How to develop a simple online exam system using MySQL and Python

How to use MySQL and Python to develop a simple online examination system

Introduction:
With the development of technology and the popularity of the Internet, more and more Schools and training institutions are beginning to use online exams to assess student learning. This article will introduce how to use MySQL and Python to develop a simple online examination system, and provide specific code examples.

1. Requirements analysis:
Before developing an online examination system, it is first necessary to clarify the system requirements. A simple online examination system needs to implement the following functions:

1. Registration and login of student users and administrator users;
2. Administrator users can add, delete and modify test questions and test information ;
3. Student users can choose to take exams in different subjects;
4. Student users can take exams and automatically calculate scores;
5. Student users can view their own exam records and scores.

2. System design:

1. Database design:
   The database of the online examination system can use MySQL, and the following tables can be designed:
2. User table (User): stores basic information of users, including user ID, user name, password, role (student/administrator) and other fields;
3. Chart of subjects (Subject): stores basic information of subjects, Including fields such as subject ID, subject name;
4. Question table (Question): stores the basic information of the test question, including question ID, subject ID, questions, options, answers and other fields;
5. Exam table (Exam): stores the basic information of the exam, including exam ID, subject ID, exam name, start time, end time and other fields;
6. Exam record table (Record): stores the records of students taking the exam, including records ID, user ID, test ID, score and other fields.

7. System architecture:
   The online examination system can use Python as the back-end development language and use the Flask framework to quickly build web applications. The system architecture is as follows:

                         --------> 考试页面
                        |

   User----> Login/Registration----> Homepage--------> Exam Records/Results

                        |
                        --------> 管理页面
   

3. System implementation:

1. Build environment:
   First you need to install MySQL database and Python, and install Flask, Flask-MySQLdb and other related libraries through pip.
2. Database operation:
   Use Python to connect to the MySQL database and implement various database operations, including user registration, login, test question management, test management, test record query, etc.
3. Front-end page:
   Use HTML, CSS and JavaScript to develop front-end pages to achieve user interface and operation interaction.
4. Back-end logic:
   Write Python back-end logic, receive front-end requests through the Flask framework, call the corresponding function for processing, and return the results to the front-end.

4. Code example:
The following is a simple code example that implements user registration and login functions:

'''
from flask import Flask , request, render_template, redirect, url_for
from flask_mysqldb import MySQL

app = Flask(__name__)
app.config['MYSQL_HOST'] = 'localhost'
app.config[' MYSQL_USER'] = 'root'
app.config['MYSQL_PASSWORD'] = 'password'
app.config['MYSQL_DB'] = 'online_exam'

mysql = MySQL(app)

@app.route('/')
def index():

return render_template('index.html')

@app.route('/register', methods=['GET', 'POST'] )
def register():

if request.method == 'POST':
    username = request.form['username']
    password = request.form['password']
    cur = mysql.connection.cursor()
    cur.execute("INSERT INTO User(username, password) VALUES(%s, %s)", (username, password))
    mysql.connection.commit()
    cur.close()
    return redirect(url_for('index'))
return render_template('register.html')

@app.route('/login', methods=['GET', 'POST'])
def login():

if request.method == 'POST':
    username = request.form['username']
    password = request.form['password']
    cur = mysql.connection.cursor()
    cur.execute("SELECT * FROM User WHERE username = %s AND password = %s", (username, password))
    user = cur.fetchone()
    if user:
        return 'Login success'
    else:
        return 'Login failed'
    cur.close()
return render_template('login.html')

if name == '__main__':

app.run()

'''

Summary:
By combining MySQL and Python, you can easily develop a Simple online exam system. This article introduces the requirements analysis, system design and implementation steps of the online examination system, and provides a code example for user registration and login. Readers can modify and improve it according to actual needs and specific situations.

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