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/******************************************************
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 (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)));
}
/*************************************************************************
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 */
const ulint* offsets,/* in: rec_get_offsets(rec, index) */
trx_t* trx, /* in: transaction */
dulint roll_ptr)/* in: roll ptr of the undo log record */
{
ut_ad(index->type & DICT_CLUSTERED);
ut_ad(rec_offs_validate(rec, index, offsets));
#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, offsets, trx->id);
row_set_rec_roll_ptr(rec, index, offsets, roll_ptr);
}
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