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Objects can be used to manage all of the database-speci c operations within the application, thereby making the application code itself easier to create and maintain These are the data access objects that make up the data access layer Changes to the underlying database need not affect the application code since they can be made to the classes that provide database access Changes to the business rules can be localized to the business-object layer, so that it is often possible to avoid making changes to the database structure or access layer The way that the information in the database is used and updated can be tightly controlled by the middle, business-logic layer The business objects in this layer know how to interact with the data-access layer but impose rules as to how this data can be used and changed, from the perspective of the environment they are used in For example, business rules, such as a rule that makes it impossible for a customer to withdraw money from a bank account that has a zero balance, would be coded in this layer We can make the information in a database appear as though it was a simple object model to the user-interface Data access and business logic can be given an interface that provides apparently continuous access to every element in a large database even though only a few objects may be in memory at any one time, thereby simplifying the design of the user-interface layer This layer simply handles events from the user and presents information from the lower layers Once the two bottom layers are built, we can create a range of applications based on the same database and object model This makes it possible to develop applications that are optimized for particular users within a larger organization For example, applications for data entry and recall might be important in the front of ce of a company, while others might provide for the analysis of all of the information in the database to enable executives to make strategic decisions.

int[] a = new int[3]; Object o2 = a; // ok: an array to Object // Assignments to variables of interface type: ColoredPoint cp = new ColoredPoint(); Colorable c = cp; // ok: ColoredPoint implements // Colorable

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By developing an object model to act as an access layer between the application and the database, we will effectively be making on-the- y translations from the relational data model to an object model and back again, as shown in Figure 124 In object-oriented programming terms, most of the classes in SystemData would be used in only the data-access layer of an adequate object-oriented database solution However, the DataSet class is powerful and exible enough that it has functions to offer both the data-access layer and the business layer Generally, a complex database application will bene t from the separation of data access and the implementation of business rules, and normally we would encapsulate the business rules in a business-objects layer However, for many systems the business rules may be simple enough that we can create a DataSet that will implement them, in which case there may be no need for a separate object model to build around the business rules Of course for system engineered around highly functional classes that interconnect in complex ways, a proper object model will still provide the best solution The deciding factor should be based on whether the data in database tables is simply stored and updated as a form of record-keeping system, or whether that data is to be used to reconstruct an object model that does signi cant work in its own right

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