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Transactions are used to guarantee data integrity. They organize changes made to data in a database in units, which must be either completed entirely or aborted. They must also be treated in a coherent and reliable way, which is where the ACID properties (or features) come into play. The ACID properties form the minimal contract that databases must respect to ensure data integrity, as follows: Atomicity: All changes that are made between the start and the end of a transaction must either succeed or abort all together. To ensure this, a database will roll back (that is, undo) all changes that have occurred since the start of the transaction when internal errors occur or when asked to do so. Consistency: After a transaction ends is either committed or rolled back the data should be left in a consistent state, meaning no constraints or indices can be violated and field constraints like not-nullable, field length, and field type must be respected. Isolation: Transactions can run concurrently, meaning multiple transactions can insert, read, update, and delete data at the same time. Transactions should not be affected by the actions of other transactions. Because full isolation between transactions that work on the same data often involves locks, it may cause slow performance. For this reason, databases support different isolation levels that offer a trade-off between performance and the risk of being affected by the actions of other transactions. Durability: After a transaction has been committed, the changes must be stored in a durable way; for example, by saving them on the file system.

<portlet-preferences> <preferences-validator> com.portalbook.portlets.ExamplePreferencesValidator </preferences-validator> </portlet-preferences> </portlet> </portlet-app>

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You can do a lot more with WordPress. Here are some suggestions for other layouts: For a review site, you might include affiliate links on your articles or sidebars. Plug-ins are available to help you manage those links. One example is AdRotator by Angsuman Chakraborty (http://blog.taragana.com/index.php/archive/ wordpress-plugin-adrotator-rotate-your-ads-including-adsense-dynamically/). For a site that has a number of authors producing articles, you can use plug-ins that allow you to list posts just by a particular author. For example, Customizable Post Listings (http://www.coffee2code.com/archives/2004/08/27/ plugin-customizable-post-listings/) is another useful plug-in by Scott Reilly, who wrote the Customizable Comment Listings plug-in introduced in 16. It might make sense to use the excerpt on your main page instead of the whole content or the post teaser. You can also find plug-ins that will allow your readers to vote on each article, giving your authors valuable feedback about what does and doesn t work. Chris J. Davies has a great voting plug-in, available from http://www.chrisjdavis.org/2004/11/30/ new-plugin/. Numerous photo and gallery plug-ins are available, too. Examples include IImage Gallery by Martin Chlup (http://fredfred.net/skriker/index.php/iimage-gallery) c and FAlbum by Elijah Cornell (http://www.randombyte.net/blog/projects/falbum/), which uses photos stored on Flickr. A model-building or car-customizing community site could get immense value from these. If you are prepared to put a little thought into what your community wants and a little effort into giving it to them, WordPress can become the backbone of an online community. Aim to give the most to your community, and in turn, you will get the most back from it. Listen to your readers and your contributors, too. Don t jump at everything they ask, but consider their complaints, their praise, and their suggestions with equal value.

Figure 7-1 shows an example of the validation in action. Figure 7-2 shows our example portlet with some invalid input.

The idea of a database transaction is straightforward While connected to the database, you notify the database that you want to start a new transaction, execute a number of SQL statements, and then notify the database that you want to commit any changes A database connection can have only one active (or current) transaction (Other transactions may be suspended; these are called nested transactions, and they are commonly used on databases that support them) The database will automatically roll back the transaction (and all changes that were made after its start) when errors such as invalid field values, other forms of integrity violations, deadlocks, and so on occur As a database user, you can also ask the database to roll back the active transaction by issuing a rollback command.

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In this chapter, you ve seen how you can tailor WordPress to better fit the needs of your community readers. I have given you some ideas about how to anticipate your readers expectations and how to help them get a better experience from your site. These things are essential if you are to have a successful online community site and keep your visitors coming back for more. In the next chapter, I will cover some essential maintenance practices that will keep your blog running smoothly for years.

Summary

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