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Re: best method to update mysql records over the web

by frankus (Priest)
on Jun 28, 2002 at 08:24 UTC ( #177961=note: print w/replies, xml ) Need Help??

in reply to best method to update mysql records over the web

When updating data on a database from a form, general practice is to take the data from form and pass it to a update SQL statement.
use CGI; use DBI; sub update_mytable($$$$$) { my ($db,$id,$name,$rank,$serialno)=@_; # Use late binding, good practice for some DBs; doesn't hurt others my $sql = "update mytable set name = ?, rank = ?, serialno =? where +id= ?"; my $sth; # Wrap db activities in eval so non-fatal eval($sth = $db->prepare($sql) ); eval( $sth->execute($name,$rank,$serialno,$id); ) unless $@; # return $@?$@:1; } my $q = new CGI; my $d = new DBI(....); my $id = $q->param('id'); ... my $serialno = $q->param('serialno'); update_mystable($d,$id,$name,$rank,$serialno);

Is that what you meant to ask? Try looking at Merlyn's page or Ovid's page for hints on CGI tips.


Brother Frankus.


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[Eily]: you could tie a variable into not having the same value each time, if you like to make people who try to debug your code facepalm
[Corion]: perl -wle 'package o; use overload q("") => sub {warn "str"; ""}, bool => sub{warn "bool"; 1}; package main; my $o={}; bless $o => o; print "Yay" if ($o && !length($o))'
[Corion]: But people writing such code should document the objects they construct and why it makes sense for an object to be invisible as string while being true in a boolean context
[hippo]: That's equal parts clever and horrendous.
[Eily]: the overload version wouldn't return true with "$x" && !length $x though, I guess
[hippo]: The more I look at this code, the more $x is a plain old scalar and the more this condition will never be true. I'm calling it a bug at this point.
[hippo]: Thanks for your input which has soothed my sanity (a little)
[Corion]: Eily: Sure - if you force both things into stringy things, then you break that magic. But that would also mean that you changed the expression, as now $x = 0.00 will be true instead of false as it were before
[Corion]: Ah no, at least in my feeble experiments that doesn't change the meaning
[Corion]: We sell sanity in small packages ;)

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