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The Stored Procedures
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As with many other client-server systems, the business logic resides in the stored procedures of the database The order entry screens store the information that makes up an order in the various tables of the application The system has a large number of stored procedures, mainly related to the logistics of the Just-In-Time inventory, delivery schedules, purchasing, handling the accounting books (general ledger, accounts payable, receivables, invoicing), and the maintenance of the various tables However, we will only use the following stored procedures as the basis for the project in this book: Q pizzaPrice - searches for the price of a pizza in the corresponding table If the order is from Canada or Mexico, it does the currency conversion and rounding calculations described earlier It also handles the price of the special of the day orderPrice - calculates the price of the order as it is at that moment deliverOrder - prepares the order message and passes it on to the fax subsystem, and updates the inventory
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For practical purposes, we will also add a fourth stored procedure, assignOutlet, which will play the role of a rather primitive replacement of the functionality of the hypothetical FastAddress application
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Setting the Scene - Pizzas to Go
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The Database Schema
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As we will only focus on these four stored procedures, only the tables that they manipulate need be handled The next figure shows these tables and their relationships:
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Setting up the Database
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The database used for the examples of this book is Oracle 8i (version 815) You can download the Oracle Database Enterprise Edition from their web site at http://wwworaclecom You will have to register in the Oracle Technology Network (it is free} and have a little patience for downloading the software, as it is over 250MB The database can be installed on the computer with the applications or on another computer in the network In this case, the Oracle client libraries must be installed on the computer with the applications, in order to access the remote database,
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We will use the BEA 's type-2JDBC driver for Oracle, We bLogic jDriver for Oracle Other JDBC drivers can be used, like the Oracle thin driver, a type-4 driver
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On the Wrox web site (http://wwwwroxcom) you can find the zip file with all the code in this book (wlsbook_code zip) Unzip this file under the c : \ directory and it will create the directory c: \wlsbook, containing all the necessary files in their folders You will need also the BEA WebLogic Server version 510 or higher and a BEA WebLogic Server certified JDK, like the SUN JDK version 130 You can download them from http://wwwbeacom and http://javasuncom respectively BEA also provides service packs for WebLogic Server that resolves issues of the product The examples in the book were run with version 510 and service pack 5 For the rest of the book, we will assume that the products and applications are installed in the default directories, as shown in the following table: Software BEA WebLogic Server SUN JDK Oracle database Application Version 510 sp 5 130-C 81500
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Installation directory
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c :\weblogic c :\ j d k l 3 c:\ o r a c l e \ o r a 8 1 c :\wlsbook
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Usually, these directories are configurable If you select another installation directory, keep it in mind when reading the instructions and programs After all the products are installed, you will have to set up the database following these simple instructions: Q cmd Q Set up the scripts setEnv cmd and setDB Run the scripts
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The c : \wlsbook\setEnv cmd script sets up the environment variables for a command line session At the beginning of this script there is a section where you can set up the installation directory for the products These directories must be changed if the installation was not made with the default values
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