xref: /sqlite-3.40.0/test/jrnlmode2.test (revision 69aedc8d) 
1# 2009 March 24
2#
3# The author disclaims copyright to this source code.  In place of
4# a legal notice, here is a blessing:
5#
6#    May you do good and not evil.
7#    May you find forgiveness for yourself and forgive others.
8#    May you share freely, never taking more than you give.
9#
10#***********************************************************************
11#
12
13set testdir [file dirname $argv0]
14source $testdir/tester.tcl
15
16ifcapable {!pager_pragmas} {
17  finish_test
18  return
19}
20
21if {[atomic_batch_write test.db]} {
22  finish_test
23  return
24}
25
26#-------------------------------------------------------------------------
27# The tests in this file check that the following two bugs (both now fixed)
28# do not reappear.
29#
30# jrnlmode2-1.*: Demonstrate bug #3745:
31#
32#     In persistent journal mode, if:
33#
34#       * There is a persistent journal in the file-system, AND
35#       * there exists a connection with a shared lock on the db file,
36#
37#     then a second connection cannot open a read-transaction on the database.
38#     The reason is because while determining that the persistent-journal is
39#     not a hot-journal, SQLite currently grabs an exclusive lock on the
40#     database file. If this fails because another connection has a shared
41#     lock, then SQLITE_BUSY is returned to the user.
42#
43# jrnlmode2-2.*: Demonstrate bug #3751:
44#
45#     If a connection is opened in SQLITE_OPEN_READONLY mode, the underlying
46#     unix file descriptor on the database file is opened in O_RDONLY mode.
47#
48#     When SQLite queries the database file for the schema in order to compile
49#     the SELECT statement, it sees the empty journal in the file system, it
50#     attempts to obtain an exclusive lock on the database file (this is a
51#     bug). The attempt to obtain an exclusive (write) lock on a read-only file
52#     fails at the OS level. Under unix, fcntl() reports an EBADF - "Bad file
53#     descriptor" - error.
54#
55
56do_test jrnlmode2-1.1 {
57  execsql {
58    PRAGMA journal_mode = persist;
59    CREATE TABLE t1(a, b);
60    INSERT INTO t1 VALUES(1, 2);
61  }
62} {persist}
63
64do_test jrnlmode2-1.2 {
65  file exists test.db-journal
66} {1}
67
68do_test jrnlmode2-1.3 {
69  sqlite3 db2 test.db
70  execsql { SELECT * FROM t1 } db2
71} {1 2}
72
73do_test jrnlmode2-1.4 {
74  execsql {
75    INSERT INTO t1 VALUES(3, 4);
76  }
77  execsql {
78    BEGIN;
79    SELECT * FROM t1;
80  }
81  execsql { PRAGMA lock_status }
82} {main shared temp closed}
83
84do_test jrnlmode2-1.5 {
85  file exists test.db-journal
86} {1}
87
88do_test jrnlmode2-1.6 {
89  catchsql { SELECT * FROM t1 } db2
90} {0 {1 2 3 4}}
91
92do_test jrnlmode2-1.7 {
93  execsql { COMMIT }
94  catchsql { SELECT * FROM t1 } db2
95} {0 {1 2 3 4}}
96
97
98
99do_test jrnlmode2-2.1 {
100  db2 close
101  execsql { PRAGMA journal_mode = truncate }
102  execsql { INSERT INTO t1 VALUES(5, 6) }
103} {}
104
105do_test jrnlmode2-2.2 {
106  file exists test.db-journal
107} {1}
108
109do_test jrnlmode2-2.3 {
110  file size test.db-journal
111} {0}
112
113do_test jrnlmode2-2.4 {
114  sqlite3 db2 test.db -readonly 1
115  catchsql { SELECT * FROM t1 } db2
116} {0 {1 2 3 4 5 6}}
117
118do_test jrnlmode2-2.5 {
119  db close
120  delete_file test.db-journal
121} {}
122do_test jrnlmode2-2.6 {
123  sqlite3 db2 test.db -readonly 1
124  catchsql { SELECT * FROM t1 } db2
125} {0 {1 2 3 4 5 6}}
126
127catch { db2 close }
128finish_test
129