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The database used in this chapter (and in the following ones) is shown in Figure 6-3 The database consists of a CourseInfo table that contains information about courses, a CourseDates table that is associated with courses and includes specific course dates and the course length (because the length can differ with different course dates), an Attendees table with information about course attendees, and the association table CourseAttendees that maps the attendees to their courses
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Figure 6-3 Database diagram for the CourseManagement database
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The tables have a uniqueidentifier as primary key field, atimestamp to verify row changes, and an active field that enables you to set courses and attendees inactive without deleting the row entries
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Identifiers and Timestamps
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What is notable about the tables in this database is that a unique-identifier for the identifier column is used SQL Server uses a GUID with the uniqueidentifier data type A GUID, when compared to an integer as an identifier, has the disadvantage that it needs more data space; a GUID has a length of 16 bytes However, GUIDs do have a big advantage
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in distributed scenarios: Using integer values as row identifiers, the identifier must be created on the SQL Server system to get a unique value GUIDs can be created on any system; there is no need to do a separate round trip to the server to get the identifier The tables also use a Timestamp column If you add aTimestamp column to a table, this column is automatically updated if the record is changed This behavior is very useful when data is updated If two users change the same record simultaneously, only the timestamp value needs to be compared with the current value in the database to find out that the record was already updated
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Entity Classes
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For the entity classes that can be sent across different tiers and for the classes that are used to access the database, it is a good practice to use separate assemblies By doing so, it is easy to define a clear dependency of the assemblies: The entity classes will be needed in multiple tiers and so referenced from many projects, whereas the database classes just need to be referenced from some serviced component assemblies In the sample, you will find the entity classes in the assembly SamplesCourse-ManagementEntities Figure 6-4 shows the assemblies used in this chapterSamplesCourseManagementEntities contains all entity classes, such as Course and CourseDate-Collection, and the dataset classes that will be created; the assemblySamplesCourseManagementData contains all classes with direct access to the database
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Figure 6-4 Assemblies
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In Listing 6-1, you can see the class Course that acts as a data holder to encapsulate the course identifier, number, title, and timestamp [3] The class Course is marked with the attribute [Serializable] so that it can be serialized across NET remoting or DCOM boundaries In the database, the column CourseId is of type uniqueidentifier, and the column Timestamp is of type timestamp With NET, the uniqueidentifier maps to a SystemGuid type, and the timestamp maps to a byte array of eight elements The course number and title, which are nchar(10) and nvarchar(50), in the database both map to theString type in the Course class All the fields can be accessed through properties The fields courseId and timestamp only provide read-only access, because these fields may not be changed after the Course object is instantiated The values for these fields are set in the constructors You can use the default constructor to create a new course and initialize the course identifier with the NewGuid method of the Guid class The timestamp is not needed for newly initialized objects, so it is set to null If course data is read from the database, you can use the constructor to pass a course identifier and a timestamp
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