from pydantic import BaseModel
from typing import List, ClassVar

class Person(BaseModel):
    id: int
    name: str

async def create(conn):
    await conn.execute('''
        CREATE TABLE IF NOT EXISTS Person (
            id INTEGER PRIMARY KEY,
            name TEXT UNIQUE
        );''')

async def get_by_id(conn, id: int) -> Person:
    cursor = await conn.execute('''
        SELECT id, name
        FROM Person
        WHERE id = ?
    ''', (id,))
    row = await cursor.fetchone()
    if not row:
        return None
    return Person(id=row[0], name=row[1])

async def get_all(conn) -> List[Person]:
    async with conn.execute('''
        SELECT id, name
        FROM Person
    ''') as cursor:
        async for row in cursor:
            yield Person(id=row[0], name=row[1])

async def insert(conn, person: Person) -> Person:
    cursor = await conn.execute('''
        INSERT INTO Person (name)
        VALUES (?)
    ''', (person.name,))
    person.id = cursor.lastrowid
    return person