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Rarely have I encountered an application where I actually delete data from a table. Instead, applications work with the idea of inactivating or invalidating an entry. Method inactivate() handles inactivation. If you have a code table, you can t delete a code value that s in use (one that has any relationships). Yet, you may want to stop users from using an outdated code value. To do so, you write your code value s SELECT statement to utilize the code s inactive date, and then you set a code s inactive date so users can no longer select it from a list of values. Along the same line of thinking, if you have a content table, and a particular entry has relationships, but you no longer want users to select the content table entry, you can set its inactive date and prevent it from appearing in the presentation layer. Just as with the code, the content entry has historical significance but is no longer to be used. With an intersection table, the concept is slightly different. With an intersection, the assignment of a relationship between two tables exists for the period of time defined from its active date through its inactive date. So when you inactivate an intersection entry, you re simply defining the end of a historical relationship. Regardless of the type of table for which an entry is inactivated, inactivate() does the same thing: it sets the inactive date. The following is an example of an inactivate() method from content table package LOGICAL_WORKPLACE_TS:

PROCEDURE inactivate( ain_logical_workplace_id in LOGICAL_WORKPLACE_T.logical_workplace_id%TYPE, aid_inactive_date in LOGICAL_WORKPLACE_T.inactive_date%TYPE) is begin update LOGICAL_WORKPLACE_T set inactive_date = aid_inactive_date where logical_workplace_id = ain_logical_worplace_id; end inactivate; That s straightforward enough. Now let s look at methods used by all packages and TYPEs.

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Persistence transparency or orthogonality implies that objects are treated without any implicit notion of persistence Most of the existing tools aren t truly transparent, yet they provide a good separation of concerns by isolating the persistence of objects behind very simple object-oriented constructs In Hibernate for example, transparency means that the Plain Old Java Objects (POJOs) being mapped have no notion that they are persistent objects Also worthy of consideration is how to fit the way a certain tool works with the rest of your development process With some tools, you start with an object model and derive a relational persistence model; with others, you start with a relational model and derive an object model.

Again, you follow the same procedure: Is the number to the right of the middle of the sequence If it isn t, Is it in the second quarter (to the right of the middle of the left half) and so on You keep an upper and a lower limit to where the number may be, and keep splitting that interval in two with every question The point is that this algorithm lends itself naturally to a recursive definition and implementation Let s review the definition first, to make sure we know what we re doing: If the upper and lower limits are the same, they both refer to the correct position of the number, so return it Otherwise, find the middle of the interval (the average of the upper and lower bound), and find out if the number is in the right or left half.

I expect some methods to exist in every package or TYPE. You ve already been introduced to methods help and test. I have one new one here named initialize. Let s start with help.

Method help should display help text for the package or TYPE for which it is executed. PROCEDURE help was covered extensively in 9. You should code this method to display help text in whatever manner you find suitable. What I showed you in 9 was just an example. But, whatever you do, you must be consistent; otherwise, programmers won t consider the help as reliable documentation, and then you ll have defeated the purpose of coding the method altogether. The following is an example of the method from code table package WORKER_TYPE_TS: PROCEDURE help is begin TEXT_HELP.process('WORKER_TYPE_TS'); end help; In this example, PROCEDURE process() in package TEXT_HELP will format and display the contents of the associated specification.