any_connection

(EXPERIMENTAL) A type-erased connection to a MySQL server.

Synopsis

Defined in header <boost/mysql/any_connection.hpp>

class any_connection

Types

Name	Description
executor_type	The executor type associated to this object.

Member Functions

Name	Description
any_connection [constructor]	Constructs a connection object from an executor and an optional set of parameters. — Constructs a connection object from an execution context and an optional set of parameters. — Move constructor.
async_close	Cleanly closes the connection to the server. — Cleanly closes the connection to the server.
async_close_statement	Closes a statement, deallocating it from the server. — Closes a statement, deallocating it from the server.
async_connect	Establishes a connection to a MySQL server. — Establishes a connection to a MySQL server.
async_execute	Executes a text query or prepared statement. — Executes a text query or prepared statement.
async_ping	Checks whether the server is alive. — Checks whether the server is alive.
async_prepare_statement	Prepares a statement server-side. — Prepares a statement server-side.
async_read_resultset_head	Reads metadata for subsequent resultsets in a multi-resultset operation. — Reads metadata for subsequent resultsets in a multi-resultset operation.
async_read_some_rows	Reads a batch of rows. — Reads a batch of rows. — Reads a batch of rows.
async_reset_connection	Resets server-side session state, like variables and prepared statements. — Resets server-side session state, like variables and prepared statements.
async_set_character_set	Sets the connection's character set, as per SET NAMES. — Sets the connection's character set, as per SET NAMES.
async_start_execution	Starts a SQL execution as a multi-function operation. — Starts a SQL execution as a multi-function operation.
backslash_escapes	Returns whether backslashes are being treated as escape sequences.
close	Cleanly closes the connection to the server. — Cleanly closes the connection to the server.
close_statement	Closes a statement, deallocating it from the server. — Closes a statement, deallocating it from the server.
connect	Establishes a connection to a MySQL server. — Establishes a connection to a MySQL server.
current_character_set	Returns the character set used by this connection.
execute	Executes a text query or prepared statement. — Executes a text query or prepared statement.
format_opts	Returns format options suitable to format SQL according to the current connection configuation.
get_executor	Retrieves the executor associated to this object.
meta_mode	Returns the current metadata mode that this connection is using.
operator=	Move assignment.
ping	Checks whether the server is alive. — Checks whether the server is alive.
prepare_statement	Prepares a statement server-side. — Prepares a statement server-side.
read_resultset_head	Reads metadata for subsequent resultsets in a multi-resultset operation. — Reads metadata for subsequent resultsets in a multi-resultset operation.
read_some_rows	Reads a batch of rows. — Reads a batch of rows. — Reads a batch of rows.
reset_connection	Resets server-side session state, like variables and prepared statements. — Resets server-side session state, like variables and prepared statements.
set_character_set	Sets the connection's character set, as per SET NAMES. — Sets the connection's character set, as per SET NAMES.
set_meta_mode	Sets the metadata mode.
start_execution	Starts a SQL execution as a multi-function operation. — Starts a SQL execution as a multi-function operation.
uses_ssl	Returns whether the connection negotiated the use of SSL or not.
~any_connection [destructor]	Destructor.

Description

Represents a connection to a MySQL server. Compared to connection, this class:

Is type-erased. The type of the connection doesn't depend on the transport being used. Supported transports include plaintext TCP, SSL over TCP and UNIX domain sockets.
Is easier to connect, as connect and async_connect handle hostname resolution.
Can always be re-connected after being used or encountering an error.
Doesn't support default completion tokens.

Provides a level of performance similar to connection.

This is a move-only type.

Thread safety

Distinct objects: safe.

Shared objects: unsafe.

This class is not thread-safe: for a single object, if you call its member functions concurrently from separate threads, you will get a race condition.

Experimental

This part of the API is experimental, and may change in successive releases without previous notice.