e3d7f7c8d8
add test-frame-work for cost model according paper Testing the Accuracy of Query Optimizers
70 lines
2.5 KiB
Python
70 lines
2.5 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 unittest import result
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import mysql.connector
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from typing import List, Tuple
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class SQLExecutor:
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def __init__(self, user: str, password: str, host: str, port: int, database: str) -> None:
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self.connection = mysql.connector.connect(
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user=user,
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password=password,
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host=host,
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port=port,
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database=database
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)
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self.cursor = self.connection.cursor()
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self.wait_fetch_time_index = 16
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def execute_query(self, query: str, parameters: Tuple | None) -> List[Tuple]:
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if parameters:
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self.cursor.execute(query, parameters)
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else:
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self.cursor.execute(query)
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results = self.cursor.fetchall()
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return results
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def get_execute_time(self, query: str) -> float:
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self.execute_query(query, None)
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profile = self.execute_query("show query profile\"\"", None)
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return float(profile[0][self.wait_fetch_time_index].replace("ms", ""))
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def execute_many_queries(self, queries: List[Tuple[str, Tuple]]) -> List[List[Tuple]]:
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results = []
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for query, parameters in queries:
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result = self.execute_query(query, parameters)
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results.append(result)
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return results
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def get_plan_with_cost(self, query: str):
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result = self.execute_query(f"explain optimized plan {query}", None)
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cost = float(result[0][0].replace("cost = ", ""))
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plan = "".join([s[0] for s in result[1:]])
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return plan, cost
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def commit(self) -> None:
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self.connection.commit()
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def rollback(self) -> None:
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self.connection.rollback()
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def close(self) -> None:
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self.cursor.close()
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self.connection.close()
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