abstract class that implements the core db operations More...

#include <dbclientinterface.h>

Inheritance diagram for mongo::DBClientBase:

Public Member Functions
virtual std::auto_ptr< DBClientCursor >	query (const std::string &ns, Query query, int nToReturn=0, int nToSkip=0, const BSONObj *fieldsToReturn=0, int queryOptions=0, int batchSize=0)
	send a query to the database.

virtual void	parallelScan (const StringData &ns, int numCursors, std::vector< DBClientCursor * > cursors, stdx::function< DBClientBase ()> connectionFactory)
	Returns a list of up to 'numCursors' cursors that can be iterated concurrently.

virtual unsigned long long	query (stdx::function< void(const BSONObj &)> f, const std::string &ns, Query query, const BSONObj *fieldsToReturn=0, int queryOptions=0)
	Uses QueryOption_Exhaust, when available.

virtual std::auto_ptr< DBClientCursor >	getMore (const std::string &ns, long long cursorId, int nToReturn=0, int options=0)
	don't use this - called automatically by DBClientCursor for you

virtual void	insert (const std::string &ns, BSONObj obj, int flags=0, const WriteConcern *wc=NULL)
	insert an object into the database

virtual void	insert (const std::string &ns, const std::vector< BSONObj > &v, int flags=0, const WriteConcern *wc=NULL)
	insert a vector of objects into the database

virtual void	update (const std::string &ns, Query query, BSONObj obj, bool upsert=false, bool multi=false, const WriteConcern *wc=NULL)
	updates objects matching query

BSONObj	findAndModify (const StringData &ns, const BSONObj &query, const BSONObj &update, bool upsert=false, bool returnNew=false, const BSONObj &sort=BSONObj(), const BSONObj &fields=BSONObj(), const WriteConcern *wc=NULL, bool bypassDocumentValidation=false)
	Modifies and returns a single document.

BSONObj	findAndRemove (const StringData &ns, const BSONObj &query, const BSONObj &sort=BSONObj(), const BSONObj &fields=BSONObj(), const WriteConcern *wc=NULL)
	Removes and returns a single document.

virtual BulkOperationBuilder	initializeUnorderedBulkOp (const std::string &ns)
	Initializes an unordered bulk operation by returning an object that can be used to enqueue multiple operations for batch execution.

virtual BulkOperationBuilder	initializeOrderedBulkOp (const std::string &ns)
	Initializes an ordered bulk operation by returning an object that can be used to enqueue multiple operations for batch execution.

virtual void	remove (const std::string &ns, Query q, bool justOne=0, const WriteConcern *wc=NULL)
	remove matching objects from the database

virtual bool	isStillConnected ()=0
	if not checked recently, checks whether the underlying socket/sockets are still valid

Public Member Functions inherited from mongo::DBClientWithCommands
bool	simpleCommand (const std::string &dbname, BSONObj *info, const std::string &command)
	helper function.

virtual bool	runCommand (const std::string &dbname, const BSONObj &cmd, BSONObj &info, int options=0)
	Run a database command.

void	auth (const BSONObj &params)
	Authenticate a user.

bool	auth (const std::string &dbname, const std::string &username, const std::string &pwd, std::string &errmsg, bool digestPassword=true)
	Authorize access to a particular database.

virtual void	logout (const std::string &dbname, BSONObj &info)
	Logs out the connection for the given database.

virtual unsigned long long	count (const std::string &ns, const Query &query=Query(), int options=0, int limit=0, int skip=0)
	count number of objects in collection ns that match the query criteria specified throws UserAssertion if database returns an error

virtual bool	isMaster (bool &isMaster, BSONObj *info=0)
	returns true in isMaster parm if this db is the current master of a replica pair.

bool	createCollection (const std::string &ns, long long size=0, bool capped=false, int max=0, BSONObj *info=0)
	Create a new collection in the database.

bool	createCollectionWithOptions (const std::string &ns, long long size=0, bool capped=false, int max=0, const BSONObj &extraOptions=BSONObj(), BSONObj *info=0)
	Creates a new collection in the database.

std::string	getLastError (const std::string &db, bool fsync=false, bool j=false, int w=0, int wtimeout=0)
	Get error result from the last write operation (insert/update/delete) on this connection.

std::string	getLastError (bool fsync=false, bool j=false, int w=0, int wtimeout=0)
	Same as the form of getLastError that takes a dbname, but just uses the admin DB.

virtual BSONObj	getLastErrorDetailed (const std::string &db, bool fsync=false, bool j=false, int w=0, int wtimeout=0)
	Get error result from the last write operation (insert/update/delete) on this connection.

virtual BSONObj	getLastErrorDetailed (bool fsync=false, bool j=false, int w=0, int wtimeout=0)
	Same as the form of getLastErrorDetailed that takes a dbname, but just uses the admin DB.

BSONObj	getPrevError ()
	Return the last error which has occurred, even if not the very last operation.

bool	resetError ()
	Reset the previous error state for this connection (accessed via getLastError and getPrevError).

virtual bool	dropCollection (const std::string &ns, BSONObj *info=NULL)
	Delete the specified collection.

bool	repairDatabase (const std::string &dbname, BSONObj *info=0)
	Perform a repair and compaction of the specified database.

bool	copyDatabase (const std::string &fromdb, const std::string &todb, const std::string &fromhost="", const std::string &mechanism="DEFAULT", const std::string &username="", const std::string &password="", BSONObj *info=0)
	Copy database from one server or name to another server or name.

BSONObj	mapreduce (const std::string &ns, const std::string &jsmapf, const std::string &jsreducef, Query query=Query(), MROutput output=MRInline)
	Run a map/reduce job on the server.

void	group (const StringData &ns, const StringData &jsreduce, std::vector< BSONObj > *output, const BSONObj &initial=BSONObj(), const Query &query=Query(), const BSONObj &key=BSONObj(), const StringData &finalize="")
	Groups documents in a collection by the specified key and performs simple aggregation functions such as computing counts and sums.

void	groupWithKeyFunction (const StringData &ns, const StringData &jsreduce, std::vector< BSONObj > *output, const BSONObj &initial=BSONObj(), const Query &query=Query(), const StringData &jskey="", const StringData &finalize="")
	Does the same thing as 'group' but accepts a key function, 'jskey', that is used to create an object representing the key.

BSONObj	distinct (const StringData &ns, const StringData &field, const Query &query=Query())
	Finds the distinct values for a specified field across a single collection and returns the results in an array.

bool	eval (const std::string &dbname, const std::string &jscode, BSONObj &info, BSONElement &retValue, BSONObj *args=0, bool nolock=false)
	Run javascript code on the database server.

bool	validate (const std::string &ns, bool scandata=true)
	validate a collection, checking for errors and reporting back statistics.

template<class T , class NumType >
	MONGO_CLIENT_DEPRECATED ("deprecated in MongoDB 3.0") bool eval(const std
	eval invocation with one parm to server and one numeric field (either int or double) returned

std::list< std::string >	getDatabaseNames ()
	get a list of all the current databases uses the { listDatabases : 1 } command.

std::list< std::string >	getCollectionNames (const std::string &db, const BSONObj &filter=BSONObj())
	Get a list of all the current collections in db.

std::list< BSONObj >	getCollectionInfos (const std::string &db, const BSONObj &filter=BSONObj())
	{ name : "<short collection name>", options : { } }

std::auto_ptr< DBClientCursor >	enumerateCollections (const std::string &db, const BSONObj &filter=BSONObj(), int batchSize=0)
	Returns a DBClientCursor with collection information objects.

void	createIndex (const StringData &ns, const BSONObj &keys)
	Create an index on the collection 'ns' as described by the given keys.

virtual void	createIndex (const StringData &ns, const IndexSpec &descriptor)
	Create an index on the collection 'ns' as described by the given descriptor.

virtual std::list< std::string >	getIndexNames (const std::string &ns, int options=0)
	Enumerates all indexes on ns (a db-qualified collection name).

virtual void	dropIndexes (const std::string &ns)
	drops all indexes for the collection

virtual bool	dropDatabase (const std::string &dbname, BSONObj *info=0)
	Erase / drop an entire database.

Public Member Functions inherited from mongo::DBClientInterface
virtual BSONObj	findOne (const std::string &ns, const Query &query, const BSONObj *fieldsToReturn=0, int queryOptions=0)

void	findN (std::vector< BSONObj > &out, const std::string &ns, Query query, int nToReturn, int nToSkip=0, const BSONObj *fieldsToReturn=0, int queryOptions=0, int batchSize=0)
	query N objects from the database into an array.

void	save (const StringData &ns, const BSONObj &toSave, const WriteConcern *wc=NULL)
	Saves a document to a collection.

virtual std::auto_ptr< DBClientCursor >	getMore (const std::string &ns, long long cursorId, int nToReturn=0, int options=0)=0
	don't use this - called automatically by DBClientCursor for you

Public Member Functions inherited from mongo::DBConnector
virtual bool	call (Message &toSend, Message &response, bool assertOk=true, std::string *actualServer=0)=0
	actualServer is set to the actual server where they call went if there was a choice (SlaveOk)

Additional Inherited Members
Public Types inherited from mongo::DBClientWithCommands
enum	ProfilingLevel
	The Mongo database provides built-in performance profiling capabilities. More...

typedef stdx::function< void(BSONObjBuilder *)>	RunCommandHookFunc
	A function type for runCommand hooking; the function takes a pointer to a BSONObjBuilder and returns nothing.

typedef stdx::function< void(const BSONObj &, const std::string &)>	PostRunCommandHookFunc
	Similar to above, but for running a function on a command response after a command has been run.

Static Public Member Functions inherited from mongo::DBClientWithCommands
static std::string MONGO_CLIENT_FUNC	getLastErrorString (const BSONObj &res)
	Can be called with the returned value from getLastErrorDetailed to extract an error string.

Public Attributes inherited from mongo::DBClientWithCommands
logger::LogSeverity	_logLevel
	controls how chatty the client is about network errors & such.

Protected Member Functions inherited from mongo::DBClientWithCommands
bool	isOk (const BSONObj &)
	if the result of a command is ok

bool	isNotMasterErrorString (const BSONElement &e)
	if the element contains a not master error

QueryOptions	availableOptions ()
	Look up the options available on this client.

bool	_authMongoCR (const std::string &dbname, const std::string &username, const std::string &pwd, BSONObj *info, bool digestPassword)
	Use the MONGODB-CR protocol to authenticate as "username" against the database "dbname", with the given password.

bool	_authX509 (const std::string &dbname, const std::string &username, BSONObj *info)
	Use the MONGODB-X509 protocol to authenticate as "username.

Protected Attributes inherited from mongo::DBClientWithCommands
RunCommandHookFunc	_runCommandHook
	These functions will be executed by the driver on runCommand calls.

Detailed Description

abstract class that implements the core db operations

Member Function Documentation

◆ findAndModify()

BSONObj mongo::DBClientBase::findAndModify	(	const StringData &	ns,
		const BSONObj &	query,
		const BSONObj &	update,
		bool	upsert = `false`,
		bool	returnNew = `false`,
		const BSONObj &	sort = `BSONObj()`,
		const BSONObj &	fields = `BSONObj()`,
		const WriteConcern *	wc = `NULL`,
		bool	bypassDocumentValidation = `false`
	)

Modifies and returns a single document.

Note: By default, the returned document does not include modifications made on update.

Parameters

ns	Namespace on which to perform this findAndModify.
update	Update document to be applied.
query	Filter for the update.
upsert	Insert if object does not exist.
sort	Sort for the filter.
new	Return the updated rather than original object.
fields	Fields to return. Specifies inclusion with 1, "{<field1>: 1, ...}"
wc	The write concern for this operation.

◆ findAndRemove()

BSONObj mongo::DBClientBase::findAndRemove	(	const StringData &	ns,
		const BSONObj &	query,
		const BSONObj &	sort = `BSONObj()`,
		const BSONObj &	fields = `BSONObj()`,
		const WriteConcern *	wc = `NULL`
	)

Removes and returns a single document.

Note: By default, the returned document does not include modifications made on update.

Parameters

ns	Namespace on which to perform this findAndModify.
query	Filter for the update.
sort	Sort for the filter.
fields	Fields to return. Specifies inclusion with 1, "{<field1>: 1, ...}"
wc	The write concern for this operation.

◆ getMore()

virtual std::auto_ptr< DBClientCursor > mongo::DBClientBase::getMore	(	const std::string &	ns,
		long long	cursorId,
		int	nToReturn = `0`,
		int	options = `0`
	)

virtual

don't use this - called automatically by DBClientCursor for you

Parameters

cursorId id of cursor to retrieve

Returns: an handle to a previously allocated cursor

Exceptions

AssertionException

Implements mongo::DBClientInterface.

◆ initializeOrderedBulkOp()

virtual BulkOperationBuilder mongo::DBClientBase::initializeOrderedBulkOp ( const std::string & ns )

virtual

Initializes an ordered bulk operation by returning an object that can be used to enqueue multiple operations for batch execution.

Parameters

ns	Namespace on which to apply the operations.

See also: BulkOperationBuilder

◆ initializeUnorderedBulkOp()

virtual BulkOperationBuilder mongo::DBClientBase::initializeUnorderedBulkOp ( const std::string & ns )

virtual

Initializes an unordered bulk operation by returning an object that can be used to enqueue multiple operations for batch execution.

Parameters

ns	Namespace on which to apply the operations.

See also: BulkOperationBuilder

◆ parallelScan()

virtual void mongo::DBClientBase::parallelScan	(	const StringData &	ns,
		int	numCursors,
		std::vector< DBClientCursor * > *	cursors,
		stdx::function< DBClientBase *()>	connectionFactory
	)

virtual

Returns a list of up to 'numCursors' cursors that can be iterated concurrently.

As long as the collection is not modified during scanning, each document appears once in one of the cursors' result sets.

Note: Warning: One must delete the cursors after use.; Warning: One must delete any new connections created by the connection factory after use.

See also: example usage in dbclient_test.cpp -> DBClientTest/ParallelCollectionScan

Parameters

ns	The namespace to scan
numCursors	Number of cursors to return. You may get back less than you asked for.
cursors	Output vector to hold cursors created for this scan.
connectionFactory	Function that returns a pointer to a DBClientBase for use by newly created cursors. The function takes zero parameters but additional parameters may be bound (if required) using std::bind. See the example listed above for more info.

◆ query() [1/2]

virtual std::auto_ptr< DBClientCursor > mongo::DBClientBase::query	(	const std::string &	ns,
		Query	query,
		int	nToReturn = `0`,
		int	nToSkip = `0`,
		const BSONObj *	fieldsToReturn = `0`,
		int	queryOptions = `0`,
		int	batchSize = `0`
	)

virtual

send a query to the database.

Parameters

ns	namespace to query, format is <dbname>.<collectname>[.<collectname>]*
query	query to perform on the collection. this is a BSONObj (binary JSON) You may format as { query: { ... }, orderby: { ... } } to specify a sort order.
nToReturn	n to return (i.e., limit). 0 = unlimited
nToSkip	start with the nth item
fieldsToReturn	optional template of which fields to select. if unspecified, returns all fields
queryOptions	see options enum at top of this file

Returns: cursor. 0 if error (connection failure)

Exceptions

AssertionException

Implements mongo::DBClientInterface.

Reimplemented in mongo::DBClientReplicaSet, mongo::DBClientReplicaSet, mongo::DBClientConnection, and mongo::DBClientConnection.

◆ query() [2/2]

virtual unsigned long long mongo::DBClientBase::query	(	stdx::function< void(const BSONObj &)>	f,
		const std::string &	ns,
		Query	query,
		const BSONObj *	fieldsToReturn = `0`,
		int	queryOptions = `0`
	)

virtual

Uses QueryOption_Exhaust, when available.

Exhaust mode sends back all data queries as fast as possible, with no back-and-forth for OP_GETMORE. If you are certain you will exhaust the query, it could be useful.

Use the DBClientCursorBatchIterator version, below, if you want to do items in large blocks, perhaps to avoid granular locking and such.

Reimplemented in mongo::DBClientReplicaSet, and mongo::DBClientConnection.