# Copyright (c) 2020, 2022, Oracle and/or its affiliates.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License, version 2.0, as
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# published by the Free Software Foundation.
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#
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# This program is also distributed with certain software (including
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# but not limited to OpenSSL) that is licensed under separate terms,
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# as designated in a particular file or component or in included license
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# documentation. The authors of MySQL hereby grant you an
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# additional permission to link the program and your derivative works
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# with the separately licensed software that they have included with
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# MySQL.
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#
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# Without limiting anything contained in the foregoing, this file,
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# which is part of MySQL Connector/Python, is also subject to the
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# Universal FOSS Exception, version 1.0, a copy of which can be found at
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# http://oss.oracle.com/licenses/universal-foss-exception.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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# See the GNU General Public License, version 2.0, for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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"""Database Features."""
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from typing import Any, List
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from django.db.backends.mysql.features import DatabaseFeatures as MySQLDatabaseFeatures
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from django.utils.functional import cached_property
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class DatabaseFeatures(MySQLDatabaseFeatures):
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"""Database Features Specification class."""
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empty_fetchmany_value: List[Any] = []
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@cached_property
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def can_introspect_check_constraints(self) -> bool: # type: ignore[override]
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"""Check if backend support introspection CHECK of constraints."""
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return self.connection.mysql_version >= (8, 0, 16)
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@cached_property
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def supports_microsecond_precision(self) -> bool:
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"""Check if backend support microsecond precision."""
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return self.connection.mysql_version >= (5, 6, 3)
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