What is a DAO factory?
The DAO factory is responsible for determining how to create the DAO object. This may involve implementation-specific DAO factories responsible for creating the DAO objects.
What is DAO implementation?
In computer software, a data access object (DAO) is a pattern that provides an abstract interface to some type of database or other persistence mechanism. (the implementation of the DAO).
What are the components of DAO design pattern?
With DAO design pattern, we have following components on which our design depends: The model which is transferred from one layer to the other. The interfaces which provides a flexible design. The interface implementation which is a concrete implementation of the persistence logic.
Should a factory be a singleton?
Factory pattern delegates the responsibility of creating the instances (objects) to the factory classes. But, singleton pattern ensures the creation of an object should be done only once per application instance.
What design pattern does DAO use?
Data Access Object Pattern or DAO pattern is used to separate low level data accessing API or operations from high level business services. Data Access Object concrete class – This class implements above interface. …
What are the concerns of the DAO implementation?
That’s for the abstract part; let’s get to concrete suggestions. The concern of the DAO implementations is data storage and retrieval. The concern of the factory is how to supply instances. Lifting the singletons from the individual implementations leaves the factory in control of instantiation and life cycle.
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?
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)
What is the purpose of a DAO in PHP?
Use a Data Access Object (DAO) to abstract and encapsulate all access to the data source. The DAO manages the connection with the data source to obtain and store data. The DAO implements the access mechanism required to work with the data source.