/usr/include/mongo/db/dbhelpers.h is in mongodb-dev 1:2.4.9-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 | /* @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 "mongo/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 StringData& ns, const BSONObj &query, BSONObj& result, bool requireIndex = false);
static DiskLoc findOne(const StringData& 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);
// TODO: this should be somewhere else probably
/* Takes object o, and returns a new object with the
* same field elements but the names stripped out.
* Example:
* o = {a : 5 , b : 6} --> {"" : 5, "" : 6}
*/
static BSONObj toKeyFormat( const BSONObj& o );
/* Takes object o, and infers an ascending keyPattern with the same fields as o
* Example:
* o = {a : 5 , b : 6} --> {a : 1 , b : 1 }
*/
static BSONObj inferKeyPattern( const BSONObj& o );
class RemoveCallback {
public:
virtual ~RemoveCallback() {}
virtual void goingToDelete( const BSONObj& o ) = 0;
};
/**
* Takes a range, specified by a min and max, and an index, specified by
* keyPattern, and removes all the documents in that range found by iterating
* over the given index. Caller is responsible for insuring that min/max are
* compatible with the given keyPattern (e.g min={a:100} is compatible with
* keyPattern={a:1,b:1} since it can be extended to {a:100,b:minKey}, but
* min={b:100} is not compatible).
*
* Caller must hold a write lock on 'ns'
*
* Does oplog the individual document deletions.
* // TODO: Refactor this mechanism, it is growing too large
*/
static long long removeRange( const string& ns ,
const BSONObj& min ,
const BSONObj& max ,
const BSONObj& keyPattern ,
bool maxInclusive = false ,
bool secondaryThrottle = false ,
RemoveCallback * callback = 0,
bool fromMigrate = false,
bool onlyRemoveOrphanedDocs = 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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