1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
|
/*****************************************************************************
Copyright (c) 2017, 2025, Oracle and/or its affiliates.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.
This program is designed to work with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have either included with
the program or referenced in the documentation.
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, version 2.0, 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*****************************************************************************/
#include "lob0undo.h"
#include "dict0dict.h"
#include "sql-common/json_binary.h"
namespace lob {
/** Apply the undo information to the given LOB.
@param[in] index clustered index containing the LOB.
@param[in] lob_mem LOB on which the given undo will be
applied.
@param[in] len length of LOB.
@param[in] lob_version lob version number
@param[in] first_page_no the first page number of lob */
void undo_data_t::apply(dict_index_t *index, byte *lob_mem, size_t len,
size_t lob_version, page_no_t first_page_no) {
DBUG_TRACE;
DBUG_LOG("undo_data_t", "lob_version=" << lob_version);
#ifdef UNIV_DEBUG
if (!dict_table_has_atomic_blobs(index->table)) {
/* For compact and redundant row format, remove the local
prefix length from the offset. */
ut_ad(m_offset >= DICT_ANTELOPE_MAX_INDEX_COL_LEN);
}
#endif /* UNIV_DEBUG */
/* Ensure that the undo log applied on the LOB is matching. */
if (first_page_no == m_page_no) {
byte *ptr = lob_mem + m_offset;
ut_ad((m_offset + m_length) <= len);
memcpy(ptr, m_old_data, m_length);
}
}
std::ostream &undo_data_t::print(std::ostream &out) const {
out << "[undo_data_t: m_version=" << m_version << ", m_offset=" << m_offset
<< ", m_length=" << m_length
<< ", m_old_data=" << PrintBuffer(m_old_data, m_length) << "]";
return (out);
}
/** Copy the old data from the undo page into this object.
@param[in] undo_ptr the pointer into the undo log record.
@param[in] len length of the old data.
@return pointer past the old data. */
const byte *undo_data_t::copy_old_data(const byte *undo_ptr, ulint len) {
m_length = len;
m_old_data =
ut::new_arr_withkey<byte>(UT_NEW_THIS_FILE_PSI_KEY, ut::Count{m_length});
if (m_old_data == nullptr) {
return (nullptr);
}
memcpy(m_old_data, undo_ptr, m_length);
return (undo_ptr + m_length);
}
/** Free allocated memory for old data. */
void undo_data_t::destroy() {
if (m_old_data != nullptr) {
ut::delete_arr(m_old_data);
m_old_data = nullptr;
}
}
} /* namespace lob */
|
