im working through alan's sql tutorial. i have a few questions from there but
1st i wanted to try out an example in Core python's sql example.
>>> import sqlite3
>>> cxn = sqlite3.connect('sqlite_test/test')
>>> cur = cxn.cursor()
after this i created a table called users and inserted some data. then i did:
>>> cur.execute('SELECT * from users')
>>> for user in cur.fetchall():
print(user)
i got the results of all data i gave the table. then did
>>> cur.close()
>>> cxn.commit()
>>> cxn.close()
i then closed this interactive IDLE session. i reopened another session and
simply did
>>> import sqlite3
>>> cxn = sqlite3.connect('sqlite_test/test')
>>> cur = cxn.cursor()
>>> for user in cur.fetchall():
print(user)
>>>
but this time no data was printed back to me, even though the database file
'test' already existed from the previous session. Why did this happen, cant i
just connect and my data is still intact? or do i have to always re enter data
from the previously saved session?
My questions about http://www.alan-g.me.uk/tutor/tutdbms.htm is to open a
database it uses the command line directly and doesnt creat cursor() or
connect() objects e.g.
E:\PROJECTS\SQL> sqlite3 employee.db
sqlite> create table Employee
...> (EmpID,Name,HireDate,Grade,ManagerID);
sqlite> insert into Employee (EmpID, Name, HireDate, Grade, ManagerID)
...> values ('1020304','John Brown','20030623','Foreman','1020311');
i tried this in my command line but got :
python.exe: can't open file 'sqlite': [Errno 2] No
such file or directory
i tried creating the a folder called test and doing: test employee.db
but no test.db was created.
my main questions are it possible to use the command line without cursor() and
connect() in python 3 or is it only for python 2. is it better from the command
line or in a .py file. And also my previous question i had about having to re
enter previously stored data
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