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A couple methods are applicable to almost all, if not all, table packages and object TYPEs. They are get_id and inactivate(). The method get_id is shown without parentheses because it takes no arguments. From my point of view, these black box methods should exist in every table package and object TYPE. Let s start with get_id.

Method get_id allocates and returns a new primary key value from an underlying Oracle sequence. FUNCTION get_id acts as an abstraction layer between the underlying Oracle sequence and PL/SQL. This abstraction layer allows you to later change the means by which you allocate a primary key value without having to recode any PL/SQL program units that call the method. The following is an example of the get_id method from code table package WORKER_TYPE_TS: FUNCTION get_id return n_worker_type_id begin select WORKER_TYPE_ID_SEQ.nextval into n_worker_type_id from SYS.DUAL; return n_worker_type_id; end get_id;

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reflect well the problem domain while ensuring the integrity, reusability, and efficient use of the data. All of my previous remarks are based on the notion of having a domain model that represents the problem domain that your application is targeting. But domain modeling is just one approach to solving a problem. A lot of the typical Internet applications we use on a daily basis have a more data-driven, relational/procedural flavor to them and are better suited to be constructed in a way that exploits those characteristics, that is using a language that can take advantage of the relational model. Yes, you guessed it right, SQL. For very simple applications with very simple CRUD (create, read, update, and delete) interactions with the database and where performance is the number-one priority, raw SQL might still be the right choice. That being said, it is important to foresee the evolution of an application to determine whether you should start with an object-relational mapping (ORM) tool from the onset, plain SQL or whether you will intermix both approaches in a single application.

As a final example of recursion in practice, let s have a look at the algorithm called binary search. You probably know of the game where you are supposed to guess what someone is thinking about by asking 20 yes-or-no questions. To make the most of your questions, you try to cut the number of possibilities in (more or less) half. For example, if you know the subject is a person, you might ask Are you thinking of a woman You don t start by asking Are you thinking of John Cleese unless you have a very strong hunch. A version of this game for those more

WORKER_TYPE_T.worker_type_id%TYPE is WORKER_TYPE_T.worker_type_id%TYPE;

inactivate()

Object-relational mapping (ORM) is the name given to the technologies, tools, and techniques used to bridge the divide between objects and relational databases ORM tools allow you to declaratively map data objects to data and relations in a relational database, allowing programmers to work with information from a relational database in the form of Java objects This breed of tools generates all of the SQL code needed to interact with the database Developers work at the object level, and the concept of queries and transactions are applied to the objects rather than database objects Although they re under the same umbrella, the tools can vary greatly in the way they work, from the level of transparency to whether they work by generating code, modifying bytecode, or using runtime inspection The concept of transparency as applied to ORM tools is still very vague in the industry.

numerically inclined is to guess a number For example, your partner is thinking of a number between 1 and 100, and you have to guess which one it is Of course, you could do it in a hundred guesses, but how many do you really need As it turns out, you only need seven questions The first one is something like Is the number greater than 50 If it is, then you ask Is it greater than 75 You keep halving the interval until you find the number You can do this without much thought The same tactic can be used in many different contexts One common problem is to find out whether a number is to be found in a (sorted) sequence, and even to find out where it is.