Create the DAO Layer

What is a DAO layer in Java?

• a) A layer that separates client interface from data access mechanisms.
• b) A layer that adapts access APIs to a generic client interface.
• c) A layer that handles business logic and persistence operations in Java.
• d) A layer that provides data transfer between different layers of an application.

How to DAO in Java?

• a) By dividing high-level business services from low-level data accessing APIs or actions.
• b) By implementing a DAO interface for common operations on model objects.
• c) By using a data transfer object to store and transfer data between layers.
• d) By encapsulating the details of the persistence layer and providing a CRUD interface.

Which layer for DAO?

• a) Business layer.
• b) Presentation layer.
• c) Persistence layer.
• d) Service layer.

Is DAO and POJO same?

• a) Yes, both are used to handle data access and modification.
• b) No, DAO is a facade for database access while POJO is a simple Java object.
• c) Yes, both provide a generic interface for client interactions.
• d) No, DAO is a lower-level concept compared to POJO.

What is an example of a DAO?

• a) DASH, a cryptocurrency managed by users.
• b) Augur, a prediction market platform.
• c) Steemit, a social media platform.
• d) MakerDAO, a software that maintains a stablecoin.

Is DAO and repository same?

• a) Yes, both are used for data persistence.
• b) No, DAO is a lower-level concept compared to a repository.
• c) Yes, both provide an abstraction for collection of objects.
• d) No, DAO is closer to storage systems while a repository is closer to domain objects.

What is DAO and DTO in Java?

• a) DAO is a bridge between the application and the database, while DTO stores and transfers data.
• b) DAO is responsible for encapsulating persistence layer details, while DTO handles CRUD operations.
• c) DAO is used for object relational mapping, while DTO is used for data persistence.
• d) DAO acts as a data store, while DTO acts as a bridge between layers.

What is DAO in JPA?

• a) DAO is an abstract API for accessing relational databases.
• b) DAO is a persistence layer implementation in JPA.
• c) DAO allows isolation of the application/business layer from the persistence layer.
• d) DAO is a pattern used for object relational mapping.

How is a DAO structure?

• a) DAO is a centralized entity structure with a central authority.
• b) DAO is a bottom-up entity structure without a central authority.
• c) DAO is a top-down entity structure with multiple authorities.
• d) DAO is a distributed entity structure with equal authorities.

What is DAO in Java Spring Boot?

• a) DAO is a layer responsible for handling business logic in Java Spring Boot.
• b) DAO is a framework for creating decentralized autonomous organizations in Java Spring Boot.
• c) DAO is a data access object providing a CRUD interface for a single entity in Java Spring Boot.
• d) DAO is a design pattern used for dependency injection in Java Spring Boot.