# 2003 July 1

#

# 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.

#

#***********************************************************************

# This file implements regression tests for SQLite library.  The

# focus of this script is testing the ATTACH and DETACH commands

# and related functionality.

#

# $Id: attach2.test,v 1.38 2007/12/13 21:54:11 drh Exp $

#

set testdir [file dirname $argv0]

source $testdir/tester.tcl

ifcapable !attach {

  finish_test

  return

}

# Ticket #354

#

# Databases test.db and test2.db contain identical schemas.  Make

# sure we can attach test2.db from test.db.

#

do_test attach2-1.1 {

  db eval {

    CREATE TABLE t1(a,b);

    CREATE INDEX x1 ON t1(a);

  }

  file delete -force test2.db

  file delete -force test2.db-journal

  sqlite3 db2 test2.db

  db2 eval {

    CREATE TABLE t1(a,b);

    CREATE INDEX x1 ON t1(a);

  }

  catchsql {

    ATTACH 'test2.db' AS t2;

  }

} {0 {}}

# Ticket #514

#

proc db_list {db} {

  set list {}

  foreach {idx name file} [execsql {PRAGMA database_list} $db] {

    lappend list $idx $name

  }

  return $list

}

db eval {DETACH t2}

do_test attach2-2.1 {

  # lock test2.db then try to attach it.  This is no longer an error because

  # db2 just RESERVES the database.  It does not obtain a write-lock until

  # we COMMIT.

  db2 eval {BEGIN}

  db2 eval {UPDATE t1 SET a = 0 WHERE 0}

  catchsql {

    ATTACH 'test2.db' AS t2;

  }

} {0 {}}

ifcapable schema_pragmas {

do_test attach2-2.2 {

  # make sure test2.db did get attached.

  db_list db

} {0 main 2 t2}

} ;# ifcapable schema_pragmas

db2 eval {COMMIT}

do_test attach2-2.5 {

  # Make sure we can read test2.db from db

  catchsql {

    SELECT name FROM t2.sqlite_master;

  }

} {0 {t1 x1}}

do_test attach2-2.6 {

  # lock test2.db and try to read from it.  This should still work because

  # the lock is only a RESERVED lock which does not prevent reading.

  #

  db2 eval BEGIN

  db2 eval {UPDATE t1 SET a = 0 WHERE 0}

  catchsql {

    SELECT name FROM t2.sqlite_master;

  }

} {0 {t1 x1}}

do_test attach2-2.7 {

  # but we can still read from test1.db even though test2.db is locked.

  catchsql {

    SELECT name FROM main.sqlite_master;

  }

} {0 {t1 x1}}

do_test attach2-2.8 {

  # start a transaction on test.db even though test2.db is locked.

  catchsql {

    BEGIN;

    INSERT INTO t1 VALUES(8,9);

  }

} {0 {}}

do_test attach2-2.9 {

  execsql {

    SELECT * FROM t1

  }

} {8 9}

do_test attach2-2.10 {

  # now try to write to test2.db.  the write should fail

  catchsql {

    INSERT INTO t2.t1 VALUES(1,2);

  }

} {1 {database is locked}}

do_test attach2-2.11 {

  # when the write failed in the previous test, the transaction should

  # have rolled back.

  # 

  # Update for version 3: A transaction is no longer rolled back if a

  #                       database is found to be busy.

  execsql {rollback}

  db2 eval ROLLBACK

  execsql {

    SELECT * FROM t1

  }

} {}

do_test attach2-2.12 {

  catchsql {

    COMMIT

  }

} {1 {cannot commit - no transaction is active}}

# Ticket #574:  Make sure it works using the non-callback API

#

do_test attach2-3.1 {

  set DB [sqlite3_connection_pointer db]

  set rc [catch {sqlite3_prepare $DB "ATTACH 'test2.db' AS t2" -1 TAIL} VM]

  if {$rc} {lappend rc $VM}

  sqlite3_step $VM

  sqlite3_finalize $VM

  set rc

} {0}

do_test attach2-3.2 {

  set rc [catch {sqlite3_prepare $DB "DETACH t2" -1 TAIL} VM]

  if {$rc} {lappend rc $VM}

  sqlite3_step $VM

  sqlite3_finalize $VM

  set rc

} {0}

db close

for {set i 2} {$i<=15} {incr i} {

  catch {db$i close}

}

# A procedure to verify the status of locks on a database.

#

proc lock_status {testnum db expected_result} {

  # If the database was compiled with OMIT_TEMPDB set, then 

  # the lock_status list will not contain an entry for the temp

  # db. But the test code doesn't know this, so its easiest 

  # to filter it out of the $expected_result list here.

  ifcapable !tempdb {

    set expected_result [concat \

        [lrange $expected_result 0 1] \

        [lrange $expected_result 4 end] \

    ]

  }

  do_test attach2-$testnum [subst {

    $db cache flush  ;# The lock_status pragma should not be cached

    execsql {PRAGMA lock_status} $db

  }] $expected_result

}

set sqlite_os_trace 0

# Tests attach2-4.* test that read-locks work correctly with attached

# databases.

do_test attach2-4.1 {

  sqlite3 db test.db

  sqlite3 db2 test.db

  execsql {ATTACH 'test2.db' as file2}

  execsql {ATTACH 'test2.db' as file2} db2

} {}

lock_status 4.1.1 db {main unlocked temp closed file2 unlocked}

lock_status 4.1.2 db2 {main unlocked temp closed file2 unlocked}

do_test attach2-4.2 {

  # Handle 'db' read-locks test.db

  execsql {BEGIN}

  execsql {SELECT * FROM t1}

  # Lock status:

  #    db  - shared(main)

  #    db2 -

} {}

lock_status 4.2.1 db {main shared temp closed file2 unlocked}

lock_status 4.2.2 db2 {main unlocked temp closed file2 unlocked}

do_test attach2-4.3 {

  # The read lock held by db does not prevent db2 from reading test.db

  execsql {SELECT * FROM t1} db2

} {}

lock_status 4.3.1 db {main shared temp closed file2 unlocked}

lock_status 4.3.2 db2 {main unlocked temp closed file2 unlocked}

do_test attach2-4.4 {

  # db is holding a read lock on test.db, so we should not be able

  # to commit a write to test.db from db2

  catchsql {

    INSERT INTO t1 VALUES(1, 2)

  } db2 

} {1 {database is locked}}

lock_status 4.4.1 db {main shared temp closed file2 unlocked}

lock_status 4.4.2 db2 {main unlocked temp closed file2 unlocked}

# We have to make sure that the cache_size and the soft_heap_limit

# are large enough to hold the entire change in memory.  If either

# is set too small, then changes will spill to the database, forcing

# a reserved lock to promote to exclusive.  That will mess up our

# test results. 

set soft_limit [sqlite3_soft_heap_limit 0]

do_test attach2-4.5 {

  # Handle 'db2' reserves file2.

  execsql {BEGIN} db2

  execsql {INSERT INTO file2.t1 VALUES(1, 2)} db2

  # Lock status:

  #    db  - shared(main)

  #    db2 - reserved(file2)

} {}

lock_status 4.5.1 db {main shared temp closed file2 unlocked}

lock_status 4.5.2 db2 {main unlocked temp closed file2 reserved}

do_test attach2-4.6.1 {

  # Reads are allowed against a reserved database.

  catchsql {

    SELECT * FROM file2.t1;

  }

  # Lock status:

  #    db  - shared(main), shared(file2)

  #    db2 - reserved(file2)

} {0 {}}

lock_status 4.6.1.1 db {main shared temp closed file2 shared}

lock_status 4.6.1.2 db2 {main unlocked temp closed file2 reserved}

do_test attach2-4.6.2 {

  # Writes against a reserved database are not allowed.

  catchsql {

    UPDATE file2.t1 SET a=0;

  }

} {1 {database is locked}}

lock_status 4.6.2.1 db {main shared temp closed file2 shared}

lock_status 4.6.2.2 db2 {main unlocked temp closed file2 reserved}

do_test attach2-4.7 {

  # Ensure handle 'db' retains the lock on the main file after

  # failing to obtain a write-lock on file2.

  catchsql {

    INSERT INTO t1 VALUES(1, 2)

  } db2 

} {0 {}}

lock_status 4.7.1 db {main shared temp closed file2 shared}

lock_status 4.7.2 db2 {main reserved temp closed file2 reserved}

do_test attach2-4.8 {

  # We should still be able to read test.db from db2

  execsql {SELECT * FROM t1} db2

} {1 2}

lock_status 4.8.1 db {main shared temp closed file2 shared}

lock_status 4.8.2 db2 {main reserved temp closed file2 reserved}

do_test attach2-4.9 {

  # Try to upgrade the handle 'db' lock.

  catchsql {

    INSERT INTO t1 VALUES(1, 2)

  }

} {1 {database is locked}}

lock_status 4.9.1 db {main shared temp closed file2 shared}

lock_status 4.9.2 db2 {main reserved temp closed file2 reserved}

do_test attach2-4.10 {

  # We cannot commit db2 while db is holding a read-lock

  catchsql {COMMIT} db2

} {1 {database is locked}}

lock_status 4.10.1 db {main shared temp closed file2 shared}

lock_status 4.10.2 db2 {main pending temp closed file2 reserved}

set sqlite_os_trace 0

do_test attach2-4.11 {

  # db is able to commit.

  catchsql {COMMIT}

} {0 {}}

lock_status 4.11.1 db {main unlocked temp closed file2 unlocked}

lock_status 4.11.2 db2 {main pending temp closed file2 reserved}

do_test attach2-4.12 {

  # Now we can commit db2

  catchsql {COMMIT} db2

} {0 {}}

lock_status 4.12.1 db {main unlocked temp closed file2 unlocked}

lock_status 4.12.2 db2 {main unlocked temp closed file2 unlocked}

do_test attach2-4.13 {

  execsql {SELECT * FROM file2.t1}

} {1 2}

do_test attach2-4.14 {

  execsql {INSERT INTO t1 VALUES(1, 2)}

} {}

do_test attach2-4.15 {

  execsql {SELECT * FROM t1} db2

} {1 2 1 2}

db close

db2 close

file delete -force test2.db

sqlite3_soft_heap_limit $soft_limit

# These tests - attach2-5.* - check that the master journal file is deleted

# correctly when a multi-file transaction is committed or rolled back.

#

# Update: It's not actually created if a rollback occurs, so that test

# doesn't really prove too much.

foreach f [glob test.db*] {file delete -force $f}

do_test attach2-5.1 {

  sqlite3 db test.db

  execsql {

    ATTACH 'test.db2' AS aux;

  }

} {}

do_test attach2-5.2 {

  execsql {

    BEGIN;

    CREATE TABLE tbl(a, b, c);

    CREATE TABLE aux.tbl(a, b, c);

    COMMIT;

  }

} {}

do_test attach2-5.3 {

  lsort [glob test.db*]

} {test.db test.db2}

do_test attach2-5.4 {

  execsql {

    BEGIN;

    DROP TABLE aux.tbl;

    DROP TABLE tbl;

    ROLLBACK;

  }

} {}

do_test attach2-5.5 {

  lsort [glob test.db*]

} {test.db test.db2}

# Check that a database cannot be ATTACHed or DETACHed during a transaction.

do_test attach2-6.1 {

  execsql {

    BEGIN;

  }

} {}

do_test attach2-6.2 {

  catchsql {

    ATTACH 'test3.db' as aux2;

  }

} {1 {cannot ATTACH database within transaction}}

do_test attach2-6.3 {

  catchsql {

    DETACH aux;

  }

} {1 {cannot DETACH database within transaction}}

do_test attach2-6.4 {

  execsql {

    COMMIT;

    DETACH aux;

  }

} {}

db close

finish_test