Question

我正在学习Flask框架。如何使用带有mysql的Flask（没有sqlalchemy - raw sql查询）？

以下是官方教程中的示例，如何配置它以使用mysql？

from sqlite3 import dbapi2 as sqlite3
from flask import Flask, request, session, g, redirect, url_for, abort, render_template, flash


# create our little application :)
app = Flask(__name__)

# Load default config and override config from an environment variable
app.config.update(dict(
    DATABASE='/tmp/firma.db',
    DEBUG=True,
    SECRET_KEY='development key',
    USERNAME='admin',
    PASSWORD='default'
))
app.config.from_envvar('FIRMA_SETTINGS', silent=True)


def connect_db():
    """Connects to the specific database."""
    rv = sqlite3.connect(app.config['DATABASE'])
    rv.row_factory = sqlite3.Row
    return rv


def init_db():
    """Creates the database tables."""
    with app.app_context():
        db = get_db()
        with app.open_resource('firma.sql', mode='r') as f:
            db.cursor().executescript(f.read())
        db.commit()


def get_db():
    """Opens a new database connection if there is none yet for the
    current application context.
    """
    if not hasattr(g, 'sqlite_db'):
        g.sqlite_db = connect_db()
    return g.sqlite_db


@app.teardown_appcontext
def close_db(error):
    """Closes the database again at the end of the request."""
    if hasattr(g, 'sqlite_db'):
        g.sqlite_db.close()


@app.route('/')
def show_entries():
    db = get_db()
    cur = db.execute('select title, text from entries order by id desc')
    entries = cur.fetchall()
    return render_template('show_entries.html', entries=entries)
...

如何配置它以使用mysql？

Answer 1

你需要一个mysql驱动程序。默认情况下，Python不附带一个。您必须安装第三方库，如MySQLdb。即使你使用像sqlalchemy这样的ORM，你仍然需要安装驱动程序。此外，您可以使用sqlalchemy运行原始SQL。

如何使用带有mysql的Flask（没有sqlalchemy - raw sql查询）？

1 个答案: