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georgia-tech-db / eva / #832

12 Oct 2023 08:31AM UTC coverage: 0.0% (-68.5%) from 68.493%
#832

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/evadb/executor/use_executor.py
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# coding=utf-8
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# Copyright 2018-2023 EvaDB
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# 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, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from typing import Iterator
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from evadb.database import EvaDBDatabase
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from evadb.executor.abstract_executor import AbstractExecutor
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from evadb.executor.executor_utils import ExecutorError
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from evadb.models.storage.batch import Batch
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from evadb.parser.use_statement import UseStatement
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from evadb.third_party.databases.interface import get_database_handler
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class UseExecutor(AbstractExecutor):
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    def __init__(self, db: EvaDBDatabase, node: UseStatement):
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        super().__init__(db, node)
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        self._database_name = node.database_name
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        self._query_string = node.query_string
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    def exec(self, *args, **kwargs) -> Iterator[Batch]:
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        db_catalog_entry = self.db.catalog().get_database_catalog_entry(
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            self._database_name
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        )
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        if db_catalog_entry is None:
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            raise ExecutorError(
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                f"{self._database_name} data source does not exist. Use CREATE DATABASE to add a new data source."
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            )
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        with get_database_handler(
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            db_catalog_entry.engine, **db_catalog_entry.params
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        ) as handler:
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            resp = handler.execute_native_query(self._query_string)
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        if resp and resp.error is None:
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            yield Batch(resp.data)
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        else:
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            raise ExecutorError(resp.error)
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