row0undo.h File Reference

Row undo. More...

#include "btr0pcur.h"
#include "btr0types.h"
#include "dict0types.h"
#include "mtr0mtr.h"
#include "que0types.h"
#include "row0types.h"
#include "trx0sys.h"
#include "trx0types.h"
#include "univ.i"

Go to the source code of this file.

Classes
struct	undo_node_t
	Undo node structure. More...

Enumerations
enum	undo_exec { UNDO_NODE_FETCH_NEXT = 1 , UNDO_NODE_INSERT , UNDO_NODE_MODIFY }
	Execution state of an undo node. More...

Functions
void	row_convert_impl_to_expl_if_needed (btr_cur_t *cursor, undo_node_t *node)
	Converts an implicit lock on the record to explicit in case of partial rollback. More...
undo_node_t *	row_undo_node_create (trx_t *trx, que_thr_t *parent, mem_heap_t *heap, bool partial_rollback)
	Creates a row undo node to a query graph. More...
bool	row_undo_search_clust_to_pcur (undo_node_t *node)
	Looks for the clustered index record when node has the row reference. More...
que_thr_t *	row_undo_step (que_thr_t *thr)
	Undoes a row operation in a table. More...

Detailed Description

Row undo.

Created 1/8/1997 Heikki Tuuri

Enumeration Type Documentation

undo_exec

enum undo_exec

Execution state of an undo node.

Enumerator
UNDO_NODE_FETCH_NEXT	we should fetch the next undo log record
UNDO_NODE_INSERT	undo a fresh insert of a row to a table
UNDO_NODE_MODIFY	undo a modify operation (DELETE or UPDATE) on a row of a table

Function Documentation

row_convert_impl_to_expl_if_needed()

void row_convert_impl_to_expl_if_needed	(	btr_cur_t *	cursor,
		undo_node_t *	node
	)

Converts an implicit lock on the record to explicit in case of partial rollback.

Parameters

[in]	cursor	cursor to record
[in]	node	undo node

row_undo_node_create()

undo_node_t * row_undo_node_create	(	trx_t *	trx,
		que_thr_t *	parent,
		mem_heap_t *	heap,
		bool	partial_rollback
	)

Creates a row undo node to a query graph.

Parameters

[in]	trx	transaction
[in]	parent	parent node, i.e., a thr node
[in]	heap	memory heap where created
[in]	partial_rollback	true if partial rollback

Returns

undo node

row_undo_search_clust_to_pcur()

bool row_undo_search_clust_to_pcur

(

undo_node_t *

node

)

Looks for the clustered index record when node has the row reference.

The pcur in node is used in the search. If found, stores the row to node, and stores the position of pcur, and detaches it. The pcur must be closed by the caller in any case.

Returns

true if found; NOTE the node->pcur must be closed by the caller, regardless of the return value in/out: row undo node

The pcur in node is used in the search. If found, stores the row to node, and stores the position of pcur, and detaches it. The pcur must be closed by the caller in any case.

Returns

true if found; NOTE the node->pcur must be closed by the caller, regardless of the return value

Parameters

node	in/out: row undo node

row_undo_step()

que_thr_t * row_undo_step

(

que_thr_t *

thr

)

Undoes a row operation in a table.

This is a high-level function used in SQL execution graphs.

Returns

query thread to run next or NULL in: query thread

This is a high-level function used in SQL execution graphs.

Returns

query thread to run next or NULL

Parameters

thr	in: query thread