Class representing a client connection to MongoDB. More...

#include <client.hpp>

Public Member Functions
	client () noexcept
	Default constructs a new client. More...

	client (const class uri &mongodb_uri, const options::client &options=options::client())
	Creates a new client connection to MongoDB. More...

	client (client &&) noexcept
	Move constructs a client.

client &	operator= (client &&) noexcept
	Move assigns a client.

	~client ()
	Destroys a client.

	operator bool () const noexcept
	Returns true if the client is valid, meaning it was not default constructed or moved from.

void	read_concern (class read_concern rc)
	Sets the read concern for this client. More...

class read_concern	read_concern () const
	Returns the current read concern for this client. More...

void	read_preference (class read_preference rp)
	Sets the read preference for this client. More...

class read_preference	read_preference () const
	Returns the current read preference for this client. More...

class uri	uri () const
	Returns the current uri for this client. More...

void	write_concern (class write_concern wc)
	Sets the write concern for this client. More...

class write_concern	write_concern () const
	Returns the current write concern for this client. More...

class database	database (bsoncxx::string::view_or_value name) const &
	Obtains a database that represents a logical grouping of collections on a MongoDB server. More...

class database	operator[] (bsoncxx::string::view_or_value name) const &
	Allows the syntax `client`["db_name"] as a convenient shorthand for the client::database() method by implementing the array subscript operator. More...

cursor	list_databases () const
	Enumerates the databases in the client. More...

Detailed Description

Class representing a client connection to MongoDB.

Acts as a logical gateway for working with databases contained within a MongoDB server.

Databases that are created via this client inherit the read_concern, read_preference, and write_concern settings of this client when they are created. The lifetimes of objects created via a client object (databases, collections, cursors, etc...) must be a subset of the lifetime of the client that created them.

Example:

mongocxx::client mongo_client;

mongocxx::client mongo_client("mongodb://localhost:27017");

Constructor & Destructor Documentation

mongocxx::client::client ( )

noexcept

Default constructs a new client.

The client is not connected and is equivalent to the state of a moved-from client. The only valid actions to take with a default constructed 'client' are to assign to it, or destroy it.

mongocxx::client::client	(	const class uri &	mongodb_uri,
		const options::client &	options = `options::client()`
	)

Creates a new client connection to MongoDB.

Parameters

mongodb_uri	A MongoDB URI representing the connection parameters
options	Additional options that cannot be specified via the mongodb_uri

Exceptions

mongocxx::exception if invalid options are provided (whether from the URI or provided client options).

Member Function Documentation

class database mongocxx::client::database ( bsoncxx::string::view_or_value name ) const

Obtains a database that represents a logical grouping of collections on a MongoDB server.

Note: A database cannot be obtained from a temporary client object.

Parameters

name	The name of the database to get

Returns: The database

cursor mongocxx::client::list_databases ( ) const

Enumerates the databases in the client.

Returns: A mongocxx::cursor containing a BSON document for each database. Each document contains a name field with the database name, a sizeOnDisk field with the total size of the database file on disk in bytes, and an empty field specifying whether the database has any data.

Exceptions

mongocxx::operation_exception if the underlying 'listDatabases' command fails.

See also: https://docs.mongodb.com/master/reference/command/listDatabases

database mongocxx::client::operator[] ( bsoncxx::string::view_or_value name ) const

Allows the syntax client["db_name"] as a convenient shorthand for the client::database() method by implementing the array subscript operator.

Note: A database cannot be obtained from a temporary client object.

Parameters

name	The name of the database.

Returns: Client side representation of a server side database

class read_concern mongocxx::client::read_concern ( ) const

Returns the current read concern for this client.

Returns: The current read_concern

void mongocxx::client::read_concern ( class read_concern rc )

Sets the read concern for this client.

Modifications at this level do not affect existing database instances that have been created by this client but do affect new ones as databases inherit the read_concern settings of their parent upon instantiation.

Parameters

rc	The new `read_concern`

See also: https://docs.mongodb.com/master/reference/read-concern/

class read_preference mongocxx::client::read_preference ( ) const

Returns the current read preference for this client.

Returns: The current read_preference

See also: https://docs.mongodb.com/master/core/read-preference/

void mongocxx::client::read_preference ( class read_preference rp )

Sets the read preference for this client.

Modifications at this level do not affect existing database instances that have been created by this client but do affect new ones as databases inherit the read_preference settings of their parent upon instantiation.

Parameters

rp	The new `read_preference`

See also: https://docs.mongodb.com/master/core/read-preference/

class uri mongocxx::client::uri ( ) const

Returns the current uri for this client.

Returns: The uri that this client was created with.

void mongocxx::client::write_concern ( class write_concern wc )

Sets the write concern for this client.

Note: Modifications at this level do not affect existing databases or collection instances that have come from this client but do affect new ones as databases will receive a copy of this client's write_concern upon instantiation.

Parameters

wc	The new write concern

class write_concern mongocxx::client::write_concern ( ) const

Returns the current write concern for this client.

Returns: the current write_concern

The documentation for this class was generated from the following file:

src/mongocxx/client.hpp

Public Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation