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

转载：http://blog.chinaunix.net/uid-29454152-id-5587541.html

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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#include <bson.h>
#include <bcon.h>
#include <mongoc.h>

int main (int argc,
      char *argv[])
{
     mongoc_client_t *client;
     mongoc_database_t *database;
     mongoc_collection_t *collection;
     bson_t *command, reply, *insert;
     bson_error_t error;
     char *str;
     bool retval;


     mongoc_init ();
     client = mongoc_client_new("mongodb://mydbUser:aaaaaa@localhost:27017/?authSource=mydb");
     database = mongoc_client_get_database (client, "mydb");
     collection = mongoc_client_get_collection (client, "mydb", "student");
     command = BCON_NEW ("ping", BCON_INT32 (1));
     retval = mongoc_client_command_simple (client, "mydbUser", command, NULL, &reply, &error);
     if (!retval) {
         fprintf (stderr, "%s
", error.message);
         return EXIT_FAILURE;
     }
     str = bson_as_json (&reply, NULL);
     printf ("%s
", str);
     insert = BCON_NEW ("hello", BCON_UTF8 ("world"));
     if (!mongoc_collection_insert (collection, MONGOC_INSERT_NONE, insert, NULL, &error)) {
         fprintf (stderr, "%s
", error.message);
     }
     bson_destroy (insert);
     bson_destroy (&reply);
     bson_destroy (command);
     bson_free (str);

     mongoc_collection_destroy (collection);
     mongoc_database_destroy (database);
     mongoc_client_destroy (client);
     mongoc_cleanup ();

     return 0;
}

代码中第18行是登录关键：

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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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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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what(): Authentication failed.: mongoc client_authenticate error

2。C++ 登录mongodb

代码如下：

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#include <iostream>

#include <bsoncxx/builder/stream/document.hpp>
#include <bsoncxx/json.hpp>

#include <mongocxx/client.hpp>
#include <mongocxx/instance.hpp>

int main(int, char**) {
    mongocxx::instance inst{};
    mongocxx::client conn{mongocxx::uri{"mongodb://mydbUser:aaaaaa@localhost:27017/?authSource=mydb"}};

    bsoncxx::builder::stream::document document{};

    auto collection = conn["mydb"]["student"];
    document << "hai!!!" << "world!!!";

    collection.insert_one(document.view());
    auto cursor = collection.find({});

    for (auto&& doc : cursor) {
        std::cout << bsoncxx::to_json(doc) << std::endl;
    }
}

登录成功关键代码是第11行：

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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：
C语言参考2：
C++参考：(New-Driver)
登录细节参考：
登录细节参考2： http://api.mongodb.org/c/current/authentication.html