Re^3: fetchrow

Thanks, but you lost me on:

 $sth->bind_columns( \( @row{ @{$sth->{NAME_lc} } } ));
[download]

Can you unpack that for me? It thought binding is related to placeholders. What exactly is bind_columns doing and what is the gain? Appreciate it, TIA!

—Brad
"The important work of moving the world forward does not wait to be done by perfect men." George Eliot

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Re^4: fetchrow_array by kutsu (Priest) on May 27, 2005 at 16:36 UTC
bind_columns is binding columns ;), seriously though: NAME_lc are the lower case column names from the database, region and sales in this case, and these are in an array ref which is used as the keys for %row (using a hash slice). The reason it uses bind_columns is that it processes the columns one by one (allowing you to have a normal hash not a hash of an array). So it's doing something like this: `$sth->bind_columns( \( @row{ @{$sth->{NAME_lc} } } )); # NAME_lc = lower case column name # so it's equal to \@row{\@region} (and \@row{\@sales}) # binds \$row{region} much as it would \$region while($sth->fetch) { # sets $row{region} with region's data # does same with sales print "$row{region}, $row{sales}\n"; # since this is rebinded each time %row is overwritten }` [download] I hope this helps "Cogito cogito ergo cogito sum - I think that I think, therefore I think that I am." Ambrose Bierce	[reply] [d/l]
Re^4: fetchrow_array by injunjoel (Priest) on May 27, 2005 at 18:26 UTC
Greetings all, Here is my crack at it. we know that `$sth->{NAME_lc};` [download] returns the column names selected and lower-cased. with that we then utilized those names as a hash slice from the hash %row with the `@row{ @{$sth->{NAME_lc}}};` [download] part. So up to this point we have a hash %row with keys equal to the lower-cased column names returned from the query. So next we reference the slice for the bind_columns call, which we accomplish by doing an \ on the entire list; the same as saying `$sth->bind_columns(\($var1, $var2, $var3));` [download] which would create references for each var in the list. Nice way of doing it and probably one I will adopt in the future since I mostly use either fetchrow_hashref or just bind explicit vars. Does that make sense? -InjunJoel "I do not feel obliged to believe that the same God who endowed us with sense, reason and intellect has intended us to forego their use." -Galileo	[reply] [d/l] [select]