update db entry on duplicate key

mediametadatatodb_app/resources/MediametadataToDB.py

@@ -186,14 +186,17 @@ def _get_record_id(graph) -> str:
 def _create_sql_stmt(table_name, record, fields) -> str:
     db_fields = [dbField for dbField in fields
                  if dbField in record and record[dbField] is not None]
-    db_values = ','.join([str(record[db_field])
-                          if isinstance(record[db_field], numbers.Number)
-                          else "'{}'".format(record[db_field])
-                          for db_field in db_fields])
+    db_values = [str(record[db_field])
+                 if isinstance(record[db_field], numbers.Number)
+                 else "'{}'".format(record[db_field])
+                 for db_field in db_fields]
+    key_value = \
+        ", ".join([k + "='" + v + "'" for (k, v) in zip(db_fields, db_values) if k != 'sig'])
     db_fields = ','.join(db_fields)
+    db_values = ','.join(db_values)
     # noinspection SqlNoDataSourceInspection
-    return 'INSERT IGNORE INTO {} ({}) VALUES ({})'.format(
-        table_name, db_fields, db_values)
+    return 'INSERT INTO {} ({}) VALUES ({}) ON DUPLICATE KEY UPDATE {}'.format(
+        table_name, db_fields, db_values, key_value)
 
 
 def _create_entities_entry(record, mariadb_cursor):