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Re: DBI Prepared Update and NULLs

by lhoward (Vicar)
on Jul 28, 2004 at 20:09 UTC ( #378191=note: print w/ replies, xml ) Need Help??


in reply to DBI Prepared Update and NULLs

You could build your update statment dynamically, and prepare it using prepare_cached. That way its only prepared once (for each variation), and you can still take good advantage of placeholders. This is not the tightest example, and is untested, but should serve its purpose:

my %col; $col{foo}=1; $col{bar}=undef; my %vbph; my @vbval; foreach(sort keys %arg){ if(defined $arg{$_}){ $vbph{$_}='?'; push @vbval,$arg{$_}; }else{ $vbph{$_}='NULL'; } } my $sql='update baz set '. join ', ',(map{$_.'='.$vb{$_}} sort keys %arg)); my $sth=$dbh->prepare_cached($sql); $sth->execute(@vbval);


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Re^2: DBI Prepared Update and NULLs
by paulbort (Hermit) on Jul 28, 2004 at 20:58 UTC
    Thanks for the suggestion, I'll read up on prepare_cached. I know I can build the statement dynamically, that is what I've done on at least one previous occasion, but I thought that it really should work this way, so I'm trying to figure out what I'm doing wrong.

    --
    Spring: Forces, Coiled Again!

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