# Python SQLite API
# sqlite3 ó DB-API 2.0 interface for SQLite databases
# SQLite is a C library that provides a lightweight disk-based database that doesnít require a separate server process and allows
# accessing the database using a nonstandard variant of the SQL query language.
# Some applications can use SQLite for internal data storage.
# Itís also possible to prototype an application using SQLite and then port the code to a larger database such as PostgreSQL or Oracle.
# The sqlite3 module provides a SQL interface compliant with the DB-API 2.0 specification described by PEP 249.
# Registering an adapter callable.
# The other possibility is to create a function that converts the type to the string representation and register the function with register_adapter().
 
import sqlite3

class Point:

    def __init__(self, x, y):
        self.x, self.y = x, y

def adapt_point(point):
    return "%f;%f" % (point.x, point.y)

sqlite3.register_adapter(Point, adapt_point)

con = sqlite3.connect(":memory:")

cur = con.cursor()

p = Point(4.0, -3.2)

cur.execute("select ?", (p,))

print(cur.fetchone()[0])
