如何将我的flask应用程序连接到SQLite3数据库？

from flask import Flask, g
import sqlite3

app = Flask(__name__)

app.config['DATABASE'] = '/path/to/database.db'

def get_db():
    db = getattr(g, '_database', None)
    if db is None:
        db = g._database = sqlite3.connect(app.config['DATABASE'])
    return db

@app.before_request
def before_request():
    g.db = get_db()

@app.teardown_request
def teardown_request(exception):
    db = getattr(g, '_database', None)
    if db is not None:
        db.close()

@app.route('/query')
def query():
    cursor = g.db.cursor()
    cursor.execute("SELECT * FROM table_name")
    result = cursor.fetchall()
    cursor.close()
    return str(result)