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141 lines
3.9 KiB
Text
141 lines
3.9 KiB
Text
/******************************************************
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Update of a row
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(c) 1996 Innobase Oy
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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 "btr0sea.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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UNIV_INLINE
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upd_t*
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upd_create(
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/*=======*/
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/* out, own: update vector object */
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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 = (upd_t*) mem_heap_alloc(heap, sizeof(upd_t));
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update->info_bits = 0;
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update->n_fields = n;
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update->fields = (upd_field_t*)
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mem_heap_alloc(heap, sizeof(upd_field_t) * n);
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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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UNIV_INLINE
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ulint
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upd_get_n_fields(
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/*=============*/
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/* out: number of fields */
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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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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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/* out: update vector field */
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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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ulint 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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trx_t* trx) /* in: transaction */
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{
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upd_field->field_no = field_no;
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if (UNIV_UNLIKELY(field_no >= dict_index_get_n_fields(index))) {
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fprintf(stderr,
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"InnoDB: Error: trying to access field %lu in ",
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(ulong) field_no);
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dict_index_name_print(stderr, trx, index);
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fprintf(stderr, "\n"
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"InnoDB: but index only has %lu fields\n",
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(ulong) dict_index_get_n_fields(index));
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}
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dict_col_copy_type(dict_index_get_nth_col(index, field_no),
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(dtype_t*) dfield_get_type(&(upd_field->new_val)));
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}
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/*************************************************************************
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Updates the trx id and roll ptr field in a clustered index record when
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a row is updated or marked deleted. */
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UNIV_INLINE
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void
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row_upd_rec_sys_fields(
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/*===================*/
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rec_t* rec, /* in/out: record */
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page_zip_des_t* page_zip,/* in/out: compressed page whose
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uncompressed part will be updated, or NULL */
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dict_index_t* index, /* in: clustered index */
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const ulint* offsets,/* in: rec_get_offsets(rec, index) */
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trx_t* trx, /* in: transaction */
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dulint roll_ptr)/* in: roll ptr of the undo log record */
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{
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ut_ad(dict_index_is_clust(index));
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ut_ad(rec_offs_validate(rec, index, offsets));
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#ifdef UNIV_SYNC_DEBUG
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if (!rw_lock_own(&btr_search_latch, RW_LOCK_EX)) {
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mutex_enter(&buf_pool->mutex);
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ut_ad(!buf_block_align(rec)->is_hashed);
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mutex_exit(&buf_pool->mutex);
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}
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#endif /* UNIV_SYNC_DEBUG */
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if (UNIV_LIKELY_NULL(page_zip)) {
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ulint pos = dict_index_get_sys_col_pos(index, DATA_TRX_ID);
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page_zip_write_trx_id_and_roll_ptr(page_zip, rec, offsets,
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pos, trx->id, roll_ptr);
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} else {
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ulint offset = index->trx_id_offset;
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if (!offset) {
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offset = row_get_trx_id_offset(rec, index, offsets);
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}
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#if DATA_TRX_ID + 1 != DATA_ROLL_PTR
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# error "DATA_TRX_ID + 1 != DATA_ROLL_PTR"
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#endif
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trx_write_trx_id(rec + offset, trx->id);
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trx_write_roll_ptr(rec + offset + DATA_TRX_ID_LEN, roll_ptr);
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}
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}
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