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60 lines
2.3 KiB
Python
60 lines
2.3 KiB
Python
# Licensed to the Apache Software Foundation (ASF) under one
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# or more contributor license agreements. See the NOTICE file
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# distributed with this work for additional information
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# regarding copyright ownership. The ASF licenses this file
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# to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance
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# with the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing,
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# software distributed under the License is distributed on an
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# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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# KIND, either express or implied. See the License for the
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# specific language governing permissions and limitations
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# under the License.
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from alembic.operations import Operations
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from sqlalchemy.engine.reflection import Inspector
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naming_convention = {
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"fk": "fk_%(table_name)s_%(column_0_name)s_%(referred_table_name)s",
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"uq": "uq_%(table_name)s_%(column_0_name)s",
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}
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def create_unique_constraint(
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op: Operations, index_id: str, table_name: str, uix_columns: list[str]
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) -> None:
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# Get the database connection and inspector
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bind = op.get_bind()
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inspector = Inspector.from_engine(bind)
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# Check if the unique constraint already exists
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existing_constraints = inspector.get_unique_constraints(table_name)
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for constraint in existing_constraints:
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if constraint["name"] == index_id:
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# Constraint already exists, no need to create it
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return
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# Create the unique constraint if it doesn't exist
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with op.batch_alter_table(
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table_name, naming_convention=naming_convention
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) as batch_op:
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batch_op.create_unique_constraint(index_id, uix_columns)
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def drop_unique_constraint(op: Operations, index_id: str, table_name: str) -> None:
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dialect = op.get_bind().dialect.name
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with op.batch_alter_table(
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table_name, naming_convention=naming_convention
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) as batch_op:
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if dialect == "mysql":
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# MySQL requires specifying the type of constraint
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batch_op.drop_constraint(index_id, type_="unique")
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else:
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# For other databases, a standard drop_constraint call is sufficient
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batch_op.drop_constraint(index_id)
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