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@Id @Column(name = "LAST_NAME") private String lastName; @Version private Long version; @EmbeddedId private Address homeAddress; public Person() { } /* get/set methods */ }

In this example, both the id and lastName fields are now marked @Id. We have added an @IdClass annotation that identifies PersonPK as the composite primary key class, shown in Listing 4-25.

Before you install Drupal, you need three basic components in place: the server, the web server, and the database. If you are hosting your site with a commercial hosting company, you can skip to the installing Drupal section, as everything you need is already installed. Depending on the operating system on your computer, you may already have a few of the required components already installed (for example, OSX comes with Apache and PHP already installed). However, getting all of the components to work together may be more of a challenge than most people want to undertake. Fortunately, a group of very talented people at apachefriends.org created an all-inone software package called XAMPP (XAMPP stands for Apache, MySQL, PHP, and Python) that is very simple for even the least technical person to install and configure. There is an XAMPP distribution for Windows, Macintosh (OSX) , Linux, and Solaris. The components included in XAMPP that are critical for Drupal are: Apache: The web server software package that handles requests for content residing on your server and returning the results of that request back to the person who made it. MySQL: The relational database where Drupal stores all of its content. PHP & PEAR: The programming language used by the developers who create and maintain Drupal. phpMyAdmin: An invaluable tool for creating and managing databases, tables, and data stored in your MySQL database.

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Since you changed the overriding methods in the SqlDataProvider class, you must also change the abstract methods in the DataProvider class. The new code for the Abstract Methods region in the DataProvider.vb file is as follows:

public class PersonPK implements Serializable { private Long id; private String lastName; public PersonPK(); /* get/set methods */ }

#Region "Abstract methods" Public MustOverride Function GetTimePunchs(ByVal ModuleId As Integer, _ ByVal PunchUserID As Integer) _ As IDataReader Public MustOverride Function GetTimePunch(ByVal ModuleId As Integer, _ ByVal ItemId As Integer) _ As IDataReader Public MustOverride Sub AddTimePunch(ByVal ModuleId As Integer, _ ByVal PunchType As Integer, _ ByVal PunchUserID As Integer) Public MustOverride Sub UpdateTimePunch(ByVal ModuleId As Integer, _ ByVal ItemId As Integer, _ ByVal PunchUser As Integer, _ ByVal PunchType As Integer, _ ByVal PunchDate As DateTime) Public MustOverride Sub DeleteTimePunch(ByVal ModuleId As Integer, _ ByVal ItemId As Integer) #End Region

This composite key class requires no special annotations. It is primarily used when looking up a Person instance through its primary key, using the EntityManager.find() method.

There are detailed instructions for installing XAMPP on each of the supported platforms on the apachefriends.org.

The abstract methods of the DataProvider.vb file now match the overridden implementations in the SqlDataProvider.vb file. You are now finished with the DAL, and you can check that off your list. You can now move up the data chain to the BLL.

When defining a relationship in which the inverse entity uses a composite primary key, the owning entity must map its relationship field to columns of the corresponding type. This requires use of the @JoinColumns annotation (or equivalent XML metadata). If these columns happen to be nested in the owning entity s primary key, or if they are otherwise NOT NULL constrained, then the relationship must be bound at the time the

EntityManager.persist() operation is called to persist this entity into the persistence context, or at least by the time EntityManager.flush() is called to issue the database INSERT call. In the following example, the PersonPK composite primary key class contains two fields id and addressId that are mandatory (NOT NULL) since they are part of the primary key. Since the addressId and the relationship field homeAddress both map to the same ADDRESS_ID column, and only one of these fields may be insertable and updatable,

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