使用python，pymysql和SSHTunnel查询期间失去与MySQL服务器的连接

Question

我正在使用SSHTunnel连接到Mysql。我打算将所有表从数据集中导出到CSV。这是代码

def OpenSSHTunnel():
    global server
    server = SSHTunnelForwarder(
        ('*.*.*.*', 22),  
        ssh_username="",  
        ssh_pkey="C:/Users/Administrator/Desktop/***",
        remote_bind_address=('*.*.*.*', 3306),
        local_bind_address=('0.0.0.0', 10022))

def exportToCsv(db):
    conn = pymysql.connect(host='127.0.0.1', 
                           port=10022,
                           user='**', 
                           passwd='**',
                           db=db)
    cur = conn.cursor()
    #cur.execute("set global max_allowed_packet=67108864")

    # RETRIEVE TABLES
    cur.execute("SHOW TABLES")
    tables = []
    for row in cur.fetchall():
        tables.append(row[0])

    for t in tables:    
        # SELECT STATEMENTS
        cur.execute("SELECT * FROM `{}`".format(t))
        tempcsv = '{}.csv'.format(t)
        rows = cur.fetchall()

        fp = open(tempcsv, 'w',newline='',encoding='utf-8')
        writer = csv.writer(fp)
        writer.writerow([i[0] for i in cur.description])   # COLUMN HEADERS
        writer.writerows(rows)
        fp.close()

我收到错误消息“ 2013，'在查询过程中失去与MySQL服务器的连接'”，因此有办法解决该问题吗？

我试图设置全局max_allowed_pa​​cket，但是错误“ 1227，'访问被拒绝；您需要（至少一种）此操作的SUPER特权'“