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153 lines
4.3 KiB
C++
153 lines
4.3 KiB
C++
/*****************************************************************************
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Copyright (c) 1996, 2015, Oracle and/or its affiliates. All Rights Reserved.
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Copyright (c) 2017, 2020, MariaDB Corporation.
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA
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*****************************************************************************/
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/**************************************************//**
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@file include/row0upd.ic
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Update of a row
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Created 12/27/1996 Heikki Tuuri
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*******************************************************/
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#include "mtr0log.h"
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#include "trx0trx.h"
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#include "trx0undo.h"
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#include "row0row.h"
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#include "lock0lock.h"
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#include "page0zip.h"
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/*********************************************************************//**
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Creates an update vector object.
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@return own: update vector object */
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UNIV_INLINE
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upd_t*
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upd_create(
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/*=======*/
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ulint n, /*!< in: number of fields */
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mem_heap_t* heap) /*!< in: heap from which memory allocated */
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{
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upd_t* update;
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update = static_cast<upd_t*>(mem_heap_zalloc(
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heap, sizeof(upd_t) + sizeof(upd_field_t) * n));
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update->n_fields = n;
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update->fields = reinterpret_cast<upd_field_t*>(&update[1]);
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update->heap = heap;
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return(update);
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}
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/*********************************************************************//**
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Returns the number of fields in the update vector == number of columns
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to be updated by an update vector.
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@return number of fields */
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UNIV_INLINE
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ulint
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upd_get_n_fields(
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/*=============*/
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const upd_t* update) /*!< in: update vector */
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{
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ut_ad(update);
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return(update->n_fields);
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}
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#ifdef UNIV_DEBUG
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/*********************************************************************//**
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Returns the nth field of an update vector.
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@return update vector field */
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UNIV_INLINE
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upd_field_t*
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upd_get_nth_field(
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/*==============*/
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const upd_t* update, /*!< in: update vector */
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ulint n) /*!< in: field position in update vector */
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{
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ut_ad(update);
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ut_ad(n < update->n_fields);
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return((upd_field_t*) update->fields + n);
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}
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#endif /* UNIV_DEBUG */
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/*********************************************************************//**
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Sets an index field number to be updated by an update vector field. */
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UNIV_INLINE
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void
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upd_field_set_field_no(
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/*===================*/
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upd_field_t* upd_field, /*!< in: update vector field */
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uint16_t field_no, /*!< in: field number in a clustered
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index */
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dict_index_t* index) /*!< in: index */
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{
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upd_field->field_no = field_no;
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upd_field->orig_len = 0;
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dict_col_copy_type(dict_index_get_nth_col(index, field_no),
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dfield_get_type(&upd_field->new_val));
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}
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/** set field number to a update vector field, marks this field is updated.
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@param[in,out] upd_field update vector field
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@param[in] field_no virtual column sequence num
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@param[in] index index */
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UNIV_INLINE
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void
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upd_field_set_v_field_no(
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upd_field_t* upd_field,
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uint16_t field_no,
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dict_index_t* index)
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{
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ut_a(field_no < dict_table_get_n_v_cols(index->table));
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upd_field->field_no = field_no;
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upd_field->orig_len = 0;
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dict_col_copy_type(&dict_table_get_nth_v_col(
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index->table, field_no)->m_col,
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dfield_get_type(&upd_field->new_val));
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}
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/*********************************************************************//**
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Returns a field of an update vector by field_no.
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@return update vector field, or NULL */
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UNIV_INLINE
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const upd_field_t*
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upd_get_field_by_field_no(
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/*======================*/
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const upd_t* update, /*!< in: update vector */
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uint16_t no, /*!< in: field_no */
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bool is_virtual) /*!< in: if it is virtual column */
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{
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ulint i;
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for (i = 0; i < upd_get_n_fields(update); i++) {
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const upd_field_t* uf = upd_get_nth_field(update, i);
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/* matches only if the field matches that of is_virtual */
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if ((!is_virtual) != (!upd_fld_is_virtual_col(uf))) {
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continue;
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}
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if (uf->field_no == no) {
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return(uf);
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}
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}
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return(NULL);
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}
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