XSQL Page Processor Usage

The XSQL Page Processor usage is described in the following sections:

XSQL Usage Overview

Figure 19-6 summarizes how the XSQL Page Processor is used.

The XSQL Page Processor can be accessed in three main ways:

• A -- From a call or request in XSQL Servlet. This request can be made, for example, over the web using HTTP protocol.

• B -- From the command line using the XSQL Command Line Utility

• C -- From an application using the XSQLRequest() class. For example, <xsql:query>. This can be used in any command. It is a customizable Java program.

XSQL Page Processor processes the XSQL page template.

Processing actions are stipulated in the XSQL page template and processed by the XSQL Page Processor. The following transpires:

1. XSQL Page Processor determines (parses) the processing action to be carried out

2. A stylesheet, if any, is selected and processed using the XSLT Processor

3. The result or action is returned to A, B, or C, according to where the request came from.

4. You can also customize action handlers in Java using either of the following ActionHandler classes:
   • XSQLActionHandler() class

   • XSQLActionHandlerImpl() class

Figure 19-6 XSQL Page Processor: Overview