cursor_by_error_log Class Reference

Cursor CURSOR_BY_ERROR_LOG for error_log table. More...

#include <cursor_by_error_log.h>

Inheritance diagram for cursor_by_error_log:

Public Member Functions
void	reset_position () override
	Reset cursor position. More...
int	rnd_next () override
	Read next row (from ring-buffer into table). More...
int	rnd_pos (const void *pos) override
	Random pos. More...
int	index_next () override
	Go to next entry in index and retrieve the matching error log event. More...
	~cursor_by_error_log () 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	rnd_init (bool scan)
	Initialize table scan. 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_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 ha_rows	get_row_count ()
	Get row-count (by getting the number of events in the ring-buffer) More...
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...

Protected Member Functions
	cursor_by_error_log (const PFS_engine_table_share *share)
virtual int	make_row (log_sink_pfs_event *row)=0
Protected Member Functions inherited from PFS_engine_table
virtual int	read_row_values (TABLE *table, unsigned char *buf, Field **fields, bool read_all)=0
	Read the current row values. More...
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...

Protected Attributes
PFS_index_error_log *	m_opened_index
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...

Private Attributes
pos_t	m_pos
	Current position. More...
pos_t	m_next_pos
	Next position. More...

Detailed Description

Cursor CURSOR_BY_ERROR_LOG for error_log table.

Constructor & Destructor Documentation

cursor_by_error_log()

cursor_by_error_log::cursor_by_error_log ( const PFS_engine_table_share *  share )

explicitprotected

~cursor_by_error_log()

cursor_by_error_log::~cursor_by_error_log ( )

overridedefault

Member Function Documentation

get_row_count()

ha_rows cursor_by_error_log::get_row_count ( )

static

Get row-count (by getting the number of events in the ring-buffer)

index_next()

int cursor_by_error_log::index_next ( )

overridevirtual

Go to next entry in index and retrieve the matching error log event.

We come through here e.g. for = in the SELECT's condition, i.e. HA_READ_KEY_EXACT.

Return values

HA_ERR_END_OF_FILE	failed to locate data, or to create a row from it
0	success

Reimplemented from PFS_engine_table.

make_row()

virtual int cursor_by_error_log::make_row ( log_sink_pfs_event *  row )

protectedpure virtual

Implemented in table_error_log.

reset_position()

void cursor_by_error_log::reset_position ( )

overridevirtual

Reset cursor position.

We come through here when using a condition (rather than just ORDER BY [ASC/DESC]) in SELECT, e.g. in the form of ha_perfschema::index_read with HA_READ_KEY_EXACT when using =.

We don't need a lock here since the reset breaks the association with the ring-buffer; it will be re-established on the first read- style primitive (reading a "row" of payload from the ring-buffer, or trying to advance to the next entry, either of which will imply log_sink_pfs_event_first() at some point).

Implements PFS_engine_table.

rnd_next()

int cursor_by_error_log::rnd_next ( )

overridevirtual

Read next row (from ring-buffer into table).

We come through here when not using an index.

Return values

HA_ERR_END_OF_FILE	failed to locate data, or to create a row from it
0	success

Implements PFS_engine_table.

rnd_pos()

int cursor_by_error_log::rnd_pos ( const void *  pos )

overridevirtual

Random pos.

Unused.

Return values

HA_ERR_RECORD_DELETED	failed to locate data/to create a row from it
0	success

Implements PFS_engine_table.

Member Data Documentation

m_next_pos

pos_t cursor_by_error_log::m_next_pos

private

Next position.

m_opened_index

PFS_index_error_log* cursor_by_error_log::m_opened_index

protected

m_pos

pos_t cursor_by_error_log::m_pos

private

Current position.

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

• storage/perfschema/cursor_by_error_log.h
• storage/perfschema/cursor_by_error_log.cc