Flask使用mysql數據池

helper.py

import pymysql

from settings import Config

def connect():
    conn = Config.POOL.connection()
    cursor = conn.cursor(cursor=pymysql.cursors.DictCursor)  # 以 字典的方式 顯示
    return conn,cursor


def connect_close(conn,cursor):
    cursor.close()
    conn.close()

def fetch_all(sql,args):
    conn,cursor = connect()

    cursor.execute(sql, args)
    record_list = cursor.fetchall()
    connect_close(conn,cursor)

    return record_list


def fetch_one(sql, args):
    conn, cursor = connect()
    cursor.execute(sql, args)
    result = cursor.fetchone()
    connect_close(conn, cursor)

    return result


def insert(sql, args):
    conn, cursor = connect()
    row = cursor.execute(sql, args)
    conn.commit()
    connect_close(conn, cursor)
    return row

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settings.py

from DBUtils.PooledDB import PooledDB, SharedDBConnection
import pymysql
# 下載  DBUtils : pip3 install DBUtils
class Config(object):
    SALT = b"sdf1123df"
    SECRET_KEY = 'asdf123sdfsdfsdf'
    MAX_CONTENT_LENGTH = 1024 * 1024 * 7


    POOL = PooledDB(
        creator=pymysql,  # 使用連接數據庫的模塊
        maxconnections=6,  # 鏈接池容許的最大鏈接數，0和None表示不限制鏈接數
        mincached=2,  # 初始化時，連接池中至少建立的空閒的連接，0表示不建立
        maxcached=5,  # 連接池中最多閒置的連接，0和None不限制
        maxshared=3,
        # 連接池中最多共享的連接數量，0和None表示所有共享。PS: 無用，由於pymysql和MySQLdb等模塊的 threadsafety都爲1，全部值不管設置爲多少，_maxcached永遠爲0，因此永遠是全部連接都共享。
        blocking=True,  # 鏈接池中若是沒有可用鏈接後，是否阻塞等待。True，等待；False，不等待而後報錯
        maxusage=None,  # 一個連接最多被重複使用的次數，None表示無限制
        setsession=[],  # 開始會話前執行的命令列表。如：["set datestyle to ...", "set time zone ..."]
        ping=0,
        # ping MySQL服務端，檢查是否服務可用。# 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='db2',
        charset='utf8'
    )

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views.py

@account.route('/login/', methods=['GET', 'POST'])
def login():
    '''
    登錄
    :return:
    '''
    if request.method == 'GET':
        return render_template('login.html')

    username = request.form.get('user')
    password = request.form.get('pwd')

    pwd_md5 = md5(password)

    data = helper.fetch_one("select id,nickname from userinfo where user=%s and pwd =%s", (username, pwd_md5))

    if not data:
        return render_template('login.html', error='用戶名密碼錯誤')

    # session['user_info'] = data
    session['user_info'] = {'id': data['id'], 'nickname': data['nickname']}

    return redirect('/home/')

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