Question

I am trying to fetch one value from a database using pymysql. My current solution is 3 lines of code. Is this the best way to handle this?

import pymysql

conn = pymysql.connect(host='localhost', user='root', passwd='')
conn.autocommit(True)
cur = conn.cursor()

memory = '100'

# I want to access one item from mySQL
cur.execute("""SELECT id FROM scada.sensors WHERE memory='{}'""".format(memory))
for x in cur.fetchall(): # only runs once
   sensor_id=x[0]

Do I need this for loop to access the contents of cur.fetchall()?

I am using Python 3.2.3

Answer 1

If you are only interested in one value (or the first value), you can just use the fetchone method in place of fetchall. Here’s an example from the docs for MySQLdb (pymysql says it copies the entire MySQLdb API).