mysql连接池

tech2022-08-17  128

先建表

create table users( id int not null auto_increment, name varchar(50) not null, primary key(id))engine=innodb default charset=utf8;

连接池

import time import pymysql import threading from DBUtils.PooledDB import PooledDB, SharedDBConnection class mysqlhelper(object): def __init__(self, host, port, dbuser, password, database): self.pool = PooledDB( creator=pymysql, # 使用链接数据库的模块 maxconnections=6, # 连接池允许的最大连接数,0和None表示不限制连接数 mincached=2, # 初始化时,链接池中至少创建的空闲的链接,0表示不创建 maxcached=5, # 链接池中最多闲置的链接,0和None不限制 maxshared=3, # 链接池中最多共享的链接数量,0和None表示全部共享。 # PS: 无用,因为pymysql和MySQLdb等模块的 threadsafety都为1, # 所有值无论设置为多少,_maxcached永远为0,所以永远是所有链接都共享。 blocking=True, # 连接池中如果没有可用连接后,是否阻塞等待。True,等待;False,不等待然后报错 maxusage=None, # 一个链接最多被重复使用的次数,None表示无限制 setsession=[], # 开始会话前执行的命令列表。如:["set datestyle to ...", "set time zone ..."] ping=0, # ping MySQL服务端,检查是否服务可用。 # # 如:0 = None = never, 1 = default = whenever it is requested, # 2 = when a cursor is created, 4 = when a query is executed, 7 = always host=host, port=int(port), user=dbuser, password=password, database=database, charset='utf8' ) def create_connect_cursor(self): conn = self.pool.connection() cursor = conn.cursor(pymysql.cursors.DictCursor) return conn, cursor def fetch_all(self, sql): conn, cursor = self.create_connect_cursor() cursor.execute(sql) result = cursor.fetchall() cursor.close() conn.close() return result def insert_one(self, sql): conn, cursor = self.create_connect_cursor() res = cursor.execute(sql) conn.commit() print(res) conn.close() return res def update(self, sql): conn, cursor = self.create_connect_cursor() res = cursor.execute(sql) conn.commit() print(res) conn.close() return res sqlhelper = mysqlhelper("127.0.0.1", 3306, "root", "lgd", "test") sqlhelper.insert_one("insert into users(name) VALUES('{}')".format("lgd")) sqlhelper.fetch_all("select * from users where id={}".format(1)) sqlhelper.update("update users set name='{}' WHERE id={}".format("lgd", 1))
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