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If the DBMS is relational and were implemented after the mid 1980s, it is typically best to use the DBMS functionality to enforce value and referential integrity. Sybase, Oracle, SQL Server, DB2, and Informix to mention the most popular DBMSs have had these abilities for many years. These DBMSs include declarative value and referential integrity constraint features, integrated with the Data Description Language (DDL), and they provide built-in declarative triggers to handle cascading actions required for referential integrity, such as deleting all item rows in a canceled order. Implementing these in the enterprise bean layer would duplicate logic, making maintenance difficult. Any change to the database constraints would require making the change to enterprise beans and to the database. The architectural benefits and capabilities maintaining data integrity constraints in the database layer include the following:

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#import <UIKit/UIKit.h> @class SwitchViewController; @interface EinSwitch01AppDelegate : NSObject <UIApplicationDelegate> { UIWindow *window; } @property (nonatomic, retain) IBOutlet UIWindow *window; @end

If for some reason multiple applications are responsible for maintaining database integrity, every application creates an opportunity for bugs that would violate that integrity. Furthermore, other applications that may want to access the database are relieved of the duty of maintaining integrity constraints. They still must, of course, deal with error conditions that result if they violate those constraints.

We can obtain a second equation which highlights the importance of d = 2 by operating on * with = . This gives { + (d 2) }( ) = 0 The in nitesimal parameter can represent four different types of transformations: translations, scale transformations, rotations, and special conformal transformations. A translation takes the form

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If the constraints are maintained only in the database, the database is the one place where data can be considered consistent by definition. If data inconsistencies exist, either the integrity constraints are incorrect or the design has flaws. Simple value and integrity constraints, such as primary keys, simple foreign keys, uniqueness, value range checking, and so on, are reasonably portable. Database vendors that offer database constraints features have invested a great deal of time and money in ensuring that those features operate correctly and efficiently.

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The drawbacks of using the DBMS built-in database integrity constraints mechanisms and the EJB can include the following:

We now know that when we code the implementation file that corresponds with this header file, to delegate work to the SwitchViewController, it will have the ability to do so. Cool! Next, we move to the IBOutlet for the UIWindow portion of the code: the user interface window and its associated pointer window. We need to create an IBOutlet for all of the SwitchViewController bells and whistles. Therefore, after the UIWindow *window section, add SwitchViewController *switchViewController into the code. Once this is done, we can add an @ property directive and take care of the IBOutlet:

Enterprise beans generally need reasonable data to perform properly. Therefore, most well-designed enterprise beans do a reasonably good job of checking data values and existence constraints. Database integrity violation errors usually indicate a bug or a problem with the design. Nevertheless, the logic enforcing value and referential integrity is necessarily duplicated. Changing the integrity rules in the database will usually also entail changes to the code, and keeping the two synchronized can be a problem. While simple value and referential integrity constraints are fairly portable, databases differ in coverage and syntax for more involved mechanisms such as composite foreign keys, database triggers, and procedural triggers. Procedural triggers in particular are portability concerns, because, when offered, they are often written in the database vendor s product-specific proprietary language. For example, Sybase Transact SQL is very different from the Oracle PL/SQL procedure language. Because database constraint and trigger configuration are performed with the database vendor s tools, such constraints are maintained outside of the JEE server framework. Because the data model constraints are specified not in the deployment descriptor but in the persistence layer, such constraints are not part of a JEE server deployment. They must therefore be managed separately, complicating deployment and maintenance and providing another possible avenue for system flaws.

where a is a constant. A scale transformation is one of the form:

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