Question

我想使用与postgres数据库的异步连接来插入实时的数据。我正在使用Twisted进行TCP通信，我正在为txpostgres提供与数据库交互的镜头。当我尝试为异步插入添加回调时，我堆叠了一个奇怪的消息。这是我的代码：

try:
    conn = txpostgres.ConnectionPool(50,params)
    d = conn.start()
    def save_conn(c):
       self.list_cnx.append(c)
       print str(c),"Connect OK"
    def print_err(m):
       print m
   d.addCallbacks(lambda _: save_conn(conn),lambda __: print_err('Connect NO'))
except Exception as e:
    print "Cannot connect to database!!"

我在列表中添加了connction池的引用以供将来查询。

def insert_data(self,dic):
    try:
        insArRq="""INSERT INTO test_pool(date_msg, msg) VALUES ('%s','%s')"""%(dic['date'],dic['msg'])
        for c in self.list_cnx:
            def insert_finich():
                print "insert finich"
            def insert_error():
                print "insert error"
            d = c.runOperation(insArRq) # return a deferred as mentioned in the documentation
            print d # for debug
            d.addCallBack(insert_finich) # error mesage 
    except Exception as ee:
        print "Insert error :  ",ee

当我尝试为runOperation返回的延迟添加回调时，会出现此错误：

<Deferred at 0x8d9782c waiting on Deferred at 0x8d9786c>
Insert error :   Deferred instance has no attribute 'addCallBack'

有时候：

<Deferred at 0x8d97a0c>
Insert error :   Deferred instance has no attribute 'addCallBack'

请帮助我，我是一个新的解决概念，所以我想我错过了什么。谢谢

Answer 1

该方法名为addCallback;案件很重要。

txpostgres：延迟实例没有属性＆＃39; addCallBack＆＃39;

1 个答案: