SQLite

** The pager is used to access a database disk file.  It implements
** atomic commit and rollback through the use of a journal file that
** is separate from the database file.  The pager also implements file
** locking to prevent two processes from writing the same database
** file simultaneously, or one process from reading the database while
** another is writing.
**
** @(#) $Id: pager.c,v 1.122 2004/06/10 05:59:25 danielk1977 Exp $
*/
#include "os.h"         /* Must be first to enable large file support */
#include "sqliteInt.h"
#include "pager.h"
#include <assert.h>
#include <string.h>

    }
  }

  assert( pPager->state==PAGER_RESERVED || pPager->state==PAGER_EXCLUSIVE );

  /* If the pager is in RESERVED state, then there must be a copy of this
  ** page in the pager cache. In this case just update the pager cache,
  ** not the database file. The page is left marked dirty in this case.
  **
  ** FIX ME: Ideally the page would only be left marked dirty when the
  ** pager is in RESERVED state if it was dirty when this statement
  ** transaction was started. 
  **
  ** If in EXCLUSIVE state, then we update the pager cache if it exists
  ** and the main file. The page is then marked not dirty.
  */
  pPg = pager_lookup(pPager, pgno);
  assert( pPager->state==PAGER_EXCLUSIVE || pPg );
  TRACE2("PLAYBACK page %d\n", pgno);

    void *pData;
    assert( pPg->nRef==0 || pPg->pgno==1 );
    pData = PGHDR_TO_DATA(pPg);
    memcpy(pData, aData, pPager->pageSize);
    if( pPager->xDestructor ){
      pPager->xDestructor(pData, pPager->pageSize);
    }
    if( pPager->state==PAGER_EXCLUSIVE ){
      pPg->dirty = 0;
      pPg->needSync = 0;
    }

    CODEC(pPager, pData, pPg->pgno, 3);
  }
  return rc;
}

/*
** Parameter zMaster is the name of a master journal file. A single journal

# 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 file is testing the DELETE FROM statement.
#
# $Id: delete.test,v 1.15 2004/06/10 05:59:25 danielk1977 Exp $

set testdir [file dirname $argv0]
source $testdir/tester.tcl

# Try to delete from a non-existant table.
#
do_test delete-1.1 {

  catchsql {
    DELETE FROM t3 WHERE 1;
  }
} {1 {attempt to write a readonly database}}
do_test delete-8.4 {
  execsql {SELECT * FROM t3} 
} {123}

# Update for v3: In v2 the DELETE statement would succeed because no
# database writes actually occur. Version 3 refuses to open a transaction
# on a read-only file, so the statement fails.
do_test delete-8.5 {
  catchsql {
    DELETE FROM t3 WHERE a<100;
  }
# v2 result: {0 {}}
} {1 {attempt to write a readonly database}}
do_test delete-8.6 {
  execsql {SELECT * FROM t3}
} {123}
integrity_check delete-8.7

finish_test

#
#***********************************************************************
# This file implements regression tests for SQLite library.  The focus of
# this file is testing the SQLite routines used for converting between the
# various suported unicode encodings (UTF-8, UTF-16, UTF-16le and
# UTF-16be).
#
# $Id: enc2.test,v 1.7 2004/06/10 05:59:25 danielk1977 Exp $

set testdir [file dirname $argv0]
source $testdir/tester.tcl

db close

# Return the UTF-8 representation of the supplied UTF-16 string $str. 

  db2 eval "CREATE TABLE abc(a, b, c);"
} {}
do_test enc2-4.3 {
  catchsql {
    ATTACH 'test2.db' as aux;
  }
} {1 {attached databases must use the same text encoding as main database}}

db2 close

finish_test

#
#***********************************************************************
# This file implements regression tests for SQLite library.
#
# This file implements tests for miscellanous features that were
# left out of other test files.
#
# $Id: misc1.test,v 1.27 2004/06/10 05:59:25 danielk1977 Exp $

set testdir [file dirname $argv0]
source $testdir/tester.tcl

# Mimic the SQLite 2 collation type NUMERIC.
db collate numeric numeric_collate
proc numeric_collate {lhs rhs} {

do_test misc1-10.10 {
  execsql {SELECT x1 FROM manycol WHERE x0=100}
} {102}

# Make sure the initialization works even if a database is opened while
# another process has the database locked.
#
# Update for v3: The BEGIN doesn't lock the database so the schema is read
# and the SELECT returns successfully.
do_test misc1-11.1 {
  execsql {BEGIN}
  execsql {UPDATE t1 SET a=0 WHERE 0}
  sqlite db2 test.db
  set rc [catch {db2 eval {SELECT count(*) FROM t1}} msg]
  lappend rc $msg
# v2 result: {1 {database is locked}}
} {0 3}
do_test misc1-11.2 {
  execsql {COMMIT}
  set rc [catch {db2 eval {SELECT count(*) FROM t1}} msg]
  db2 close
  lappend rc $msg
} {0 3}

# 2003 December 18
#
# 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 multithreading behavior
#
# $Id: thread1.test,v 1.5 2004/06/10 05:59:25 danielk1977 Exp $


set testdir [file dirname $argv0]
source $testdir/tester.tcl

# Skip this whole file if the thread testing code is not enabled
#

  thread_result B
} SQLITE_ROW
do_test thread1-2.3 {
  thread_create C test.db
  thread_compile C {INSERT INTO t2 VALUES(98,99)}
  thread_step C
  thread_result C
  thread_finalize C
  thread_result C
} SQLITE_BUSY

do_test thread1-2.4 {
  execsql {SELECT * FROM t2}
} {}

do_test thread1-2.5 {
  thread_finalize A
  thread_result A
} SQLITE_OK
do_test thread1-2.6 {
  thread_compile C {INSERT INTO t2 VALUES(98,99)}
  thread_step C
  thread_result C
  thread_finalize C
  thread_result C
} SQLITE_BUSY
do_test thread1-2.7 {
  execsql {SELECT * FROM t2}
} {}
do_test thread1-2.8 {
  thread_finalize B
  thread_result B
} SQLITE_OK
do_test thread1-2.9 {
  thread_compile C {INSERT INTO t2 VALUES(98,99)}
  thread_step C
  thread_result C
} SQLITE_DONE
do_test thread1-2.10 {
  thread_finalize C
  thread_result C
} SQLITE_OK
do_test thread1-2.11 {
  execsql {SELECT * FROM t2}
} {98 99}

thread_halt *   
finish_test