This is a port of the excellent django-debug-toolbar for Flask applications.

The SQLAlchemy Panel is depand on Flask-SQLAlchemy(mostly the get_debug_queries function). Flask-SQLAlchemy uses SQLAlchemy's ConnectionProxy and it's already been deprecated. It becomes complicated to fix that panel. Since I only need simple debug info and most of my database query happend in APIs(that's why I've added the debug data into json response), I'm going to implement it without Debug-toolbar, using SQLAlchemy's new ConnectionEvents.

SQLAlchemy的调试功能需要项目数据交互使用Flask-SQLAlchemy插件，Flask-SQLAlchemy提供了一个 get_debug_queries 方法获取数据库的请求时间等数据，但SQLAlchemy现在已经不支持插件中使用的 ConnectionProxy 方式了，所以要修复这个SQLAlchemy的调试功能变得较为的麻烦。考虑到现在项目的数据库操作大多发生在API接口中，我决定用SQLAlchemy的 ConnectionEvents 在项目中直接实现数据库的调试功能。

Installing is simple with pip:

$ pip install flask-debugtoolbar

Setting up the debug toolbar is simple:

from flask import Flask
from flask_debugtoolbar import DebugToolbarExtension

app = Flask(__name__)

# the toolbar is only enabled in debug mode:
app.debug = True

# set a 'SECRET_KEY' to enable the Flask session cookies
app.config['SECRET_KEY'] = '<replace with a secret key>'

toolbar = DebugToolbarExtension(app)

The toolbar will automatically be injected into Jinja templates when debug mode is on. In production, setting app.debug = False will disable the toolbar.

See the documentation for more information.