ASP.NET Web PDF Document Viewer/Editor Control Library

Once you log in to the iSQL*Plus interface successfully, you ll be in the iSQL*Plus Workspace, and here you can enter SQL commands for execution. The Workspace, shown in Figure 12-1, consists of the Workspace, History, and Load Script screens. This is what you can do in the Workspace screen: Enter, execute, and cancel SQL scripts Load scripts from a directory on the server Load and save a script to a file View, save, and print your output Log out Access the Help screen Go to the History and Preferences screens Here s what you can do in the History and Preferences screens: History: You can save and reuse recently executed SQL scripts through the History screen. Only scripts that you entered in the current session are available. Preferences: The Preferences screen lets you change your password, set system variables, and set the interface options (size of the screen and so forth) for your iSQL*Plus sessions. You can divide the configurable items in the Preferences screen into three main groups: interface configuration, system configuration, and changing a password.

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The interface configuration settings includes settings that affect your iSQL*Plus interface. You can configure items like these: History size: The number of scripts displayed in the script history. Input area size: The size of the script input area. Output location: Where you want the output to be displayed you can select the screen, a text file, or a printer as the location for the output text. Output page setup: You can decide whether output is displayed on a single page or over multiple pages.

System configuration consists of three main areas: Script formatting: You can format the script output and determine what optional information it will contain. You can also specify whether your output is displayed in preformatted text form or as an HTML table. Script execution: You can configure script parsing and executing settings, such as array size, checking of SQL syntax, and whether to automatically commit changes. Database administration: You can set the source of the archive logs needed during database recovery (the equivalent SQL command for this is SET LOGSOURCE), and you can choose whether you want automatic recovery (using the default filenames for archived redo logs) or not (the equivalent SQL command for this is SET AUTORECOVERY).

managed heap. Even though memory allocation on the managed heap is a very fast operation, this can be an overhead. Due to the many objects created, the GC has to do much more than necessary. Furthermore, for every concatenation, the result of the previous concatenation, as well as the string to add, must be copied to the new string s memory. If there are many strings to concatenate, you should use the helper type StringBuilder from the namespace System::Text. using System::Text::StringBuilder; StringBuilder^ sb = gcnew StringBuilder(1024); sb->Append("Rows: \n"); for (int i = 0; i < 100; ++i) sb->AppendFormat("Row {0}\n", i); System::String^ strResult = sb->ToString(); Another special aspect of managed strings is the fact that they can be pooled. The CLR provides a pool for managed strings. The string pool can be helpful to save memory if the same string literal is used several times in your code, and to provide a certain optimization of comparisons against string literals. If you create your assembly with C++/CLI, all managed string literals used inside your assembly end up in the string pool. Some other .NET languages, including the C# version that comes with Visual Studio 2005, do not pool their string literals. (See the MSDN documentation for System::Runtime::CompilerServics:: CompilationRelaxiationAttribute for more details.)

You can display the output of your work in either preformatted text form or in an HTML table. You may find that it s easier to copy the output if it s in the text format. Here s how to specify the preformatted text display: SET MARKUP HTML PREFORMAT ON If you d rather view the text in the HTML table format, specify the following: SET MARKUP HTML PREFORMAT OFF

You can log in to an iSQL*Plus session in two different ways. If you are logging in as a normal user, all you have to do is submit your database username/password combination. If you are logging in as a DBA with the SYSDBA or SYSOPER privilege, you have to go through an extra layer of authentication in addition to database authentication, you must add your name and password to the Application Server authentication file. This mandatory SYSOPER and SYSDBA role authentication by the iSQL*Plus Application Server middle layer actually means that there are two sets of usernames and passwords that you need to use to gain entry into the Oracle database as a DBA when you are using the iSQL*Plus interface.

while read line do # Process the $line variable in some form. if [ "`echo $line | awk '{print $3}'`" = "somevalue" ] then all="$all $line" fi done < somefile