OpenSlides/server/openslides/utils/postgres.py
Finn Stutzenstein 8049bfa91e
Performance improvements for OS3+
- Cleans up log messages in the client
- Refactored the autoupdate bundle code into an own file
- Added bulk creates for History in Postgresql. This is the only database system
  that supports returning all ids whan multiple elements are inserted. We can
  make usage out of it.
- Added a `disable_history`, that is request-wide
- Disabled history on poll vote requests
- Removed unnecessary user ordering
- Reduced the queries for creating motion vote objects by one
- removed final_data: This was not prefetched. Using the normal data collection
  the data is prefetched
- removed unnecessary user query if vore delegation is not used
2021-01-21 12:53:51 +01:00

22 lines
742 B
Python

from django.db import connection
def is_postgres() -> bool:
return connection.vendor == "postgresql"
def restart_id_sequence(table_name: str) -> None:
"""
This function resets the id sequence from the given table (the current auto
increment value for the id field) to the max_id+1. This is needed, when manually
inserting object id, because Postgresql does not update the id sequence in this case.
"""
if not is_postgres():
return
with connection.cursor() as cursor:
cursor.execute(f"SELECT max(id) + 1 as max FROM {table_name};")
max_id = cursor.fetchone()[0]
if max_id is not None:
cursor.execute(f"ALTER SEQUENCE {table_name}_id_seq RESTART WITH {max_id};")