studentmanager | Based on springboot+mybatis student management system | Object-Relational Mapping library

The configuration is missing AddControllers and MapControllerRoute calls. Checkout the example below:

you should define String ChoosedStudent = ""; as global variable.
Please try putting it right under class _MyAppState extends State {

You’re attempting to query on a row that doesn’t exist in the database. Also, Django ORM doesn’t recognize a property as a field to register.

The direct answer to your question would be to create annotations, which could be subsequently queried off of. However, I would reconsider your table design for Student as it introduces unnecessary complexity and maintenance overhead.

There’s much more framework/db support for start date, end date idiosyncrasy than there is start date, timedelta.

Instead of storing duration, store end_date and calculate duration in a model method. This makes more not only makes more sense as students are generally provided a start date and estimated graduation date rather than duration, but also because it’ll make queries like these much easier.

Querying which students are graduating in 2020.

It is not a nested class. It is a public instance method accepting a studentID parameter as a String that returns a Student and might throw a StudentNotFoundException.

This really took me a while to get my head around hehe.

You can make something like this