use strict;
use warnings;

# database specific definitions for a 'mysql' database

my $have_transactions;


#
#   This function generates a list of tables associated to a
#   given DSN.
#
sub ListTables(@) {
    my($dbh) = shift;
    my(@tables);

    @tables = $dbh->func('_ListTables');
    if ($dbh->errstr) {
	die "Cannot create table list: " . $dbh->errstr;
    }
    @tables;
}


#
#   This function is called by DBD::pNET; given a hostname and a
#   dsn without hostname, return a dsn for connecting to dsn at
#   host.
sub HostDsn ($$) {
    my($hostname, $dsn) = @_;
    "$dsn:$hostname";
}

#
#   Return TRUE, if database supports transactions
#
sub have_transactions () {
    my ($dbh) = @_;
    return 1 unless $dbh;
    if (!defined($have_transactions)) {
        $have_transactions = "";
        my $sth = $dbh->prepare("SHOW VARIABLES");
        $sth->execute();
        while (my $row = $sth->fetchrow_hashref()) {
            if ($row->{'Variable_name'} eq 'have_bdb'  &&
                $row->{'Value'} eq 'YES') {
                $have_transactions = "bdb";
                last;
            }
            if ($row->{'Variable_name'} eq 'have_innodb'  &&
                $row->{'Value'} eq 'YES') {
                $have_transactions = "innodb";
                last;
            }
            if ($row->{'Variable_name'} eq 'have_gemini'  &&
                $row->{'Value'} eq 'YES') {
                $have_transactions = "gemini";
                last;
            }
        }
    }
    return $have_transactions;
}


1;