一、配置

1.1 setting.py

from datetime import timedelta
from redis import Redis
import pymysql
from DBUtils.PooledDB import PooledDB, SharedDBConnection

class Config(object):
    DEBUG = True
    SECRET_KEY = "umsuldfsdflskjdf"
    PERMANENT_SESSION_LIFETIME = timedelta(minutes=20)
    SESSION_REFRESH_EACH_REQUEST= True
    SESSION_TYPE = "redis"
    PYMYSQL_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='127.0.0.1',
        port=3306,
        user='root',
        password='123456',
        database='s8day127db',
        charset='utf8'
    )

class ProductionConfig(Config):
    SESSION_REDIS = Redis(host='192.168.0.94', port='6379')



class DevelopmentConfig(Config):
    SESSION_REDIS = Redis(host='127.0.0.1', port='6379')


class TestingConfig(Config):
    pass

1.2 utils/sql.py

import pymysql
from settings import Config
class SQLHelper(object):

    @staticmethod
    def open(cursor):
        POOL = Config.PYMYSQL_POOL
        conn = POOL.connection()
        cursor = conn.cursor(cursor=cursor)
        return conn,cursor

    @staticmethod
    def close(conn,cursor):
        conn.commit()
        cursor.close()
        conn.close()

    @classmethod
    def fetch_one(cls,sql,args,cursor =pymysql.cursors.DictCursor):
        conn,cursor = cls.open(cursor)
        cursor.execute(sql, args)
        obj = cursor.fetchone()
        cls.close(conn,cursor)
        return obj

    @classmethod
    def fetch_all(cls,sql, args,cursor =pymysql.cursors.DictCursor):
        conn, cursor = cls.open(cursor)
        cursor.execute(sql, args)
        obj = cursor.fetchall()
        cls.close(conn, cursor)
        return obj

二、使用

obj = SQLHelper.fetch_one("select id,name from users where name=%(user)s and pwd=%(pwd)s", form.data)

原文地址：https://www.cnblogs.com/wangyong123/p/11830492.html