Python：werkzeug.exceptions.InternalServerError：500 内部服务器错误：'NoneType' object 不可迭代

Question

我已经看到了很多关于这个问题的解决方案，但其中任何一个都解决了我的问题。

我有这个INSERT查询，它包含在 try/except 中，虽然它在数据库中工作正常（数据已正确插入），但调用了 Traceback，代码跳转到 except，查询执行下面的代码是只是被忽略了（在我的情况下不会发生）。

它是这样的：

query = """
  INSERT INTO
    mytable(user_id, tcx_extension, user_email, created_date)
  VALUES
    {}
""".format("('12345678910', '6666', 'test123@test.com', '2020/01/06 00:00:00')")

self.pgsql.execute_query(query)  // the error is triggered here

//important code below that is ignored when the error fires

self.pgsql.execute_query function 如下所示：

def execute_query(self, query, retry=0, format=True):
    if self.pool is None:
        self._open_pool(PGSQL["connection_string"])

    try:
        conn = self.pool.getconn()

        cur = conn.cursor()
        conn.autocommit = True

        LOG.info("Executing query", extra={"query": query})
        cur.execute(query)

        if format is True:
            data = Formatter.format_cursor(cur)
        else:
            data = None
        self.pool.putconn(conn)
        cur.close()

   except pool.PoolError as e:
        LOG.error("PoolError: {}".format(e), extra={"query": query})
        if retry > MAX_RETRIES:
            raise TooManyRetries("Too many retries: {}".format(e))

        LOG.info("Will retry: {}".format(e), extra={"query": query})
        time.sleep(1)
        return self.execute_query(query, retry + 1)

    return data

Traceback 如下图所示：

[2021-01-06 15:28:15,421] ERROR in app: Exception on /members/manage_socket_members [POST]
Traceback (most recent call last):
  File "C:\Users\artur.santos\AppData\Local\Programs\Python\Python37\lib\site-packages\flask\app.py", line 1612, in full_dispatch_request
    rv = self.dispatch_request()
  File "C:\Users\artur.santos\AppData\Local\Programs\Python\Python37\lib\site-packages\flask\app.py", line 1598, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "C:\Users\artur.santos\AppData\Local\Programs\Python\Python37\lib\site-packages\flask_restful\__init__.py", line 480, in wrapper
    resp = resource(*args, **kwargs)
  File "C:\Users\artur.santos\AppData\Local\Programs\Python\Python37\lib\site-packages\flask\views.py", line 84, in view
    return self.dispatch_request(*args, **kwargs)
  File "C:\Users\artur.santos\AppData\Local\Programs\Python\Python37\lib\site-packages\flask_restful\__init__.py", line 595, in dispatch_request
    resp = meth(*args, **kwargs)
  File "C:\Users\artur.santos\Documents\#salesforce\rc-analytics-api\src\decorators\auth.py", line 70, in wrap
    return f(*args, **kwargs)
  File "C:\Users\artur.santos\Documents\#salesforce\rc-analytics-api\src\members\manage_socket_members.py", line 30, in post
    return abort(500, error)
  File "C:\Users\artur.santos\AppData\Local\Programs\Python\Python37\lib\site-packages\werkzeug\exceptions.py", line 707, in abort
    return _aborter(status, *args, **kwargs)
  File "C:\Users\artur.santos\AppData\Local\Programs\Python\Python37\lib\site-packages\werkzeug\exceptions.py", line 687, in __call__
    raise self.mapping[code](*args, **kwargs)
werkzeug.exceptions.InternalServerError: 500 Internal Server Error: 'NoneType' object is not iterable

关于如何解决这个问题的任何想法？

编辑 1：除了created_date之外，所有表字段都是“VARCHAR”类型。

编辑2：当我尝试在双引号之间插入一些值时，错误会发生变化（这对我来说也是一个无意义的错误）。 我不知道是否让我更接近解决方案。 看看我打印的日志

> query: INSERT INTO wfm.socket_user_relation (user_id, tcx_extension, user_email, created_date) VALUES (12345678937, 63, "test37@test.com.br", "2021/01/07 09:25:35")
> exception: column "test37@test.com.br" does not exist
LINE 1: ...ser_email, created_date) VALUES (12345678937, 63, "test37@te...
                                                             ^

编辑 3：如果我尝试INSERT所有双引号，错误保持不变： Error: 500 Internal Server Error: 'NoneType' object is not iterable

Answer 1

您在执行 function 时没有设置format参数，因此它始终为True （正如您在 function 定义中所建立的那样）。

在 PgSQL DB 中成功插入某些内容时的响应是None并且不可能对NoneType Object进行字符串格式化。

只需使用上面的代码，你会没事的。

self.pgsql.execute_query(query, format=False).