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/*****************************************************************************
Copyright (c) 1996, 2015, Oracle and/or its affiliates. All Rights Reserved.
Copyright (c) 2017, 2020, MariaDB Corporation.
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.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA
*****************************************************************************/
/**************************************************//**
@file include/row0upd.ic
Update of a row
Created 12/27/1996 Heikki Tuuri
*******************************************************/
#include "mtr0log.h"
#include "trx0trx.h"
#include "trx0undo.h"
#include "row0row.h"
#include "lock0lock.h"
#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 = static_cast<upd_t*>(mem_heap_zalloc(
heap, sizeof(upd_t) + sizeof(upd_field_t) * n));
update->n_fields = n;
update->fields = reinterpret_cast<upd_field_t*>(&update[1]);
update->heap = heap;
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 */
/*********************************************************************//**
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 */
uint16_t field_no, /*!< in: field number in a clustered
index */
dict_index_t* index) /*!< in: index */
{
upd_field->field_no = field_no;
upd_field->orig_len = 0;
dict_col_copy_type(dict_index_get_nth_col(index, field_no),
dfield_get_type(&upd_field->new_val));
}
/** set field number to a update vector field, marks this field is updated.
@param[in,out] upd_field update vector field
@param[in] field_no virtual column sequence num
@param[in] index index */
UNIV_INLINE
void
upd_field_set_v_field_no(
upd_field_t* upd_field,
uint16_t field_no,
dict_index_t* index)
{
ut_a(field_no < dict_table_get_n_v_cols(index->table));
upd_field->field_no = field_no;
upd_field->orig_len = 0;
dict_col_copy_type(&dict_table_get_nth_v_col(
index->table, field_no)->m_col,
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 */
uint16_t no, /*!< in: field_no */
bool is_virtual) /*!< in: if it is virtual column */
{
ulint i;
for (i = 0; i < upd_get_n_fields(update); i++) {
const upd_field_t* uf = upd_get_nth_field(update, i);
/* matches only if the field matches that of is_virtual */
if ((!is_virtual) != (!upd_fld_is_virtual_col(uf))) {
continue;
}
if (uf->field_no == no) {
return(uf);
}
}
return(NULL);
}
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