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Re^2: nested dbi queries question

by philosophia (Sexton)
on Feb 01, 2005 at 23:28 UTC ( #427095=note: print w/replies, xml ) Need Help??


in reply to Re: nested dbi queries question
in thread nested dbi queries question

i tried the code below, no errors, but it's also not moving rows from table sp to table sp_err

# begin fix loop

$sql = "SELECT * FROM sp WHERE NOT EXISTS (SELECT * FROM SP,SUPPLIER WHERE SUPPLIER.snum = SP.snum)";
$sth2 = $dbh->prepare($sql);
$sth2->execute or die "Error: $DBI::errstr\n";

$sth2->bind_col(1,\$spnum);
$sth2->bind_col(2,\$snum);
$sth2->bind_col(3,\$pnum);
$sth2->bind_col(4,\$qty);

while($sth->fetch){
$sql = "INSERT INTO sp_err SELECT * FROM sp WHERE spnum = $spnum && snum = $snum";
$sth = $dbh->prepare($sql);
$sth->execute or die "Error: $DBI::errstr\n";
print "deleted row";

}

Replies are listed 'Best First'.
Re^3: nested dbi queries question
by trammell (Priest) on Feb 01, 2005 at 23:40 UTC
    Well you should have errors--you're fetching from $sth before you execute it, then clobbering it inside your while loop.
      here's my current code. same result still...

      # begin fix loop

      $sql = "SELECT * FROM sp WHERE NOT EXISTS (SELECT * FROM SP,SUPPLIER WHERE SUPPLIER.snum = SP.snum)";
      $sth = $dbh->prepare($sql);
      $sth->execute or die "Error: $DBI::errstr\n";

      $sth->bind_col(1,\$spnum);
      $sth->bind_col(2,\$snum);
      $sth->bind_col(3,\$pnum);
      $sth->bind_col(4,\$qty);

      while($sth->fetch){

      $sql2 = "INSERT INTO sp_err SELECT * FROM sp WHERE spnum = $spnum && snum = $snum";
      $sth2 = $dbh->prepare($sql2);
      $sth2->execute or die "Error: $DBI::errstr\n";
      print "deleted row";

      }
Re^3: nested dbi queries question
by philosophia (Sexton) on Feb 01, 2005 at 23:36 UTC
    i think i've narrows the problem to this line
    $sql = "SELECT * FROM sp WHERE NOT EXISTS (SELECT * FROM SP,SUPPLIER WHERE SUPPLIER.snum = SP.snum)";
    it's not finding any results. it's supposed to find all rows in table sp where sp.snum does not exist in table supplier

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