Elemettree logic issues

I have spent more time on this issue than I'd care to admit. The below code is working pulling data from XML using elementtree. I am then writing it to a Sqlite DB.

The problem I am getting is that my hosts table is creating multiple entries for the same host and I cant work out why. When printing the data (as in the code) the data seems to print correctly, so its baffling me.

Example of Data Output In DB

Code

#!/usr/local/bin/python

import elementtree.ElementTree as ET
import sqlite3
import os


def create_db():
    print 'Creating DB'
    db = sqlite3.connect('database.sqlite')
    cursor = db.cursor()
    cursor.execute('''drop table if exists hosts'''), cursor.execute('''drop table if exists vulns'''), cursor.execute('''drop table if exists cves''')

    db.commit()
    cursor.execute('''CREATE TABLE hosts(id INTEGER PRIMARY KEY, operating_system TEXT, host_ip TEXT, netbios_name TEXT)''')
    cursor.execute('''CREATE TABLE vulns(pluginID INTEGER, pluginName TEXT, severity INTEGER, description TEXT, host_id INTEGER PRIMARY KEY, FOREIGN KEY(host_id) REFERENCES hosts(id))''')
    cursor.execute('''CREATE TABLE cves(pluginID TEXT, cve TEXT, host_id INTEGER PRIMARY KEY, FOREIGN KEY(host_id) REFERENCES hosts(id))''')
    db.commit()
    db.close()


def delete_db():
    answer = raw_input("Would you like to delete the database?")
    if answer == "y":
        os.remove('database.sqlite')
    else:
        pass


def get_details(nessus_file):
    print "Getting Details"
    db = sqlite3.connect('database.sqlite')
    cursor = db.cursor()
    try:
        tree = ET.parse(nessus_file)
        for reporthost in tree.findall('/Report/ReportHost'):
            netbios_name = None
            operating_system = None
            for tag in reporthost.findall('.//HostProperties/tag'):
                if tag.get('name') == 'netbios-name':
                    netbios_name = tag.text
                elif tag.get('name') == 'operating-system':
                    operating_system = tag.text
                elif tag.get('name') == 'host-ip':
                    host = tag.text

                if netbios_name == None:
                    netbios_name = 'N/A'
                if operating_system == None:
                    operating_system = 'N/A'

            for item in reporthost.findall('ReportItem'):
                sev = item.get('severity')
                name = item.get('pluginName')
                description = item.findtext('description')
                pluginid = item.get('pluginID')
                print netbios_name
                print operating_system
                print host
                print name
                print sev
                print description
                print pluginid

                cursor.execute('INSERT INTO hosts(host_ip, netbios_name, operating_system) VALUES(?,?,?)', (host, netbios_name, operating_system,))
                cursor.execute('INSERT INTO vulns(pluginName, severity, description, pluginID) VALUES(?,?,?,?)', (name, sev, description, pluginid,))
                for cve in item.getiterator('cve'):
                    cursor.execute('INSERT INTO cves(cve, pluginID) VALUES(?,?)', (cve.text, pluginid,))
                db.commit()
        db.close()
    except Exception as e:
        print e
        exit()

create_db()
get_details('file.nessus')
delete_db()