Glauco said:
best way is to create a connection ar the start of one session work. use
this connection to do an entire transaction. At the end of work you must
commit or rollback. But this don't mean that you can misc select and
insert on tha same cursor.
con = MySql.connection....
cur1 = con.cursor()
cur1.execute("select.....
for rec in cur1:
do something
cur2 = con.cursor()
cur2.execute("insert ....
conn.commit or rollback
conn.close()
In this stupid example you CANNOT use only cur1 !!
Is not necessary to close cursors , last line do this for you
Bye
Glauco
You don't need to close the connection. By issuing a commit or a
rollback you are finishing the transaction (if you have transaction
aware tables, e.g. InnoDB). The point that Glauco is making is that you
can't use one cursor for two operations simultaneously.
Following his example, if you try and do;
row.b, row.c))
Then you will get an exception because the second execute will
obliterate the result set of the first - which you are trying to loop
through. Its perfectly possibly though, to do;
row.b, row.c))
Which is fine as long as the first select doesn't return too many rows ;-)
As a general rule of thumb establish a connection when your program
starts and close it when you finish. Oh, and don't create a new cursor
within a loop, that will not be very efficient.
Regards,
Andy
