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/*****************************************************************************
Copyright (c) 1994, 2014, Oracle and/or its affiliates. All Rights Reserved.
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/rem0cmp.ic
Comparison services for records
Created 7/1/1994 Heikki Tuuri
************************************************************************/
#include <mysql_com.h>
/** Compare two data fields.
@param[in] dfield1 data field; must have type field set
@param[in] dfield2 data field
@return the comparison result of dfield1 and dfield2
@retval 0 if dfield1 is equal to dfield2
@retval negative if dfield1 is less than dfield2
@retval positive if dfield1 is greater than dfield2 */
UNIV_INLINE
int
cmp_dfield_dfield(
const dfield_t* dfield1,
const dfield_t* dfield2)
{
const dtype_t* type;
ut_ad(dfield_check_typed(dfield1));
type = dfield_get_type(dfield1);
return(cmp_data_data(type->mtype, type->prtype,
(const byte*) dfield_get_data(dfield1),
dfield_get_len(dfield1),
(const byte*) dfield_get_data(dfield2),
dfield_get_len(dfield2)));
}
/** Compare two B-tree records.
Only the common first fields are compared, and externally stored field
are treated as equal.
@param[in] rec1 B-tree record
@param[in] rec2 B-tree record
@param[in] offsets1 rec_get_offsets(rec1, index)
@param[in] offsets2 rec_get_offsets(rec2, index)
@param[out] matched_fields number of completely matched fields
within the first field not completely matched
@return positive, 0, negative if rec1 is greater, equal, less, than rec2,
respectively */
UNIV_INLINE
int
cmp_rec_rec(
const rec_t* rec1,
const rec_t* rec2,
const ulint* offsets1,
const ulint* offsets2,
const dict_index_t* index,
ulint* matched_fields)
{
ulint match_f;
int ret;
ret = cmp_rec_rec_with_match(
rec1, rec2, offsets1, offsets2, index, false, &match_f);
if (matched_fields != NULL) {
*matched_fields = match_f;
}
return(ret);
}
/** Compare two data fields.
@param[in] dfield1 data field
@param[in] dfield2 data field
@return the comparison result of dfield1 and dfield2
@retval 0 if dfield1 is equal to dfield2, or a prefix of dfield1
@retval negative if dfield1 is less than dfield2
@retval positive if dfield1 is greater than dfield2 */
UNIV_INLINE
int
cmp_dfield_dfield_like_prefix(
const dfield_t* dfield1,
const dfield_t* dfield2)
{
const dtype_t* type;
ut_ad(dfield_check_typed(dfield1));
ut_ad(dfield_check_typed(dfield2));
type = dfield_get_type(dfield1);
#ifdef UNIV_DEBUG
switch (type->prtype & DATA_MYSQL_TYPE_MASK) {
case MYSQL_TYPE_BIT:
case MYSQL_TYPE_STRING:
case MYSQL_TYPE_VAR_STRING:
case MYSQL_TYPE_TINY_BLOB:
case MYSQL_TYPE_MEDIUM_BLOB:
case MYSQL_TYPE_BLOB:
case MYSQL_TYPE_LONG_BLOB:
case MYSQL_TYPE_VARCHAR:
break;
default:
ut_error;
}
#endif /* UNIV_DEBUG */
uint cs_num = (uint) dtype_get_charset_coll(type->prtype);
if (CHARSET_INFO* cs = get_charset(cs_num, MYF(MY_WME))) {
return(cs->coll->strnncoll(
cs,
static_cast<uchar*>(
dfield_get_data(dfield1)),
dfield_get_len(dfield1),
static_cast<uchar*>(
dfield_get_data(dfield2)),
dfield_get_len(dfield2),
1));
}
ib::fatal() << "Unable to find charset-collation " << cs_num;
return(0);
}
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