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Similarly, more than about 10 decision points in a routine, more than three levels of logical nesting, an unusual number of variables, high coupling to other classes, or low class or routine cohesion should raise a warning flag None of these signs necessarily means that a class is poorly designed, but the presence of any of them should cause you to look at the class skeptically Any warning sign should cause you to doubt the quality of your program As Charles Saunders Peirce says, Doubt is an uneasy and dissatisfied state from which we struggle to free ourselves and pass into the state of belief Treat a warning sign as an irritation of doubt that prompts you to look for the more satisfied state of belief.

If you find yourself working on repetitious code or making similar modifications in several areas, you should feel uneasy and dissatisfied, doubting that control has been adequately centralized in classes or routines If you find it hard to create scaffolding for test cases because you can t use an individual class easily, you should feel the irritation of doubt and ask whether the class is coupled too tightly to other classes If you can t reuse code in other programs because some.

9

As in the previous chapters, we end this chapter with some practical exercises. See Appendix D for the answers. 1. 2. Look at the example discussed in Listings 10-7, 10-8, and 10-9. Rewrite the query in Listing 10-9 without using a view, by using the WITH operator. Look at Listing 10-12. How is it possible that you can delete employee 7654 via this EMP view There are rows in the HISTORY table, referring to that employee via a foreign key constraint. Look at the view definition in Listing 10-18. Does this view implement the foreign key constraints from the REGISTRATIONS table to the EMPLOYEES and COURSES tables Explain your answer. Create a SAL_HISTORY view providing the following overview for all employees, based on the HISTORY table: For each employee, show the hire date, the review dates, and the salary changes as a consequence of those reviews. Check your view against the following result:

classes are too interdependent, that s another warning sign that the classes are coupled too tightly When you re deep into a program, pay attention to warning signs that indicate that part of the program design isn t defined well enough to code Difficulties in writing comments, naming variables, and decomposing the problem into cohesive classes with clear interfaces all indicate that you need to think harder about the design before coding Wishy-washy names and difficulty in describing sections of code in concise comments are other signs of trouble When the design is clear in your mind, the low-level details come easily Be sensitive to indications that your program is hard to understand Any discomfort is a clue If it s hard for you, it will be even harder for the next programmers They ll appreciate the extra effort you make to improve it.

If you re figuring out code instead of reading it, it s too complicated If it s hard, it s wrong Make it simpler If you want to take full advantage of warning signs, program in such a way that you create your own warnings This is useful because even after you know what the signs are, it s surprisingly easy to overlook them Glenford Myers conducted a study of defect correction in which he found that the single most common cause of not finding errors was simply overlooking them The errors were visible on test output but not noticed (Myers 1978b) Make it hard to overlook problems in your program One example is setting pointers to NULL after you free them so that they ll cause ugly problems if you mistakenly use one A freed pointer might point to a valid memory location even after it s been freed.

SQL> select * from sal_history; EMPNO ----7369 7369 7499 7499 7499 7499 7499 ... 7934 7934 7934 7934 HIREDATE ----------01-JAN-2000 01-JAN-2000 01-JUN-1988 01-JUN-1988 01-JUN-1988 01-JUN-1988 01-JUN-1988 01-FEB-1998 01-FEB-1998 01-FEB-1998 01-FEB-1998 REVIEWDATE SALARY_RAISE ----------- -----------01-JAN-2000 01-FEB-2000 -150 01-JUN-1988 01-JUL-1989 300 01-DEC-1993 200 01-OCT-1995 200 01-NOV-1999 -100 01-FEB-1998 01-MAY-1998 01-FEB-1999 01-JAN-2000 5 10 10