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Up until now we have shown how to authenticate the user and how to verify the user is authorized to perform certain actions. This is a substantial part of working with authentication in a web application, but we still haven t covered a very important part of this process. In all but the simplest cases, after you have authenticated the user, you will want to work with the authenticated user s data. In Catalyst, once authentication has completed successfully, you will have a user object available to you as $c->user(), which represents the authenticated user. The information available through $c->user varies depending on the source of the user information. In our case, using the DBIx::Class user store, all the information available in the users table will be

Listing 5-22. Using the GREATEST and LEAST Functions select greatest(12*6,148/2,73) , least (12*6,148/2,73) from dual; GREATEST(12*6,148/2,73) LEAST(12*6,148/2,73) ----------------------- -------------------74 72

Relevant menu items on the View menu are explained below Several menu items have submenu selections, and those options are listed below the parent menu item Some menu items have keyboard shortcuts, which are displayed next the menu item in square brackets Anti-alias: This menu item is enabled for monochrome images The term anti-alias refers to altering the grayscale hue of pixels along borders and edges in an image Instead of a stark black and white pixel between lines and shapes, shades of gray are used to blend transitions more smoothly The effect is to make borders and edges appear less jagged This menu item has three submenu selections: None: No anti-aliasing is used Fast (4 shades of gray): Uses shades of gray Borders and edges are made more smooth than if the None option is selected Partial (16 shades of gray): Uses 16 shades of gray.

If you don t do this, then things slow down pretty quickly with multiple concurrent requests The built-in server is a blocking server that is, it won t process a second request until it s finished processing the first request Therefore, with multiple concurrent requests a queue forms, and each request will be processed only when the previous ones in the queue have finished When you have logic in your application, that can take a little while to process (eg, where you have computationally expensive logic to process), and this can cause things to slow down dramatically The built-in server also has a -k option for keepalive The keepalive option means that if the browser sends the header Connection: Keep-Alive with its request, then the server will not disconnect immediately, but will maintain the connection with the client.

The NVL function is useful if you want to prevent certain expressions, or expression components, from evaluating to a null value, as you can see in Listing 5-23. Listing 5-23. Using the NVL Function select , from where ename, msal, comm 12*msal+nvl(comm,0) as yearsal employees ename like '%T%';

Borders and edges are made more smooth than if the Fast (4 shades of gray) option is selected Image Type: Opticon can optimize scaling if it s informed of the type of image being displayed This menu item has three submenu selections: Textual [Ctrl+T]: Used when an image consists primarily of text Line Image [Ctrl+L]: Used for line art Photograph [Ctrl+H]: Used if an image is a monochrome photograph Invert Color [I]: Produces a negative effect on monochrome images: blacks are rendered as whites; whites are rendered as blacks Zoom in 50% [+]: Magnifies an image by +50 percent, effectively zooming in Depending on the current magnification of an image when this option is selected, some portions of an image might exceed the boundaries of the Opticon window and not be visible You can resize an image at any time to fit entirely within the Opticon window.

ENAME MSAL COMM YEARSAL -------- -------- -------- -------SMITH 800 9600 MARTIN 1250 1400 16400 SCOTT 3000 36000 TURNER 1500 0 18000