row0row.ic
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:4k
- /******************************************************
- General row routines
- (c) 1996 Innobase Oy
- Created 4/20/1996 Heikki Tuuri
- *******************************************************/
- #include "dict0dict.h"
- #include "rem0rec.h"
- #include "trx0undo.h"
- /*************************************************************************
- Reads the trx id or roll ptr field from a clustered index record: this function
- is slower than the specialized inline functions. */
- dulint
- row_get_rec_sys_field(
- /*==================*/
- /* out: value of the field */
- ulint type, /* in: DATA_TRX_ID or DATA_ROLL_PTR */
- rec_t* rec, /* in: record */
- dict_index_t* index); /* in: clustered index */
- /*************************************************************************
- Sets the trx id or roll ptr field in a clustered index record: this function
- is slower than the specialized inline functions. */
- void
- row_set_rec_sys_field(
- /*==================*/
- /* out: value of the field */
- ulint type, /* in: DATA_TRX_ID or DATA_ROLL_PTR */
- rec_t* rec, /* in: record */
- dict_index_t* index, /* in: clustered index */
- dulint val); /* in: value to set */
- /*************************************************************************
- Reads the trx id field from a clustered index record. */
- UNIV_INLINE
- dulint
- row_get_rec_trx_id(
- /*===============*/
- /* out: value of the field */
- rec_t* rec, /* in: record */
- dict_index_t* index) /* in: clustered index */
- {
- ulint offset;
- ut_ad(index->type & DICT_CLUSTERED);
- offset = index->trx_id_offset;
-
- if (offset) {
- return(trx_read_trx_id(rec + offset));
- } else {
- return(row_get_rec_sys_field(DATA_TRX_ID, rec, index));
- }
- }
- /*************************************************************************
- Reads the roll pointer field from a clustered index record. */
- UNIV_INLINE
- dulint
- row_get_rec_roll_ptr(
- /*=================*/
- /* out: value of the field */
- rec_t* rec, /* in: record */
- dict_index_t* index) /* in: clustered index */
- {
- ulint offset;
- ut_ad(index->type & DICT_CLUSTERED);
- offset = index->trx_id_offset;
-
- if (offset) {
- return(trx_read_roll_ptr(rec + offset + DATA_TRX_ID_LEN));
- } else {
- return(row_get_rec_sys_field(DATA_ROLL_PTR, rec, index));
- }
- }
- /*************************************************************************
- Writes the trx id field to a clustered index record. */
- UNIV_INLINE
- void
- row_set_rec_trx_id(
- /*===============*/
- rec_t* rec, /* in: record */
- dict_index_t* index, /* in: clustered index */
- dulint trx_id) /* in: value of the field */
- {
- ulint offset;
- ut_ad(index->type & DICT_CLUSTERED);
- offset = index->trx_id_offset;
-
- if (offset) {
- trx_write_trx_id(rec + offset, trx_id);
- } else {
- row_set_rec_sys_field(DATA_TRX_ID, rec, index, trx_id);
- }
- }
- /*************************************************************************
- Sets the roll pointer field in a clustered index record. */
- UNIV_INLINE
- void
- row_set_rec_roll_ptr(
- /*=================*/
- rec_t* rec, /* in: record */
- dict_index_t* index, /* in: clustered index */
- dulint roll_ptr)/* in: value of the field */
- {
- ulint offset;
- ut_ad(index->type & DICT_CLUSTERED);
- offset = index->trx_id_offset;
-
- if (offset) {
- trx_write_roll_ptr(rec + offset + DATA_TRX_ID_LEN, roll_ptr);
- } else {
- row_set_rec_sys_field(DATA_ROLL_PTR, rec, index, roll_ptr);
- }
- }
- /***********************************************************************
- Builds from a secondary index record a row reference with which we can
- search the clustered index record. */
- UNIV_INLINE
- void
- row_build_row_ref_fast(
- /*===================*/
- dtuple_t* ref, /* in: typed data tuple where the reference
- is built */
- ulint* map, /* in: array of field numbers in rec telling
- how ref should be built from the fields of
- rec */
- rec_t* rec) /* in: record in the index; must be preserved
- while ref is used, as we do not copy field
- values to heap */
- {
- dfield_t* dfield;
- byte* field;
- ulint len;
- ulint ref_len;
- ulint field_no;
- ulint i;
-
- ref_len = dtuple_get_n_fields(ref);
-
- for (i = 0; i < ref_len; i++) {
- dfield = dtuple_get_nth_field(ref, i);
- field_no = *(map + i);
- if (field_no != ULINT_UNDEFINED) {
- field = rec_get_nth_field(rec, field_no, &len);
- dfield_set_data(dfield, field, len);
- }
- }
- }