Rai Ammad Khan Rai Ammad Khan - 1 month ago 11
Python Question

OperationalError: no such table: entries

I am learning flask framework and was following the flask tutorial. I have followed every step of this tutorial line-by-line. In the end I am getting the error "sqlite3.OperationalError OperationalError: no such table: entries". I am on linux machine and have never used sqlite before. I dont know how to tackle this problem. And the code of flaskr.py is here below

# all the imports
import os
import sqlite3
from flask import Flask, request, session, g, redirect, url_for, abort, render_template, flash



# create our little application :)
app = Flask(__name__)
app.config.from_object(__name__)
# Load default config and override config from an environment variable
app.config.update(dict(
DATABASE=os.path.join(app.root_path, 'flaskr.db'),
DEBUG=True,
SECRET_KEY='development key',
USERNAME='admin',
PASSWORD='default'
))
app.config.from_envvar('FLASKR_SETTINGS', silent=True)


def connect_db():
# """Connects to the specific database."""
rv = sqlite3.connect(app.config['DATABASE'])
rv.row_factory = sqlite3.Row
return rv

def init_db():
with app.app_context():
db = get_db()
with app.open_resource('schema.sql', mode='r') as f:
db.cursor().executescript(f.read())
db.commit()


def get_db():
#"""Opens a new database connection if there is none yet for the current application context."""
if not hasattr(g, 'sqlite_db'):
g.sqlite_db = connect_db()
return g.sqlite_db


@app.teardown_appcontext
def close_db(error):
#"""Closes the database again at the end of the request."""
if hasattr(g, 'sqlite_db'):
g.sqlite_db.close()



@app.route('/')
def show_entries():
db = get_db()
cur = db.execute('select title, text from entries order by id desc')
entries = cur.fetchall()
return render_template('show_entries.html', entries=entries)



@app.route('/add', methods=['POST'])
def add_entry():
if not session.get('logged_in'):
abort(401)
db = get_db()
db.execute('insert into entries (title, text) values (?, ?)',
[request.form['title'], request.form['text']])
db.commit()
flash('New entry was successfully posted')
return redirect(url_for('show_entries'))



@app.route('/login', methods=['GET', 'POST'])
def login():
error = None
if request.method == 'POST':
if request.form['username'] != app.config['USERNAME']:
error = 'Invalid username'
elif request.form['password'] != app.config['PASSWORD']:
error = 'Invalid password'
else:
session['logged_in'] = True
flash('You were logged in')
return redirect(url_for('show_entries'))
return render_template('login.html', error=error)


@app.route('/logout')
def logout():
session.pop('logged_in', None)
flash('You were logged out')
return redirect(url_for('show_entries'))



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

Answer

I found the problem. I need to create the tables first before the execution of code. So I just opened the python shell and typed the following commands. This function created the required tables in my database.

 from flaskr import init_db
 init_db()
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