A simple holder for the Prepared Statement Query_arena instance in THD. More...

#include <thd_raii.h>

Public Member Functions
	Prepared_stmt_arena_holder (THD *thd, bool activate_now_if_needed=true)
	Constructs a new object, activates the persistent arena if requested and if a prepared statement or a stored procedure statement is being executed. More...

	~Prepared_stmt_arena_holder ()
	Deactivate the persistent arena (restore the previous arena) if it has been activated. More...

bool	is_activated () const

Private Attributes
THD *const	m_thd
	The thread context to work with. More...

Query_arena *	m_arena
	The arena set by this holder (by activate()). More...

Query_arena	m_backup
	The arena state to be restored. More...

Detailed Description

A simple holder for the Prepared Statement Query_arena instance in THD.

The class utilizes RAII technique to not forget to restore the THD arena.

Constructor & Destructor Documentation

Prepared_stmt_arena_holder::Prepared_stmt_arena_holder	(	THD *	thd,
		bool	activate_now_if_needed = `true`
	)

inlineexplicit

Constructs a new object, activates the persistent arena if requested and if a prepared statement or a stored procedure statement is being executed.

Parameters

thd	Thread context.
activate_now_if_needed	Attempt to activate the persistent arena in the constructor or not.

Prepared_stmt_arena_holder::~Prepared_stmt_arena_holder ( )

inline

Deactivate the persistent arena (restore the previous arena) if it has been activated.

bool Prepared_stmt_arena_holder::is_activated ( ) const

inline

Query_arena* Prepared_stmt_arena_holder::m_arena

private

The arena set by this holder (by activate()).

Query_arena Prepared_stmt_arena_holder::m_backup

private

The arena state to be restored.

THD* const Prepared_stmt_arena_holder::m_thd

private

The thread context to work with.

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