[sqlite] WAL files and PERL question

[John Carey]

Hello, 

 

I am trying to write a simple perl program
<http://www.perlmonks.org/?node_id=1053595>  (perl version 5.16.3). I am
accessing a SQLite db using WAL. It took me a while but I learned that my
connection is 
only looking at the DB file and not the WAL file. As a result, my queries
are not returning the full data set.
the SQLite firefox <http://www.perlmonks.org/?node_id=1053595>  addon shows
10 invoices in the invoice table. the following program is returning only
8...

use DBD::SQLite; 
use DBI;
use Tkx;
use File::Copy;
use PDF::API2;
use constant mm => 25.4 / 72;
use constant in => 1 / 72;
use constant pt => 1;

# Prompt user for database <http://www.perlmonks.org/?node_id=1053595>  file
location

$dbfile = Tkx::tk___getOpenFile(-initialdir=>'C:/events_p', -title=>'Please
select your current events database file (event.sqlite)');
$dbfile =~ s/\//\\/g;

# Initialiatize path variables
# parse out the db filename and path
$DbFilename=substr($dbfile,length($dbfile)-12,12);
$FolderPath=substr($dbfile,0,length($dbfile)-13);
$OriginalImages_Path=$FolderPath.\\OriginalImages
<file:///\\%5C%5COriginalImages> ;
$Internal_Path=$FolderPath.\\_internal <file:///\\%5C%5C_internal> ;
$Carts_Path=$FolderPath.\\Carts <file:///\\%5C%5CCarts> ;
$Orders_Path=$FolderPath.\\Orders <file:///\\%5C%5COrders> ;
$favorites="c:\favorites";
$Invoices_Folder="C:\\events_p_invoices";

# Error and exit if incorrect DB filename was selected
if ($DbFilename ne 'event.sqlite')
{ 
    print "\n**** ERROR ****, Invalid Database Filename Selected\n"; 
    print "      You MUST select the filename called  event.sqlite\n"; 
    sleep(10);
    exit;
}

# Connect to the Database <http://www.perlmonks.org/?node_id=1053595> 
my $dbh2 = DBI->connect("dbi:SQLite:$dbfile", "", "",{RaiseError => 1,
AutoCommit => 1}) or die $DBI::errstr;; 
$dbh2->do('PRAGMA journal_mode=WAL');
my $sth = $dbh2->prepare("SELECT count(*) fromInvoice");

$sth->execute();
  while (@data = $sth->fetchrow_array())
 {
      print "count=$data[0]\n";
 }

exit;

If I go into the firefox add on and run a checkpoint , the 2 new invoices
get flushed from the WL to the db file and then my program sees them
what am I doing wrong where my script is only looking at the db file and not
the WAL file?

thanks!

John

 

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