row0undo.cc File Reference

Row undo. More...

#include <stddef.h>
#include "fsp0fsp.h"
#include "ha_prototypes.h"
#include "mach0data.h"
#include "que0que.h"
#include "row0mysql.h"
#include "row0row.h"
#include "row0uins.h"
#include "row0umod.h"
#include "row0undo.h"
#include "row0upd.h"
#include "srv0srv.h"
#include "trx0purge.h"
#include "trx0rec.h"
#include "trx0roll.h"
#include "trx0rseg.h"
#include "trx0trx.h"
#include "trx0undo.h"

Functions
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...
static dberr_t	row_undo (undo_node_t *node, que_thr_t *thr)
	Fetches an undo log record and does the undo for the recorded operation. More...
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...
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

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()

static dberr_t row_undo ( undo_node_t *  node, que_thr_t *  thr  )

static

Fetches an undo log record and does the undo for the recorded operation.

If none left, or a partial rollback completed, returns control to the parent node, which is always a query thread node.

Returns

DB_SUCCESS if operation successfully completed, else error code

Parameters

node	in: row undo node
thr	in: query thread

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

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

Parameters

thr	in: query thread