connecting to database using sqlalchemy using DATABASE_URL

问题

I am comfortable in using SQL query languages and need to develop a web application. I am learning python -sqlachemy and stuck in get connected to postgressql database.

Please let me know: what are the libraries i need to install ? How do i Configure DATABASE_URL in flask.[enter image description here][1]

I am stuck with code line no-6. I need to know how to get DATABASE_URL configured? I am very new potgressql. [1]: https://i.stack.imgur.com/7oGRC.png

回答1:

You can set it up in bash or you can use dotenv package from pypi:

$ export DATABASE_URL=postgresql://username:password@host:port/dbname

If your username=blue, password=pass, host=localhost, and port=5432, dbname=testDB then:

$ export DATABASE_URL=postgresql://blue:pass@localhost:5432/testDB

To check if the postgres db is running-- or check the port on which it is running:

$ sudo lsof -i -n -P | grep LISTEN

来源：https://stackoverflow.com/questions/62768498/connecting-to-database-using-sqlalchemy-using-database-url