Undo information about LOB data alone without including LOB index. More...

#include <lob0undo.h>

Public Member Functions
void	apply (dict_index_t index, byte lob_mem, size_t len, size_t lob_version, page_no_t first_page_no)
	Apply the undo information to the given LOB. More...

const byte *	copy_old_data (const byte *undo_ptr, ulint len)
	Copy the old data from the undo page into this object. More...

void	destroy ()
	Free allocated memory for old data. More...

std::ostream &	print (std::ostream &out) const

Public Attributes
page_no_t	m_page_no = FIL_NULL
	The LOB first page number. More...

ulint	m_version = 0
	The LOB version number on which this undo should be applied. More...

ulint	m_offset = 0
	The offset within LOB where partial update happened. More...

ulint	m_length = 0
	The length of the modification. More...

byte *	m_old_data = nullptr
	Changes to the LOB data. More...

Detailed Description

Undo information about LOB data alone without including LOB index.

Member Function Documentation

◆ apply()

void lob::undo_data_t::apply	(	dict_index_t *	index,
		byte *	lob_mem,
		size_t	len,
		size_t	lob_version,
		page_no_t	first_page_no
	)

Apply the undo information to the given LOB.

Parameters

[in]	index	clustered index containing the LOB.
[in]	lob_mem	LOB on which the given undo will be applied.
[in]	len	length of LOB.
[in]	lob_version	lob version number
[in]	first_page_no	the first page number of lob

◆ copy_old_data()

const byte * lob::undo_data_t::copy_old_data	(	const byte *	undo_ptr,
		ulint	len
	)

Copy the old data from the undo page into this object.

Parameters

[in]	undo_ptr	the pointer into the undo log record.
[in]	len	length of the old data.

Returns: pointer past the old data.

◆ destroy()

void lob::undo_data_t::destroy ( )

Free allocated memory for old data.

◆ print()

std::ostream & lob::undo_data_t::print ( std::ostream & out ) const

Member Data Documentation

◆ m_length

ulint lob::undo_data_t::m_length = 0

The length of the modification.

◆ m_offset

ulint lob::undo_data_t::m_offset = 0

The offset within LOB where partial update happened.

◆ m_old_data

byte* lob::undo_data_t::m_old_data = nullptr

Changes to the LOB data.

◆ m_page_no

page_no_t lob::undo_data_t::m_page_no = FIL_NULL

The LOB first page number.

◆ m_version

ulint lob::undo_data_t::m_version = 0

The LOB version number on which this undo should be applied.

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

storage/innobase/include/lob0undo.h
storage/innobase/lob/lob0undo.cc

Public Member Functions

Public Attributes