mongodb C/C++ driver 通过帐号验证登录mongo服务器并进行相应操作

1。C 语言登录mongodb，解决登录失败错误：Authentication failed.: mongoc client_authenticate error

代码如下：

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1. #include <bson.h>
   
2. #include <bcon.h>
   
3. #include <mongoc.h>
   
4. 
   
5. int main (int argc,
   
6.       char *argv[])
   
7. {
   
8.      mongoc_client_t *client;
   
9.      mongoc_database_t *database;
   
10.      mongoc_collection_t *collection;
    
11.      bson_t *command, reply, *insert;
    
12.      bson_error_t error;
    
13.      char *str;
    
14.      bool retval;
    
15. 
    
16.         
    
17.      mongoc_init ();
    
18.      client = mongoc_client_new("mongodb://mydbUser:aaaaaa@localhost:27017/?authSource=mydb");
    
19.      database = mongoc_client_get_database (client, "mydb");
    
20.      collection = mongoc_client_get_collection (client, "mydb", "student");
    
21.      command = BCON_NEW ("ping", BCON_INT32 (1));
    
22.      retval = mongoc_client_command_simple (client, "mydbUser", command, NULL, &reply, &error);
    
23.      if (!retval) {
    
24.          fprintf (stderr, "%s\n", error.message);
    
25.          return EXIT_FAILURE;
    
26.      }
    
27.      str = bson_as_json (&reply, NULL);
    
28.      printf ("%s\n", str);
    
29.      insert = BCON_NEW ("hello", BCON_UTF8 ("world"));
    
30.      if (!mongoc_collection_insert (collection, MONGOC_INSERT_NONE, insert, NULL, &error)) {
    
31.          fprintf (stderr, "%s\n", error.message);
    
32.      }
    
33.      bson_destroy (insert);
    
34.      bson_destroy (&reply);
    
35.      bson_destroy (command);
    
36.      bson_free (str);
    
37. 
    
38.      mongoc_collection_destroy (collection);
    
39.      mongoc_database_destroy (database);
    
40.      mongoc_client_destroy (client);
    
41.      mongoc_cleanup ();
    
42. 
    
43.      return 0;
    
44. }

代码中第18行是登录关键：

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1. client = mongoc_client_new("mongodb://mydbUser:aaaaaa@localhost:27017/?authSource=mydb")

容易看出登录是已uri格式登录的，并可划分成几部分 ：

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1. mongodb://[username:password@]host1[:port1][,host2[:port2],...[,hostN[:portN]]][/[database][?options]]

开始我的登录出错是因为uri格式不对，错误提示：

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1. what(): Authentication failed.: mongoc client_authenticate error

2。C++ 登录mongodb

代码如下：

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1. #include <iostream>
   
2. 
   
3. #include <bsoncxx/builder/stream/document.hpp>
   
4. #include <bsoncxx/json.hpp>
   
5. 
   
6. #include <mongocxx/client.hpp>
   
7. #include <mongocxx/instance.hpp>
   
8. 
   
9. int main(int, char**) {
   
10.     mongocxx::instance inst{};
    
11.     mongocxx::client conn{mongocxx::uri{"mongodb://mydbUser:aaaaaa@localhost:27017/?authSource=mydb"}};
    
12. 
    
13.     bsoncxx::builder::stream::document document{};
    
14. 
    
15.     auto collection = conn["mydb"]["student"];
    
16.     document << "hai!!!" << "world!!!";
    
17. 
    
18.     collection.insert_one(document.view());
    
19.     auto cursor = collection.find({});
    
20. 
    
21.     for (auto&& doc : cursor) {
    
22.         std::cout << bsoncxx::to_json(doc) << std::endl;
    
23.     }
    
24. }

登录成功关键代码是第11行：

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1. mongocxx::client conn{mongocxx::uri{"mongodb://mydbUser:aaaaaa@localhost:27017/?authSource=mydb"}}

说明同C 语言！！

参考链接：

C语言参考：http://api.mongodb.org/c/1.2.0/tutorial.html#connecting
C语言参考2：http://api.mongodb.org/c/1.2.0/
C++参考：https://github.com/mongodb/mongo-cxx-driver/wiki/Quickstart-Guide-(New-Driver)
登录细节参考：https://docs.mongodb.org/manual/reference/connection-string/
登录细节参考2： http://api.mongodb.org/c/current/authentication.html