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Database driven Web App using Flask and SQLite (Web Form insert to database)

Subject: Flask: Python Web Development
In this topic we will be:
1. Create a web form (Student Record Setup) using HTML
2. Make the form to submit to a URL that will process or insert (store) the record into the student table in our tealearn_grades.db database.

Here is the update I made to the app.py file 

from flask import Flask, render_template, request 
import sqlite3, os 
app = Flask(__name__) 

#get the current path name our app
dir_path = os.path.dirname(os.path.realpath(__file__))

#create and connect to the database in our current folder		
conn = sqlite3.connect(dir_path+'/tealearn_grades.db', check_same_thread=False) 

@app.route('/') 
def index(): 
  return render_template('index.html') 

@app.route('/student') 
def student(): 
  return render_template('student.html')

@app.route('/addstudent', methods=['GET', 'POST']) 
def addstudent(): 
  if request.method == 'POST': 
    surname = request.form['surname'] 
    othernames = request.form['othernames'] 
    address = request.form['address'] 
    
    conn.execute('INSERT INTO student (surname_name,other_name,address_address) VALUES (?,?,?)',(surname, othernames, address)) 
    conn.commit() 
    output="Student record saved"
  return render_template('student.html', msg=output) 

#other code continue here...
#@app.route('/dbsetup') 
#def dbsetup(): 
#	sql_create_student_table....

if __name__ == '__main__': 
       app.run(debug=True)


Notice that I have to bring the sqlite3.connect('tealearn_grades.db'.... up here, so that all functions in this file that need database access can share just this one connect.

And we have the student.html created in the templates folder as usual. 


<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Students Record</title>
</head>

<body>
<h2>School Grading System</h2>
    <hr/>
    <a href="/student">Students</a> | 
    <a href="#">Subjects</a> | 
    <a href="#">Instructor</a> | 
    <a href="#">Score Sheet</a> 
    <hr/>
    <h2>Setup Student Record</h2>
  
<a href="/">Back to home</a><br/>
  
{% if msg %}
  <p><b>{{ msg }}</b></p>
{% endif %}
    <form method="POST" action ="/addstudent">
      Surname: <br/>
      <input type="text" name="surname" />
      <br/>
      
      Other names: <br/>
      <input type="text" name="othernames" />
      <br/>
      
      Address: <br/>
      <textarea name="address"></textarea>
      
      <br/>
      <input type="submit" name="Save" value="Submit"/>
  </form>
</body>
</html>


I have to create an index.html for this "School Grading System" 


<!DOCTYPE html>
<html>
<head>
    <title>School Grading System</title>
</head>
<body>
    <h2>School Grading System</h2>
    <hr/>
    <a href="/student">Students</a> | 
    <a href="#">Subjects</a> | 
    <a href="#">Instructor</a> | 
    <a href="#">Score Sheet</a> 
    <p>
      Welcome to my web app
    </p>
 </body>
 </html>


We I ran the app.py I navigated from the index or home to the student URL then completed the form twice, and I used the SQLite views to see if the record is insert successful.

Site structure with templates and static folder with files



Completing the form



After submitting the form, it return to same URL with the message....



https://sqliteviewer.app/ SQLite viewer showing records in student table of our database




By: Benjamin Onuorah

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