Python sqlite3.OperationalError: no such table:
Question:
I am trying to store data about pupils at a school. I’ve done a few tables before, such as one for passwords and Teachers which I will later bring together in one program.
I have pretty much copied the create table function from one of these and changed the values to for the Pupil’s information. It works fine on the other programs but I keep getting:
sqlite3.OperationalError: no such table: PupilPremiumTable
when I try to add a pupil to the table, it occurs on the line:
cursor.execute("select MAX(RecordID) from PupilPremiumTable")
I look in the folder and there is a file called PupilPremiumTable.db and the table has already been created before, so I don’t know why it isn’t working.
Here is some of my code, if you need more feel free to tell me so, as I said it worked before so I have no clue why it isn’t working or even what isn’t working:
with sqlite3.connect("PupilPremiumTable.db") as db:
cursor = db.cursor()
cursor.execute("select MAX(RecordID) from PupilPremiumTable")
Value = cursor.fetchone()
Value = str('.'.join(str(x) for x in Value))
if Value == "None":
Value = int(0)
else:
Value = int('.'.join(str(x) for x in Value))
if Value == 'None,':
Value = 0
TeacherID = Value + 1
print("This RecordID is: ",RecordID)
Answers:
You are assuming that the current working directory is the same as the directory your script lives in. It is not an assumption you can make. Your script is opening a new database in a different directory, one that is empty.
Use an absolute path for your database file. You can base it on the absolute path of your script:
import os.path
BASE_DIR = os.path.dirname(os.path.abspath(__file__))
db_path = os.path.join(BASE_DIR, "PupilPremiumTable.db")
with sqlite3.connect(db_path) as db:
You can verify what the current working directory is with os.getcwd() if you want to figure out where instead you are opening the new database file; you probably want to clean up the extra file you created there.
I have to face same issue and there are a couple of approaches, but the one I think is the most probable one.
Maybe you are loading views or queries to database but you haven´t granted enough time for Django to migrate the models to DB. That’s why the “table doesn’t exist”.
Make sure you use this sort of initialization in you view’s code:
form RegisterForm(forms.Form):
def __init__(self, *args, **kwargs):
super(RegisterForm, self).__init__(*args, **kwargs)
A second approach is you clean previous migrations, delete the database and start over the migration process.
First, you need to check if that table 100% exist in the database. You can use sqlite viewer for that: https://inloop.github.io/sqlite-viewer/.
If the table exists, then you can write your table name in '', for example:
Select * from 'TableName'
Whatever your query is, I am just using Select * as an example.
I had the same problem and here’s how I solved it.
- I killed the server by pressing Ctrl+C
- I deleted the pychache folder. You’ll find this folder in your project folder.
- I deleted the sqlite db.
- I made migrations with
python manage.py makemigrations <app_name> where <app_name> is the specific app that contains the model that’s causing the error. In my case it was the mail app so I ran python manage.py makemigrations app.
- I migrated in the normal way.
- Then I started the server and it was all solved.
I believe the issue is as Jorge Cardenas said:
Maybe you are loading views or queries to database but you haven´t
granted enough time for Django to migrate the models to DB. That’s why
the "table doesn’t exist".
This solution is based on this youtube video
I had the same issue when I was following the flask blog tutorial. I had initialized the database one time when it started giving me the sqlite3.OperationalError: then I tried to initialize again and turns out I had lots of errors in my schema and db.py file. Fixed them and initialized again and it worked.
Adding this worked for me:
import os.path
BASE_DIR = os.path.dirname(os.path.abspath(__file__))
db_dir = (BASE_DIR + '\PupilPremiumTable.db')
Note the need for \ before PupilPremiumTable.bd for the code to work .
I am trying to store data about pupils at a school. I’ve done a few tables before, such as one for passwords and Teachers which I will later bring together in one program.
I have pretty much copied the create table function from one of these and changed the values to for the Pupil’s information. It works fine on the other programs but I keep getting:
sqlite3.OperationalError: no such table: PupilPremiumTable
when I try to add a pupil to the table, it occurs on the line:
cursor.execute("select MAX(RecordID) from PupilPremiumTable")
I look in the folder and there is a file called PupilPremiumTable.db and the table has already been created before, so I don’t know why it isn’t working.
Here is some of my code, if you need more feel free to tell me so, as I said it worked before so I have no clue why it isn’t working or even what isn’t working:
with sqlite3.connect("PupilPremiumTable.db") as db:
cursor = db.cursor()
cursor.execute("select MAX(RecordID) from PupilPremiumTable")
Value = cursor.fetchone()
Value = str('.'.join(str(x) for x in Value))
if Value == "None":
Value = int(0)
else:
Value = int('.'.join(str(x) for x in Value))
if Value == 'None,':
Value = 0
TeacherID = Value + 1
print("This RecordID is: ",RecordID)
You are assuming that the current working directory is the same as the directory your script lives in. It is not an assumption you can make. Your script is opening a new database in a different directory, one that is empty.
Use an absolute path for your database file. You can base it on the absolute path of your script:
import os.path
BASE_DIR = os.path.dirname(os.path.abspath(__file__))
db_path = os.path.join(BASE_DIR, "PupilPremiumTable.db")
with sqlite3.connect(db_path) as db:
You can verify what the current working directory is with os.getcwd() if you want to figure out where instead you are opening the new database file; you probably want to clean up the extra file you created there.
I have to face same issue and there are a couple of approaches, but the one I think is the most probable one.
Maybe you are loading views or queries to database but you haven´t granted enough time for Django to migrate the models to DB. That’s why the “table doesn’t exist”.
Make sure you use this sort of initialization in you view’s code:
form RegisterForm(forms.Form):
def __init__(self, *args, **kwargs):
super(RegisterForm, self).__init__(*args, **kwargs)
A second approach is you clean previous migrations, delete the database and start over the migration process.
First, you need to check if that table 100% exist in the database. You can use sqlite viewer for that: https://inloop.github.io/sqlite-viewer/.
If the table exists, then you can write your table name in '', for example:
Select * from 'TableName'
Whatever your query is, I am just using Select * as an example.
I had the same problem and here’s how I solved it.
- I killed the server by pressing Ctrl+C
- I deleted the pychache folder. You’ll find this folder in your project folder.
- I deleted the sqlite db.
- I made migrations with
python manage.py makemigrations <app_name>where <app_name> is the specific app that contains the model that’s causing the error. In my case it was the mail app so I ran python manage.py makemigrations app. - I migrated in the normal way.
- Then I started the server and it was all solved.
I believe the issue is as Jorge Cardenas said:
Maybe you are loading views or queries to database but you haven´t
granted enough time for Django to migrate the models to DB. That’s why
the "table doesn’t exist".
This solution is based on this youtube video
I had the same issue when I was following the flask blog tutorial. I had initialized the database one time when it started giving me the sqlite3.OperationalError: then I tried to initialize again and turns out I had lots of errors in my schema and db.py file. Fixed them and initialized again and it worked.
Adding this worked for me:
import os.path
BASE_DIR = os.path.dirname(os.path.abspath(__file__))
db_dir = (BASE_DIR + '\PupilPremiumTable.db')
Note the need for \ before PupilPremiumTable.bd for the code to work .