Thanks, maybe I understand it. By using prepare_cached method, I can do without a hash like %cached_statments, and I can get a benefit from all modules I'm making.
Regards, Hirosi Taguti [EMAIL PROTECTED] > -----Original Message----- > From: Steven Lembark [mailto:[EMAIL PROTECTED] > Sent: Monday, August 29, 2005 2:08 AM > To: Hirosi Taguti; dbi-users@perl.org > Subject: RE: Memoizing non-place-holding sql statements to > place-holding > > > > I've read DBI doc but I cann't understand prepare_cached. > > Any difference between prepare and prepare_cached? > > prepare_cached is useful if you are going to re-use > a statement handle. It stores the statement handle > in a hash keyed by the sql statement itself. This > saves re-preparing the statement if it is reused: > > For example: > > my $sth = $dbh->prepare_cached( 'select foo from bar' ); > > Calls code like: > > my $dbh = shfit; > my $sql = shift; > > ... > > $cached_statments{ $sql } ||= $dbh->prepare( $sql ); > > This only does the prepare once (when the ||= finds a > false value in %prepared_statements). > > These are useful when you are going to re-run the same > query any number of times from different parts of the > code. > > > > -- > Steven Lembark 85-09 90th Street > Workhorse Computing Woodhaven, NY 11421 > [EMAIL PROTECTED] 1 888 359 3508 >
