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8f07794024
and modify some functions to return const pointers. Add const qualifiers to local variable declarations or casts to remove the const qualifier in those places where write access is needed.
102 lines
2.6 KiB
Text
102 lines
2.6 KiB
Text
/******************************************************
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General row routines
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(c) 1996 Innobase Oy
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Created 4/20/1996 Heikki Tuuri
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*******************************************************/
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#include "dict0dict.h"
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#include "rem0rec.h"
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#include "trx0undo.h"
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/*************************************************************************
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Reads the trx id field from a clustered index record. */
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UNIV_INLINE
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dulint
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row_get_rec_trx_id(
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/*===============*/
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/* out: value of the field */
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rec_t* rec, /* in: record */
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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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{
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ulint offset;
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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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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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return(trx_read_trx_id(rec + offset));
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}
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/*************************************************************************
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Reads the roll pointer field from a clustered index record. */
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UNIV_INLINE
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dulint
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row_get_rec_roll_ptr(
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/*=================*/
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/* out: value of the field */
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rec_t* rec, /* in: record */
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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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{
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ulint offset;
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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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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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return(trx_read_roll_ptr(rec + offset + DATA_TRX_ID_LEN));
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}
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/***********************************************************************
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Builds from a secondary index record a row reference with which we can
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search the clustered index record. */
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UNIV_INLINE
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void
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row_build_row_ref_fast(
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/*===================*/
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dtuple_t* ref, /* in: typed data tuple where the
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reference is built */
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const ulint* map, /* in: array of field numbers in rec
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telling how ref should be built from
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the fields of rec */
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rec_t* rec, /* in: record in the index; must be
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preserved while ref is used, as we do
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not copy field values to heap */
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const ulint* offsets)/* in: array returned by rec_get_offsets() */
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{
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dfield_t* dfield;
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byte* field;
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ulint len;
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ulint ref_len;
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ulint field_no;
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ulint i;
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ut_ad(rec_offs_validate(rec, NULL, offsets));
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ref_len = dtuple_get_n_fields(ref);
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for (i = 0; i < ref_len; i++) {
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dfield = (dfield_t*) dtuple_get_nth_field(ref, i);
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field_no = *(map + i);
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if (field_no != ULINT_UNDEFINED) {
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field = rec_get_nth_field(rec, offsets,
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field_no, &len);
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dfield_set_data(dfield, field, len);
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}
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}
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}
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