CODEWITHSUNDEEP
pythonsqliteflask
curioso
curioso

Reputation: 195

Form doesn't save data permanently

Trying to create a simple web form with flask and sqlite3 I faced the following problem:

I ran flask, enter some test names and emails, see them displayed on the index page but when I go check the database for the latest rows the new data doesn't show up. In turn a new lecture.db-journal file appeared in the directory.

I don't know what is causing this behaviour so hopefully someone here can give me some insight on what I'm doing wrong. Here is the application.py:

from flask import Flask, render_template, request, redirect
import sqlite3

app = Flask(__name__)

# Connect with the lecture registrants database.
# Database structure - 'id' INTEGER | 'name' VARCHAR(255) | 'email' VARCHAR(255) 
connection = sqlite3.connect("lecture.db")
# Setting row_factory property of
# connection object to sqlite3.Row(sqlite3.Row is an implementation of
# row_factory).
connection.row_factory = sqlite3.Row
# cursor
db = connection.cursor()

# Display all the people who registered on the route page.
@app.route("/")
def index():
    sql_command = "SELECT * FROM registrants;"
    db.execute(sql_command)

    rows = db.fetchall()
    # Returns a list of dictionaries, each item in list(each dictionary)
    # represents a row of the table.

    return render_template("index.html", rows=rows)

@app.route("/register", methods=["GET", "POST"])
def register():
    if request.method == "GET":
        return render_template("register.html")
    else:
        # Update the database with the new name and email.
        name = request.form.get("name")
        email = request.form.get("email")

        sql_command = "INSERT INTO registrants (name, email) VALUES (?, ?);"
        db.execute(sql_command, [name, email])
        return redirect("/")

Here is the index.html for displaying the data:

<!DOCTYPE html>

<html lang="en">
    <head>
        <title>Registrants</title>
    </head>
    <body>
        <h1>List of all registrants</h1>
        <ul>
            {% for row in rows %}
                <li>{{ row["name"] }} ({{ row["email"] }})</li>
            {% endfor %}
        </ul>
        <a href="/register">Register here.</a>
    </body>
</html>

And the register.html file with the form:

<!DOCTYPE html>

<html lang="en">
    <head>
        <title>Register</title>
    </head>
    <body>
        <h1>Register for the lecture</h1>
        <form action="/register" method="post">
            <input type="text" name="name" placeholder="Name">
            <input type="text" name="email" placeholder="Email address">
            <input type="submit">
        </form>

    </body>
</html>

The http status seems normal:

  "GET / HTTP/1.0" 200 -
  "GET /register HTTP/1.0" 200 -
  "POST /register HTTP/1.0" 302 -
  "GET / HTTP/1.0" 200 -
  "GET / HTTP/1.0" 200

Thanks for your attention in advance! Any remarks are welcomed.

Upvotes: 0

Views: 258

Answers (1)

JBLaf
JBLaf

Reputation: 828

You forgot to commit() after :

sql_command = "INSERT INTO registrants (name, email) VALUES (?, ?);"
db.execute(sql_command, [name, email])

https://docs.python.org/3.8/library/sqlite3.html

Upvotes: 1

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