A database-driven application is supported by Flask (RDBS). A system like this necessitates the creation of a schema, which necessitates feeding the schema.sql file into the sqlite3 command. To create or start a database in Flask, Python developers must install the sqlite3 command.
Flask allows to request for a database in three ways:
- before_request(): They are called before a request and pass no arguments.
- after_request(): They are called after a request and pass the response that will be sent to the client.
- teardown_request(): They are called in a situation when an exception is raised and responses are not guaranteed. They are called after the response has been constructed. They are not allowed to modify the request, and their values are ignored.