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Two main issues make database transactions complicated for developers to work with and difficult for database vendors to implement: Concurrency control: Databases need to protect against data loss or ghost data, yet allow concurrent access to the same data Generally, developers can choose an isolation level to control the level of protection Another form of concurrency control is protecting against lost updates (For more information, see http://enwikipediaorg/wiki/Concurrency_control, http:// enwikipediaorg/wiki/Multiversion_concurrency_control, and http://enwikipediaorg/ wiki/Optimistic_concurrency_control) Synchronization between transactions: Complex applications often need a way to synchronize two or more databases or other resources so that their local transactions are guaranteed to commit or roll back in a group The technique used for this is called two-phase commit (or 2PC), distributed transactions, or global transactions We will take a sunny day approach to database transactions in this chapter and assume that you connect to only one database.

Navigate to admin/modules and deactivate contributed modules. Contributed modules can interact with your core Drupal site in complex ways, and should thus be disabled during the core update process. Each contributed module will need to be updated on its own, later. You can find instructions for how to do this in the documentation for the individual modules.

In this chapter, we covered portlet preferences for setting and retrieving individual user configuration settings for a portlet. We also discussed the preferences validator for verifying each user s preferences when they are stored. The portlet s configuration can be accessed through the methods on the GenericPortlet base class if necessary. Information about the portal server the portlet is running in can be retrieved through the PortalContext class. This information includes available window states, portlet modes, and portal properties.

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Log in to your site as administrator (user number 1). It is important that you have a browser (with cookies enabled) window open that stores the cookie for an open session with this user. Without this, you will be denied the permission to run the update script. If you need to run the update script without being able to log in as the administrator (which happens when people forget to log in before starting the update process, or otherwise skip this step), you can turn off the access check by editing the update.php script on your server. Find the following lines of code: // Enforce access checking $access_check = TRUE; Change TRUE to FALSE. Now you can run the script without logging in. If you turn off the access check in the update script, any user on the Internet can run it. Since this could have a potentially disastrous effect on your site, you must, at a minimum, edit the code to read TRUE, once again. A more secure precaution would be to remove the update.php file from your server altogether after you have finished updating your site.

SECURITY AND SINGLE Sign-On (SSO) are not unique to portlets, but when considering their implementation you must take into account some special advantages, disadvantages, and responsibilities A portlet has some security advantages over a conventional application You do not have to concern yourself with obtaining a login from the user, for example this is the responsibility of the container You do still have some responsibilities; your portlet must manage access to its resources For example, a corporate address book should probably be accessible only to employees of the company, whereas a private address book should in general be accessible by only one person A portlet may obtain information from external resources, so you also need to be aware of the options for passing security information around possibly over the network.

We won t go into the details of concurrency control and isolation levels And although many types of databases and resource types support transactions, we ll focus on transactions in relational databases, where they are most commonly used Your database vendor documentation is a good place to start if you want to learn more about how transactions work for your database..

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