Archive for the ‘Databases’ Category

File Under: Databases, Programming

Cake and Trax for Beginners

In my last article, Building With Ajax and Rails I made a faintly disparaging joke about some new web frameworks that have been created in fond imitation of Rails. I got a lot of feedback about that joke. I’m not allowed to comment here about the pending lawsuits, but I would ask that the drive-by eggings of my house and threats to my family please cease. (They’ve been relocated to a secret Webmonkey farm anyway.)

Today we’re going to take a look at a couple of those frameworks for PHP:Trax and Cake. Both attempt to bring the quick, easy, helpful tools and easily understood, easily maintained structure of Rails to PHP — a boon to web developers who know PHP and perhaps have some keeper code in that language, but can’t resist the Rails buzz. Both Trax and Cake use the same model-view-controller pattern and Active Record ways of addressing data that Rails does. Makes one curious, no? I don’t have time to get deeply into them today, but both stress “rapid development,” so let’s see if I, your average not-too-bright web developer, can get a little app off the ground before the end of this article.

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File Under: Databases

Manage Transactions in MySQL

Overview

In this tell-all tutorial, Jay Greenspan, author of MySQL Weekend Crash Course and co-author of MySQL/PHP Database Applications, starts with a tour of the basics: He answers the age-old Q: “What’s the big deal with Transactions?”; investigates the four properties that a database must have to be considered transaction-capable; takes a closer look at locking mechanisms; and finishes up with a look at MyISAM tables, the lesser cousin of fully transaction-capable tables.

Once you have a taste of the limitations of MyISAM tables, you’ll be hungry for the real deal. In Lesson 2, Jay satiates that hunger with a thorough introduction to MySQL’s different transactional table types: BDB, Gemini, and InnoDB.

Get started: Lesson 1

File Under: Databases

Manage Transactions in MySQL – Lesson 1

(Note: This article is adapted from Jay’s new book, MySQL Weekend Crash Course look for it at a store near you. A book store! -Ed.)

MySQL has become the database of choice for many Web developers over the last few years and for good reason. It’s fast, free, easy to use, and has great community support.

But many experienced developers refused to touch MySQL because, they complained, the product didn’t implement features that were absolutely critical in an SQL server. MySQL’s most egregious omission, according to some, was its lack of transaction support. But thanks to recent developments in MySQL land, that’s no longer the case.

When it first hit the cyber-street, MySQL offered only one table type for data storage, the ISAM table now upgraded to the MyISAM type for all recent versions of MySQL. But MyISAM tables were limited. Very limited.

Then the folks from Sleepycat Software came into the picture. Sleepycat creates and sells a database storage engine which is used mostly with embedded devices. The storage engine comes with an API that allows developers to integrate Sleepycat’s data storage software into their products. And that’s just what the folks at MySQL did, they integrated the Berkeley DB (or BDB) table from Sleepycat. This was the first transactional table type included available to MySQL users.

Berkeley DB tables were followed shortly by two other transactional table types: InnoDB and Gemini. Gemini tables are adopted from another embedded storage mechanism; this one from NuSphere, a Progress Software property. InnoDB tables were designed specifically for MySQL.

But we’re getting ahead of ourselves here. Before we take a closer look at each of these different options, we need to start at square one: Why you want transaction support in the first place.

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File Under: Databases, Frameworks

Django 1.2 Alpha Offers Multiple Database Support, Improved Security Features

Django, the popular web development framework written in Python, has released the first alpha for its much-anticipated new version, Django 1.2.

Among the new features coming in Django 1.2 are support for multiple databases — a key feature for larger websites running Django — improved security features and a messaging framework that works much like Ruby on Rail’s “flash” feature.

The multiple database support will likely be the most important part of the next version of Django since it will allow for much easier application scaling. Django 1.2 makes it easy to target individual databases within your apps using some new queryset methods which make it easy to read and write to specific databases.

The security features include much-improved protection against Cross-Site Request Forgery (CSRF) attacks. For more details on how the CSRF protection works, have a look at the new CSRF documentation page.

If you’d like to test out Django 1.2, or see how your apps run on the new release, head over to the downloads page or update your Subversion checkout. Keep in mind though that this is still an alpha release and should not be used on production sites. The final release of Django 1.2 is scheduled to arrive in March 2010.

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