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/* @file dbhelpers.h
db helpers are helper functions and classes that let us easily manipulate the local
database instance in-proc.
*/
/**
* 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/>.
*/
#pragma once
#include "../pch.h"
#include "client.h"
#include "db.h"
namespace mongo {
extern const BSONObj reverseNaturalObj; // {"$natural": -1 }
class Cursor;
class CoveredIndexMatcher;
/**
all helpers assume locking is handled above them
*/
struct Helpers {
/* ensure the specified index exists.
@param keyPattern key pattern, e.g., { ts : 1 }
@param name index name, e.g., "name_1"
This method can be a little (not much) cpu-slow, so you may wish to use
OCCASIONALLY ensureIndex(...);
Note: use ensureHaveIdIndex() for the _id index: it is faster.
Note: does nothing if collection does not yet exist.
*/
static void ensureIndex(const char *ns, BSONObj keyPattern, bool unique, const char *name);
/* fetch a single object from collection ns that matches query.
set your db SavedContext first.
@param query - the query to perform. note this is the low level portion of query so "orderby : ..."
won't work.
@param requireIndex if true, assert if no index for the query. a way to guard against
writing a slow query.
@return true if object found
*/
static bool findOne(const char *ns, const BSONObj &query, BSONObj& result, bool requireIndex = false);
static DiskLoc findOne(const char *ns, const BSONObj &query, bool requireIndex);
/**
* have to be locked already
*/
static vector<BSONObj> findAll( const string& ns , const BSONObj& query );
/**
* @param foundIndex if passed in will be set to 1 if ns and index found
* @return true if object found
*/
static bool findById(Client&, const char *ns, BSONObj query, BSONObj& result ,
bool * nsFound = 0 , bool * indexFound = 0 );
/* uasserts if no _id index.
@return null loc if not found */
static DiskLoc findById(NamespaceDetails *d, BSONObj query);
/** Get/put the first (or last) object from a collection. Generally only useful if the collection
only ever has a single object -- which is a "singleton collection".
You do not need to set the database (Context) before calling.
@return true if object exists.
*/
static bool getSingleton(const char *ns, BSONObj& result);
static void putSingleton(const char *ns, BSONObj obj);
static void putSingletonGod(const char *ns, BSONObj obj, bool logTheOp);
static bool getFirst(const char *ns, BSONObj& result) { return getSingleton(ns, result); }
static bool getLast(const char *ns, BSONObj& result); // get last object int he collection; e.g. {$natural : -1}
/**
* you have to lock
* you do not have to have Context set
* o has to have an _id field or will assert
*/
static void upsert( const string& ns , const BSONObj& o, bool fromMigrate = false );
/** You do not need to set the database before calling.
@return true if collection is empty.
*/
static bool isEmpty(const char *ns, bool doAuth=true);
// TODO: this should be somewhere else probably
static BSONObj toKeyFormat( const BSONObj& o , BSONObj& key );
class RemoveCallback {
public:
virtual ~RemoveCallback() {}
virtual void goingToDelete( const BSONObj& o ) = 0;
};
/**
* Remove all documents in the range.
* Does oplog the individual document deletions.
*/
static long long removeRange( const string& ns ,
const BSONObj& min ,
const BSONObj& max ,
bool yield = false ,
bool maxInclusive = false ,
RemoveCallback * callback = 0,
bool fromMigrate = false );
/**
* Remove all documents from a collection.
* You do not need to set the database before calling.
* Does not oplog the operation.
*/
static void emptyCollection(const char *ns);
};
/**
* user for saving deleted bson objects to a flat file
*/
class RemoveSaver : public Helpers::RemoveCallback , boost::noncopyable {
public:
RemoveSaver( const string& type , const string& ns , const string& why);
~RemoveSaver();
void goingToDelete( const BSONObj& o );
private:
boost::filesystem::path _root;
boost::filesystem::path _file;
ofstream* _out;
};
} // namespace mongo
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