MySQL rows delete when program exits

问题

I'm using Python and MySQLdb to add rows to my database. It seems that when my script exits, the rows get deleted. My last lines before the script exits do a "select *" on the table, which shows my one row. When I re-run the script, the first lines (after opening the connection) do the same "select *" and return zero results. I'm really at a loss here. I've been working for about 2 hours on this, and can't understand what could be accessing my database.

Also, between running the scripts, I run the "select *" manually from a terminal with zero results.

If I manually add a row from the terminal, it seems to last.

The query to insert the row:

cursor.execute("INSERT INTO sessions(username, id, ip) VALUES (%s, %s, %s)", (username, SessionID, IP]))

The query I use to check the data:

cursor.execute("select * from sessions")
print cursor.fetchall()

This shows the row before the program exits, then shows nothing when the program is run again.

Thanks in advance for all the help.

回答1:

Looks like you need to cursor.commit() your changes after you execute the query.

http://docs.python.org/library/sqlite3.html

Connection.commit(): This method commits the current transaction. If you don’t call this method, anything you did since the last call to commit() is not visible from other database connections. If you wonder why you don’t see the data you’ve written to the database, please check you didn’t forget to call this method.

回答2:

Check this other question: Python MySQLdb update query fails

You can find some examples on how to commit, how to connect using autocommit, etc.

来源：https://stackoverflow.com/questions/11785526/mysql-rows-delete-when-program-exits