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/*****************************************************************************
Copyright (c) 1996, 2015, Oracle and/or its affiliates. All Rights Reserved.
Copyright (c) 2017, 2018, MariaDB Corporation.
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA
*****************************************************************************/
/**************************************************//**
@file include/row0row.ic
General row routines
Created 4/20/1996 Heikki Tuuri
*******************************************************/
#include "dict0dict.h"
#include "rem0rec.h"
#include "trx0undo.h"
/*********************************************************************//**
Gets the offset of the DB_TRX_ID field, in bytes relative to the origin of
a clustered index record.
@return offset of DATA_TRX_ID */
UNIV_INLINE
ulint
row_get_trx_id_offset(
/*==================*/
const dict_index_t* index, /*!< in: clustered index */
const ulint* offsets)/*!< in: record offsets */
{
ulint offset;
ulint len;
ut_ad(rec_offs_validate(NULL, index, offsets));
offset = rec_get_nth_field_offs(offsets, index->db_trx_id(), &len);
ut_ad(len == DATA_TRX_ID_LEN);
return(offset);
}
/*********************************************************************//**
Reads the trx id field from a clustered index record.
@return value of the field */
UNIV_INLINE
trx_id_t
row_get_rec_trx_id(
/*===============*/
const rec_t* rec, /*!< in: record */
const dict_index_t* index, /*!< in: clustered index */
const ulint* offsets)/*!< in: rec_get_offsets(rec, index) */
{
ulint offset;
ut_ad(dict_index_is_clust(index));
ut_ad(rec_offs_validate(rec, index, offsets));
offset = index->trx_id_offset;
if (!offset) {
offset = row_get_trx_id_offset(index, offsets);
}
return(trx_read_trx_id(rec + offset));
}
/*********************************************************************//**
Reads the roll pointer field from a clustered index record.
@return value of the field */
UNIV_INLINE
roll_ptr_t
row_get_rec_roll_ptr(
/*=================*/
const rec_t* rec, /*!< in: record */
const dict_index_t* index, /*!< in: clustered index */
const ulint* offsets)/*!< in: rec_get_offsets(rec, index) */
{
ulint offset;
ut_ad(dict_index_is_clust(index));
ut_ad(rec_offs_validate(rec, index, offsets));
offset = index->trx_id_offset;
if (!offset) {
offset = row_get_trx_id_offset(index, offsets);
}
return(trx_read_roll_ptr(rec + offset + DATA_TRX_ID_LEN));
}
/*****************************************************************//**
When an insert or purge to a table is performed, this function builds
the entry to be inserted into or purged from an index on the table.
@return index entry which should be inserted or purged, or NULL if the
externally stored columns in the clustered index record are
unavailable and ext != NULL */
UNIV_INLINE
dtuple_t*
row_build_index_entry(
/*==================*/
const dtuple_t* row, /*!< in: row which should be
inserted or purged */
const row_ext_t* ext, /*!< in: externally stored column
prefixes, or NULL */
const dict_index_t* index, /*!< in: index on the table */
mem_heap_t* heap) /*!< in,out: memory heap from which
the memory for the index entry
is allocated */
{
dtuple_t* entry;
ut_ad(dtuple_check_typed(row));
entry = row_build_index_entry_low(row, ext, index, heap,
ROW_BUILD_NORMAL);
ut_ad(!entry || dtuple_check_typed(entry));
return(entry);
}
/*******************************************************************//**
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/out: typed data tuple where the
reference is built */
const ulint* map, /*!< in: array of field numbers in rec
telling how ref should be built from
the fields of rec */
const rec_t* rec, /*!< in: secondary index record;
must be preserved while ref is used, as we do
not copy field values to heap */
const ulint* offsets)/*!< in: array returned by rec_get_offsets() */
{
dfield_t* dfield;
const byte* field;
ulint len;
ulint ref_len;
ulint field_no;
ulint i;
ut_ad(rec_offs_validate(rec, NULL, offsets));
ut_ad(!rec_offs_any_extern(offsets));
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, offsets,
field_no, &len);
dfield_set_data(dfield, field, len);
}
}
}
/** Parse the integer data from specified data, which could be
DATA_INT, DATA_FLOAT or DATA_DOUBLE. If the value is less than 0
and the type is not unsigned then we reset the value to 0
@param[in] data data to read
@param[in] len length of data
@param[in] mtype mtype of data
@param[in] unsigned_type if the data is unsigned
@return the integer value from the data */
ib_uint64_t
row_parse_int(
const byte* data,
ulint len,
ulint mtype,
bool unsigned_type)
{
ib_uint64_t value = 0;
switch (mtype) {
case DATA_INT:
ut_a(len <= sizeof value);
value = mach_read_int_type(data, len, unsigned_type);
break;
case DATA_FLOAT:
ut_a(len == sizeof(float));
value = static_cast<ib_uint64_t>(mach_float_read(data));
break;
case DATA_DOUBLE:
ut_a(len == sizeof(double));
value = static_cast<ib_uint64_t>(mach_double_read(data));
break;
default:
ut_error;
}
if (!unsigned_type && static_cast<int64_t>(value) < 0) {
value = 0;
}
return(value);
}
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