How to insert a buffer that is a char pointer into Mongodb using C++?

Question

I have a buffer i.e a char pointer which has some jSON data itself ,so I want to insert this data into Mongodb.

My approach is,

           char *buff=NULL;
           {buff has some JSON data}

           mongo::BSONObj *obj_data= new mongo::BSONObj(buff) ;
           conn.insert( "mydb.testcollect",obj_data,0);

I am getting this message,

error: no matching function for call to ‘mongo::DBClientConnection::insert(const char [17], mongo::BSONObj*&, int)’

What will be the right approach .plz help.

J Rassi · Accepted Answer · 2016-09-30 16:27:12Z

1

Assuming you are using the latest version of the legacy driver, you should include db/json.h, and then write the following:

try {
    mongo::BSONObj obj = mongo::fromjson(buff);
}
catch (const mongo::MsgAssertionException& exception) {
    // Handle parsing failure.
}
conn.insert("mydb.testcollect", obj);
std::string error = conn.getLastError();
if (!error.empty()) {
    // Handle remote error.
}

If you're starting a new project, then strongly consider using the mongocxx driver (versions 3.0.x and greater of C++ driver series) instead of the legacy driver. The improved API of mongocxx will make writing C++ client code for MongoDB much more intuitive.

answered Sep 30, 2016 at 16:27

J Rassi

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Comments

Andrey · Accepted Answer · 2016-09-29 09:22:23Z

0

Try:

       mongo::BSONObj obj_data(buff) ;
       conn.insert( "mydb.testcollect", obj_data,0);

By the way, you are using outdated driver version. Consider switching to latest one.

answered Sep 29, 2016 at 9:22

Andrey

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3 Comments

Rinku Buragohain Over a year ago

yes now am not getting error at compile time,but at run time am getting this error,"errorThu Sep 29 15:13:23 Assertion: 10334:Invalid BSONObj size: 1919230587

Andrey Over a year ago

@RinkuBuragohain well that is next question. I am not sure you can just feed JSON string to BSONObj constructor. You should check documentation but it is rather vague "Construct a BSONObj from data in the proper format.": api.mongodb.com/cxx-26compat/legacy-0.0-26compat-2.6.0-rc0/…

Andrey Over a year ago

@RinkuBuragohain I would suggest to switching to latest version of driver, it has better structure and docs

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