db.py

# http://flask.pocoo.org/docs/1.0/tutorial/database/
import sqlite3

import click
from flask import current_app, g
from flask.cli import with_appcontext

def get_db():
    if "db" not in g:
        g.db = sqlite3.connect(
            "sqlite_db", detect_types=sqlite3.PARSE_DECLTYPES
        )
        g.db.row_factory = sqlite3.Row

    return g.db

def close_db(e=None):
    db = g.pop("db", None)

    if db is not None:
        db.close()

def init_db():
    db = get_db()

    with current_app.open_resource("schema.sql") as f:
        db.executescript(f.read().decode("utf8"))

@click.command("init-db")
@with_appcontext
def init_db_command():
    """Clear the existing data and create new tables."""
    init_db()
    click.echo("Initialized the database.")

con = sqlite3.connect("sqlite_db")  
#print("Database opened successfully")  
#add user column?
#con.execute("drop table recordTraining ")
#print("ok")
#con.execute("create table registerTeam (team_name TEXT PRIMARYKEY, team_description TEXT NOT NULL, rink_location INTEGER NOT NULL, member_emails TEXT NOT NULL)")
  
#print("Table created successfully")  

def init_app(app):
    app.teardown_appcontext(close_db)
    app.cli.add_command(init_db_command)