pymysql 本地不抱错 连接云数据库报错

import pymysql

h, pt, u, p, db = 'rm-2zeoye0j3957bw1w2.mysql.rds.aliyuncs.com', 3306, 'tongji_2017', 't3o5N7g7j2I', 'direct_ad'
h, pt, u, p, db = '100.118.74.223', 3306, 'tongji_2017', 't3o5N7g7j2I', 'direct_ad'

h, pt, u, p, db = 'localhost', 3306, 'root', 'root', 'xl_product_DONOT_REMOVE'

def mysql_fetch(sql, res_type='tuple'):
    global h, pt, u, p, db
    try:
        conn = pymysql.connect(host=h, port=pt, user=u, passwd=p, db=db, charset='utf8')
    except Exception as e:
        print(e)
        return ()
    if res_type == 'dic':
        cursor = conn.cursor(pymysql.cursors.DictCursor)
    else:
        cursor = conn.cursor()
    cursor.execute(sql)
    conn.commit()
    cursor.close()
    conn.close()
    return cursor.fetchall()

def mysql_write(sql):
    global h, pt, u, p, db
    try:
        conn = pymysql.connect(host=h, port=pt, user=u, passwd=p, db=db, charset='utf8')
    except Exception as e:
        print(e)
        return 1
    cursor = conn.cursor()
    cursor.execute(sql)
    conn.commit()
    cursor.close()
    conn.close()
    return 0

sql = 'SELECT url FROM ad_direct_order LIMIT 1'
sql = 'SELECT url FROM chk_url_404 LIMIT 1'
d = mysql_fetch(sql)
ff = 0