What if I don't close the database connection in Python SQLite

Question

I am doing something like this...

conn = sqlite3.connect(db_filename)

with conn:
    cur = conn.cursor()
    cur.execute( ... )

with

Answer 1

You can use a with block like this:

from contextlib import closing
import sqlite3

def query(self, db_name, sql):
    with closing(sqlite3.connect(db_name)) as con, con,  \
            closing(con.cursor()) as cur:
        cur.execute(sql)
        return cur.fetchall()

• connects
• starts a transaction
• creates a db cursor
• preforms the operation and returns the results
• closes the cursor
• commits/rolls-back the transaction
• closes the connection

all safe in both happy and exceptional cases