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

To write to a file, you must open the file in the write (w) or append (a) mode. The append (a) mode just adds to the file, and the write (w) mode overwrites the file if it already exists. If the file doesn t already exist in the UTL_FILE directory, the UTL_FILE utility will first create the file and then write to it. Note that you don t have to create the file manually the FOPEN function takes care of that for you. When you want to write a line to the file, you can use the PUT procedure. After the package writes a line, you can ask it to go to a new line by using the NEW_LINE procedure. Better yet, you can just use the PUT_LINE procedure, which is like a combination of the PUT and NEW_LINE procedures, to write to the text file.

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ystem administrators have to manage the computing resources available to their users. One resource consists of the directory queues for e-mail and print servers. These directories contain the files waiting to be processed by the server. The number of files in these directories varies depending on the volume of work on the server. There are times when no one is using the service and the queue empties out. There are also times when the server is heavily loaded and the queue will be full. Usually, though, the number of files will stay within stipulated limits. Of course, from time to time you will have problems with a queue filling up faster than the server can process the requests. This might be due to a bubble of extremely heavy load or because of some type of problem that prevents the server from processing the requests. You will want to monitor the queue directories so you can take the proper measures when a problem arises. The script presented in this chapter is a simple monitor that counts the files in the specified directories. The script gives you the necessary core functionality; you will, however, want to modify the directory locations and notification methods for your own site and needs.

When you finish reading from or writing to the file, you need to use the FCLOSE procedure to close the operating system file. If you have more than one file open, you may use the FCLOSE_ALL procedure to close all the open files at once.

Whenever you use the UTL_FILE package in a PL/SQL procedure or block, make sure you have an exception block at the end to account for all the possible errors that may occur while you re using the package. For example, your directory location may be wrong, or a no data found error may be raised within the procedure. You may have a read or write error due to a number of reasons. The UTL_FILE package comes with a large number of predefined exceptions, and I recommend using all the exceptions at the end of your procedure or code block to facilitate debugging. If you use RAISE_APPLICATION_ERROR to assign an error number and a message with the exceptions, you ll have an easier time debugging the code.

This compilation model is fundamentally different from /clr and /clr:pure because it supports neither the C++ type system nor source code compatibility If you try to compile the DependentDLLs sample application that I used previously to describe the difference between /clr and /clr:pure with /clr:safe, you will harvest some thousand compiler errors one for every pointer type and every C++ class, struct, enum, and union used in the header windowsh and all headers indirectly included by windowsh To compile this application, you can use managed types only Notice that the following code uses the managed wrapper Console::Beep from the FCL instead of the native function Beep from kernel32dll: // SafeCodecpp // build with "CL /clr:safe SafeCodecpp" using namespace System; int main() { Console::Beep(440, 100); } Sacrificing the native type system gives you one benefit in return You can execute your code with restricted CAS permissions.

The following anonymous PL/SQL code uses the UTL_FILE package to write password-related information using the DBA_USERS and the DBA_PROFILES dictionary views. Your goal is to produce an operating system file listing user names, their maximum login attempts, their password lifetime, and their password lock time. Listing 24-19 shows the code block.