Student Management Class: Adding, Deleting, Searching, and Changing Student Information

/**

• The StudentManager class is responsible for managing student information. */ public class StudentManager {

  /**

  • Adds a new student to the database.

  • @param t The Student object representing the new student.

  • @return True if the student information was successfully added, false otherwise.

  • @throws SQLException if there is an error in executing the SQL statement.

  • @throws UnknownHostException if the IP address of the host could not be determined.

  • @throws IOException if an I/O error occurs. */ public static boolean AddStudentInfo(Student t) throws SQLException, UnknownHostException, IOException { Message temp=new Message(); temp.addObject(t);

    temp.changeOperateType("AddStudent");

    boolean answer= ClientSR.sendAndReceive(temp,false);

    return answer; }

  /**

  • Deletes a student from the database.

  • @param id The ID of the student to be deleted.

  • @return True if the student information was successfully deleted, false otherwise.

  • @throws SQLException if there is an error in executing the SQL statement.

  • @throws UnknownHostException if the IP address of the host could not be determined.

  • @throws IOException if an I/O error occurs. */ public static boolean DeleteStudentInfo(String id) throws SQLException, UnknownHostException, IOException {
    Message temp=new Message(); temp.addObject(id);

    temp.changeOperateType("DeleteStudent");

    boolean answer= ClientSR.sendAndReceive(temp,false);

    return answer;

  }

  /**

  • Searches for students in the database.

  • @param sname The name of the student to search for.

  • @return An ArrayList of Student objects matching the search criteria.

  • @throws SQLException if there is an error in executing the SQL statement.

  • @throws UnknownHostException if the IP address of the host could not be determined.

  • @throws IOException if an I/O error occurs. */ public static ArrayList<Student> SearchStudentInfo(String sname) throws SQLException, UnknownHostException, IOException { Message temp=new Message(); temp.addObject(sname);

    temp.changeOperateType("SearchStudent"); ArrayList<Student> answer= ClientSR.sendAndReceive(temp,new ArrayList<Student>());

    return answer;

  }

  /**

  • Changes the information of a student in the database.

  • @param t The Student object representing the updated student information.

  • @return True if the student information was successfully updated, false otherwise.

  • @throws SQLException if there is an error in executing the SQL statement.

  • @throws UnknownHostException if the IP address of the host could not be determined.

  • @throws IOException if an I/O error occurs. */ public boolean ChangeStudentInfo(Student t) throws SQLException, UnknownHostException, IOException { Message temp=new Message(); temp.addObject(t);

    temp.changeOperateType("EditStudent");

    boolean answer= ClientSR.sendAndReceive(temp,false);

    return answer; }

  static int idx=0; static int page_limit=10;

  private static int max(int idx2, int i) { // TODO Auto-generated method stub int max=0; if(idx2>i) { max=idx2; } else max=i; return max; }

  /**

  • Displays a page of students from the database.
  • @return An ArrayList of Student objects representing the students to be displayed.
  • @throws UnknownHostException if the IP address of the host could not be determined.
  • @throws IOException if an I/O error occurs. / static public ArrayList<Student> display() throws UnknownHostException, IOException { Message message = new Message(); message.addObject(page_limit); message.addObject(idxpage_limit); message.changeOperateType("GetAllStu"); ArrayList<Student> rooms= ClientSR.sendAndReceive(message,new ArrayList<Student>()); return rooms;

  }

  /**

  • Moves to the previous page of students in the database.

  • @return An ArrayList of Student objects representing the students on the previous page.

  • @throws UnknownHostException if the IP address of the host could not be determined.

  • @throws IOException if an I/O error occurs. */ public static ArrayList<Student> prev_page() throws UnknownHostException, IOException {

    idx--; idx=max(idx,0); return display(); }

  /**

  • Moves to the next page of students in the database.
  • @return An ArrayList of Student objects representing the students on the next page.
  • @throws UnknownHostException if the IP address of the host could not be determined.
  • @throws IOException if an I/O error occurs. */ public static ArrayList<Student> next_page() throws UnknownHostException, IOException { ArrayList<Student> list = display(); idx++; if(list.size()<10) { idx--; } return list; } }