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APPENDIX B
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Database normalization
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In the relational world, it is extremely important that the same conceptual data not be replicated throughout the database. The importance of avoiding redundancy stems from two facts. First, most databases hold a huge amount of data. For example, it is easy to think that storing department name and location in a table with employee information is no big deal. The problem is that if a thousand employees work in the same department, the department information would be duplicated across a thousand employee table rows! If a department location changes, you would have to accurately update each of the records for the thousand employees who work for the department. Second, this redundancy can easily lead to inconsistency. Both of these problems can be solved by storing a foreign key to the department table (say department ID) in the employee table instead. Relational theory has formalized the process of checking the database design for redundancy. This process is called database normalization. IBM researchers initially proposed three different levels of normalization: first, second, and third normal form, each consisting of a well-defined, incrementally strict set of rules to check for database fitness. Later, more levels were introduced: BCNF (Boyce-Codd Normal Form), fourth, and fifth normal form. Relational theory recognizes the fact that normalization can lead to trading off speed for space efficiency. Most DBAs go through the process of selective denormalization when faced with tricky performance issues.
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Coverage of SQL syntax is well beyond the scope of this appendix. However, at least a basic grasp of SQL is essential to understand chapters 8, 9, and 10. If you don t already have a working knowledge of SQL, we highly recommend that you investigate it on your own.
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APPENDIX C
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In this appendix, we list all the EJB 3 annotations we talked about throughout the book. This appendix is designed to be a quick reference you can use while developing your enterprise application. See the individual chapters for the full details of each annotation. The annotations are organized by topic, roughly following the same sequence as the chapters.
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C.1 Session and message-driven beans
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The following are all the annotations that are used in session and messagedriven beans.
C.1.1 Session beans
These annotations are used for stateless and stateful session beans. javax.ejb.Stateless Marks a POJO as a stateless session bean.
@Target(TYPE) @Retention(RUNTIME) public @interface Stateless { String name() default ""; String mappedName() default ""; String description() default ""; }
Vendor-specific bean name
javax.ejb.Stateful Marks a POJO as a stateful session bean.
@Target(TYPE) @Retention(RUNTIME) public @interface Stateful { String name() default ""; String mappedName() default ""; String description() default ""; }
Vendor-specific bean name
javax.ejb.Remove Denotes a business method as the remove method of a stateful session bean.
@Target(METHOD) @Retention(RUNTIME) public @interface Remove { boolean retainIfException() default false; }
Session and message-driven beans
The @Remove annotation has one element: retainIfException. If it is set to true and an exception is thrown from designated method, the bean will not be removed. javax.ejb.Remote Marks a POJI as a session bean remote business interface.
@Target(TYPE) @Retention(RUNTIME) public @interface Remote { Class[] value() default {}; }
The @Remote annotation can be applied on both on a bean class or on a business interface. The class element is used to specify the name of the interface when @Remote is applied on the bean class. javax.ejb.Local Marks a POJI as a session bean local business interface.
@Target(TYPE) @Retention(RUNTIME) public @interface Local { Class[] value() default {}; }
The @Local annotation can be applied on a bean class or on a business interface. The class element is used to specify the name of the interface when @Local is applied on the bean class. javax.ejb.RemoteHome and javax.ejb.LocalHome The RemoteHome and LocalHome annotations are used for backward compatibility with EJB 2 session bean clients. You can use these annotations with EJB 3 session beans that provide an EJB 2 client view.
@Target(TYPE) @Retention(RUNTIME) public @interface RemoteHome { Class value();
Home interface
@Target(TYPE) @Retention(RUNTIME) public @interface LocalHome { Class value();
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