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
|
# 2018 August 6
#
# The author disclaims copyright to this source code. In place of
# a legal notice, here is a blessing:
#
# May you do good and not evil.
# May you find forgiveness for yourself and forgive others.
# May you share freely, never taking more than you give.
#
#***********************************************************************
#
# Tests for calling sqlite3_snapshot_open() when there is already
# a read transaction open on the database.
#
set testdir [file dirname $argv0]
source $testdir/tester.tcl
ifcapable !snapshot {finish_test; return}
set testprefix snapshot_up
# This test does not work with the inmemory_journal permutation. The reason
# is that each connection opened as part of this permutation executes
# "PRAGMA journal_mode=memory", which fails if the database is in wal mode
# and there are one or more existing connections.
if {[permutation]=="inmemory_journal"} {
finish_test
return
}
db timeout 1000
do_execsql_test 1.0 {
CREATE TABLE t1(a, b, c);
PRAGMA journal_mode = wal;
INSERT INTO t1 VALUES(1, 2, 3);
INSERT INTO t1 VALUES(4, 5, 6);
INSERT INTO t1 VALUES(7, 8, 9);
} {wal}
do_test 1.1 {
execsql BEGIN
set ::snap1 [sqlite3_snapshot_get db main]
execsql COMMIT
execsql { INSERT INTO t1 VALUES(10, 11, 12); }
execsql BEGIN
set ::snap2 [sqlite3_snapshot_get db main]
execsql COMMIT
execsql { INSERT INTO t1 VALUES(13, 14, 15); }
execsql BEGIN
set ::snap3 [sqlite3_snapshot_get db main]
execsql COMMIT
} {}
do_execsql_test 1.2 {
BEGIN;
SELECT * FROM t1
} {1 2 3 4 5 6 7 8 9 10 11 12 13 14 15}
do_test 1.3 {
sqlite3_snapshot_open db main $::snap1
execsql { SELECT * FROM t1 }
} {1 2 3 4 5 6 7 8 9}
do_test 1.4 {
sqlite3_snapshot_open db main $::snap2
execsql { SELECT * FROM t1 }
} {1 2 3 4 5 6 7 8 9 10 11 12}
do_test 1.5 {
sqlite3 db2 test.db
execsql { PRAGMA wal_checkpoint } db2
} {0 5 4}
do_execsql_test 1.6 {
SELECT * FROM t1
} {1 2 3 4 5 6 7 8 9 10 11 12}
do_test 1.7 {
list [catch { sqlite3_snapshot_open db main $::snap1 } msg] $msg
} {1 SQLITE_ERROR_SNAPSHOT}
do_execsql_test 1.8 {
SELECT * FROM t1
} {1 2 3 4 5 6 7 8 9 10 11 12}
do_test 1.9 {
execsql { COMMIT ; BEGIN }
list [catch { sqlite3_snapshot_open db main $::snap1 } msg] $msg
} {1 SQLITE_ERROR_SNAPSHOT}
do_test 1.10 {
execsql { COMMIT }
execsql {
PRAGMA wal_checkpoint;
DELETE FROM t1 WHERE a = 1;
} db2
execsql BEGIN
set ::snap4 [sqlite3_snapshot_get db main]
execsql COMMIT
execsql {
DELETE FROM t1 WHERE a = 4;
} db2
} {}
do_test 1.11 {
execsql {
BEGIN;
SELECT * FROM t1
}
} {7 8 9 10 11 12 13 14 15}
do_test 1.12 {
sqlite3_snapshot_open db main $::snap4
execsql { SELECT * FROM t1 }
} {4 5 6 7 8 9 10 11 12 13 14 15}
do_test 1.13 {
list [catch { sqlite3_snapshot_open db main $::snap3 } msg] $msg
} {1 SQLITE_ERROR_SNAPSHOT}
do_test 1.14 {
execsql { SELECT * FROM t1 }
} {4 5 6 7 8 9 10 11 12 13 14 15}
db close
db2 close
sqlite3 db test.db
do_execsql_test 1.15 {
BEGIN;
SELECT * FROM t1
} {7 8 9 10 11 12 13 14 15}
do_test 1.16 {
list [catch { sqlite3_snapshot_open db main $::snap4 } msg] $msg
} {1 SQLITE_ERROR_SNAPSHOT}
do_execsql_test 1.17 { COMMIT }
sqlite3_snapshot_free $::snap1
sqlite3_snapshot_free $::snap2
sqlite3_snapshot_free $::snap3
sqlite3_snapshot_free $::snap4
#-------------------------------------------------------------------------
catch { db close }
sqlite3 db test.db
sqlite3 db2 test.db
sqlite3 db3 test.db
proc xBusy {args} { return 1 }
db3 busy xBusy
do_test 2.1 {
execsql { INSERT INTO t1 VALUES(16, 17, 18) } db2
execsql BEGIN
set ::snap1 [sqlite3_snapshot_get db main]
execsql COMMIT
execsql { INSERT INTO t1 VALUES(19, 20, 21) } db2
execsql BEGIN
set ::snap2 [sqlite3_snapshot_get db main]
execsql COMMIT
set {} {}
} {}
do_execsql_test -db db2 2.2 {
BEGIN;
INSERT INTO t1 VALUES(19, 20, 21);
}
do_test 2.3 {
execsql BEGIN
sqlite3_snapshot_open db main $::snap1
execsql { SELECT * FROM t1 }
} {7 8 9 10 11 12 13 14 15 16 17 18}
proc xBusy {args} {
set ::res [list [catch { sqlite3_snapshot_open db main $::snap2 } msg] $msg]
return 1
}
db3 busy xBusy
do_test 2.4 {
execsql {PRAGMA wal_checkpoint = restart} db3
set ::res
} {1 SQLITE_BUSY}
sqlite3_snapshot_free $::snap1
sqlite3_snapshot_free $::snap2
finish_test
|
