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The familiar example is removing funds from a savings account and depositing those funds in a checking account We want both the withdrawal and the deposit to succeed, but if the withdrawal succeeds and the deposit fails, we want the withdrawal to be rolled back and the money put back into the savings account The two changes constitute a single transaction which must either succeed in its entirety, or be rolled back to have no effects whatsoever Database systems allow changes to the data to be grouped into transactions that are either committed upon full success, or entirely rolled back upon any failure DBMSs also promote data security by organizing use by multiple users Imagine an enterprise like Amazoncom where many users from all over the world interrogate the database of available titles, and place orders, simultaneously The DBMS coordinates multiuser access so as to preserve data integrity.

} } The java.util.AbstractCollection class requires the four methods that are defined here: equals(), hashCode(), iterator(), and size().1 The iterator() method overrides the empty version that is defined in the AbstractCollection class. Its job is to build an iterator object that can traverse its BinaryTree object. To do that, it creates its own anonymous inner Iterator class using the Java return new construct at line 47. The body of this

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anonymous class is defined between the braces that immediately follow the invocation of the constructor Iterator(). Note that this block must be followed by a semicolon because it is actually the end of the return statement. The complete construct looks like a method definition, but it is not. It really is a complete class definition embedded within a return statement. To return an Iterator object, this anonymous class must implement the Iterator interface. (See page 77.) This requires definitions for the three methods

Changes made by one user will not interfere with the use of the database by another The DBMS manages potential conflicts by providing temporary locks on the data when necessary For all these reasons, database systems have become ubiquitous As we will see, the use of database systems has been facilitated, too, by a set of language standards called SQL It is difficult to imagine any substantial application today that does not include a database, or provide a direct link to an existing database MODELING THE DATA DOMAIN Before creating a relational database, the designer goes through a process called data modeling The modeling phase identifies the entities which will be of interest, the attributes of each entity type, and the relationships between different entity types..

public boolean hasNext() ... public Object next() ... public void remove() ... This implementation is recursive. The hasNext() method invokes the hasNext() methods of iterators on the two subtrees, and the next() method invokes the next() methods of those two iterators, named lIt and rIt. The other local variable is a flag named rootDone that keeps track of whether the root

object has been visited yet by the iterator. The hasNext() method returns true unless all three parts of the tree have been visited: the root, the left subtree, and the right subtree. It does that by using the lIt and rIt iterators recursively.

CHAP. 8]

The next() method also uses the lIt and rIt iterators recursively. If the root has already been visited, then the iterator visits the next node in the left subtree if there are any, and otherwise visits the next node in the right subtree if there are any. If the root has not yet been visited, then this must be the first call to the iterator on that particular subtree, so it initializes the lIt and rIt iterators, sets the rootDone flag, and returns the root. The remove() method is not implemented because there is no simple way to remove an internal node from a binary tree.

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For instance, in developing a database for a college, entity types would include students, professors, dormitory buildings, classroom buildings, majors, courses, etc Attributes of a student would include name, address, dorm, room number, major, advisor, etc One relationship between entity types would be the advisor/ advisee relationship between a professor and a student Entities are the things, the nouns, the database will store Often entity types correspond to classes of real-world objects, such as professors, cars, and buildings Sometimes entity types correspond to more abstract objects, like a college within a university, an order for an on-line bookstore, and a privilege afforded a group of users A big part of data modeling is deciding which entity types to model For those familiar with object-oriented programming concepts, an entity type is similar to a class.

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