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Now, let s look at how you can create the updateBooks stored procedure in Oracle. Listing 5-7 shows the statement you should issue. Listing 5-7. Creating the updateBooks Stored Procedure in Oracle, Which Will Be Called from Within the neworder Trigger Defined in Listing 5-8 CREATE OR REPLACE PROCEDURE updateBooks (book_id IN VARCHAR2, units IN NUMBER) AS BEGIN UPDATE books SET quantity = quantity units WHERE isbn = book_id; END; / As Listing 5-8 shows, in the case of Oracle you don t have to explicitly drop the original version of the neworder trigger before creating the updated version of it. Instead, you use the CREATE TRIGGER statement with the OR REPLACE clause. Listing 5-8. Updating the neworder BEFORE INSERT Trigger in Oracle Originally Created As Shown in Listing 5-2 CREATE OR REPLACE TRIGGER neworder BEFORE INSERT ON orders FOR EACH ROW BEGIN updateBooks (:NEW.book_id, :NEW.units); END; / With that done, you can test the updated application. It is important to note that all the changes made in the database tier in this section do not require you to change anything in the other application layers. So, you can issue the appclient command in the way you did in the Moving Business Logic Into Triggers section. Don t forget to increase the ID of the order being inserted to avoid a unique key constraint violation: appclient -client processing-todata.jar 6 1 1 1430209631 Just like in the preceding example, the previous should result in inserting a new record into the orders table and reducing the value of the quantity field in the corresponding record in the books table by 1.

In that last bit of code, you see the this keyword, which enables you to refer to the current object. In this case, the <a> element is the current object. As you get into more advanced event handling and object-oriented programming techniques, the this keyword will play a prominent role.

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administration interface (which would later be named Futon) This version of CouchDB was the first version that could actually be used as a proper database, and it quickly drew the attention of IBM, which backed the project, allowing Damien Katz (who previously worked for IBM) to work full-time on developing CouchDB Soon after IBM got involved, CouchDB s license was changed to use the Apache License rather than the restrictive and cumbersome GNU General Public License (GPL) In February 2008, it was announced that CouchDB would include support for Map/Reduce CouchDB views would be defined using a Map function and an optional Reduce function The Map function would take an input document and emit key/value pairs The Reduce function then takes each of these pairs and performs further calculation.

As you no doubt have realized, from the user s standpoint, there is no difference between the applications discussed in this chapter and the application discussed in the Transaction Considerations section in the preceding chapter. So, you may be wondering what benefits moving the business logic into the database tier actually brings. As mentioned earlier, implementing business logic inside the underlying database allows you to simplify the persistence and business logic tiers of your application. Moreover, moving data processing to the data lets you centralize control over business logic. You won t need to

duplicate the same code in the other applications working with the same data and performing the same operations on it. For example, if you re going to need to develop another application dealing with the books table, which will automate the process of returning unsold book copies to the publisher, you could rely on the functionality provided by the updateBooks stored procedure and the newquantity trigger, rather than implementing this functionality in the business logic tier of that new application. You might argue that some business logic implemented in the underlying database might be otherwise implemented within a reusable EJB module or modules, which might be easily utilized within newly created applications dealing with the same underlying data. But what if you want to have some applications implemented using different technologies, not EJB 3 It is fairly obvious that you would not be able to reuse that EJB module or modules if your new application was implemented, say, in PHP. Figure 5-7 gives a conceptual depiction of how business logic of an application can be divided between the underlying database and Java EE application server or PHP/web server. It illustrates that the logic implemented inside the database can be reused by many applications built upon that database.

I previously mentioned the three pillars of separation: HTML from CSS from JavaScript. In the case of inline event handlers, you re not much better off than with style attributes. However, you can centralize all the behavior in external files and apply them to each document as required. You do this by attaching event handlers to the objects via JavaScript. For example, if you want to run some code after the page loads, you can do this: window.onload = function() { foo(); bar(); }

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