If you are content with preparing them on the first invocation, you can use either ->prepare_cached or use the state keyword:

post '/invtot' => sub {
    state $st = $dbh->prepare(...);
    $st->execute(...);
};

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In reply to Re^3: How can I get a database handler with Mojolicious::Plugin::Database by Corion
in thread How can I get a database handler with Mojolicious::Plugin::Database by frazap

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