Create a real object and then you call your methods by the method name stored in the DB;

# This is a code fragment and assumes a DBI statement handle $sth
# that retrieves the appropriate records
my $fs = FunctionSet->new();

while ( my $row = $sth->fetchrow_hashref )  {
    my $method_name = $row{method_name};
    my $arg         = $row{arg};
    $fs->$method_name($arg);
}
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