cx_oracle Python 连接 oracle 执行后台包如何实现请教

如题,后端发来一段代码,我看也没什么问题,但是执行时候偶尔会执行失败,提示找不到订单号,用 plsql 执行就可以获取数据,20 条可能有一条会执行失败,大家有没有更好的建议或者方法 代码如下

try:
    cursor = connection.cursor()
    ad_startdate = datetime.now() - timedelta(days=10)
    ad_enddate = datetime.now()
    mycs = cursor.var(cx_Oracle.CURSOR)
    result = cursor.var(cx_Oracle.NUMBER)
    k = cursor.execute("""begin
      :result := pk_app.uf_get_order_List(as_ic_card => :as_ic_card,
                                              ad_startdate => :ad_startdate,
                                              ad_enddate => :ad_enddate,
                                              mycs => :mycs);
    end;
        """, as_ic_card=as_ic_card, ad_startdate=ad_startdate, ad_enddate=ad_enddate, mycs=mycs,
                       result=result)
    print("----------")
    print(k)
    print("refCursor = mycs.getvalue()")
    refCursor = mycs.getvalue()
    data_list = []
    for row in refCursor:
        print(row)
        data_list.append(row[:])
    cursor.close()
    print (data_list)
except Exception as e:
    print(e)
    try:
        cursor.close()
    except Exception as e1:
        print(e1)

    上面是代码样例,查询最近 10 天订单