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https://github.com/sqlite/sqlite.git
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Fixes to the locking and rollback behavior. (CVS 261)
FossilOrigin-Name: 337b3d3b2a903328d9744c111979909a284b8348
This commit is contained in:
drh
192
test/lock.test
192
test/lock.test
@ -11,82 +11,150 @@
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# This file implements regression tests for SQLite library. The
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# focus of this script is database locks.
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#
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# $Id: lock.test,v 1.10 2001/09/16 00:13:28 drh Exp $
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# $Id: lock.test,v 1.11 2001/09/23 02:35:53 drh Exp $
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if {0} {
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set testdir [file dirname $argv0]
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source $testdir/tester.tcl
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# Create a largish table
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# Create an alternative connection to the database
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#
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do_test lock-1.0 {
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execsql {CREATE TABLE big(f1 int, f2 int, f3 int)}
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set f [open ./testdata1.txt w]
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for {set i 1} {$i<=500} {incr i} {
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puts $f "$i\t[expr {$i*2}]\t[expr {$i*3}]"
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}
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close $f
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execsql {COPY big FROM './testdata1.txt'}
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file delete -force ./testdata1.txt
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sqlite db2 ./test.db
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} {}
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do_test lock-1.1 {
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# Create a background query that gives us a read lock on the big table
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#
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set f [open slow.sql w]
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puts $f "SELECT a.f1, b.f1 FROM big AS a, big AS B"
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puts $f "WHERE a.f1+b.f1==0.5;"
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close $f
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set ::lock_pid [exec ./sqlite testdb <slow.sql &]
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after 250
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set v {}
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execsql {SELECT name FROM sqlite_master WHERE type='table' ORDER BY name}
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} {}
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do_test lock-1.2 {
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execsql {SELECT name FROM sqlite_master WHERE type='table' ORDER BY name} db2
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} {}
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do_test lock-1.3 {
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execsql {CREATE TABLE t1(a int, b int)}
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execsql {SELECT name FROM sqlite_master WHERE type='table' ORDER BY name}
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} {t1}
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do_test lock-1.4 {
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set r [catch {execsql {
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SELECT name FROM sqlite_master WHERE type='table' ORDER BY name
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} db2} msg]
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lappend r $msg
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} {1 {database schema has changed}}
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do_test lock-1.5 {
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set r [catch {execsql {
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SELECT name FROM sqlite_master WHERE type='table' ORDER BY name
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} db2} msg]
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lappend r $msg
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} {0 t1}
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do_probtest lock-1.2 {
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# Now try to update the database
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#
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set v [catch {execsql {UPDATE big SET f2='xyz' WHERE f1=11}} msg]
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lappend v $msg
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} {1 {table big is locked}}
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do_test lock-1.6 {
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execsql {INSERT INTO t1 VALUES(1,2)}
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execsql {SELECT * FROM t1}
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} {1 2}
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do_test lock-1.7 {
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execsql {SELECT * FROM t1} db2
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} {1 2}
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do_test lock-1.8 {
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execsql {UPDATE t1 SET a=b, b=a} db2
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execsql {SELECT * FROM t1} db2
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} {2 1}
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do_test lock-1.9 {
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execsql {SELECT * FROM t1}
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} {2 1}
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do_probtest lock-1.3 {
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# Try to update the database in a separate process
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#
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set f [open update.sql w]
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puts $f ".timeout 0"
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puts $f "UPDATE big SET f2='xyz' WHERE f1=11;"
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puts $f "SELECT f2 FROM big WHERE f1=11;"
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close $f
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exec ./sqlite testdb <update.sql
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} "UPDATE big SET f2='xyz' WHERE f1=11;\nSQL error: table big is locked\n22"
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do_test lock-1.10 {
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execsql {BEGIN TRANSACTION}
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execsql {SELECT * FROM t1}
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} {2 1}
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do_test lock-1.11 {
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set r [catch {execsql {SELECT * FROM t1} db2} msg]
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lappend r $msg
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} {1 {database is locked}}
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do_test lock-1.12 {
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execsql {ROLLBACK}
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set r [catch {execsql {SELECT * FROM t1} db2} msg]
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lappend r $msg
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} {0 {2 1}}
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do_probtest lock-1.4 {
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# Try to update the database using a timeout
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#
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set f [open update.sql w]
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puts $f ".timeout 1000"
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puts $f "UPDATE big SET f2='xyz' WHERE f1=11;"
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puts $f "SELECT f2 FROM big WHERE f1=11;"
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close $f
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exec ./sqlite testdb <update.sql
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} "UPDATE big SET f2='xyz' WHERE f1=11;\nSQL error: table big is locked\n22"
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do_test lock-1.13 {
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execsql {CREATE TABLE t2(x int, y int)}
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execsql {INSERT INTO t2 VALUES(8,9)}
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execsql {SELECT * FROM t2}
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} {8 9}
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do_test lock-1.14 {
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set r [catch {execsql {SELECT * FROM t1} db2} msg]
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lappend r $msg
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} {1 {database schema has changed}}
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do_test lock-1.15 {
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set r [catch {execsql {SELECT * FROM t2} db2} msg]
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lappend r $msg
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} {0 {8 9}}
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do_probtest lock-1.5 {
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# Try to update the database using a timeout
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#
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set f [open update.sql w]
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puts $f ".timeout 10000"
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puts $f "UPDATE big SET f2='xyz' WHERE f1=11;"
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puts $f "SELECT f2 FROM big WHERE f1=11;"
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close $f
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exec ./sqlite testdb <update.sql
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} {xyz}
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do_test lock-1.16 {
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db eval {SELECT * FROM t1} qv {
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set x [db eval {SELECT * FROM t1}]
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}
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set x
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} {2 1}
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do_test lock-1.17 {
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db eval {SELECT * FROM t1} qv {
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set x [db eval {SELECT * FROM t2}]
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}
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set x
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} {8 9}
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catch {exec ps -uax | grep $::lock_pid}
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catch {exec kill -HUP $::lock_pid}
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catch {exec kill -9 $::lock_pid}
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# You cannot UPDATE a table from within the callback of a SELECT
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# on that same table because the SELECT has the table locked.
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#
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do_test lock-1.18 {
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db eval {SELECT * FROM t1} qv {
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set r [catch {db eval {UPDATE t1 SET a=b, b=a}} msg]
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lappend r $msg
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}
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set r
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} {1 {database table is locked}}
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# But you can UPDATE a different table from the one that is used in
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# the SELECT.
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#
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do_test lock-1.19 {
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db eval {SELECT * FROM t1} qv {
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set r [catch {db eval {UPDATE t2 SET x=y, y=x}} msg]
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lappend r $msg
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}
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set r
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} {0 {}}
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do_test lock-1.20 {
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execsql {SELECT * FROM t2}
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} {9 8}
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# It is possible to do a SELECT of the same table within the
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# callback of another SELECT on that same table because two
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# or more read-only cursors can be open at once.
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#
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do_test lock-1.21 {
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db eval {SELECT * FROM t1} qv {
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set r [catch {db eval {SELECT a FROM t1}} msg]
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lappend r $msg
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}
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set r
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} {0 2}
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# Under UNIX you can do two SELECTs at once with different database
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# connections, because UNIX supports reader/writer locks. Under windows,
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# this is not possible.
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#
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if {$::tcl_platform(platform)=="unix"} {
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do_test lock-1.22 {
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db eval {SELECT * FROM t1} qv {
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set r [catch {db2 eval {SELECT a FROM t1}} msg]
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lappend r $msg
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}
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set r
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} {0 2}
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}
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do_test lock-999.1 {
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rename db2 {}
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} {}
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finish_test
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}
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