page0cur.cc File Reference

#include "page0cur.h"
#include "page0zip.h"
#include "btr0btr.h"
#include "mtr0log.h"
#include "log0recv.h"
#include "ut0ut.h"
#include "rem0cmp.h"

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Functions
UNIV_INTERN void	page_cur_search_with_match (const buf_block_t *block, const dict_index_t *index, const dtuple_t *tuple, ulint mode, ulint *iup_matched_fields, ulint *iup_matched_bytes, ulint *ilow_matched_fields, ulint *ilow_matched_bytes, page_cur_t *cursor)
UNIV_INTERN void	page_cur_open_on_rnd_user_rec (buf_block_t *block, page_cur_t *cursor)
UNIV_INTERN byte *	page_cur_parse_insert_rec (ibool is_short, byte *ptr, byte *end_ptr, buf_block_t *block, dict_index_t *index, mtr_t *mtr)
UNIV_INTERN rec_t *	page_cur_insert_rec_low (rec_t *current_rec, dict_index_t *index, const rec_t *rec, ulint *offsets, mtr_t *mtr)
UNIV_INTERN rec_t *	page_cur_insert_rec_zip (page_cur_t *cursor, dict_index_t *index, const rec_t *rec, ulint *offsets, mtr_t *mtr)
UNIV_INLINE byte *	page_copy_rec_list_to_created_page_write_log (page_t *page, dict_index_t *index, mtr_t *mtr)
UNIV_INTERN byte *	page_parse_copy_rec_list_to_created_page (byte *ptr, byte *end_ptr, buf_block_t *block, dict_index_t *index, mtr_t *mtr)
UNIV_INTERN void	page_copy_rec_list_end_to_created_page (page_t *new_page, rec_t *rec, dict_index_t *index, mtr_t *mtr)
UNIV_INLINE void	page_cur_delete_rec_write_log (rec_t *rec, const dict_index_t *index, mtr_t *mtr)
UNIV_INTERN byte *	page_cur_parse_delete_rec (byte *ptr, byte *end_ptr, buf_block_t *block, dict_index_t *index, mtr_t *mtr)
UNIV_INTERN void	page_cur_delete_rec (page_cur_t *cursor, const dict_index_t *index, const ulint *offsets, mtr_t *mtr)

Detailed Description

The page cursor

Created 10/4/1994 Heikki Tuuri

Definition in file page0cur.cc.

Function Documentation

UNIV_INTERN void page_copy_rec_list_end_to_created_page	(	page_t *	new_page,
		rec_t *	rec,
		dict_index_t *	index,
		mtr_t *	mtr
	)

Copies records from page to a newly created page, from a given record onward, including that record. Infimum and supremum records are not copied.

IMPORTANT: The caller will have to update IBUF_BITMAP_FREE if this is a compressed leaf page in a secondary index. This has to be done either within the same mini-transaction, or by invoking ibuf_reset_free_bits() before mtr_commit().

Parameters

new_page	in/out: index page to copy to
rec	in: first record to copy
index	in: record descriptor
mtr	in: mtr

Definition at line 1715 of file page0cur.cc.

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UNIV_INLINE byte* page_copy_rec_list_to_created_page_write_log	(	page_t *	page,
		dict_index_t *	index,
		mtr_t *	mtr
	)

Writes a log record of copying a record list end to a new created page.

Returns

4-byte field where to write the log data length, or NULL if logging is disabled

Parameters

page	in: index page
index	in: record descriptor
mtr	in: mtr

Definition at line 1626 of file page0cur.cc.

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UNIV_INTERN void page_cur_delete_rec	(	page_cur_t *	cursor,
		const dict_index_t *	index,
		const ulint *	offsets,
		mtr_t *	mtr
	)

Deletes a record at the page cursor. The cursor is moved to the next record after the deleted one.

Parameters

cursor	in/out: a page cursor
index	in: record descriptor
offsets	in: rec_get_offsets( cursor->rec, index)
mtr	in: mini-transaction handle

Definition at line 1974 of file page0cur.cc.

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UNIV_INLINE void page_cur_delete_rec_write_log	(	rec_t *	rec,
		const dict_index_t *	index,
		mtr_t *	mtr
	)

Writes log record of a record delete on a page.

Parameters

rec	in: record to be deleted
index	in: record descriptor
mtr	in: mini-transaction handle

Definition at line 1890 of file page0cur.cc.

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UNIV_INTERN rec_t* page_cur_insert_rec_low	(	rec_t *	current_rec,
		dict_index_t *	index,
		const rec_t *	rec,
		ulint *	offsets,
		mtr_t *	mtr
	)

Inserts a record next to page cursor on an uncompressed page. Returns pointer to inserted record if succeed, i.e., enough space available, NULL otherwise. The cursor stays at the same position.

Returns

pointer to record if succeed, NULL otherwise

< the relevant page

< cursor position at previous insert

< a free record that was reused, or NULL

< inserted record

< heap number of the inserted record

Parameters

current_rec	in: pointer to current record after which the new record is inserted
index	in: record descriptor
rec	in: pointer to a physical record
offsets	in/out: rec_get_offsets(rec, index)
mtr	in: mini-transaction handle, or NULL

Definition at line 953 of file page0cur.cc.

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UNIV_INTERN rec_t* page_cur_insert_rec_zip	(	page_cur_t *	cursor,
		dict_index_t *	index,
		const rec_t *	rec,
		ulint *	offsets,
		mtr_t *	mtr
	)

Inserts a record next to page cursor on a compressed and uncompressed page. Returns pointer to inserted record if succeed, i.e., enough space available, NULL otherwise. The cursor stays at the same position.

IMPORTANT: The caller will have to update IBUF_BITMAP_FREE if this is a compressed leaf page in a secondary index. This has to be done either within the same mini-transaction, or by invoking ibuf_reset_free_bits() before mtr_commit().

Returns

pointer to record if succeed, NULL otherwise

< the relevant page

< cursor position at previous insert

< a free record that was reused, or NULL

< inserted record

< heap number of the inserted record

Parameters

cursor	in/out: page cursor
index	in: record descriptor
rec	in: pointer to a physical record
offsets	in/out: rec_get_offsets(rec, index)
mtr	in: mini-transaction handle, or NULL

Definition at line 1177 of file page0cur.cc.

UNIV_INTERN void page_cur_open_on_rnd_user_rec	(	buf_block_t *	block,
		page_cur_t *	cursor
	)

Positions a page cursor on a randomly chosen user record on a page. If there are no user records, sets the cursor on the infimum record.

Parameters

block	in: page
cursor	out: page cursor

Definition at line 547 of file page0cur.cc.

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UNIV_INTERN byte* page_cur_parse_delete_rec	(	byte *	ptr,
		byte *	end_ptr,
		buf_block_t *	block,
		dict_index_t *	index,
		mtr_t *	mtr
	)

Parses log record of a record delete on a page.

Returns

pointer to record end or NULL

Parameters

ptr	in: buffer
end_ptr	in: buffer end
block	in: page or NULL
index	in: record descriptor
mtr	in: mtr or NULL

Definition at line 1925 of file page0cur.cc.

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UNIV_INTERN byte* page_cur_parse_insert_rec	(	ibool	is_short,
		byte *	ptr,
		byte *	end_ptr,
		buf_block_t *	block,
		dict_index_t *	index,
		mtr_t *	mtr
	)

Parses a log record of a record insert on a page.

Returns

end of log record or NULL

Parameters

is_short	in: TRUE if short inserts
ptr	in: buffer
end_ptr	in: buffer end
block	in: page or NULL
index	in: record descriptor
mtr	in: mtr or NULL

Definition at line 759 of file page0cur.cc.

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UNIV_INTERN void page_cur_search_with_match	(	const buf_block_t *	block,
		const dict_index_t *	index,
		const dtuple_t *	tuple,
		ulint	mode,
		ulint *	iup_matched_fields,
		ulint *	iup_matched_bytes,
		ulint *	ilow_matched_fields,
		ulint *	ilow_matched_bytes,
		page_cur_t *	cursor
	)

Searches the right position for a page cursor.

Parameters

block	in: buffer block
index	in: record descriptor
tuple	in: data tuple
mode	in: PAGE_CUR_L, PAGE_CUR_LE, PAGE_CUR_G, or PAGE_CUR_GE
iup_matched_fields	in/out: already matched fields in upper limit record
iup_matched_bytes	in/out: already matched bytes in a field not yet completely matched
ilow_matched_fields	in/out: already matched fields in lower limit record
ilow_matched_bytes	in/out: already matched bytes in a field not yet completely matched
cursor	out: page cursor

Definition at line 248 of file page0cur.cc.

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UNIV_INTERN byte* page_parse_copy_rec_list_to_created_page	(	byte *	ptr,
		byte *	end_ptr,
		buf_block_t *	block,
		dict_index_t *	index,
		mtr_t *	mtr
	)

Parses a log record of copying a record list end to a new created page.

Returns

end of log record or NULL

Parameters

ptr	in: buffer
end_ptr	in: buffer end
block	in: page or NULL
index	in: record descriptor
mtr	in: mtr or NULL

Definition at line 1653 of file page0cur.cc.

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