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Figure 6-1. Viewing index.html in a web browser The first thing you are going to do is create your JSON object. You do this between the opening and closing <script> tag. The object definition is exactly as was illustrated in Listing 6-5, except that you are also assigning the object to a JavaScript variable name, which is in this instance car (Listing 6-7). Listing 6-7. index.html Adding the JSON Object

Now that you have created the JPA entities to be utilized within the sample, it is time to look back at the database tier and determine whether some adjustments are required. If you recall from the earlier Creating JPA Entities Upon the Underlying Database Tables section, since you did not define a Detail entity upon the underlying details table, you might want to implement the task of moving the data from the shoppingCarts table to the details table at the database tier. This task comes up each time a new record is inserted into the orders table. As mentioned, you might implement the AFTER INSERT trigger on the orders table to handle this task. The following two sections discuss how to implement this trigger in MySQL and Oracle.

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One of the vastly misunderstood features of JavaScript is its use of closures. With a closure, a child function has access to the environment of the parent function, even after the parent function has completed execution. In Figure 3-1, functions A and B have access to the variables and functions declared within the window object. Likewise, if functions C and D are declared within function B, they have access to all the variables and functions declared within the window object and also those within function B. Any functions declared within function C have access to all variables and functions all the way up the tree.

To implement the AFTER INSERT trigger on the orders table in MySQL, you first have to connect to the database as the usrsample user via the MySQL command-line tool and then issue the CREATE TRIGGER statement shown in Listing 8-6. Listing 8-6. Creating the AFTER INSERT Trigger on the orders Table in MySQL delimiter // use dbsample CREATE TRIGGER afterinsertorder AFTER INSERT ON orders FOR EACH ROW BEGIN INSERT INTO details (ordno, book_id, units, unit_price) SELECT NEW.pono, book_id, units, unit_price FROM shoppingCarts WHERE cart_id=NEW.cust_id; DELETE FROM shoppingCarts WHERE cart_id=NEW.cust_id; END; // delimiter ; As you can see, the trigger, when fired, issues two statements that perform two operations: inserting the data into the details table and then deleting this same data from shoppingCarts. So, what this trigger actually does is move a user s shopping cart contents from the shoppingCarts table to the details table when the user places an order.

would you write their name as John NULL Smith Of course not. You would simply leave out the middle name altogether. The same principle applies to a document-oriented database. Naturally, a schema-free architecture has some disadvantages, such as a lack of defined structure and unnecessary replication of data across documents. Of course, in cases where these criteria are of the utmost importance, CouchDB is probably not the database for you. In fact, the developers openly state that they do not intend for CouchDB to be a direct replacement for a relational SQL-based database. Instead, they see it as an alternative in scenarios where a document-oriented architecture is a viable solution. In applications such as wikis, document management systems, discussion forums, blogs, support management systems, and so forth, documents are the way forward. For years now, web developers have retrofitted their application model to fit around a relational database. Thanks to CouchDB, this may no longer be necessary.

Using the RPM packages is the recommended way to install MySQL on Linux. The following steps assume your Linux supports RPMs: 1. Perform the following commands to install the server and client RPMs picked up from the MySQL Downloads page: # rpm -i MySQL-server-VERSION.i386.rpm # rpm -i MySQL-client-VERSION.i386.rpm By default, the server RPM adds the entries to /etc/init.d/, which are required to start the mysqld server automatically at boot time. 2. After the installation, it is highly recommended you assign the password to the anonymous accounts: # mysql -u root mysql> SET PASSWORD FOR ''@'localhost' = PASSWORD('new_pswd'); mysql> SET PASSWORD FOR ''@'your_hostname' = PASSWORD('new_pswd');

Figure 3-1. How closures create a hierarchy of variable and function access The most common example of closures involves declaring event handlers: function attachBehavior(){ var element = document.getElementById('main'); element.onclick = function(){ element.innerHTML = 'Surprise!'; }; }

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