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What are the database connections in Python Flask, explain?

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Database powered applications are supported by flask. The relational database systems need to create a schema that requires piping the schema.sql file into a SQLite3 command. So, in this case you need to install SQLite3 command on your system to initiate and create the database in the flask.

We can request a database using flask in three ways, and they are:

before_request(): Using this we can request database before only without passing arguments.

after_request(): This method is called after requesting the database and also send the response to client.

teardown_request(): This method is called in the cases where the responses are not guaranteed and the exception is raised. They have no access to modify the request.

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