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Figure 7-11. CREATE INDEX command syntax diagram The storage clause allows you to influence various physical index storage attributes, such as the storage location and the space allocation behavior. See the Oracle SQL Reference for more details. If the table rows happen to be inserted and stored in index order, you can specify the NOSORT option to speed up index creation. The Oracle DBMS will skip the sort phase (normally needed during index creation), but if the rows turn out to be in the wrong order, the CREATE INDEX command will fail with an error message.

When a Student enrolls in a Section, this method will be used to pass a reference to that Section to the Student object so that the Section reference may be stored in the attends ArrayList: public void addSection(Section s) { attends.add(s); }

This is yet another example of delegation: the Student object is delegating the work of organizing Section references to its encapsulated collection.

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If you learn only one thing from this chapter, let it be this: Never under any circumstances trust data from the browser. You never know who s on the other side of that HTTP connection. It might be one of your users, but it just as easily could be a nefarious cracker looking for an opening. Any data of any nature that comes from the browser needs to be treated with a healthy dose of paranoia. This includes data that s both in band (i.e., submitted from Web forms) and out of band (i.e., HTTP headers, cookies, and other request information). It s trivial to spoof the request metadata that browsers usually add automatically. Every one of the vulnerabilities discussed in this chapter stems directly from trusting data that comes over the wire and then failing to sanitize that data before using it. You should make it a general practice to continuously ask, Where does this data come from

Unique indexes serve two purposes: they provide additional access paths to improve response times (like nonunique indexes), and they also prevent duplicate values. You create unique indexes by specifying the UNIQUE option of the CREATE INDEX command (see Figure 7-11). Note, however, that it is recommended to ensure uniqueness in your tables using the PRIMARY KEY and UNIQUE constraints, leaving it up to the Oracle DBMS to choose an appropriate physical implementation of those constraints.

dropSection()

When a Student withdraws from a Section, this method will be used to pass a reference to the dropped Section to the Student object. The Student object in turn delegates the work of removing the Section to the attends ArrayList by invoking its remove method: public void dropSection(Section s) { attends.remove(s); }

Regular indexes work the best if the corresponding columns contain many different values, resulting in better selectivity. Unique indexes offer the best selectivity, because they contain only different values. This means that every equality search (... WHERE COL = ...) results in at most one row. At the other side of the spectrum, if a column contains only a few values (typical examples are gender, status, and yes/no columns), a regular index is not very useful, because the average selectivity of equality searches will be poor. For such low-cardinality columns, the Oracle DBMS supports bitmap indexes. Bitmap indexes may also outperform regular indexes if your WHERE clause is complicated, using many AND, OR, and NOT connectives. You create bitmap indexes by specifying the BITMAP option (see Figure 7-11).

SQL injection is a common exploit in which an attacker alters Web page parameters (such as GET/POST data or URLs) to insert arbitrary SQL snippets that a naive Web application executes in its database directly. It s probably the most dangerous and, unfortunately, one of the most common vulnerabilities out there. This vulnerability most commonly crops up when constructing SQL by hand from user input. For example, imagine writing a function to gather a list of contact information from a contact search page. To prevent spammers from reading every single email in our system, we ll force the user to type in someone s username before providing her email address: def user_contacts(request): user = request.GET['username'] sql = "SELECT * FROM user_contacts WHERE username = '%s';" % username # execute the SQL here...

isEnrolledIn()

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