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to the undo log, also store the original length of the column, so that the changes will be correctly undone in transaction rollback or when fetching previous versions of the row. innodb-zip.test: New file, for tests of the compression. upd_field_t: Add orig_len, the original length of new_val. btr_push_update_extern_fields(): Restore the original prefix of the column. Add the parameter heap where memory will be allocated if necessary. trx_undo_rec_get_col_val(): Add the output parameter orig_len. trx_undo_page_report_modify_ext(): New function: Write an externally stored column to the undo log. This is only called from trx_undo_page_report_modify(), and this is the only caller of trx_undo_page_fetch_ext(). trx_undo_update_rec_get_update(): Read the original length of the column prefix to upd_field->orig_len.
142 lines
3.9 KiB
Text
142 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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upd_field->orig_len = 0;
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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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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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buf_pool_mutex_enter();
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ut_ad(!buf_block_align(rec)->is_hashed);
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buf_pool_mutex_exit();
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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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