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
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
/************************************************************************
The page cursor
(c) 1994-1996 Innobase Oy
Created 10/4/1994 Heikki Tuuri
*************************************************************************/
#include "page0page.h"
/*************************************************************
Gets pointer to the page frame where the cursor is positioned. */
UNIV_INLINE
page_t*
page_cur_get_page(
/*==============*/
/* out: page */
page_cur_t* cur) /* in: page cursor */
{
ut_ad(cur);
return(buf_frame_align(cur->rec));
}
/*************************************************************
Gets the record where the cursor is positioned. */
UNIV_INLINE
rec_t*
page_cur_get_rec(
/*=============*/
/* out: record */
page_cur_t* cur) /* in: page cursor */
{
ut_ad(cur);
return(cur->rec);
}
/*************************************************************
Sets the cursor object to point before the first user record
on the page. */
UNIV_INLINE
void
page_cur_set_before_first(
/*======================*/
page_t* page, /* in: index page */
page_cur_t* cur) /* in: cursor */
{
cur->rec = page_get_infimum_rec(page);
}
/*************************************************************
Sets the cursor object to point after the last user record on
the page. */
UNIV_INLINE
void
page_cur_set_after_last(
/*====================*/
page_t* page, /* in: index page */
page_cur_t* cur) /* in: cursor */
{
cur->rec = page_get_supremum_rec(page);
}
/*************************************************************
Returns TRUE if the cursor is before first user record on page. */
UNIV_INLINE
ibool
page_cur_is_before_first(
/*=====================*/
/* out: TRUE if at start */
page_cur_t* cur) /* in: cursor */
{
if (page_get_infimum_rec(page_cur_get_page(cur)) == cur->rec) {
return(TRUE);
}
return(FALSE);
}
/*************************************************************
Returns TRUE if the cursor is after last user record. */
UNIV_INLINE
ibool
page_cur_is_after_last(
/*===================*/
/* out: TRUE if at end */
page_cur_t* cur) /* in: cursor */
{
if (page_get_supremum_rec(page_cur_get_page(cur)) == cur->rec) {
return(TRUE);
}
return(FALSE);
}
/**************************************************************
Positions the cursor on the given record. */
UNIV_INLINE
void
page_cur_position(
/*==============*/
rec_t* rec, /* in: record on a page */
page_cur_t* cur) /* in: page cursor */
{
ut_ad(rec && cur);
cur->rec = rec;
}
/**************************************************************
Invalidates a page cursor by setting the record pointer NULL. */
UNIV_INLINE
void
page_cur_invalidate(
/*================*/
page_cur_t* cur) /* in: page cursor */
{
ut_ad(cur);
cur->rec = NULL;
}
/**************************************************************
Moves the cursor to the next record on page. */
UNIV_INLINE
void
page_cur_move_to_next(
/*==================*/
page_cur_t* cur) /* in: cursor; must not be after last */
{
ut_ad(!page_cur_is_after_last(cur));
cur->rec = page_rec_get_next(cur->rec);
}
/**************************************************************
Moves the cursor to the previous record on page. */
UNIV_INLINE
void
page_cur_move_to_prev(
/*==================*/
page_cur_t* cur) /* in: page cursor, not before first */
{
ut_ad(!page_cur_is_before_first(cur));
cur->rec = page_rec_get_prev(cur->rec);
}
/********************************************************************
Searches the right position for a page cursor. */
UNIV_INLINE
ulint
page_cur_search(
/*============*/
/* out: number of matched fields on the left */
page_t* page, /* in: index page */
dict_index_t* index, /* in: record descriptor */
dtuple_t* tuple, /* in: data tuple */
ulint mode, /* in: PAGE_CUR_L, PAGE_CUR_LE, PAGE_CUR_G,
or PAGE_CUR_GE */
page_cur_t* cursor) /* out: page cursor */
{
ulint low_matched_fields = 0;
ulint low_matched_bytes = 0;
ulint up_matched_fields = 0;
ulint up_matched_bytes = 0;
ut_ad(dtuple_check_typed(tuple));
page_cur_search_with_match(page, index, tuple, mode,
&up_matched_fields,
&up_matched_bytes,
&low_matched_fields,
&low_matched_bytes,
cursor);
return(low_matched_fields);
}
/***************************************************************
Inserts a record next to page cursor. Returns pointer to inserted record if
succeed, i.e., enough space available, NULL otherwise. The cursor stays at
the same position. */
UNIV_INLINE
rec_t*
page_cur_tuple_insert(
/*==================*/
/* out: pointer to record if succeed, NULL
otherwise */
page_cur_t* cursor, /* in: a page cursor */
dtuple_t* tuple, /* in: pointer to a data tuple */
dict_index_t* index, /* in: record descriptor */
mtr_t* mtr) /* in: mini-transaction handle */
{
return(page_cur_insert_rec_low(cursor, tuple, index, NULL, NULL, mtr));
}
/***************************************************************
Inserts a record next to page cursor. Returns pointer to inserted record if
succeed, i.e., enough space available, NULL otherwise. The cursor stays at
the same position. */
UNIV_INLINE
rec_t*
page_cur_rec_insert(
/*================*/
/* out: pointer to record if succeed, NULL
otherwise */
page_cur_t* cursor, /* in: a page cursor */
rec_t* rec, /* in: record to insert */
dict_index_t* index, /* in: record descriptor */
ulint* offsets,/* in: rec_get_offsets(rec, index) */
mtr_t* mtr) /* in: mini-transaction handle */
{
return(page_cur_insert_rec_low(cursor, NULL, index, rec,
offsets, mtr));
}
|
