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PyMongo 和 Flask-PyMongo 库之间的区别

[英]Difference between PyMongo and Flask-PyMongo libraries

原文 2015-07-31 14:04:18 3 1 python/ mongodb/ flask

I'm new to PyMongo and Flask, I have completed the tutorial for flask though and feel rather comfortable with it.我是 PyMongo 和 Flask 的新手，不过我已经完成了 Flask 的教程，并且对它感到很舒服。 I am now trying to implement a flask server with MongoDb and I'm not sure how to progress.我现在正在尝试使用 MongoDb 实现一个 Flask 服务器，但我不确定如何进行。

I see there are two libraries, PyMongo and Flask-PyMongo.我看到有两个库，PyMongo 和 Flask-PyMongo。 It's isn't clear to me which I should use, or if I need to use both.我不清楚应该使用哪个，或者我是否需要同时使用两者。 How they interoperate and such...它们如何互操作等等......

First, i'm trying to connect to a mongodb, I have that running in the background and I can see connections whenever I start up my flask server, so that must be working.首先，我正在尝试连接到一个 mongodb，我在后台运行它，每当我启动我的 Flask 服务器时我都可以看到连接，所以它必须工作。 PyMongo offers methods to connect to specific database using db = client['test-database'] . PyMongo 提供了使用db = client['test-database']连接到特定数据库的方法。 Flask-pymongo seems to just give a db connection from nowhere when using mongo = PyMongo(app) then mongo.db for access to the db.当使用mongo = PyMongo(app)然后使用mongo.db访问数据库时，Flask-pymongo 似乎只是从无处提供数据库连接。

Being new to mongo as well this is all confusing for me, I was hoping someone would be able to give me a clear answer to all my questions, searches around the web don't reveal many results for flask-pymongo library.作为 mongo 的新手，这对我来说很困惑，我希望有人能够给我一个明确的答案来回答我的所有问题，网上搜索并没有显示出很多flask-pymongo 库的结果。

I did have a look at this question: What is the relationship between flask, mongokit, pymongo, flask-pymongo?我确实看过这个问题： flask、mongokit、pymongo、flask-pymongo 之间的关系是什么？ , but it did not clear anything up for me. ，但它并没有为我清除任何东西。

1 个解决方案

The main difference is that flask-pymongo is a wrapper of pymongo ready to work on flask's application environment.主要区别在于flask-pymongo 是pymongo 的包装器，可以在flask 的应用程序环境中工作。

You can configure the database connection within flask application config object.您可以在 Flask 应用程序配置对象中配置数据库连接。

Flask-pymongo also implements helper methods on top of pymongo.. Flask-pymongo 还在 pymongo 之上实现了辅助方法。

For example: pymongo have find() method, while flask-pymongo have an extension named find_or_404() which raise a not found exception if the item does not exist, and so on..例如：pymongo 有find()方法，而flask-pymongo 有一个名为find_or_404()的扩展名，如果该项目不存在，则会引发未找到异常，依此类推。