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
|
/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
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; either version 2 of the License, or
(at your option) any later version.
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#ifdef USE_PRAGMA_INTERFACE
#pragma interface /* gcc class implementation */
#endif
/* class for the the myisam handler */
#include <nisam.h>
class ha_isam: public handler
{
N_INFO *file;
/* We need this as table_flags() may change after open() */
ulong int_table_flags;
public:
ha_isam(TABLE *table)
:handler(table), file(0),
int_table_flags(HA_READ_RND_SAME |
HA_DUPP_POS | HA_NOT_DELETE_WITH_CACHE | HA_FILE_BASED)
{}
~ha_isam() {}
ulong index_flags(uint idx, uint part, bool all_parts) const
{ return HA_READ_NEXT; } // but no HA_READ_PREV here!!!
const char *table_type() const { return "ISAM"; }
const char *index_type(uint key_number) { return "BTREE"; }
const char **bas_ext() const;
ulong table_flags() const { return int_table_flags; }
uint max_supported_record_length() const { return HA_MAX_REC_LENGTH; }
uint max_supported_keys() const { return N_MAXKEY; }
uint max_supported_key_parts() const { return N_MAXKEY_SEG; }
uint max_supported_key_length() const { return N_MAX_KEY_LENGTH; }
uint min_record_length(uint options) const;
bool low_byte_first() const { return 0; }
int open(const char *name, int mode, uint test_if_locked);
int close(void);
int write_row(byte * buf);
int update_row(const byte * old_data, byte * new_data);
int delete_row(const byte * buf);
int index_read(byte * buf, const byte * key,
uint key_len, enum ha_rkey_function find_flag);
int index_read_idx(byte * buf, uint idx, const byte * key,
uint key_len, enum ha_rkey_function find_flag);
int index_read_last(byte * buf, const byte * key, uint key_len);
int index_next(byte * buf);
int index_prev(byte * buf);
int index_first(byte * buf);
int index_last(byte * buf);
int rnd_init(bool scan);
int rnd_next(byte *buf);
int rnd_pos(byte * buf, byte *pos);
void position(const byte *record);
int info(uint);
int extra(enum ha_extra_function operation);
int external_lock(THD *thd, int lock_type);
ha_rows records_in_range(uint inx, key_range *min_key, key_range *max_key);
int create(const char *name, TABLE *form, HA_CREATE_INFO *create_info);
THR_LOCK_DATA **store_lock(THD *thd, THR_LOCK_DATA **to,
enum thr_lock_type lock_type);
};
|
