batch_delete.py

# Copyright 2022 PingCAP, Inc.
#
# Licensed 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.

import MySQLdb
import datetime
import time

connection = MySQLdb.connect(
    host="127.0.0.1",
    port=4000,
    user="root",
    password="",
    database="bookshop",
    autocommit=True
)

with connection:
    with connection.cursor() as cursor:
        start_time = datetime.datetime(2022, 4, 15)
        end_time = datetime.datetime(2022, 4, 15, 0, 15)
        affect_rows = -1
        while affect_rows != 0:
            delete_sql = "DELETE FROM `bookshop`.`ratings` WHERE `rated_at` >= %s AND  `rated_at` <= %s LIMIT 1000"
            affect_rows = cursor.execute(delete_sql, (start_time, end_time))
            print(f'delete {affect_rows} data')
            time.sleep(1)