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sqlite3

    1: # 2007 December 20
    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: # $Id: tkt2854.test,v 1.1.1.1 2012/02/21 17:04:16 misho Exp $
   13: 
   14: set testdir [file dirname $argv0]
   15: source $testdir/tester.tcl
   16: db close
   17: 
   18: ifcapable !shared_cache {
   19:   finish_test
   20:   return
   21: }
   22: 
   23: set ::enable_shared_cache [sqlite3_enable_shared_cache 1]
   24: 
   25: # Open 3 database connections. Connection "db" and "db2" share a cache.
   26: # Connection "db3" has its own cache.
   27: #
   28: do_test tkt2854-1.1 {
   29:   sqlite3 db test.db
   30:   sqlite3 db2 test.db
   31: 
   32:   # This is taken from shared.test.  The Windows VFS expands 
   33:   # ./test.db (and test.db) to be the same thing so the path
   34:   # matches and they share a cache.  By changing the case 
   35:   # for Windows platform, we get around this and get a separate
   36:   # connection.
   37:   if {$::tcl_platform(platform)=="unix"} {
   38:     sqlite3 db3 ./test.db
   39:   } else {
   40:     sqlite3 db3 TEST.DB
   41:   }
   42: 
   43:   db eval {
   44:     CREATE TABLE abc(a, b, c);
   45:   }
   46: } {}
   47: 
   48: # Check that an exclusive lock cannot be obtained if some other 
   49: # shared-cache connection has a read-lock on a table.
   50: #
   51: do_test tkt2854-1.2 {
   52:   execsql { 
   53:     BEGIN;
   54:     SELECT * FROM abc;
   55:   } db2
   56: } {}
   57: do_test tkt2854-1.3 {
   58:   catchsql { BEGIN EXCLUSIVE } db
   59: } {1 {database table is locked}}
   60: do_test tkt2854-1.4 {
   61:   execsql { SELECT * FROM abc } db3
   62: } {}
   63: do_test tkt2854-1.5 {
   64:   catchsql { INSERT INTO abc VALUES(1, 2, 3) } db3
   65: } {1 {database is locked}}
   66: do_test tkt2854-1.6 {
   67:   execsql { COMMIT } db2
   68: } {}
   69: 
   70: # Check that an exclusive lock prevents other shared-cache users from
   71: # starting a transaction.
   72: #
   73: do_test tkt2854-1.7 {
   74:   set ::DB2 [sqlite3_connection_pointer db2]
   75:   set ::STMT1 [sqlite3_prepare $DB2 "SELECT * FROM abc" -1 TAIL]
   76:   set ::STMT2 [sqlite3_prepare $DB2 "BEGIN EXCLUSIVE" -1 TAIL]
   77:   set ::STMT3 [sqlite3_prepare $DB2 "BEGIN IMMEDIATE" -1 TAIL]
   78:   set ::STMT4 [sqlite3_prepare $DB2 "BEGIN" -1 TAIL]
   79:   set ::STMT5 [sqlite3_prepare $DB2 "COMMIT" -1 TAIL]
   80:   execsql { BEGIN EXCLUSIVE } db
   81: } {}
   82: do_test tkt2854-1.8 {
   83:   catchsql { BEGIN EXCLUSIVE } db2
   84: } {1 {database schema is locked: main}}
   85: do_test tkt2854-1.9 {
   86:   catchsql { BEGIN IMMEDIATE } db2
   87: } {1 {database schema is locked: main}}
   88: do_test tkt2854-1.10 {
   89:   # This fails because the schema of main cannot be verified.
   90:   catchsql { BEGIN } db2
   91: } {1 {database schema is locked: main}}
   92: 
   93: # Check that an exclusive lock prevents other shared-cache users from
   94: # reading the database. Use stored statements so that the error occurs
   95: # at the b-tree level, not the schema level.
   96: #
   97: do_test tkt2854-1.11 {
   98:   list [sqlite3_step $::STMT1] [sqlite3_finalize $::STMT1]
   99: } {SQLITE_ERROR SQLITE_LOCKED}
  100: do_test tkt2854-1.12 {
  101:   list [sqlite3_step $::STMT2] [sqlite3_finalize $::STMT2]
  102: } {SQLITE_ERROR SQLITE_LOCKED}
  103: do_test tkt2854-1.13 {
  104:   list [sqlite3_step $::STMT3] [sqlite3_finalize $::STMT3]
  105: } {SQLITE_ERROR SQLITE_LOCKED}
  106: do_test tkt2854-1.14 {
  107:   # A regular "BEGIN" doesn't touch any databases. So it succeeds.
  108:   list [sqlite3_step $::STMT4] [sqlite3_finalize $::STMT4]
  109: } {SQLITE_DONE SQLITE_OK}
  110: do_test tkt2854-1.15 {
  111:   # As does a COMMIT.
  112:   list [sqlite3_step $::STMT5] [sqlite3_finalize $::STMT5]
  113: } {SQLITE_DONE SQLITE_OK}
  114: 
  115: # Try to read the database using connection "db3" (which does not share
  116: # a cache with "db"). The database should be locked.
  117: do_test tkt2854-1.16 {
  118:   catchsql { SELECT * FROM abc } db3
  119: } {1 {database is locked}}
  120: do_test tkt2854-1.17 {
  121:   execsql { COMMIT } db
  122: } {}
  123: do_test tkt2854-1.18 {
  124:   execsql { SELECT * FROM abc } db2
  125: } {}
  126: 
  127: # Check that if an attempt to obtain an exclusive lock fails because an
  128: # attached db cannot be locked, the internal exclusive flag used by
  129: # shared-cache users is correctly cleared.
  130: do_test tkt2854-1.19 {
  131:   forcedelete test2.db test2.db-journal
  132:   sqlite3 db4 test2.db
  133:   execsql { CREATE TABLE def(d, e, f) } db4
  134:   execsql { ATTACH 'test2.db' AS aux } db
  135: } {}
  136: do_test tkt2854-1.20 {
  137:   execsql {BEGIN IMMEDIATE} db4
  138:   catchsql {BEGIN EXCLUSIVE} db
  139: } {1 {database table is locked}}
  140: do_test tkt2854-1.21 {
  141:   execsql {SELECT * FROM abc} db2
  142: } {}
  143: 
  144: db close
  145: db2 close
  146: db3 close
  147: db4 close
  148: sqlite3_enable_shared_cache $::enable_shared_cache
  149: finish_test