Java implements test score report generation in online examination system

Java implements test score report generation in online examination system

In today's educational development, more and more schools and institutions adopt online examinations. Assessment of student performance. The online examination system not only provides a more convenient examination method, but also automatically generates examination score reports, greatly reducing the workload of teachers.

This article will introduce how to use Java language to implement the test score report generation function in the online examination system. We will use the Java programming language and some common development tools, such as Eclipse, MySQL, etc.

1. Database design
   First, we need to design a database for storing test scores. You can create a database named "exam_results", which contains the following tables:

• Student information table (students): including student ID, student name and other fields.
• Examination information table (exams): includes fields such as exam ID, exam name, etc.
• Grades table (grades): includes fields such as student ID, test ID, and grades.

2. Java code implementation
   Next, we will use the Java programming language to implement the test score report generation function. The following is a simple sample code:

import java.sql.*;

public class ExamReportGenerator {
   public static void main(String[] args) {
      try {
         // 连接数据库
         Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/exam_results", "root", "password");
         Statement stmt = conn.createStatement();
         
         // 查询学生信息和对应的考试成绩
         String query = "SELECT students.student_id, students.student_name, exams.exam_name, grades.grade " +
                        "FROM students " +
                        "INNER JOIN grades ON students.student_id = grades.student_id " +
                        "INNER JOIN exams ON exams.exam_id = grades.exam_id";
         ResultSet rs = stmt.executeQuery(query);
         
         // 输出考试成绩报告
         while (rs.next()) {
            int studentId = rs.getInt("student_id");
            String studentName = rs.getString("student_name");
            String examName = rs.getString("exam_name");
            int grade = rs.getInt("grade");
            
            System.out.println("学生ID: " + studentId);
            System.out.println("学生姓名: " + studentName);
            System.out.println("考试名称: " + examName);
            System.out.println("成绩: " + grade);
            System.out.println("-------------------------");
         }
         
         // 关闭连接
         rs.close();
         stmt.close();
         conn.close();
      } catch (SQLException e) {
         e.printStackTrace();
      }
   }
}

The above code first connects to the database, then executes a SQL query to obtain the student's student number, name, exam name and score, and outputs it to the control tower. Finally close the connection.

In actual applications, you can modify the code as needed to adapt to specific needs, such as saving test score reports as files or sending emails.

3. Run the program
   Save the code as the ExamReportGenerator.java file, and compile and run the program in the command line. Make sure the Java Development Kit (JDK) and MySQL database are installed on your computer.

$ javac ExamReportGenerator.java
$ java ExamReportGenerator

If everything is OK, you will see the output of the test score report.

Summary:
By using Java language and SQL query, we can easily implement the test score report generation function in the online examination system. By appropriately modifying the code, we can also implement more advanced functions, such as filtering results under specific conditions, generating reports according to certain sorting rules, etc. Whether it is a school or an educational institution, the test score report generation function of the online examination system will greatly improve the work efficiency of teachers, and it will also make it easier for students to understand their scores.

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