Python-CSVReader and Database

I need to read some data form csv files and as it's i need to put in single mysql database table. I written very simple classes for reading data in dictonary format and sending data to mysql database.
I used two python modules
    1. csv
    2. MySQLdb

we can divide this task in two class one can handle the csv reader and another can handle database.
Now have look of first class

import csv
class myReader:
    def __init__(self, csvfile ):
        self.reader = csv.DictReader(open(csvfile, "rb"), delimiter = ",", skipinitialspace=True)
    def getRow(self):
        try:
            row = self.reader.next()
        except:
            row = None
        return row
    def __del__(self):
        print "Destorying myReader object"


after reading the row from csv file, we can directly pass to our table class which have create sql based on number of columns in row data, sometimes may be your row have less number of columns then table.

import MySQLdb
class csvTable:
    def __init__(self, db ):
        self.db = db

    def additem(self, item):
        cursor = self.db.cursor()
        vallist=''
        collist=''
        for key in item:
            if key=='':
             continue
            if vallist=='':
                vallist="%("+key+")s"
                collist = key
            else:
                vallist = vallist + "," + "%("+key+")s"
                collist = collist + "," + key
        sql = "INSERT INTO  csvDataTable ("+ collist + ") VALUES (" + vallist + ")"  
        cursor.execute(sql,item)
        cursor.close()
        return

    def savedata(self):
    '''
    commit the data in database
    '''
        self.db.commit()
        return

    def __del__(self):
        print "Destroying the csvTable object"

Now we need to write unittest function.

def processcsvfile(csvfile):
    print "inserting data of " + csvfile
    conn = MySQLdb.connect(host= "localhost",user="mysqluser",passwd="password",db="mydb")
    rd = myReader (csvfile)
    ct = csvTable(conn)
    rw = rd.getRow()
    i=0;
    while rw:
        try:
            ct.additem(rw)
        except:
            print "Unexpected error:", sys.exc_info()
        rw = rd.getRow()
        i=i+1
    print "Number of recored processed :" + str(i)
    ct.savedata()
    conn.close()