MatrixSynapse/synapse/storage/schema/delta/47/state_group_seq.py

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# Copyright 2018 New Vector Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from synapse.storage.engines import PostgresEngine
def run_create(cur, database_engine, *args, **kwargs):
if isinstance(database_engine, PostgresEngine):
# if we already have some state groups, we want to start making new
# ones with a higher id.
cur.execute("SELECT max(id) FROM state_groups")
row = cur.fetchone()
if row[0] is None:
start_val = 1
else:
start_val = row[0] + 1
cur.execute(
"CREATE SEQUENCE state_group_id_seq START WITH %s",
(start_val, ),
)
def run_upgrade(*args, **kwargs):
pass