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MySQL スレッドプール

Last updated at Posted at 2021-12-07

MySQL スレッドプール サンプルモジュール(Python)

参考:https://dev.mysql.com/doc/refman/5.6/ja/faqs-thread-pool.html#faq-thread-pool-what-solve
個人ブログ:https://wintercat.jp/post/databasecat/
あくまでもご参考で〜:coffee:

import 必要なモジュール

import pymysql
from dbutils.pooled_db import PooledDB
import config
# -*- coding:utf-8 -*-
# @Author: WinterCat
# @File : database_pool.py

class DataBaseConnectionPool:
    __pool = None
    # init database connection
    def __init__(self):
        self.conn = self.get_connection().connection()
        self.cur = self.conn.cursor(pymysql.cursors.DictCursor)

    # connection create and create config file to set it
    def get_connection(self):
        if self.__pool is None:
            __pool = PooledDB(
                creator=pymysql,
                maxconnections=config.DB_MAX_CONNECTIONS,
                mincached=config.DB_MIN_CACHED,
                maxcached=config.DB_MAX_CACHED,
                maxshared=config.DB_MAX_SHARED,
                blocking=config.DB_BLOCKING,
                maxusage=config.DB_MAX_USAGE,
                setsession=config.DB_SET_SESSION,
                ping=config.DB_PING,
                host=config.DB_HOST,
                user=config.DB_USER,
                password=config.DB_PASSWORD,
                database=config.DB_NAME,
                charset=config.DB_CHARSET
            )
        return __pool

    # connection auto close
    def __del__(self):
        self.cur.close()
        self.conn.close()


# search database by query
def search_data(query):
    connection = DataBaseConnectionPool()
    connection.cur.execute(query)
    return connection.cur.fetchall()


# insert data by query
def update_data(query):
    connection = DataBaseConnectionPool()
    connection.cur.execute(query)
    return connection.conn.commit()

config.py

基本的に設置または編集が必要なところは
DB_HOST, DB_POST, DB_USER, DB_PASSWORD, DB_NAME となります。

DB_CREATOR = 'pymysql'
DB_HOST = 'IP ADDRESS'  # データベースのIPアドレス
DB_PORT = 3306
DB_NAME = 'DB_NAME' # データベース名前
DB_USER = 'USERNAME' 
DB_PASSWORD = 'PASSWORD'
DB_CHARSET = 'utf8mb4' # encode
# free cached min
DB_MIN_CACHED = 10
# free cached max
DB_MAX_CACHED = 22
#  pools create max
DB_MAX_CONNECTIONS = 100
#  share pool max
DB_MAX_SHARED = 20
# max pool block
DB_BLOCKING = True
#  connection use again
DB_MAX_USAGE = 0
# session
DB_SET_SESSION = []
# ping
DB_PING = 0

使用方法について

検索の方法は:search_data を使え
何かをInsert、またはアップデートすると:add_data を使え
↓例となります。

# @Author: WinterCat
from database_service.database_pool import add_data, search_data
# テーブルを作る
def create_table():
    sql = '''
    CREATE TABLE IF NOT EXISTS sys(ID INT PRIMARY KEY AUTO_INCREMENT,message VARCHAR(50))
    '''
    return add_data(query=sql)
    
if __name__ == '__main__':
    print(create_table())
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