backend.py

import sqlite3
class db:
    def __init__(self):
        self.conn = sqlite3.connect("books.db")
        self.cur = self.conn.cursor()
        self.cur.execute("CREATE TABLE IF NOT EXISTS book (id INTEGER PRIMARY KEY, title TEXT, author TEXT, year INTEGER, isbn INTEGER)")
        self.conn.commit()

    def insert(self,title, author, year, isbn):

        self.cur.execute("INSERT INTO book VALUES(NULL,?,?,?,?)", (title,author,year,isbn))
        self.conn.commit()


    def view(self):
        self.cur.execute("SELECT * FROM book")
        rows = self.cur.fetchall()
        return rows

    def search(self,title="", author="", year="", isbn=""):
        self.cur.execute("SELECT * FROM book WHERE title = ? OR author = ? OR year = ? OR isbn = ?", (title, author, year, isbn))
        rows = self.cur.fetchall()
        return rows

    #destructor
    def __del__(self):
        self.conn.close()