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Django includes a built-in, lightweight Web server you can use while developing your site. We ve included this server so you can develop your site rapidly, without having to deal with configuring your production Web server (e.g., Apache) until you re ready for production. This development server watches your code for changes and automatically reloads, helping you make many rapid changes to your project without needing to restart anything. Change into the mysite directory, if you haven t done so already, and run the command python manage.py runserver. You ll see something like this: Validating models... 0 errors found. Django version 0.96, using settings 'mysite.settings' Development server is running at http://127.0.0.1:8000/ Quit the server with CONTROL-C.

First, we ll look at the code of the inner class in isolation; aside from the fact that we don t declare it as a public class, it otherwise looks like a typical class class GradeBook { // For every Student, we store his/her grade as // a String value: eg, "B+" private HashMap<Student, String> grades; // Constructor public GradeBook() { grades = new HashMap<Student, String>(); } // Accessor methods public void setGrade(Student s, String grade) { // Delegation gradesput(s, grade); }.

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Figure 7-4. ALTER TABLE constraint manipulation syntax Just like the CREATE TABLE command, the ALTER TABLE command also allows you to influence various physical table storage attributes. In general, you can apply any structure change to existing tables, even when they contain rows. However, there are some exceptions. For example, for obvious reasons you cannot add a NOT NULL column to a nonempty table, unless you immediately specify a DEFAULT value in the same ALTER TABLE command. Listing 7-2 shows an example. Listing 7-2. ALTER TABLE Command Example SQL> alter table registrations 2 add (entered_by number(4) default 7839 not null); Table altered. SQL> alter table registrations 2 drop column entered_by; Table altered. SQL>

public String getGrade(Student s) { // Delegation. return grades.get(s); } } Now, let s look at the GradeBook class in the context of its enclosing outer class, Course: import java.util.*; public class Course { private String name; private ArrayList<Student> enrolledStudents; // We're using "GradeBook" as a type for one of // the Course's attributes. private GradeBook gradeBook; public Course(String name) { this.name = name; enrolledStudents = new ArrayList<Student>(); // We're instantiating a GradeBook object. gradeBook = new GradeBook(); } public void assignGrade(Student s, String grade) { // Delegation. gradeBook.setGrade(s, grade); } public String lookUpGrade(Student s) { // Delegation. return gradeBook.getGrade(s); } // Our inner class. The symbol "GradeBook" is only // recognized by the compiler within the scope of // the Course class; we can't reference GradeBook // as a type anywhere else. class GradeBook { // For every Student, we store a grade as // a String value: e.g., "B+". private HashMap<Student, String> grades;

Although the development server is extremely nice for, well, development, resist the temptation to use this server in anything resembling a production environment. The development server can handle only a single request at a time reliably, and it has not gone through a security audit of any sort. When the time comes to launch your site, see 20 for information on how to deploy Django.

// Constructor. public GradeBook() { grades = new HashMap<Student, String>(); // etc. } // Other methods. public void setGrade(Student s, String grade) { grades.put(s, grade); } public String getGrade(Student s) { return grades.get(s); } } // end inner class declaration } // end outer class declaration We may write client code as follows: public class MyApp { public static void main(String[] args) { Course c = new Course("MATH 101"); Student s1 = new Student("Fred"); c.assignGrade(s1, "B-"); Student s2 = new Student("Cynthia"); c.assignGrade(s2, "A+"); // etc. // Later on: System.out.println(s1.getName() + " received a grade of " + c.lookUpGrade(s1)); System.out.println(s2.getName() + " received a grade of " + c.lookUpGrade(s2)); // etc. } } Here s the output: Fred received a grade of BCynthia received a grade of A+ However, if we were to try to reference GradeBook as a type anywhere outside of the Course class

Note The ALTER TABLE statement is probably the best illustration of the power of the relational model. Think about this: you can change a table definition while the table contains data and applications are running.

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