Question

mongodb://USER:SECRET@appname-shard-00-00-tlxyp.mongodb.net:27017,appname-shard-00-01-tlxyp.mongodb.net:27017,appname-shard-00-02-tlxyp.mongodb.net:27017/test?ssl=true&replicaSet=appname-shard-0&authSource=admin

参数：

URI：scoringSystem
收藏：/home/myUser/IdeaProjects/app/scoring-system.json
文件：[1] 23452 [2] 23453 2017-10-17T20:00:28.633+0200 no collection specified 2017-10-17T20:00:28.633+0200 using filename '' as collection 2017-10-17T20:00:28.633+0200 error validating settings: invalid collection name: collection name cannot be an empty string 2017-10-17T20:00:28.633+0200 try 'mongoimport --help' for more information --collection: command not found [1]- Exit 1 mongoimport --uri mongodb://(...output omitted...)?ssl=true [2]+ Done replicaSet=Wamsteady-shard-0

这导致：

mongoimport --version

mongoimport version: r3.4.9
git version: 876ebee8c7dd0e2d992f36a848ff4dc50ee6603e
Go version: go1.7
   os: linux
   arch: amd64
   compiler: gc
OpenSSL version: OpenSSL 1.0.2g  1 Mar 2016

我不明白mongoimport如何找不到命令“--collection”，因为它是documented here的有效参数。

有什么问题？

#include <string>
#include <functional>
#include <iostream>

struct WrapperHelp
{
   template
      <  typename L
      ,  typename Tuple
      ,  std::size_t... Is
      ,  typename... Ts
      >
   static auto apply(L&& l, Tuple t, std::index_sequence<Is...>, Ts&&... ts)
      -> decltype(l(std::get<Is>(t)...))
   {
      return l(std::get<Is>(t)...);
   }

   template
      <  typename L
      ,  typename Tuple
      ,  std::size_t... Is
      ,  typename T1
      ,  typename... Ts
      >
   static auto apply(L&& l, Tuple t, std::index_sequence<Is...>, T1&& t1, Ts&&... ts)
      -> decltype(WrapperHelp::apply(std::forward<L>(l), std::forward_as_tuple(std::get<Is>(t)..., t1), std::make_index_sequence<sizeof...(Is) +1 >(), ts...))
   {
      return WrapperHelp::apply(std::forward<L>(l), std::forward_as_tuple(std::get<Is>(t)..., t1), std::make_index_sequence<sizeof...(Is) + 1>(), ts...);
   }
};

template<typename L>
struct OptionalWrapper {
   public:
      OptionalWrapper(L l) : lambda{std::move(l)} {}

      template<typename... Ts>
      void operator()(Ts&&... ts) const
      {
         WrapperHelp::apply(lambda, std::tuple<>(), std::index_sequence<>(), std::forward<Ts>(ts)...);
      }

   private:
      L lambda;
};

template<typename L>
auto makeOptionalWrapper(L l) { return OptionalWrapper<L>{std::move(l)}; }

template<class F>
void loadData(OptionalWrapper<F>&& callback)
{
   std::string body = "body";
   std::string subject = "subject";
   std::string header = "header";
   double lol  = 2.0;
   callback(body, subject, header, lol);
}

template<typename L>
void loadData(L callback)
{
    loadData(makeOptionalWrapper(std::move(callback)));
}

int main() {
   //apply(std::tuple<double>(2), std::tuple<double>(2));
   loadData([](auto&& body) { 
      std::cout << body << std::endl;
   });
   loadData([](auto&& body, auto&& subject) { 
      std::cout << body << " " << subject << std::endl;
   });
   loadData([](auto&& body, auto&& subject, auto&& header) { 
      std::cout << body << " " << subject << " " << header << std::endl;
   });
   loadData([](auto&& body, auto&& subject, auto&& header, auto&& lol) { 
      std::cout << body << " " << subject << " " << header << " " << lol << std::endl;
   });
   return 0;
}

Answer 1

您必须引用uri参数。它包含一个&，由您在mongoimport中运行的任何内容解释。

所以，替换这个......

mongoimport --uri mongodb://USER:SECRET@appname-shard-00-00-tlxyp.mongodb.net:27017,appname-shard-00-01-tlxyp.mongodb.net:27017,appname-shard-00-02-tlxyp.mongodb.net:27017/test?ssl=true&replicaSet=appname-shard-0&authSource=admin --collection scoringSystem --file /home/myUser/IdeaProjects/app/scoring-system.json

......用这个：

mongoimport --uri "mongodb://USER:SECRET@appname-shard-00-00-tlxyp.mongodb.net:27017,appname-shard-00-01-tlxyp.mongodb.net:27017,appname-shard-00-02-tlxyp.mongodb.net:27017/test?ssl=true&replicaSet=appname-shard-0&authSource=admin" --collection scoringSystem --file /home/myUser/IdeaProjects/app/scoring-system.json

尽管已定义了集合，但Mongoimport导致“未指定集合”

1 个答案: