# 2001 September 15

#

# 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 page cache subsystem.

#

# $Id: pager3.test,v 1.3 2005/03/29 03:11:00 danielk1977 Exp $

set testdir [file dirname $argv0]

source $testdir/tester.tcl

# This test makes sure the database file is truncated back to the correct

# length on a rollback.

#

# After some preliminary setup, a transaction is start at NOTE (1).

# The create table on the following line allocates an additional page

# at the end of the database file.  But that page is not written because

# the database still has a RESERVED lock, not an EXCLUSIVE lock.  The

# new page is held in memory and the size of the file is unchanged.

# The insert at NOTE (2) begins adding additional pages.  Then it hits

# a constraint error and aborts.  The abort causes sqlite3OsTruncate()

# to be called to restore the file to the same length as it was after

# the create table.  But the create table results had not yet been

# written so the file is actually lengthened by this truncate.  Finally,

# the rollback at NOTE (3) is called to undo all the changes since the

# begin.  This rollback should truncate the database again.

# 

# This test was added because the second truncate at NOTE (3) was not

# occurring on early versions of SQLite 3.0.

#

ifcapable tempdb {

  do_test pager3-1.1 {

    execsql {

      create table t1(a unique, b);

      insert into t1 values(1, 'abcdefghijklmnopqrstuvwxyz');

      insert into t1 values(2, 'abcdefghijklmnopqrstuvwxyz');

      update t1 set b=b||a||b;

      update t1 set b=b||a||b;

      update t1 set b=b||a||b;

      update t1 set b=b||a||b;

      update t1 set b=b||a||b;

      update t1 set b=b||a||b;

      create temp table t2 as select * from t1;

      begin;                  ------- NOTE (1)

      create table t3(x);

    }

    catchsql {

      insert into t1 select 4-a, b from t2;  ----- NOTE (2)

    }

    execsql {

      rollback;  ------- NOTE (3)

    }

    db close

    sqlite3 db test.db

    set r ok

    ifcapable {integrityck} {

      set r [execsql {

        pragma integrity_check;

      }]

    }

    set r

  } ok

}

finish_test