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I mentioned XML as being one of the core tenets of Ajax, and you might wonder how XML fits into all this. As Jesse James Garrett originally describes, Ajax incorporates XML as a data interchange format, XSLT as a manipulation format, and XHTML as a presentation format. While XML was originally described as a major component of Ajax, that strict description has loosened and now describes the process of communicating with the server via JavaScript using the XMLHttpRequest object and the many technologies that are involved in implementing a site or an application using Ajax (such as HTML and JSON). Ajax enables communication with the server without requiring a page refresh. But what does that mean to you It gives you the ability to perform asynchronous actions (hence the first A in Ajax). You can perform form validation before the form has even been submitted. For example, have you ever tried signing up for a service only to find that the user ID was already taken You d hit the Back button, try a different name (and retype your password because it is never retained), and resubmit. This cycle would annoyingly repeat itself until you found an unused name. With Ajax, you can check the user ID while the user is completing the rest of the form. If the name is taken, an error message displays to the user, who can fix it before submitting the form. With this new power, developers have been pulling out all the stops to build some dazzling applications. Alas, many are more glitz than guts; more pizzazz than power. While you might find yourself wanting to add the latest trick, it will always be important to think about usability and accessibility in all you put together. This topic will be discussed throughout the book.

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Note In this particular example, the decision to move the SELECT statement issued against the books

Summary

table does not seem to make a lot of sense. After all, you issue a query against a single table, retrieving a single number. However, this approach would make sense if, for example, you needed to calculate that number based on the data received from a set of different database objects. Furthermore, hiding SQL queries within stored procedures improves security since the application does not interact with the underlying tables directly.

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The next trick is to use a timer to test for the existence of any elements before using them and then using window.onload as a fallback. Stuart Colville (http://muffinresearch. co.uk) did just that with his Element Ready script, which checks to see whether the element exists. If it doesn t, it checks again in a few milliseconds. It continues to check until the element is found or until the window.onload event fires. A personal variation on his script is shown here: var ElementReady={ polled:[], /* store polled elements */ timer:null, /* store timer */ timerStarted: false, ceasePoll:function() { clearTimeout(this.timer); this.timerStarted = false; }, startPoll:function() { if(!this.timerStarted) this.timer = setTimeout(function(){ElementReady.check(false)},100); }, check:function(clean) { for(var i=0;i<this.polled.length;i++) { if(document.getElementById(this.polled[i]['element'])) { this.polled[i]['callback'](); this.polled.splice(i--,1); }else if(clean){ this.polled.splice(i--,1); } } if(this.polled.length == 0) this.ceasePoll(); }, cleanUp:function() { this.check(true); this.ceasePoll(); }, chkDomId:function(elId,callback) { var el = document.getElementById(elId); if (el) { callback(); }else{

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That concludes Part 1 of the book In 1, you discovered what CouchDB is and how it differs from traditional relational database management systems You learned about CouchDB s history and all about the building blocks of the database server In 2, you learned how to install the CouchDB server on the Linux operating system You first learned how to install CouchDB from source code on Ubuntu Linux, installing dependencies using the apt-get package utility You then used the yum package manager to install CouchDB 090 on Fedora Linux 11 Finally, you undertook the brave task of downloading and building CouchDB and its dependencies Erlang, ICU, and Spidermonkey from source code In 3, you learned how to install CouchDB on a Mac OS X machine You downloaded and installed Apple s developer tools package, Xcode.

To create such a function in MySQL, you might issue the CREATE FUNCTION statement as shown in Listing 5-10. Listing 5-10. Creating the copiesInStock Stored Function in MySQL delimiter // CREATE FUNCTION copiesInStock (book_id VARCHAR(20)) RETURNS INT BEGIN DECLARE qnty INT; SELECT quantity INTO qnty FROM books WHERE isbn = book_id; RETURN qnty; END; // delimiter ; To create the copiesInStock stored function in Oracle, you might issue the CREATE FUNCTION statement shown in Listing 5-11. Listing 5-11. Creating the copiesInStock Stored Function in Oracle CREATE FUNCTION copiesInStock (book_id VARCHAR2) RETURN NUMBER AS qnty NUMBER; BEGIN SELECT quantity INTO qnty FROM books WHERE isbn = book_id; RETURN qnty; END; / For a quick test of the copiesInStock function, you might issue the following SELECT statement in both MySQL and Oracle: SELECT copiesInStock('1430209631') as InStock FROM DUAL;

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