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In order to initialize an instance of a Faculty collection, we need to read two data files, as discussed earlier in the chapter. The first half of the initializeFaculty method reads the file that defines Professor objects, and is so similar to the code for the initializeScheduleOfClasses method that I ll present it here without narration (please review the inline comments for details). // Initialize Faculty. Note that we're using a custom Exception type to // signal various errors that may arise during object "reconstitution" // from persistent storage. public static Faculty initializeFaculty() throws SRSInitializationException { Faculty faculty = new Faculty(); String line = null; BufferedReader bIn = null; try { // Open the first file. bIn = new BufferedReader(new FileReader(facultyFileName)); line = bIn.readLine(); while (line != null) { // We're going to parse tab-delimited records into // four attributes -- name, ssn, title, and dept -// and then call the Professor constructor to fabricate a new // professor. StringTokenizer st = new StringTokenizer(line, "\t"); // If there aren't four columns, signal an error. if (st.countTokens() != 4) { throw new SRSInitializationException( "File format error on record |" + line + "| in file " + facultyFileName); } else { String name = st.nextToken(); String ssn = st.nextToken(); String title = st.nextToken(); String dept = st.nextToken(); // Create a Person instance and store it in // the collection.

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Listing 8-20 already showed an example of using the COUNT(*) function, to get the total number of scheduled courses for each trainer from the OFFERINGS table. Listing 8-22 shows another example of using the COUNT(*) function, this time applied against the EMPLOYEES table. Listing 8-22. Count Employees Per Department (First Attempt) select e.deptno, count(*) from employees e group by e.deptno; DEPTNO COUNT(*) -------- -------10 3 20 5 30 6 Obviously, department 40 is missing in this result. If you want to change the query into an outer join in order to show department 40 as well, you must be careful. What s wrong with the query in Listing 823 Apparently, we suddenly have one employee working for department 40. Listing 8-23. Count Employees Per Department (Second Attempt) select deptno, count(*) from employees e right outer join departments d using (deptno) group by deptno; DEPTNO COUNT(*) -------- -------10 3 20 5 30 6 40 1 Compare the results in Listing 8-23 with the results in Listing 8-24. The only difference is the argument of the COUNT function. Listing 8-24 obviously shows the correct result, because department 40 has no employees. By counting over the primary key e.EMPNO, you are sure that all real employees are counted, while the null value introduced by the outer join is correctly ignored. You could have used any other NOT NULL column as well.

Professor p = new Professor(name, ssn, title, dept); faculty.addProfessor(p); } line = bIn.readLine(); } bIn.close(); } catch (IOException i) { throw new SRSInitializationException("Error accessing file " + facultyFileName); } We re not done yet, however we must now process a second data file, which defines the teaching assignments for each Professor. The first part of this processing should by now be very familiar: // Process the second file, which defines teaching assignments. try { // Open the file. bIn = new BufferedReader(new FileReader(assignmentsFileName)); line = bIn.readLine(); while (line != null) { // We're going to parse tab-delimited records // into two values, representing the professor's // SSN and the section number that he/she is // going to teach. StringTokenizer st = new StringTokenizer( line, "\t"); // If there aren't two columns, signal an error. if (st.countTokens() != 2) { throw new SRSInitializationException( "File format error on record |" + line + "| in file " + assignmentsFileName); } else { String ssn = st.nextToken(); // The full section number is a // concatenation of the course no. // and section no., separated // by a hyphen; e.g., "ART101 - 1". String fullSectionNo = st.nextToken();

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