Re: Question of SQL and an array

[jZed]

You are confused about the difference between an array and an arrayref and a "$" and an "@". "@row->[0]" doesn't mean anything, that's not how either arrays or arrayrefs are referenced. You need something like this, but this is only a guess since you don't really tell us what you want to do.

my $m_dbh = DBI->connect("DBI:mysql:...);
my $a_dbh = DBI->connect('dbi:AnyData(RaiseError=>1):');
$a_dbh->func( 'cars', 'CSV', 'testperl.csv', 'ad_catalog');
my $pats = $m_dbh->selectcol_arrayref("
    SELECT PAT FROM patentes
");
my $pats_str = join ',',@$pats;
my $a_sth = $a_dbh->prepare("
    SELECT * FROM cars WHERE PAT IN ($pats_str)
");
$a_sth->execute();
while(my $row = $a_sth->fetch){
    print "@$row\n";
}

[ArmandoG]

Hi you almost got it is very simple but since english is my
second or third language is getting hard, look you almost
got it, I want to do this, from a MYSQL table call
PATENTES get ONLY the field PAT, to do this I have
to do this :

  my $dbh = DBI->connect("DBI:mysql:database=proyecto;host=localhost",
                         "root", "xyz123",
                         {'RaiseError' => 1});
   my $sth = $dbh->prepare("SELECT PAT FROM patentes");

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

so far so good, at this point I have @row->[0] that has all the data from the field PAT of the table PATENTES.

Now with these array I want to use it in another file this is a CSV datafile and it has a PAT field too, so I want to extract the data from this file using PAT and if posible to create a new CSV file with the name of the field PAT using INTO OUTFILE, I try to do this but did not work:

my $dbh = DBI->connect("DBI:mysql:database=proyecto;host=localhost",
                         "root", "xyz123",
                         {'RaiseError' => 1});
   my $sth = $dbh->prepare("SELECT PAT FROM patentes");

  $sth->execute();
   while ((my @row) = $sth->fetchrow_array()) {

my $dbh = DBI->connect('dbi:AnyData(RaiseError=>1):');
  $dbh->func( 'cars', 'CSV', 'testperl.csv', 'ad_catalog');
  my $sth = $dbh->prepare("SELECT * INTO OUTFILE @row->[0].csv FROM ca
+rs WHERE pat = @row->[0]);
  $sth->execute();

}

Hope this is more exact

[jZed]

It's not your English that is confusing me, it's your perl :-). You are getting your $dbh's and $sth's mixed up -- you need to name them differently, so for example $m_dbh is your MySQL dbh and $a_dbh is your AnyData dbh. But I also still don't understand what your goal is. You want to get everything in the CSV file that has a PAT equal to a PAT in the MySQL database, right? Then what do you want to do with that data?