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+/*****************************************************************************
+
+Copyright (c) 1996, 2009, Innobase Oy. 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(rec, 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 */