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An example of using arrays and $nin with the MongoDB C++ driver
/* Copyright 2009 10gen Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* this is a good first example of how to use mongo from c++
*/
#include <iostream>
#include "client/dbclient.h"
using namespace std;
void insert( mongo::DBClientConnection & conn , const char * name , int num ) {
mongo::BSONObjBuilder obj;
obj.append( "name" , name );
obj.append( "num" , num );
conn.insert( "test.people" , obj.obj() );
}
int main( int argc, const char **argv ) {
const char *port = "27017";
if ( argc != 1 ) {
if ( argc != 3 )
throw -12;
port = argv[ 2 ];
}
mongo::DBClientConnection conn;
string errmsg;
if ( ! conn.connect( string( "127.0.0.1:" ) + port , errmsg ) ) {
cout << "couldn't connect : " << errmsg << endl;
throw -11;
}
{
// clean up old data from any previous tests
mongo::BSONObjBuilder query;
conn.remove( "test.people" , query.obj() );
}
insert( conn, "a", 1 );
insert( conn, "a", 2 );
insert( conn, "a", 3 );
insert( conn, "a", 4 );
insert( conn, "a", 5 );
insert( conn, "a", 6 );
insert( conn, "a", 7 );
insert( conn, "a", 8 );
insert( conn, "a", 9 );
insert( conn, "a", 10 );
{
mongo::BSONObj query = BSON( "num" << BSON( "$nin" << BSON_ARRAY(1 << 5 << 10) ) );
cout << query << endl;
auto_ptr<mongo::DBClientCursor> cursor = conn.query( "test.people" , query );
cout << "using cursor" << endl;
while ( cursor->more() ) {
mongo::BSONObj obj = cursor->next();
cout << "\t" << obj.jsonString() << endl;
}
}
}
@xylcbd

before connected mongodb , "mongo::client::initialize();" is needed , or will be crashed when executing "conn.insert( "test.people" , obj.obj() );".

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