python 链接mysql 连接池

# python 链接mysqlimport  mysql.connector.poolingconfig = {    "host":"localhost",    "port": 3306,    "user" : "root",    "password" : "",    "database" : "demo"}try:    pool = mysql.connector.pooling.MySQLConnectionPool(        **config,         pool_size = 10      )    con = pool.get_connection()    con.start_transaction()    cursor = con.cursor()    sql = "UPDATE t_emp set sal = sal + %s where deptno = %s"    cursor.execute(sql,(200, 20))    con.commit()except Exception as e:    if 'con' in dir():        con.rollback    print(e)

来源：https://www.cnblogs.com/ericblog1992/p/11353327.html