Database code for Python-based URL shortener

Question

I had implemented a URL shortener with Python and a database. Please review the database part of the code. The idea is to create an MD5 hash of the URL in question and then store it in a database. The hex digits of the MD5 hash is then encoded with a large base encoding i.e base 62 encoding or base 128 encoding to do away with the long length of the hash. The rest of the code can be found on https://github.com/hirok19/URLShortener.

import pysqlite3
import hashlib
class DatabaseConnector:
    cursor=None
    conn=None
    def __init__(self,path):
        try:
            self.conn = pysqlite3.connect(path)
            self.cursor=self.conn.cursor()
        except:
            print("Unable to initialize database")

    def createTable(self):
        try:
            self.cursor.execute("""CREATE TABLE IF NOT EXISTS urlTable (id,url)""")
        except Exception as e:
            print("Unable to create table")
            print(e)

    def insertURL(self,URL):
        key=self.getKey(URL)
        #print(type(key))
        insert_stmt = ("INSERT INTO urlTable (id,url) VALUES ('{0}','{1}');")
        statement=insert_stmt.format(key,URL)
        #print(statement)
        try:
            if(self.getURLFromKey(key) is None):
                self.cursor.execute(statement)
                self.conn.commit()
                print("Data inserted!")
            else:
                print("Data already present")
        except Exception as e:
            print("Unable to insert data")
            print(e)
            return None
        return key
    def getKey(self,URL):
        hashedKey=hashlib.md5(URL.encode()) 
        return hashedKey.hexdigest() 


    def getURLFromKey(self,key):
        insert_stmt=("SELECT url from urlTable where id='{0}';")
        statement=insert_stmt.format(key)
        #print(statement)
        try:
            self.cursor.execute(statement)
            rows = self.cursor.fetchall()
            if(len(rows)>0):
                return rows[0][0]
            else:
                return None


        except Exception as e:
            print("Unable to fetch URL")
            print(e)
            return None