Current_schema_tracker Class Reference

Inheritance diagram for Current_schema_tracker:

Public Member Functions
	Current_schema_tracker ()
	Constructor. More...
bool	enable (THD *thd) override
	Called in the constructor of THD. More...
bool	check (THD *, set_var *) override
	To be invoked when the tracker's system variable is checked (ON_CHECK). More...
bool	update (THD *thd) override
	Enable/disable the tracker based on @session_track_schema's value. More...
bool	store (THD *thd, String &buf) override
	Store the schema name as length-encoded string in the specified buffer. More...
void	mark_as_changed (THD *thd, LEX_CSTRING tracked_item_name) override
	Mark the tracker as changed. More...
Public Member Functions inherited from State_tracker
	State_tracker ()
	Constructor. More...
virtual	~State_tracker ()=default
	Destructor. More...
bool	is_enabled () const
	Getters. More...
bool	is_changed () const
virtual void	claim_memory_ownership (bool claim)

Private Member Functions
void	reset ()
	Reset the m_changed flag for next statement. More...

Private Attributes
bool	schema_track_inited

Additional Inherited Members
Protected Attributes inherited from State_tracker
bool	m_enabled
	Is tracking enabled for a particular session state type ? More...
bool	m_changed
	Has the session state type changed ? More...

Detailed Description

Current_schema_tracker

This is a tracker class that enables & manages the tracking of current schema for a particular connection.

Constructor & Destructor Documentation

Current_schema_tracker()

Current_schema_tracker::Current_schema_tracker ( )

inline

Constructor.

Member Function Documentation

check()

bool Current_schema_tracker::check ( THD *  thd, set_var *  var  )

inlineoverridevirtual

To be invoked when the tracker's system variable is checked (ON_CHECK).

Implements State_tracker.

enable()

bool Current_schema_tracker::enable ( THD *  thd )

inlineoverridevirtual

Called in the constructor of THD.

Implements State_tracker.

mark_as_changed()

void Current_schema_tracker::mark_as_changed ( THD *  thd, LEX_CSTRING  tracked_item_name  )

overridevirtual

Mark the tracker as changed.

Parameters

thd	Current thread
tracked_item_name	Always null (unused).

Implements State_tracker.

reset()

void Current_schema_tracker::reset ( void  )

private

Reset the m_changed flag for next statement.

store()

bool Current_schema_tracker::store ( THD *  thd, String &  buf  )

overridevirtual

Store the schema name as length-encoded string in the specified buffer.

Once the data is stored, we reset the flags related to state-change (see reset()).

Parameters

	thd	The thd handle.
[in,out]	buf	Buffer to store the information to.

Returns

false Success true Error

Implements State_tracker.

update()

bool Current_schema_tracker::update ( THD *  thd )

overridevirtual

Enable/disable the tracker based on @session_track_schema's value.

Parameters

thd	The thd handle.

Returns

false (always)

Implements State_tracker.

Member Data Documentation

schema_track_inited

bool Current_schema_tracker::schema_track_inited

private

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

• sql/session_tracker.cc