You can not communicate directly between Angular and MySQL. You'll need to build a back-end Web service that calls MySql using php or node. Angular can communicate with this back-end Web service via http.
A text box is an object you can add to your document that lets you put and type text anywhere in your file. Text boxes can be useful for drawing attention to specific text and can also be helpful when you need to move text around in your document.
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The following code is written in Java and creates all the classes as requested with their variables, and methods. Each extending to the Person class if needed. Due to technical difficulties I have attached the code as a txt file below, as well as a picture with the test output of calling the Staff class.