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Most of the time you ll find that you have both an existing object model and a relational model, in which case most tools fall short of expectations and most of the mapping work is manual Sometimes it is impossible to avoid the situation when trade-offs need to be made between your object model and the database schema It s important that both models are developed in cooperation An ORM tool can help this collaborative work, but it s the human factor that plays the larger role Object persistence is, like most hard problems, all about the trade-offs The theme with Java persistence is about choices, as with many things in Java No tool is perfect for every persistence scenario Some tools trade transparency for performance or simplicity for capabilities Some of the questions that arise during the selection (or creation) of an object-relational tool include the following:.

Keep searching in the proper half The key to the recursive case is that the numbers are sorted, so when you have found the middle element, you can just compare it to the number you re looking for If your number is larger, then it must be to the right, and if it is smaller, it must be to the left The recursive part is Keep searching in the proper half, because the search will be performed in exactly the manner described in the definition (Note that the search algorithm returns the position where the number should be if it s not present in the sequence, this position will, naturally, be occupied by another number.

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I know I have not talked about method initialize before, but I feel it s an important part of testing and should exist in any package that uses its initialization section. Just in case you don t know what I mean by initialization section, let me elaborate. A package body is a PL/SQL block. Because it is a PL/SQL block, it has a declaration section, which is where you code any instance variables, functions, procedures, and so on, and it has an executable section. Really, it does. If, after all the functions and procedures you coded, you add the keyword BEGIN, any code from the keyword BEGIN to keyword END at the end of the package body is executed once, and only once, any time the package is instantiated. By instantiated, I mean loaded into memory and initialized. There it is, that word: initialized.

So for any package where I use the initialization section, I add a public PROCEDURE initialize to the package. Why So I can test the code in the initialization section. One of the mysterious errors developers, support personnel, and end users encounter is a NO_DATA_FOUND the first time they try to use a particular package, and then the error magically goes away. This is almost always caused by a SQL SELECT statement executed in the initialization section of a package that can t find a matching row in the database. It happens once, and only once, because the package is initialized once, and only once. A problem like this can be quite elusive. You can go crazy troubleshooting the problem and then testing that your solution works. How do you fix it Create a PROCEDURE initialize where you put your initialization code, and then execute that procedure in the initialization section of your package. Then, you can execute PROCEDURE initialize as many times as you like during testing, without having to log out and in, in order to get the database to initialize the package.

How to convert column values to Java objects and primitives For example, a Java Date object can be mapped to many database types How to model object relationships (such as inheritance, aggregation, and composition) on a database schema or how to model relations between tables in an object or group of objects How to deal with database keys and object identity, which might not exist in the object model How to optimize the resulting SQL calls How to take advantage of proprietary database features such as updatable views and stored procedures How to guarantee referential integrity without limiting the behavioral expressiveness of the object model How to deal with transactions when the database is accessed concurrently from multiple sources From a relational point of view, an object is nothing but an in-memory cache of the database data that must be invalidated and refreshed when appropriate.