use %s as substitute

mediametadatatodb_app/resources/indexer.py

@@ -44,8 +44,8 @@ class Indexer:
         db_values = [record[f] for f in fields if f in record and record[f]]
         db_values.extend([record[f] for f in fields if f != 'sig' and f in record and record[f]])
         db_fields = ','.join([f for f in fields if f in record and record[f]])
-        db_value_placeholders = ', '.join(['?' for f in fields if f in record and record[f]])
-        key_value = ", ".join([f"{f}=?" for f in fields
+        db_value_placeholders = ', '.join(['%s' for f in fields if f in record and record[f]])
+        key_value = ", ".join([f"{f}=%s" for f in fields
                                if f != 'sig' and f in record and record[f]])
         # noinspection SqlNoDataSourceInspection
         return 'INSERT INTO {} ({}) VALUES ({}) ON DUPLICATE KEY UPDATE {}'.format(