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There are thousands of web hosts offering a number of hosting plans. Some hosts even offer to install Drupal for you. I do not recommend using automated installation scripts because they will frequently install an outdated version of Drupal. The best way to install Drupal is by using the packages available at the Drupal web site, as discussed later in this chapter. Configuring MySQL, PHP, and your web server (Apache or IIS) can be a challenging process, especially for those without server administration experience. My recommendation is to find a host that provides an 800 number with 24/7 support and will configure it for you. These are some questions you should ask your host to ensure Drupal will run on their servers:

Figure 7-7. Select a new color in the Color Editor. Now press F5 to compile and run the application and notice when it runs the Background changes to the color you just specified in the Properties panel for the Behavior. You have just used your very first Behavior! There are other Behaviors that are cool too. Close the application, and let s see the MouseDragElementBehavior Behavior in action.

You ve probably noticed that the Bid entity doesn t have a method to save itself into the database. The JPA EntityManager performs this bit of heavy lifting by reading ORM configuration and providing entity persistence services through an API-based interface.

The EntityManager knows how to store a POJO entity into the database as a relational record, read relational data from a database, and turn it into an entity; update entity data stored in the database; and delete data mapped to an entity instance from the database. As you ll see in chapters 9 and 10, the EntityManager has methods corresponding to each of these CRUD (Create, Read, Update, Delete) operations, in addition to support for the robust Java Persistence Query Language (JPQL).

to apply the MouseDragElementBehavior Behavior to. Do that now so that you have what I have in Figure 7-8.

As promised earlier, listing 2.8 shows how the PlaceBid EJB uses EntityManager API to persist the Bid entity.

Can you edit the php.ini configuration file and add extensions/libraries If not, does the server meet minimum the PHP requirements listed in Table 2-1 Can you set the MySQL system variable max_allowed_packet to at least 16MB Many contributed modules require this. Do database accounts support the following rights: select, create, insert, alter, update, delete, drop, index, lock, and create temporary tables Core modules and some contributed modules require these rights. Does the web server (Apache or IIS) provide a mod_rewrite extension or URL rewrite module You will need this for clean URLs.

For the very same reason, the strategy also limits the ability to enforce data integrity constraints. For example, if you want to enforce a column

in Figure 7-9.

constraint that BID_FREQUENCY cannot be NULL for a Bidder, you would not be able to enforce the constraint since the same column will contain Seller records for which the value may be NULL. Typically, such constraints are enforced through alternative mechanisms such as database triggers for the single-table strategy.

The second inheritance strategy avoids the pitfalls we ve described and fully utilizes database relationships.

There are also a few things you will need to consider if you are hosting more than one site:

Timeline panel so that your Objects and Timeline panel looks like Figure 7-10.

The joined-tables inheritance strategy uses one-to-one relationships to model OO inheritance. In effect, the joined-tables strategy involves creating separate tables for each entity in the OO hierarchy and relating direct descendants in the hierarchy with one-to-one relationships. For a better grasp, let s see how the data in figure 8.10 might look using this strategy. In the joined-tables strategy, the parent of the hierarchy contains only columns common to its children. In our example, the USERS table contains columns common to all ActionBazaar user types (such as USERNAME). The child table in the hierarchy contains columns specific to the entity subtype. Here, both the BIDDERS and SELLERS tables contain columns specific to the Bidder and Seller entities, respectively (for example, the SELLERS table contains the CREDIT_WORTH column). The parent-child OO hierarchy chain is implemented using one-to-one relationships. For example, the USERS and SELLERS tables are related through the USER_ID foreign key in the SELLERS table pointing to the primary key of the USERS table. A similar relationship exists between the BIDDERS and USERS tables. The discriminator column in the USERS table is still used, primarily as a way of easily differentiating