Question

I’m running into some trouble running python/mysqldb on my raspberry pi. This is a pretty simple script, so I’m not sure what I’m missing. The “SELECT * FROM…” runs with no problem, but I can’t seem to update the table with new values. The script runs without throwing errors, but when I ctrl-C, it gives me this:

Exception _mysql_exceptions.ProgrammingError: (2014, “Commands out of sync; you can’t run this command now”) in bound method DictCursor.__del of MySQLdb.cursors.DictCursor object at 0x19dfd90

Here’s my script:

    dhost = "localhost"
    duser = "root"
    dname = "rpi"
    dpass = "datPassword"

    import MySQLdb

    try:
        con = MySQLdb.connect(dhost,duser,dpass,dname);
        cur = con.cursor(MySQLdb.cursors.DictCursor)

    except MySQLdb.Error, e:
        print "Error %d: %s" % (e.args[0],e.args[1])
        sys.exit(1)


    def websiteToSensor():
        cur.execute("SELECT * FROM homeauto WHERE changedby = 'website'")
        rows = cur.fetchall()
        for row in rows:
            cur.execute("UPDATE homeauto SET changedby = 'script' WHERE id = '%s'",(row["id"]))
        return

    while True:
        websiteToSensor()

Does anyone have an idea as to why my table isn’t updating? Thanks!

***EDIT: SOLUTION***

Thanks to Martijn Pieters, here’s my new websiteToSensor() code:

    def websiteToSensor():
        cur = con.cursor(MySQLdb.cursors.DictCursor)
        cur.execute("SELECT * FROM homeauto WHERE changedby = 'website'")
        rows = cur.fetchall()
        num = int(cur.rowcount)
        if num > 0:
            for row in rows:
                cur.execute("UPDATE homeauto SET changedby = 'script' WHERE id = '%s'",(row["id"]))
            con.commit()
            cur.close()
            con.commit()
        else:
            cur.close()
            con.commit()
        return

Answer 1

Try committing your changes:

def websiteToSensor():
    cur.execute("SELECT * FROM homeauto WHERE changedby = 'website'")
    rows = cur.fetchall()
    for row in rows:
        cur.execute("UPDATE homeauto SET changedby = 'script' WHERE id = '%s'",(row["id"]))
    con.commit()
    return