superset 2021-07-27_08-25_31b2a1039d4a_drop_tables_constraint 源码
superset 2021-07-27_08-25_31b2a1039d4a_drop_tables_constraint 代码
文件路径：/superset/migrations/versions/2021-07-27_08-25_31b2a1039d4a_drop_tables_constraint.py
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you 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.
"""drop tables constraint
Revision ID: 31b2a1039d4a
Revises: ae1ed299413b
Create Date: 2021-07-27 08:25:20.755453
"""
from alembic import op
from sqlalchemy import engine
from sqlalchemy.exc import OperationalError, ProgrammingError
from superset.utils.core import generic_find_uq_constraint_name
# revision identifiers, used by Alembic.
revision = "31b2a1039d4a"
down_revision = "ae1ed299413b"
conv = {"uq": "uq_%(table_name)s_%(column_0_name)s"}
def upgrade():
bind = op.get_bind()
insp = engine.reflection.Inspector.from_engine(bind)
# Drop the uniqueness constraint if it exists.
constraint = generic_find_uq_constraint_name("tables", {"table_name"}, insp)
if constraint:
with op.batch_alter_table("tables", naming_convention=conv) as batch_op:
batch_op.drop_constraint(constraint, type_="unique")
def downgrade():
# One cannot simply re-add the uniqueness constraint as it may not have previously
# existed.
pass
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