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/*****************************************************************************
Copyright (c) 1996, 2011, Oracle and/or its affiliates. All Rights Reserved.
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place, Suite 330, Boston, MA 02111-1307 USA
*****************************************************************************/
/**************************************************//**
@file include/row0upd.ic
Update of a row
Created 12/27/1996 Heikki Tuuri
*******************************************************/
#include "mtr0log.h"
#ifndef UNIV_HOTBACKUP
# include "trx0trx.h"
# include "trx0undo.h"
# include "row0row.h"
# include "btr0sea.h"
#endif /* !UNIV_HOTBACKUP */
#include "page0zip.h"
/*********************************************************************//**
Creates an update vector object.
@return own: update vector object */
UNIV_INLINE
upd_t*
upd_create(
/*=======*/
ulint n, /*!< in: number of fields */
mem_heap_t* heap) /*!< in: heap from which memory allocated */
{
upd_t* update;
update = (upd_t*) mem_heap_alloc(heap, sizeof(upd_t));
update->info_bits = 0;
update->n_fields = n;
update->fields = (upd_field_t*)
mem_heap_alloc(heap, sizeof(upd_field_t) * n);
return(update);
}
/*********************************************************************//**
Returns the number of fields in the update vector == number of columns
to be updated by an update vector.
@return number of fields */
UNIV_INLINE
ulint
upd_get_n_fields(
/*=============*/
const upd_t* update) /*!< in: update vector */
{
ut_ad(update);
return(update->n_fields);
}
#ifdef UNIV_DEBUG
/*********************************************************************//**
Returns the nth field of an update vector.
@return update vector field */
UNIV_INLINE
upd_field_t*
upd_get_nth_field(
/*==============*/
const upd_t* update, /*!< in: update vector */
ulint n) /*!< in: field position in update vector */
{
ut_ad(update);
ut_ad(n < update->n_fields);
return((upd_field_t*) update->fields + n);
}
#endif /* UNIV_DEBUG */
#ifndef UNIV_HOTBACKUP
/*********************************************************************//**
Sets an index field number to be updated by an update vector field. */
UNIV_INLINE
void
upd_field_set_field_no(
/*===================*/
upd_field_t* upd_field, /*!< in: update vector field */
ulint field_no, /*!< in: field number in a clustered
index */
dict_index_t* index, /*!< in: index */
trx_t* trx) /*!< in: transaction */
{
upd_field->field_no = field_no;
upd_field->orig_len = 0;
if (UNIV_UNLIKELY(field_no >= dict_index_get_n_fields(index))) {
fprintf(stderr,
"InnoDB: Error: trying to access field %lu in ",
(ulong) field_no);
dict_index_name_print(stderr, trx, index);
fprintf(stderr, "\n"
"InnoDB: but index only has %lu fields\n",
(ulong) dict_index_get_n_fields(index));
}
dict_col_copy_type(dict_index_get_nth_col(index, field_no),
dfield_get_type(&upd_field->new_val));
}
/*********************************************************************//**
Returns a field of an update vector by field_no.
@return update vector field, or NULL */
UNIV_INLINE
const upd_field_t*
upd_get_field_by_field_no(
/*======================*/
const upd_t* update, /*!< in: update vector */
ulint no) /*!< in: field_no */
{
ulint i;
for (i = 0; i < upd_get_n_fields(update); i++) {
const upd_field_t* uf = upd_get_nth_field(update, i);
if (uf->field_no == no) {
return(uf);
}
}
return(NULL);
}
/*********************************************************************//**
Updates the trx id and roll ptr field in a clustered index record when
a row is updated or marked deleted. */
UNIV_INLINE
void
row_upd_rec_sys_fields(
/*===================*/
rec_t* rec, /*!< in/out: record */
page_zip_des_t* page_zip,/*!< in/out: compressed page whose
uncompressed part will be updated, or NULL */
dict_index_t* index, /*!< in: clustered index */
const ulint* offsets,/*!< in: rec_get_offsets(rec, index) */
trx_t* trx, /*!< in: transaction */
roll_ptr_t roll_ptr)/*!< in: roll ptr of the undo log record */
{
ut_ad(dict_index_is_clust(index));
ut_ad(rec_offs_validate(rec, index, offsets));
#ifdef UNIV_SYNC_DEBUG
if (!rw_lock_own(&btr_search_latch, RW_LOCK_EX)) {
ut_ad(!buf_block_align(rec)->is_hashed);
}
#endif /* UNIV_SYNC_DEBUG */
if (UNIV_LIKELY_NULL(page_zip)) {
ulint pos = dict_index_get_sys_col_pos(index, DATA_TRX_ID);
page_zip_write_trx_id_and_roll_ptr(page_zip, rec, offsets,
pos, trx->id, roll_ptr);
} else {
ulint offset = index->trx_id_offset;
if (!offset) {
offset = row_get_trx_id_offset(index, offsets);
}
#if DATA_TRX_ID + 1 != DATA_ROLL_PTR
# error "DATA_TRX_ID + 1 != DATA_ROLL_PTR"
#endif
trx_write_trx_id(rec + offset, trx->id);
trx_write_roll_ptr(rec + offset + DATA_TRX_ID_LEN, roll_ptr);
}
}
#endif /* !UNIV_HOTBACKUP */
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