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CHAPTER 2 FRAMEWORK DE SIGN
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The IDataErrorInfo Interface
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Earlier I discussed the need for objects to implement business rules and expose information about broken rules to the UI. The System.ComponentModel.IDataErrorInfo interface is designed to allow data binding to request information about broken validation rules from a data source. We will already have the tools needed to easily implement IDataErrorInfo, given that the object framework already helps the objects manage a list of all currently broken validation rules. This interface defines two methods. The first allows data binding to request a text description of errors at the object level, while the second provides a text description of errors at the property level. By implementing this interface, the objects will automatically support the feedback mechanisms built into the Windows Forms DataGridView and ErrorProvider controls.
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Object Persistence and Object-Relational Mapping
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One of the biggest challenges facing a business developer building an object-oriented system is that a good object model is almost never the same as a good relational data model. Because most data is stored in relational databases using a relational model, we re faced with the significant problem of translating that data into an object model for processing and then changing it back to a relational model later on to persist the data from the objects back into the data store.
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Note The framework in this book doesn t require a relational model, but since that is the most common data storage technology, I focus on it quite a bit. You should remember that the concepts and code shown in this chapter can be used against XML files, object databases, or almost any other data store you are likely to use.
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Relational vs. Object Modeling
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Before going any further, let s make sure we re in agreement that object models aren t the same as relational models. Relational models are primarily concerned with the efficient storage of data, so that replication is minimized. Relational modeling is governed by the rules of normalization, and almost all databases are designed to meet at least the third normal form. In this form, it s quite likely that the data for any given business concept or entity is split between multiple tables in the database in order to avoid any duplication of data. Object models, on the other hand, are primarily concerned with modeling behavior, not data. It s not the data that defines the object but the role the object plays within your business domain. Every object should have one clear responsibility and a limited number of behaviors focused on fulfilling that responsibility.
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Tip I recommend the book Object Thinking by David West (DV-Microsoft Professional, 2004) for some good insight into behavioral object modeling and design. Though my ideas differ somewhat from those in Object Thinking, I use many of the concepts and language from that book in my own object-oriented design work and in this book.
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For instance, a CustomerEdit object may be responsible for adding and editing customer data. A CustomerInfo object in the same application may be responsible for providing read-only access to customer data. Both objects will use the same data from the same database and table, but they provide different behaviors. Similarly, an InvoiceEdit object may be responsible for adding and editing invoice data. But invoices include some customer data. A na ve solution is to have the InvoiceEdit object make use of the aforementioned CustomerEdit object. That CustomerEdit object should only be used in the case
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C HAPTE R 2 FRA MEWORK DES IGN
where the application is adding or editing customer data something that isn t occurring while working with invoices. Instead, the InvoiceEdit object should directly interact with the customer data it needs to do its job. Through these two examples, it should be clear that sometimes multiple objects will use the same relational data. In other cases, a single object will use relational data from different data entities. In the end, the same customer data is being used by three different objects. The point, though, is that each one of these objects has a clearly defined responsibility that defines the object s behavior. Data is merely a resource the object needs to implement that behavior.
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