python sqlite3 cannot receive two table's field in one function

I 've written two function for each table to receive field's command. And my teammate needs me to remix two function into one. Finally I make this function but it cannot receive my router table 's command.

This is my code:

def readciscodevice(x):
        conn = sqlite3.connect('server.db')
        cur = conn.cursor()
        if x:
                cur.execute(
                        "SELECT DISTINCT command FROM switch WHERE   function =? or function='configure terminal' or function='enable'  ORDER BY key ASC",
                        (x,))
                read = cur.fetchall()
                return read
        else:
                cur.execute(
                        "SELECT DISTINCT command FROM router WHERE   function =? or function='configure terminal' or function='enable'  ORDER BY key ASC",
                        (x,))
                read = cur.fetchall()
                return read;


a = raw_input("x:")
for result in readciscodevice(a):
        print(result[0])

I use my if-statement and it can read my switch table 's command but cannot get commands from switch table. Do I need to write boolean or something else to ensure that it can access my router table?