September 1999
Intermediate to advanced
256 pages
7h 5m
English
Content preview from Oracle Web Applications: PL/SQL Developer's Intro
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Creating Dynamic Resources
Now that we have a basic understanding of how the WRB uses cartridges to execute different kinds of resources, let’s look at the PL/SQL cartridge in more detail.
The PL/SQL cartridge allows us to use PL/SQL procedures to create dynamic resources. As with the CGI interface, these resources are called with a URL. Unlike CGI, a PL/SQL cartridge maintains a persistent connection to a database, so it executes almost instantaneously. In addition to producing lightning-fast performance, the cartridge resolves the two thorny problems with the CGI interface: connection management and parameter passing.
Following our discussion of the advantage of this cartridge, we’ll bring up a few security caveats to keep in mind when using cartridges.
Connection Management
WRBX processes connect to one particular account within a database upon initialization. The configuration for the connection is divided into two parts: the Database Access Descriptor and the PL/SQL agent.
Database Access Descriptor
A Database Access Descriptor (DAD) creates a unique alias for a database that is to be accessed over the Web. The DAD contains all the information needed to connect to the database, including the database name, its ORACLE_HOME directory, and its SQL*Net V2 service name. Figure 4.5 shows OAS’s DAD configuration page.
Figure 4-5. Configuration screen for a DAD
PL/SQL agent
The PL/SQL agent
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