row0upd.ic
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:3k
- /******************************************************
- Update of a row
- (c) 1996 Innobase Oy
- Created 12/27/1996 Heikki Tuuri
- *******************************************************/
- #include "mtr0log.h"
- #include "trx0trx.h"
- #include "trx0undo.h"
- #include "row0row.h"
- #include "btr0sea.h"
- /*************************************************************************
- Creates an update vector object. */
- UNIV_INLINE
- upd_t*
- upd_create(
- /*=======*/
- /* out, own: update vector object */
- ulint n, /* in: number of fields */
- mem_heap_t* heap) /* in: heap from which memory allocated */
- {
- upd_t* update;
- ulint i;
- update = mem_heap_alloc(heap, sizeof(upd_t));
- update->info_bits = 0;
- update->n_fields = n;
- update->fields = mem_heap_alloc(heap, sizeof(upd_field_t) * n);
- for (i = 0; i < n; i++) {
- update->fields[i].extern_storage = 0;
- }
-
- return(update);
- }
- /*************************************************************************
- Returns the number of fields in the update vector == number of columns
- to be updated by an update vector. */
- UNIV_INLINE
- ulint
- upd_get_n_fields(
- /*=============*/
- /* out: number of fields */
- upd_t* update) /* in: update vector */
- {
- ut_ad(update);
- return(update->n_fields);
- }
- /*************************************************************************
- Returns the nth field of an update vector. */
- UNIV_INLINE
- upd_field_t*
- upd_get_nth_field(
- /*==============*/
- /* out: update vector field */
- upd_t* update, /* in: update vector */
- ulint n) /* in: field position in update vector */
- {
- ut_ad(update);
- ut_ad(n < update->n_fields);
- return(update->fields + n);
- }
- /*************************************************************************
- 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;
- if (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 fieldsn",
- (ulong) dict_index_get_n_fields(index));
- }
- dtype_copy(dfield_get_type(&(upd_field->new_val)),
- dict_index_get_nth_type(index, field_no));
- }
- /*************************************************************************
- 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: record */
- dict_index_t* index, /* in: clustered index */
- trx_t* trx, /* in: transaction */
- dulint roll_ptr)/* in: roll ptr of the undo log record */
- {
- ut_ad(index->type & DICT_CLUSTERED);
- #ifdef UNIV_SYNC_DEBUG
- ut_ad(!buf_block_align(rec)->is_hashed
- || rw_lock_own(&btr_search_latch, RW_LOCK_EX));
- #endif /* UNIV_SYNC_DEBUG */
- row_set_rec_trx_id(rec, index, trx->id);
- row_set_rec_roll_ptr(rec, index, roll_ptr);
- }