db_ctrl.py

import sqlite3
import sys

if len(sys.argv) < 3:
    print("Usage: %s [init|insert|list] db" % sys.argv[0])
else:
    conn = sqlite3.connect(sys.argv[2])
    with conn:
        if sys.argv[1] == "init":
            conn.execute("DROP TABLE IF EXISTS records")
            conn.execute("CREATE TABLE records(id INTEGER PRIMARY KEY AUTOINCREMENT, description TEXT)")
            conn.commit()
        elif sys.argv[1] == "list":
            cursor = conn.cursor()
            cursor.execute("SELECT * FROM records")
            rows = cursor.fetchall()
            for r in rows:
                print(r)
        elif sys.argv[1] == "insert":
            while True:
                line = sys.stdin.readline()
                if not line:
                    break
                conn.execute("INSERT INTO records(description) VALUES (?)", (line.rstrip(),))
            conn.commit()
        else:
            print("Unrecognised command: %s" % sys.argv[1])