Java programming to implement batch import of answers in the online examination system

Java programming realizes batch import of answers in the online examination system

In the modern education system, the online examination system is widely used for the assessment and evaluation of students. In a complete online examination system, the import of answers is a key function. It saves teachers and administrators time, increases productivity, and ensures answer accuracy. This article will introduce how to use Java programming to implement batch import of answers in the online examination system, and provide specific code examples.

1. Database design

Online examination systems usually require the use of a database to store examination questions and answers. In this article, we use MySQL as the database. First, we need to design a data table to store question information, including question number, question content, etc.

create table question (
    id int primary key,
    content varchar(200) not null
);

Then, we need to design a data table to store answer information, including the answer number, associated question number, answer content, etc.

create table answer (
    id int primary key,
    question_id int,
    content varchar(200) not null,
    foreign key (question_id) references question(id)
);

2. Code implementation

In Java programming, we can use JDBC to connect to the database and perform related operations. First, we need to import the JDBC related class libraries provided in Java.

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;

Then, we can define a method to implement batch import of answers.

public void importAnswers(List<Answer> answers) {
    String url = "jdbc:mysql://localhost:3306/exam";
    String username = "root";
    String password = "123456";
    
    try (Connection connection = DriverManager.getConnection(url, username, password)) {
        String sql = "insert into answer (id, question_id, content) values (?, ?, ?)";
        PreparedStatement statement = connection.prepareStatement(sql);
        
        for (Answer answer : answers) {
            statement.setInt(1, answer.getId());
            statement.setInt(2, answer.getQuestionId());
            statement.setString(3, answer.getContent());
            statement.addBatch();
        }
        
        statement.executeBatch();
    } catch (SQLException e) {
        e.printStackTrace();
    }
}

In the above code, we first established a connection with the database and defined the relevant SQL statements. Then, we use the PreparedStatement object to set parameters and import answer information into the database in batches. Finally, we perform batch operations.

3. Test example

In order to verify the correctness of the code, we can write a simple test example to call the above importAnswers method.

public class Main {
    public static void main(String[] args) {
        List<Answer> answers = new ArrayList<>();
         answers.add(new Answer(1, 1, "A"));
         answers.add(new Answer(2, 2, "B"));
         answers.add(new Answer(3, 3, "C"));
        
         importAnswers(answers);
    }
}

In the above example, we created a list of Answer objects and added several answers to it. Then, we called the importAnswers method to batch import the answers into the database.

Summary:

This article introduces how to use Java programming to implement batch import of answers in the online examination system, and provides specific code examples. The batch import function of answers can provide convenience for managers of online examination systems and improve work efficiency. However, in order to implement a complete online examination system, various other functional and security issues need to be considered. Implementing a complete online exam system using these sample codes will require more work and technical knowledge. I hope this article will be helpful to readers on Java programming to implement batch import of answers in the online examination system.

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