.NET/ASP.NET/C#/VB.NET PDF Document SDK

Figure 9-9. Calling managed virtual functions from native code In this sample, both main and the virtual functions of SampleClass are compiled to managed code. Since native callers could also call the virtual functions, the vtable entries in the SampleClass vtable are function pointers to unmanaged-to-managed thunks. When managed code calls such a virtual function, it first picks the corresponding virtual function pointer from the vtable. To call the virtual function via the function pointer, a managed-to-unmanaged thunk is necessary because the vtable entry refers to the unmanaged-to-managed thunk, which is an unmanaged function.

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HP-UX, and the IBM AIX versions. The basic commands don t vary much between the UNIX variants, and the different flavors mainly distinguish themselves on the basis of the utilities that come packaged with them. Contrary to what newcomers to the field might imagine, UNIX is an easy operating system to learn and use. What might put off many developers and others who were weaned on the graphical Windows framework are the terse and cryptic commands commonly associated with the UNIX operating system. Take heart, though, in the knowledge that the essential commands are limited in number, and you can become proficient in a very short time. Sun Microsystems (Sun), Hewlett-Packard (HP), and IBM sell the leading UNIX servers the machines that run each firm s variation of the Berkeley UNIX system V. IBM is also a big UNIX supplier with its AIX server. Sun and HP currently run the vast majority of UNIX-based Oracle installations.

Developed by Linus Torvalds, Linux is constantly under development because it is released under an open source license and is freely available for download from the Internet. Many users prefer to use Linux because more programs and drivers are available, it s free (or close to free, as the commercial versions are fairly cheap), and bug fixes are released very quickly. A version of Oracle Database 10g for Linux is available for download on the OTN web site. Oracle has certified and supports Red Hat Enterprise Linux AS and ES (either the 3.0 or the 2.1 version), SUSE LINUX Enterprise Server, and Asianux 1.0. Oracle will also continue to provide customer support for UnitedLinux 1.0 throughout its life cycle for existing Oracle products.

When this function is called, it is assumed that the ASCII characters depicting the tree structure have already been set for the current process being displayed. The function s responsibility is to then determine what the branch structure will be for the next process to be displayed so the branches will line up appropriately. Now we recursively call the function with the current child process ID and the new prefix string.

explained in the Connectionless SQL*Plus Session with /NOLOG section of this chapter), all you ll need is a valid username/password combination to start a SQL*Plus session and connect to a database.

Before you can invoke SQL*Plus, you must first set your Oracle environment correctly. You must set the ORACLE_SID, ORACLE_HOME, and LD_LIBRARY_PATH environment variables. In addition, sometimes you may have to set the NLS_LANG and ORA_NLS33 environment variables as well. If you don t have the correct environment variables set, you ll see an error. For example, not setting the ORACLE_HOME variable correctly before starting SQL*Plus will lead to the following error: $ sqlplus Error 6 initializing SQL*Plus Message file sp1<lang>.msb not found SP2-0750: You may need to set ORACLE_HOME to your Oracle software directory If you get the preceding error, simply set the value of the ORACLE_HOME environment variable, as shown here: $ export ORACLE_HOME= /u01/app/oracle/product/10.2.0/db_1

From either a client machine or the database host server, you can access SQL*Plus from the command-line prompt by typing sqlplus without providing either the username or the password. SQL*Plus will then prompt you for your username and password. If you provide the username with the command (for example, sqlplus salapati), SQL*Plus will prompt you for the password. As a DBA, you should log in with one of your administrative accounts.

On UNIX servers, be sure to type in lowercase letters. On Windows, the interface is not case sensitive. Other than this minor detail, the SQL*Plus command-line interface works the same way on Windows and all variants of the UNIX and Linux platforms.

print_tree $child "$temp"