Can I use DAO in controller?

Can I use DAO in controller?

If we want to based on the simplicity of the calling, yes – you can make the controller to directly call DAO ( Controller have DAO ). But, the getActiveUserByCountry which is a complex function still need to implemented in A Service Layer, which also have a DAO.

Is DAO model or controller?

Model-View-Controller usually means “user interface”. The Controller is a server side component (for web apps) that accepts requests from View clients, updates the Model appropriately, and sends results back to any and all View clients that need it. Service/DAO extends those layers to the server side.

How is controller DAO and service layer connected?

Service layer provides code modularity,the business logic and rules are specified in the service layer which in turn calls DAO layer ,the DAO layer is then only responsible for interacting with DB.

Is DAO part of MVC?

DAO is an abbreviation for Data Access Object, so it should encapsulate the logic for retrieving, saving and updating data in your data storage (a database, a file-system, whatever). The DTO/DAO would be your model in the MVC pattern.

Is DAO a model?

Data Access Object Pattern or DAO pattern is used to separate low level data accessing API or operations from high level business services. Model Object or Value Object – This object is simple POJO containing get/set methods to store data retrieved using DAO class.

Why do we need DAO layer?

Data Access Object Pattern or DAO pattern is used to separate low level data accessing API or operations from high level business services. This class is responsible to get data from a data source which can be database / xml or any other storage mechanism.

Is DAO still used?

The DAO manages the connection with the data source to obtain and store data. In this case, and whatever the query strategy used (JPA-QL or Criteria), I don’t think it would be wise to use such code directly in the business layer and the DAO still has uses.

What is the difference between DAO and repository?

DAO is an abstraction of data persistence. However, a repository is an abstraction of a collection of objects. DAO works as a data mapping/access layer, hiding ugly queries. However, a repository is a layer between domains and data access layers, hiding the complexity of collating data and preparing a domain object.

Is DAO a design pattern?

The Data Access Object (DAO) pattern is a structural pattern that allows us to isolate the application/business layer from the persistence layer (usually a relational database, but it could be any other persistence mechanism) using an abstract API.

What’s the difference between a dao and a service?

The DAO layer’s main goal is to handle the details of the persistence mechanism. While the service layer stands on top of it to handle business requirements. Notice that the DAO interface will be referenced from the service: Here, the service is a named component.

Why do I disagree with generic DAO design?

I disagree with Generic DAO design, reason of it is : You design generic dao with to generic type T, K, T for entity type and K for entity id. Now I say: What happen with this design if in a part of application we have an entity with two key as primary key (We have this allow in ORM)

Which is the correct DAO implementation for MongoDB?

This is my first go at implementing the DAO pattern – let alone implementing it for MongoDB with Morphia – I was hoping someone could point out smells and answer questions from my below implementation. My implementation of GenericDAO for MongoDB extends Morphia’s BasicDAO – does this seem like the correct placement for this extension?

Are there any generic Daos written in Java?

Here’s a github link if someone wants to see there. There are four DAOs – DAODelete, DAOUpdate, DAORead, DAOInsert but I am just putting DAORead and its implementation here so that it is easier to review. I have trimmed the code a lot so if something is amiss please tell me and I’ll correct it.