$dbh = DBI->connect("dbi:Informix:$database", $user, $pass, %attr);
 $dbh = DBI->connect("DBI:Unify:dbname[;options]" [, user [, auth [, attr]]]);
 $dbh = DBI->connect("dbi:Oracle:host=$host;sid=$sid", $user, $passwd);
 $dbh = DBI->connect("dbi:SQLite:dbname=$dbfile","","");
 $dbh = DBI->connect("DBI:drizzle:database=test;host=localhost", "joe", "joe's password", {'RaiseError' => 1});
 $dbh = DBI->connect('dbi:ODBC:DSN', 'user', 'password');
 $dbh = DBI->connect("dbi:Pg:dbname=$dbname", '', '', {AutoCommit => 0});
 $dbh = DBI->connect('DBI:RAM:','usr','pwd',{RaiseError=>1});
 $dbh = DBI->connect("DBI:Wire10:host=$host", $user, $password, {RaiseError' => 1, 'AutoCommit' => 1}
 $dbh = DBI->connect("DBI:CSV:f_dir=/home/joe/csvdb")
 $dbh = DBI->connect("dbi:JDBC:hostname=$hostname;port=$port;url=$url", $user, $password);
 $dbh = DBI->connect("dbi:Sqlflex:$database", $user, $pass, %attr);
 $dbh = DBI->connect("dbi:DB2:db_name", $username, $password);
 $dbh = DBI->connect("DBI:mysql:database=test");
 $dbh = DBI->connect('DBI:DBMaker:' . $database, $user, $pass);
 $dbh = DBI->connect('dbi:PgPP:dbname=$dbname', '', '');
 $dbh = DBI->connect('dbi:PgLite:dbname=file');
 $dbh = DBI->connect("dbi:ADO:Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\data\test.mdb", $usr, $pwd, $att )
 $dbh = DBI->connect("DBI:Ingres:dbname[;options]", user [, password], \%attr);
 $dbh = DBI->connect('DBI:Solid:TCP/IP somewhere.com 1313', $user, $pass, 'Solid');
 $dbh = DBI->connect("dbi:Google:", $KEY);