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    my $sql = "SELECT * from shop_items";
    my $sth   = $dbh->prepare($sql);
...
      {
             # bla bla bla
      }

   
   while(my $hash_ref = fetch_data("SELECT * FROM shop_items")) 
...
           my $sth   = $dbh->prepare($sql);
              $sth->execute;
     }