bool DBClientWithCommands::exists( const string& ns ) {
list<string> names;
string db = nsGetDB( ns ) + ".system.namespaces";
BSONObj q = BSON( "name" << ns );
return count( db.c_str() , q, QueryOption_SlaveOk ) != 0;
}
bool DBClientCursor::initCommand(){
BSONObj res;
bool ok = _client->runCommand( nsGetDB( ns ), query, res, opts );
replyToQuery( 0, *batch.m, res );
dataReceived();
return ok;
}
BSONObj DBClientWithCommands::mapreduce(const string &ns, const string &jsmapf, const string &jsreducef, BSONObj query, MROutput output) {
BSONObjBuilder b;
b.append("mapreduce", nsGetCollection(ns));
b.appendCode("map", jsmapf);
b.appendCode("reduce", jsreducef);
if( !query.isEmpty() )
b.append("query", query);
b.append("out", output.out);
BSONObj info;
runCommand(nsGetDB(ns), b.done(), info);
return info;
}