# 2007 December 20 # # 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. # #*********************************************************************** # # $Id: tkt2854.test,v 1.2 2008/05/20 13:17:28 shane Exp $ set testdir [file dirname $argv0] source $testdir/tester.tcl db close ifcapable !shared_cache { finish_test return } set ::enable_shared_cache [sqlite3_enable_shared_cache 1] # Open 3 database connections. Connection "db" and "db2" share a cache. # Connection "db3" has its own cache. # do_test tkt2854-1.1 { sqlite3 db test.db sqlite3 db2 test.db # This is taken from shared.test. The Windows VFS expands # ./test.db (and test.db) to be the same thing so the path # matches and they share a cache. By changing the case # for Windows platform, we get around this and get a separate # connection. if {$::tcl_platform(platform)=="unix"} { sqlite3 db3 ./test.db } else { sqlite3 db3 TEST.DB } db eval { CREATE TABLE abc(a, b, c); } } {} # Check that an exclusive lock cannot be obtained if some other # shared-cache connection has a read-lock on a table. # do_test tkt2854-1.2 { execsql { BEGIN; SELECT * FROM abc; } db2 } {} do_test tkt2854-1.3 { catchsql { BEGIN EXCLUSIVE } db } {1 {database is locked}} do_test tkt2854-1.4 { execsql { SELECT * FROM abc } db3 } {} do_test tkt2854-1.5 { catchsql { INSERT INTO abc VALUES(1, 2, 3) } db3 } {1 {database is locked}} do_test tkt2854-1.6 { execsql { COMMIT } db2 } {} # Check that an exclusive lock prevents other shared-cache users from # starting a transaction. # do_test tkt2854-1.7 { set ::DB2 [sqlite3_connection_pointer db2] set ::STMT1 [sqlite3_prepare $DB2 "SELECT * FROM abc" -1 TAIL] set ::STMT2 [sqlite3_prepare $DB2 "BEGIN EXCLUSIVE" -1 TAIL] set ::STMT3 [sqlite3_prepare $DB2 "BEGIN IMMEDIATE" -1 TAIL] set ::STMT4 [sqlite3_prepare $DB2 "BEGIN" -1 TAIL] set ::STMT5 [sqlite3_prepare $DB2 "COMMIT" -1 TAIL] execsql { BEGIN EXCLUSIVE } db } {} do_test tkt2854-1.8 { catchsql { BEGIN EXCLUSIVE } db2 } {1 {database schema is locked: main}} do_test tkt2854-1.9 { catchsql { BEGIN IMMEDIATE } db2 } {1 {database schema is locked: main}} do_test tkt2854-1.10 { # This fails because the schema of main cannot be verified. catchsql { BEGIN } db2 } {1 {database schema is locked: main}} # Check that an exclusive lock prevents other shared-cache users from # reading the database. Use stored statements so that the error occurs # at the b-tree level, not the schema level. # do_test tkt2854-1.11 { list [sqlite3_step $::STMT1] [sqlite3_finalize $::STMT1] } {SQLITE_ERROR SQLITE_LOCKED} do_test tkt2854-1.12 { list [sqlite3_step $::STMT2] [sqlite3_finalize $::STMT2] } {SQLITE_BUSY SQLITE_BUSY} do_test tkt2854-1.13 { list [sqlite3_step $::STMT3] [sqlite3_finalize $::STMT3] } {SQLITE_BUSY SQLITE_BUSY} do_test tkt2854-1.14 { # A regular "BEGIN" doesn't touch any databases. So it succeeds. list [sqlite3_step $::STMT4] [sqlite3_finalize $::STMT4] } {SQLITE_DONE SQLITE_OK} do_test tkt2854-1.15 { # As does a COMMIT. list [sqlite3_step $::STMT5] [sqlite3_finalize $::STMT5] } {SQLITE_DONE SQLITE_OK} # Try to read the database using connection "db3" (which does not share # a cache with "db"). The database should be locked. do_test tkt2854-1.16 { catchsql { SELECT * FROM abc } db3 } {1 {database is locked}} do_test tkt2854-1.17 { execsql { COMMIT } db } {} do_test tkt2854-1.18 { execsql { SELECT * FROM abc } db2 } {} # Check that if an attempt to obtain an exclusive lock fails because an # attached db cannot be locked, the internal exclusive flag used by # shared-cache users is correctly cleared. do_test tkt2854-1.19 { file delete -force test2.db test2.db-journal sqlite3 db4 test2.db execsql { CREATE TABLE def(d, e, f) } db4 execsql { ATTACH 'test2.db' AS aux } db } {} do_test tkt2854-1.20 { execsql {BEGIN IMMEDIATE} db4 catchsql {BEGIN EXCLUSIVE} db } {1 {database is locked}} do_test tkt2854-1.21 { execsql {SELECT * FROM abc} db2 } {} db close db2 close db3 close db4 close sqlite3_enable_shared_cache $::enable_shared_cache finish_test