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