Question

I am trying to connect to mongodb and insert GET parameters, using G-WAN and mongodb’s C driver, i successfully connecting to mongodb, but i havent succeeded any data inserts.
I am using the code

mongo_write_concern_init(write_concern);
write_concern->w = 0;
mongo_write_concern_finish(write_concern);
bson b[1];
bson_init( b );
bson_append_new_oid( b, "_id" );
bson_append_string( b, "param1", param1);
bson_append_string( b, "param2", param2);

status = mongo_insert( conn, "mydb.mycol", b , write_concern);
bson_finish( b );
bson_destroy( b );
mongo_write_concern_destroy(write_concern);

connection is successfull, i can see it through mongod.log file;

[conn36] run command admin.$cmd { ismaster: 1 }
[conn36] command admin.$cmd command: { ismaster: 1 } ntoreturn:1 reslen:71 0ms
[conn36] end connection 127.0.0.1:50086

but nothing else, i cant get any error messages or error log, also on mongodb shell when i call last errors

> db.getLastError()
null

returns null
any idea why this happens or any solution you can advice is welcome, thank you

Answer 1

This call must be before mongo_insert():

bson_finish( b );

Otherwise you have an unfinished BSON object here:

status = mongo_insert( conn, "mydb.mycol", b , write_concern);

So the code should be

bson b[1];

/// Init
bson_init( b );
bson_append_new_oid( b, "_id" );
bson_append_string( b, "param1", param1);
bson_append_string( b, "param2", param2);

// Make this complete
bson_finish( b );

/// Insert
status = mongo_insert( conn, "mydb.mycol", b , write_concern);

/// Destroy the BSON obj
bson_destroy( b );