
+++ b/lib/migrations/DatabaseMigrationTrait.php
@@ -19,4 +19,13 @@ trait DatabaseMigrationTrait
         $query = "SHOW COLUMNS FROM `{$table}` LIKE ?";
         return (bool) DBManager::get()->fetchOne($query, [$column]);
     }
+
+    /**
+     * Returns whether a table with the given name exists.
+     */
+    protected function tableExists(string $table): bool
+    {
+        $query = "SHOW TABLES LIKE ?";
+        return (bool) DBManager::get()->fetchOne($query, [$table]);
+    }
 }