btr0pcur.h File Reference

The index tree persistent cursor. More...

#include "btr0btr.h"
#include "btr0cur.h"
#include "btr0types.h"
#include "buf0block_hint.h"
#include "data0data.h"
#include "dict0dict.h"
#include "mtr0mtr.h"
#include "page0cur.h"
#include "univ.i"
#include "gis0rtree.h"

Go to the source code of this file.

Classes
struct	import_ctx_t
struct	btr_pcur_t

Enumerations
enum	btr_pcur_pos_t {   BTR_PCUR_UNSET = 0 , BTR_PCUR_ON = 1 , BTR_PCUR_BEFORE = 2 , BTR_PCUR_AFTER = 3 ,   BTR_PCUR_BEFORE_FIRST_IN_TREE = 4 , BTR_PCUR_AFTER_LAST_IN_TREE = 5 }
	Relative positions for a stored cursor position. More...
enum	pcur_pos_t { BTR_PCUR_NOT_POSITIONED = 0 , BTR_PCUR_WAS_POSITIONED , BTR_PCUR_IS_POSITIONED_OPTIMISTIC , BTR_PCUR_IS_POSITIONED }
	Position state of persistent B-tree cursor. More...

Detailed Description

The index tree persistent cursor.

Created 2/23/1996 Heikki Tuuri

Enumeration Type Documentation

btr_pcur_pos_t

enum btr_pcur_pos_t

Relative positions for a stored cursor position.

Enumerator
BTR_PCUR_UNSET
BTR_PCUR_ON
BTR_PCUR_BEFORE
BTR_PCUR_AFTER
BTR_PCUR_BEFORE_FIRST_IN_TREE
BTR_PCUR_AFTER_LAST_IN_TREE

pcur_pos_t

enum pcur_pos_t

Position state of persistent B-tree cursor.

Enumerator
BTR_PCUR_NOT_POSITIONED	The persistent cursor is not positioned.
BTR_PCUR_WAS_POSITIONED	The persistent cursor was previously positioned. TODO: currently, the state can be BTR_PCUR_IS_POSITIONED, though it really should be BTR_PCUR_WAS_POSITIONED, because we have no obligation to commit the cursor with mtr; similarly latch_mode may be out of date. This can lead to problems if btr_pcur is not used the right way; all current code should be ok.
BTR_PCUR_IS_POSITIONED_OPTIMISTIC	The persistent cursor is positioned by optimistic get to the same record as it was positioned at. Not used for rel_pos == BTR_PCUR_ON. It may need adjustment depending on previous/current search direction and rel_pos.
BTR_PCUR_IS_POSITIONED	The persistent cursor is positioned by index search. Or optimistic get for rel_pos == BTR_PCUR_ON.