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Using XML to transport relational data
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form of an album. People in the recording business for some reason think the word song is inappropriate and the word composition is too long; therefore they call songs tracks instead. Sometimes bands will invite other bands to help them put together an album. More often than that, the producers do a bit of composing on their own and end up with albums containing tracks performed by several bands and authored by several authors. Despite all this confusion, these albums aren t called complications.
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We can safely say that a single Band can perform one or more Tracks and be present on one or more Albums, and that a single album may contain Tracks by one or more Bands.
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When music was first created back in the Stone Age there weren t very many musicians, let alone bands! Nowadays, regardless of the number of musicians in it, each band is given a name. Usually the names are unique, but don t bet on it. Each track is given a definite title, and as soon as it s ready to be put on an album it s also marked with a track number. Albums also have titles. And we can tell when they were released, and thanks to the devoted and sometimes psychotic fans we can know this fact down to the very second the delivery truck reached the first store.
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The information provided by Joe contains the essence of what you d need to know about discographies in order to design a solution that could support Joe and his colleagues in their work. We can identify individual business entities, the relationships that exist between them, and the attributes that describe them. And that s exactly what we need for the next step.
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The logical model
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To get a clear picture of all the elements that constitute the discography business case, see table 1, which shows individual business entities and facts about them.
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Table 1 Entities, the facts about them, and the roles those facts play in the business case Entity Discography Album Fact Contains Albums Consists of Tracks Has a Title Exists on Albums Is authored by Persons Is performed by Bands Has a Title Has a Track Number Type of fact Relationship Relationship Attribute Relationship Relationship Relationship Attribute Attribute
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Track
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Understanding before coding
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Table 1 Entities, the facts about them, and the roles those facts play in the business case (continued) Entity Person Fact Authors Tracks Is in Bands Has a First Name Has a Middle Name Has a Last Name Performs Tracks Contains Persons Has a Name Has an Established date/time Has a Disbanded date/time Type of fact Relationship Relationship Attribute Attribute Attribute Relationship Relationship Attribute Attribute Attribute
Band
A few words on logical modeling
Entities are intellectual concepts representing objects (things) and subjects (persons) present in a particular business; in fact, they exist at the center of the business. Everything in any business revolves around the entities. In our case, we ve identified individual entities in Joe s statements. The position of the entities in regard to the business is reflected in our summary of Joe s explanations through the relationships that exist between them and the attributes that describe them. Put as simply as possible, a relationship can be represented by a verb designating an action or a state involving at least two entities. Verbs designating ownership, on the other hand, represent a different kind of relationship a reference to an attribute. Relationships describe what happens and/or what is in regard to several entities, whereas attributes describe a single entity.
The entity-relationship schema is an essential part of the logical model, though not the only one, just like the data store in itself is not the only part of a data-centric solution. Business logic is the other essential part of the logical model. It defines all the data management operations needed for maintenance of the business entities. For the purposes of this chapter, we ll focus on the basic operations presented in table 2.
Table 2 Data management operations supported by our solution Operation Create Update Read Description Entity is created; the data is imported into the database. Entity is modified; the data in the database is changed. Entity is retrieved; the data is read from the database.
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