Log flask implementation ideas:
front-end to create forms, post method, userno, pwd parameters
Back-end first create a login validation function check (validation function refers to the front to get the userno, pwd by request.get. Then the two values as an argument to check validation function), how to verify the background of userno input and pwd are correct it ?
Then they would be verified through a database query, so join query in check function, and and_, verify whether the match is successful) successful then redirected to another page or this page.