Question

I’m trying to import a .sql dump from disk into MySQL via Python and subprocess. I.e. the equivalent to

mysql -u user -ppassword db < dump.sql

My Python code looks like this (but I have tried a ton of alternatives :)):

proc = subprocess.Popen(
    ("mysql -u %s -p%s database"  % (MYSQL_USER, MYSQL_PASSWORD)).split(),
    stdin=subprocess.PIPE,
    stdout=subprocess.PIPE,
    shell=False)
out, err = proc.communicate('source /tmp/dump.sql')

The application finishes successfully, but there are no rows imported to MySQL. I have also tried pipe the dump.sql like this:

proc = subprocess.Popen(
    ("mysql -u %s -p%s database < /tmp/dump.sql"  % (MYSQL_USER, MYSQL_PASSWORD)).split(),
    stdin=subprocess.PIPE,
    stdout=subprocess.PIPE,
    shell=False)
out, err = proc.communicate()

If important, when I set shell=True I get ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO))

Can anyone please point me in the right direction?

Answer 1

You are using Popen.communicate() wrong.

import subprocess

proc = subprocess.Popen(["mysql", "--user=%s" % USER, "--password=%s" % PASS, "database"],
                        stdin=subprocess.PIPE,
                        stdout=subprocess.PIPE)
out, err = proc.communicate(file("/tmp/dump.sql").read())