On 03/06/2013 03:47 PM, Joel Goldstick wrote:
On Wed, Mar 6, 2013 at 1:50 PM, Lolo Lolo <losermelo...@yahoo.com> wrote:
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've only used sqlite and Python together a couple of times but I don't
remember seeing that sequence of commands used. Don't use cur.close()
and see if that helps.
Regards, Jim
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?
Are you sure you are in same directory each time?
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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