superset 2020-09-25_10-56_18532d70ab98_fix_table_unique_constraint_in_mysql 源码
superset 2020-09-25_10-56_18532d70ab98_fix_table_unique_constraint_in_mysql 代码
文件路径：/superset/migrations/versions/2020-09-25_10-56_18532d70ab98_fix_table_unique_constraint_in_mysql.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.
"""Delete table_name unique constraint in mysql
Revision ID: 18532d70ab98
Revises: 3fbbc6e8d654
Create Date: 2020-09-25 10:56:13.711182
"""
# revision identifiers, used by Alembic.
revision = "18532d70ab98"
down_revision = "3fbbc6e8d654"
from alembic import op
from sqlalchemy.dialects.mysql.base import MySQLDialect
from sqlalchemy.engine.reflection import Inspector
from superset.utils.core import generic_find_uq_constraint_name
def upgrade():
bind = op.get_bind()
# Uniqueness constraint if present only exists in MySQL.
if isinstance(bind.dialect, MySQLDialect):
constraint_name = generic_find_uq_constraint_name(
"tables", {"table_name"}, Inspector.from_engine(bind)
)
if constraint_name:
op.drop_constraint(constraint_name, "tables", type_="unique")
def downgrade():
pass
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