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Polynomial Evaluation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 344 A Custom C# Class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 350 A Fast Custom C# Class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 353 A CodeDOM Implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 354 A Reflection.Emit Implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . 357 Lightweight Code Generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 361

The select function returns the default filehandle name and sets the default filehandle to FILEHANDLE This is the default filehandle used by functions such as print and read when the user does not specify a FILEHANDLE If no FILEHANDLE is specified, the name of the current filehandle is returned For example, to switch buffering off for another filehandle, you could use this code:

wish to use external authentication by using appropriate syntax in the CONNECT command that you submit in your user process If you are using SQL*Plus, the syntax of the CONNECT command tells Oracle what type of authentication you wish to use: the default of data dictionary authentication, password file authentication, or operating system authentication These are the possibilities after connecting using the /NOLOG switch as described previously:

$stdfh = select DATA; $| = 1; select $stdfh;

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connect connect connect connect connect user/pwd[@connect_alias] user/pwd[@connect_alias] as sysdba user/pwd[@connect_alias] as sysoper / as sysdba / as sysoper

This works because select returns the current filehandle before setting it to the new supplied value

.

This trick is also sometimes useful when you are formatting and producing reports using the Perl reporting mechanism In both cases, however, there are now convenient ways of modifying report formats and setting the buffering of filehandles If you import the FileHandle module, then to switch off buffering, you can use

use FileHandle; autoflush(DATA);

CHAPTER 33 Interop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 365

In these examples, user is the username and pwd is the password The connect_alias is a network identifier, fully described in 4 The first example is normal, data dictionary authentication Oracle will validate the username/password combination against values stored in the data dictionary The database must be open, or the connect will fail Anyone connecting with this syntax cannot, no matter who they are, issue startup or shutdown commands The second two examples instruct Oracle to go to the external password file to validate the username/password combination The last two examples use operating system authentication; Oracle will go to the host operating system and check whether the operating system user running SQL*Plus is a member of the operating system group that owns the Oracle software, and if the user passes this test, they will be logged on as SYSDBA or SYSOPER without any need to provide a username and password A user connecting with any of the bottom four syntaxes will be able to issue startup and shutdown commands and will be able to connect no matter what state the database is in it may not even have been created yet Note that the first three examples can include a network identifier string; this is necessary if the connection is to be made across a network Naturally, this is not an option for operating system authentication, because operating system authentication relies on the user being logged on to the machine hosting the Oracle server: they must either be working on it directly or have logged in to it with telnet, secure shell, or some similar utility TIP From an operating system prompt, you can save a bit of time and typing by combining the launch of SQL*Plus and the CONNECT into one command Here are two examples: sqlplus / as sysdba sqlplus sys/oracle@orcl as sysdba Database Control will, by default, attempt to connect through a listener, but it can also use operating system authentication If the situation is that depicted in Figure 3-4, clicking the STARTUP button will require operating system logon credentials to be entered in order to proceed If the listener is running, Database Control will present the login window shown in Figure 3-6 The Connect As list of values lets you choose whether to make a normal connection or a SYSDBA connection.

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