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Constraints are the concept that is closest to business rules in a basic relational database schema. In effect, constraints maintain data integrity by enforcing rules on how data may be modified. Since most database vendors try to differentiate their products by offering unique constraint features, coming up with a list of constraints to discuss is not easy. We have chosen to cover the bare minimum set necessary to understand EJB 3 persistence features, namely primary/foreign keys, uniqueness constraints, NULL constraints, and sequence columns.

Other code elements, such as code blocks like for loops and if statements, define the structure of a program With the exception of static code blocks in AspectJ, these elements are considered too fine grained to be used when defining aspects Even though these elements define useful treatments for method bodies, it is assumed that the crosscutting nature of a functionality can be captured with higher-level elements, such as the ones mentioned in the previous list Aspect-oriented-compiler designers often use the term joinpoint shadow Like a hook for run-time weavers, a joinpoint shadow is a place in the program where an aspect can potentially apply Hence, the joinpoints as the points where the aspects actually apply are a subset of the set of joinpoint shadows Depending on the information needed by the aspects, several pieces of data can be constructed during run time when a joinpoint is reached.

lookup of the entity bean. In order for remote clients to access the entity data, they need access through a wrapper session bean. The session bean can then manage user session data, transactions, and more. The session facade pattern is widely accepted by the enterprise development community, and you should use it for all of your entity bean access.

Just as a set of fields or properties uniquely identifies an entity, a set of columns uniquely identifies a given database record. The column or set of columns identifying a distinct record is called a primary key. For example, the CATEGORY_ID column is the primary key for the CATEGORIES table. When you identify a column or set of columns as the primary key, you essentially ask the database to enforce uniqueness. If the primary key consists of more than one column, it is called a compound or composite key. For example, instead of CATEGORY_ID, the combination of CATEGORY_NAME and CREATION_DATE could be the primary key for the CATEGORIES table. Primary keys that consist of business data are called natural keys. A classic example is using some business data such as a Social Security number (represented by an SSN column) as the primary key for an EMPLOYEES table. CATEGORY_ID or EMPLOYEE_ID, on the other hand, are examples of surrogate keys. Essentially, surrogate keys are columns created explicitly to function as primary keys. Surrogate keys are popular and we highly recommend using them, especially as opposed to compound keys. Other than naming, primary key and uniqueness constraints do exactly the same thing, and the constraint is usually applied to columns that can function as alternate natural keys.

The interaction of primary and foreign keys is what makes relational databases shine. Foreign keys are essentially primary key values of one table stored in another table. Foreign keys are the database equivalents of object references, and

You want to query your persistent system for information about entity data without creating entity beans or using JDBC.

Figure B.2 The CATEGORY_ID foreign key in the ITEMS table points to the primary key of the CATEGORIES table.

A joinpoint object can even be provided by the language Finally, all programs, even the simplest ones, contain many different joinpoints The task of the aspect programmer is to select the joinpoints that are useful for implementing a given aspect This selection is performed with the notion of a pointcut, which is presented in the next section..

signify relationships between tables. As shown in figure B.2 (from our ActionBazaar example), a column named CATEGORY_ID in the ITEMS table pointing to the CATEGORY_ID column in the CATEGORIES table signifies the fact that an item belongs in a category. A database foreign key constraint means that the database will ensure every value that is put into the foreign key column exists in the primary key column it points to.