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For the examples mentioned so far in this chapter, you could argue that you could implement them very well with standard relational techniques, as discussed in previous chapters of this book. You could separate various phone numbers into separate columns, you could create a separate ERRATA table with a foreign key constraint referring to the COURSES table, and so on. So when should you choose an object-relational approach rather than a pure relational approach It might be a matter of taste, and discussions about taste are probably a waste of time in a technical book like this one. As the Romans said, De gustibus non disputandum est... 1 It might be the case that you have a powerful object-oriented design and development environment. You may find that Oracle s object-relational features enable you to maintain an intuitive and straightforward mapping between that development environment and the Oracle database structures. In any case, this book does not speculate about when one approach is better than the other. The examples in this chapter have a single purpose: to illustrate the object-relational features of the Oracle DBMS. As you read about the techniques described in this chapter, you may wonder whether they violate the first normal form as one of the foundations of the relational model. That is not the case. The relational model does not forbid in any way storing complex or set-valued attributes in your rows. Data atomicity is a rather slippery concept. For example, if you consider DATE values, aren t you looking at a compound datatype A DATE value has meaningful subcomponents, such as year, month, and day. For a thorough treatment of this subject, see An Introduction to Database Systems (8th Edition), by Chris Date.

We will begin to explore varrays by implementing the phone list example introduced in the previous section. To keep our EMPLOYEES table unimpaired, we create a copy of the EMPLOYEES table for our experiments in this final chapter of the book. We also leave out some of the columns of the original EMPLOYEES table. See Listing 12-1. Listing 12-1. Creating a Copy of the EMPLOYEES Table SQL> 2 3 4 create table e as select empno, ename, init, mgr, deptno from employees;

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You detect touches in the same way as ordinary iPhone development, through the ccTouchesBegan method. First you make sure it s a single tap, then get the coordinates of the touch and convert them to landscape mode. If the deal button was tapped, you will need to deal new cards. Otherwise, you check to see if any card was tapped (see the next section for details). If a card is tapped, and it can be locked (first draw), then the card moves down into the lock position or up if it is already locked, as can be seen in Figure 8 9 and Listing 8 32.

Bought two Robosapiens but can t get them to fight because the controllers are on the same frequency Here s a simple modification using household materials that allows your robot to fight, with a friend or against another robot in automatic mode. Take a standard toilet-roll tube and cut it down the middle. Squeeze it onto Robosapien s head as shown below.

Before we can add a list of phone numbers for every employee in the E table, we must create a corresponding type first, as shown in Listing 12-2.

Figure 8 9. Locking cards in preparation for second draw Listing 8 32. Process Taps - (void)ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { // Get UITouch object UITouch *touch = [touches anyObject]; NSUInteger numTaps = [[touches anyObject] tapCount]; // Only process if single tap. if ( numTaps == 1 ) { // Find point of touch CGPoint location = [touch locationInView: [touch view]]; // Convert point to landscape mode CGPoint touchPoint = [[CCDirector sharedDirector] convertToGL:location];

Listing 12-2. Creating and Describing a Type SQL> create or replace type numberlist_t 2 as varray(4) of varchar2(20); 3 / Type created. SQL> describe numberlist_t numberlist_t VARRAY(4) OF VARCHAR2(20) SQL> select type_name, typecode 2 from user_types; TYPE_NAME TYPECODE ------------------------ -----------------------------NUMBERLIST_T COLLECTION SQL> Note that you must end the CREATE TYPE command in Listing 12-2 with a slash (/) in the third line, although you ended the second line with a semicolon. The reason is that you are not entering an SQL or an SQL*Plus command; you re entering a PL/SQL command. Note also that from now on, you can use this NUMBERLIST_T type as often as you like. It is known to the database, and its definition is stored in the data dictionary. You can query the USER_TYPES data dictionary view to see your own type definitions.

Figure 9-10. In the finished mod, note the Chinese toilet paper tube!

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