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If class A needs to create an instance of class B, you can transform the coupling between A and B from UTC into ATC by using an active builder as follows: 1. Introduce a Builder class. 2. Make the Builder create an instance of A. 3. Make the Builder create an instance of B, or a derived class. 4. Have the builder pass a reference to B (or derived class) to the created instance of A.

Yes, you heard me right. The reason I make this claim is that if you write your code in PL/SQL, you have ensured that Your code can be invoked by any other language that has the ability to connect and talk to Oracle. This includes C, C++, and Java, among other languages. Your code is automatically ported to all operating systems to which Oracle is ported (which include most popular flavors of UNIX and Windows). Those who claim that writing in PL/SQL will tie your code to a database overlook the fact that if you don t exploit a database fully, you re simply not getting your money s worth. If you pursue this strategy, not only does performance suffer but also you ll get code that will give incorrect results when used directly against another database. In most cases, database independence isn t a real requirement. Developing code in a database-independent way by restricting developers to use a subset of common features is analogous to a right-handed swordsman fighting a duel with his left hand odds are that it is a losing fight. In the relatively rare case you do need to write code that works against different databases, your data access layer should be written using the procedural language of the database (e.g., PL/SQL in Oracle, Transact-SQL in SQL Server, and so on). This way you ensure (among other things) that Your code exploits all features of the database and the ones offered by a stored procedure language such as PL/SQL. Your Java code is largely independent of the database (assuming you use the SQL92 syntax of invoking procedures from JDBC). Your code can be accessed by applications written in any other language and from all the tools that know how to invoke a stored procedure.

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Signature coupling is a coupling flavor that has a dynamic nature. Given that you can never completely eliminate coupling from a system, signature coupling is sometimes the most desirable flavor of coupling. Given two classes, A and B, assume A has ATC to B due to the fact that A uses a typed reference to invoke a method in B. Figure 1-46 shows the coupling diagram:

PL/SQL Code Is Compact (Fewer Lines of Code)

1. Select a cell in the formatted Excel Table, and on the Ribbon, click the Design tab. 2. At the left end of the Ribbon, in the Properties group, type a one-word name, such as SalesData, in the Table Name box (see Figure 1-3).

+M1()

Compared to code written in Java (or, for that matter, any other language), if a piece of code involves SQL statements, the PL/SQL version is likely to be much more compact. For example, if you want to write a procedure that fetches all employees who have a given job title from the emp table and do some processing on them, in PL/SQL you can write create or replace procedure process_employees( p_job in varchar2 ) is begin for i in ( select * from emp where job = p_job ) loop dbms_output.put_line( 'processing the record of ' || i.ename ); -- processing code

Figure 1-46. Two classes coupled by ambiguous type coupling Listing 1-14 shows a simple C# implementation. Listing 1-14. A Simple Implementation, Causing ATC Between A and B public class A { public void UseB(B theB) { theB.M1(); // call method of B } } public class B { public void M1() { // ... } } Class A doesn t instantiate class B, but instead receives a reference to B from another object. To eliminate the ATC between A and B, you need to remove from A the reference to type B. Instead of class A calling a method through the interface B, make A call B.M1 using a method reference. Use an active Builder to initialize A s method reference, resulting in the coupling diagram shown in Figure 1-47.

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