table_variables_metadata Class Reference

Table PERFORMANCE_SCHEMA.VARIABLES_METADATA. More...

#include <table_variables_metadata.h>

Inheritance diagram for table_variables_metadata:

Public Member Functions
int	rnd_init (bool scan) override
	Initialize table scan. More...
int	rnd_next () override
	Fetch the next row in this cursor. More...
int	rnd_pos (const void *pos) override
	Fetch a row by position. More...
void	reset_position () override
	Reset the cursor position to the beginning of the table. More...
	~table_variables_metadata () override=default
Public Member Functions inherited from PFS_engine_table
int	read_row (TABLE *table, unsigned char *buf, Field **fields)
	Read a table row. More...
int	update_row (TABLE *table, const unsigned char *old_buf, unsigned char *new_buf, Field **fields)
	Update a table row. More...
int	delete_row (TABLE *table, const unsigned char *buf, Field **fields)
	Delete a row from this table. More...
virtual int	index_init (uint idx, bool sorted)
virtual int	index_read (KEY *key_infos, uint index, const uchar *key, uint key_len, enum ha_rkey_function find_flag)
	Positions an index cursor to the index specified in the handle. More...
virtual int	index_read_last (KEY *key_infos, const uchar *key, uint key_len)
virtual int	index_next ()
	Find key in index, read record. More...
virtual int	index_next_same (const uchar *key, uint key_len)
	Reads the next row matching the given key value. More...
virtual int	index_prev ()
virtual int	index_first ()
virtual int	index_last ()
void	get_position (void *ref)
	Get the position of the current row. More...
void	set_position (const void *ref)
	Set the table cursor at a given position. More...
virtual	~PFS_engine_table ()=default
	Destructor. More...

Static Public Member Functions
static PFS_engine_table *	create (PFS_engine_table_share *)
static ha_rows	get_row_count ()
Static Public Member Functions inherited from PFS_engine_table
static PFS_engine_table_share *	find_engine_table_share (const char *name)
	Find a table share by name. More...

Static Public Attributes
static PFS_engine_table_share	m_share
	Table share. More...

Protected Member Functions
int	read_row_values (TABLE *table, unsigned char *buf, Field **fields, bool read_all) override
	Read the current row values. More...
	table_variables_metadata ()
bool	init_sys_var_array ()
	Build a sorted list of all system variables from the system variable hash. More...
int	do_materialize_all ()
	Build a GLOBAL system variable cache. More...
int	make_row (const row_variables_metadata &row)
Protected Member Functions inherited from PFS_engine_table
virtual int	update_row_values (TABLE *table, const unsigned char *old_buf, unsigned char *new_buf, Field **fields)
	Update the current row values. More...
virtual int	delete_row_values (TABLE *table, const unsigned char *buf, Field **fields)
	Delete a row. More...
	PFS_engine_table (const PFS_engine_table_share *share, void *pos)
	Constructor. More...

Private Types
typedef PFS_simple_index	pos_t
typedef Prealloced_array< row_variables_metadata, SYSTEM_VARIABLE_PREALLOC >	Variable_array

Private Attributes
bool	m_initialized
System_variable_tracker::Array	m_sys_var_tracker_array
Variable_array	m_cache
bool	m_materialized
ulonglong	m_version
row_variables_metadata	m_row
	Current row. More...
pos_t	m_pos
	Current position. More...
pos_t	m_next_pos
	Next position. More...

Static Private Attributes
static THR_LOCK	m_table_lock
	Table share lock. More...
static Plugin_table	m_table_def
	Table definition. More...

Additional Inherited Members
Protected Attributes inherited from PFS_engine_table
const PFS_engine_table_share *	m_share_ptr
	Table share. More...
void *	m_pos_ptr
	Opaque pointer to the m_pos position of this cursor. More...
time_normalizer *	m_normalizer
	Current normalizer. More...
PFS_engine_index_abstract *	m_index
	Current index. More...

Detailed Description

Table PERFORMANCE_SCHEMA.VARIABLES_METADATA.

Member Typedef Documentation

pos_t

typedef PFS_simple_index table_variables_metadata::pos_t

private

Variable_array

typedef Prealloced_array<row_variables_metadata, SYSTEM_VARIABLE_PREALLOC> table_variables_metadata::Variable_array

private

Constructor & Destructor Documentation

table_variables_metadata()

table_variables_metadata::table_variables_metadata ( )

protected

~table_variables_metadata()

table_variables_metadata::~table_variables_metadata ( )

overridedefault

Member Function Documentation

create()

PFS_engine_table * table_variables_metadata::create ( PFS_engine_table_share *  )

static

do_materialize_all()

int table_variables_metadata::do_materialize_all ( )

protected

Build a GLOBAL system variable cache.

get_row_count()

ha_rows table_variables_metadata::get_row_count ( )

static

init_sys_var_array()

bool table_variables_metadata::init_sys_var_array ( )

protected

Build a sorted list of all system variables from the system variable hash.

Filter by scope. Must be called inside of LOCK_plugin_delete.

make_row()

int table_variables_metadata::make_row ( const row_variables_metadata &  row )

protected

read_row_values()

int table_variables_metadata::read_row_values ( TABLE *  table, unsigned char *  buf, Field **  fields, bool  read_all  )

overrideprotectedvirtual

Read the current row values.

Parameters

table	Table handle
buf	row buffer
fields	Table fields
read_all	true if all columns are read.

Implements PFS_engine_table.

reset_position()

void table_variables_metadata::reset_position ( )

overridevirtual

Reset the cursor position to the beginning of the table.

Implements PFS_engine_table.

rnd_init()

int table_variables_metadata::rnd_init ( bool  scan )

overridevirtual

Initialize table scan.

Reimplemented from PFS_engine_table.

rnd_next()

int table_variables_metadata::rnd_next ( )

overridevirtual

Fetch the next row in this cursor.

Implements PFS_engine_table.

rnd_pos()

int table_variables_metadata::rnd_pos ( const void *  pos )

overridevirtual

Fetch a row by position.

Parameters

pos	position to fetch

Implements PFS_engine_table.

Member Data Documentation

m_cache

Variable_array table_variables_metadata::m_cache

private

m_initialized

bool table_variables_metadata::m_initialized

private

m_materialized

bool table_variables_metadata::m_materialized

private

m_next_pos

pos_t table_variables_metadata::m_next_pos

private

Next position.

m_pos

pos_t table_variables_metadata::m_pos

private

Current position.

m_row

row_variables_metadata table_variables_metadata::m_row

private

Current row.

m_share

PFS_engine_table_share table_variables_metadata::m_share

static

Initial value:

= {
    &pfs_readonly_world_acl,
    table_variables_metadata::create,
    nullptr, 
    nullptr, 
    table_variables_metadata::get_row_count,
    sizeof(pos_t),
    &m_table_lock,
    &m_table_def,
    true, 
    PFS_engine_table_proxy(),
    {0},
    false 
}

Table share.

m_sys_var_tracker_array

System_variable_tracker::Array table_variables_metadata::m_sys_var_tracker_array

private

m_table_def

Plugin_table table_variables_metadata::m_table_def

staticprivate

Table definition.

m_table_lock

THR_LOCK table_variables_metadata::m_table_lock

staticprivate

Table share lock.

m_version

ulonglong table_variables_metadata::m_version

private

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

• storage/perfschema/table_variables_metadata.h
• storage/perfschema/table_variables_metadata.cc