Explain the concept of \'Database First\' or \'Code First\'. update The final ex

Question

Explain the concept of 'Database First' or 'Code First'. update The final exam coding project consists of five projects RocketDAL, RocketBALL, RocketJabber, RocketServer, RocketClient). What is this programming approach named? Why do we use it? A LinkedBlockingQueue, (LBQ) is a bounded queue and a priorityblockingQueue (PBQ) is an unbounded queue? What's the difference? What's the difference between an java, util ArrayList, and java, util, vector? What is the purpose of the @FXML notation in a JavaFX controller file? Is it required? Consider the following method in a JavaFX controller file: @FXML public void btnCalculatePayment(ActionEvent event) This is the method called by pressing the button 'Calculate'. Why do we pass in 'ActionEvent'? What was the purpose of adding the following dependency in RocketBLL? What does Maven do when it sees this dependency? org.apache.poi poi 3.12

Explanation / Answer

Database first:

->databae first is Very popular if you have DataBase designed by DBAs, developed separately or if you have existing Database

->The Database First Approach provides an alternative to the Code First and Model First approaches to the Entity Data Model.

->It creates model codes (classes, properties, DbContext etc.) from the database in the project and those classes become the link between the database and controller.

->in this Database and tables are created first.

->After that only create entity Data Model using the created database.

>Manual changes to the database are possible because the database defines your domain model. You can always update model from database.

->it is simple to create the data model

->in database first When you need to add any functionality to generated model you have to extend the model class generated.

Code first:

->Entity Framework introduced Code-First approach from Entity Framework 4.1. Code-First is mainly useful in Domain Driven Design. With the Code-First approach, you can focus on the domain design and start creating classes as per your domain requirement rather than design your database first and then create the classes which match your database design. Code-First APIs will create the database on the fly based on your entity classes and configuration.

->Very popular because hardcore programmers don't like any kind of designers and defining mapping in EDMX xml is too complex.

->Full control over the code.

-> In code first approach we will first create entity classes with properties defined in it. Entity framework will create the database and tables based on the entity classes defined. So database is generated from the code.

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