What happens when the Dal returns a BLL object?

What happens when the Dal returns a BLL object?

If the DAL returns Dal objects then, the logic to retrieve and fill in the Address can only be in the BLL. If the DAL returns BLL objects, then the logic to retrieve and fill in the Address can be either in the BLL or DAL. Currently the DAL is returning the Business Objects and the logic to fill it in is in the DAL.

Which is a specific pattern belongs to the Dal?

The Repository is a specific pattern that belongs to the DAL (see list of patterns at the end of this link ). It says exactly how to abstract a specific access to data: by offering a collection like interface to the data store. Interestingly, in your example of class library, DAL.Product seems to be a repository.

What’s the difference between A Dal and a repository?

DAL is a general term for abstracting away Data Access concerns. Repository is a similar, but more specific, concept from DDD. Your DAL will likely be composed of several Repositories. The Data Access Layer is an architectural layer that intends to abstract access to data.

How is the dalcustomer object consumed by the business layer?

You can view the DalCustomer object as the interface or contract consumed by the business layer (or consumer). In effect if it returned a BllCustomer the DAL would have to cater for every business layer object that calls it or could potentially call it.

How is the BLL implemented in a project?

In a real-world application, the BLL should be implemented as a separate Class Library project; however, for these tutorials we’ll implement the BLL as a series of classes in our App_Code folder in order to simplify the project structure. Figure 1 illustrates the architectural relationships among the presentation layer, BLL, and DAL.

How to create a business logic layer ( BLL )?

In this tutorial we’ll see how to centralize these business rules into a Business Logic Layer (BLL) that serves as an intermediary for data exchange between the presentation layer and the DAL.

What’s the difference between Dal and strict layering?

Then from your code you will only deal with those interfaces and not with the concrete generated classes. A little glue code might be needed to hold this together; that with the EDMX can be your DAL. There are two general approaches to layering: strict layering and relaxed layering.

How to separate data from a business object?

Just like how the BLL converts the data it consumes (from other project) into its own object (= the business object); the DAL should be doing the same thing. It should take the database entities and it should convert it into its own object (= the data object).

Is the business layer independent of the data layer?

Preferably your business layer should also be independent of your Data Layer. The Business Layer is responsible for your business rules. It is here you will add your validations using a validation framework to enforce your business rules. Your repository should return the BLL or domain object. chances are you don’t need a DAL object at all.

Is the Dal the same as the Bal?

Closed 6 years ago. Each layer has its own DTO object including the BAL and DAL. My questions regarding this are as follows The DTO returned by the DAL is simply converted to the corresponding DTO in the BAL and sent to the UI Layer. Both attributes and the structure of the DTO objects are the same in some cases.