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// dbhelpers.cpp
/**
* Copyright (C) 2008 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "stdafx.h"
#include "db.h"
#include "dbhelpers.h"
#include "query.h"
/* Get the first object from a collection. Generally only useful if the collection
only ever has a single object -- which is a "singleton collection.
Returns: true if object exists.
*/
bool getSingleton(const char *ns, BSONObj& result) {
DBContext context(ns);
auto_ptr<Cursor> c = DataFileMgr::findAll(ns);
if ( !c->ok() )
return false;
result = c->current();
return true;
}
void putSingleton(const char *ns, BSONObj obj) {
DBContext context(ns);
stringstream ss;
updateObjects(ns, obj, /*pattern=*/emptyObj, /*upsert=*/true, ss);
}
void emptyCollection(const char *ns) {
DBContext context(ns);
deleteObjects(ns, emptyObj, false);
}
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