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Questions tagged [3-tier]

For issues relating to setting up and utilizing a 3-tier architecture.

3-tier is a software architecture in which the presentation layer, business access layer and data access layer are developed and maintained as independent modules, sometimes on separate platforms.

370 questions
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External communication in the 3 Tier Architecture

When I read about the 3 Tier Architecture I can not understand where communication over eg FTP and Telnet fits the model. Should I place the communication layer beside the Data Access Layer? It seems logical when I use FTP and Telnet to retrieve…
magol
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Windows service as Service Layer in layered architecture

I have an asp.net project with is created using layered architecture (Presentation, Business and Data Access layer). Now I need to add a windows service to the project which will do a background process. The user can logout from the site, but the…
Dev
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the bll,dal and interfaces implementation

My question is related to the bll,dal,interfaces. My project's constructure more or less like this. BLL, DAL, OBJ and 3 layer architecture (As I dont repeat question and codes again,I give the link here) My question is why should I use…
sakir
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Presentation layer in 3-tier architecture

My question is about various ways of implementing presentation layer in 3-tier architectures When we talk about a 3-tier web application, it is assumed that the presentation layer is browser-oriented, and hence communicates with logic tier through…
mangusta
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Business layer, data layer, where to put queries?

I have a data access layer that has separate classes for each table in the database. Each class makes objects that reference a row in the table, they have create, update, delete, and fetch functions. They all extend a DBObj class. My question is,…
roflwaffle
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Using CouchDB with Laravel 4 in a 3-tier app

I'v been searching hardly these past days in how to use CouchDB in the 2-tier, I haven't found a properly documented and useful resource (Doctrine's CouchDB ODM seems very vague I think), so the question is: How are you using CouchDB in your app,…
Dilip Ramirez
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BL vs DAL when validation requires the DB

I am planning to put validation logic in business logic layer which could include things like: [Required], [Length > 0], etc. Using data annotations. However, I also need a validation rule that checks that the object is not a duplicate before…
O.O
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Error handling: Exceptions vs Error method

I'm creating a 3-tier app and I have a problem dealing with error handling. I don't know if I should throw an exception or call a method to communicate the problem to the other layers. Here is a quick exemple, I have: - a FileChooserFrame…
DeadlyJesus
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updating records in datagridview using 3 tier architecture in c#

How to edit a datagridview in c# that will update the database using 3 tier architecture. Could somebody share the code sample since i am new to this 3 tier concept.
user2059013
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using JDBC Connection from presentation tier in 2-tier and 3-tier applications

I am writing a module that will be used in different applications (2-tiers and 3-tiers). I'll need to connect to a DB. so, I made the module requires a java.sql.Connection object as a parameter when used with a 2-tier application. there's no problem…
Attilah
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Layers and Entities?

(I'm gonna ask 2 question please). We use 3 layers: Bl , Dal , UI. We didn't want to build one big BL , DAL for All Objects. So we created this structure both for Agents and Leads. Now lets say I should write a method : public Agent…
Royi Namir
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Java-EE: How to design data flow in a 3-tiered application environment?

I am currently working on a distributed application using the following components: 1.tier: Database-Server -> MySQL 5.5 2.tier: Application-Server -> Glassfish 3.1.2.2 3.tier: Stand-alone Fat-Client -> Java-SE (JRE 6) I use JPA 2.0…
salocinx
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In which layer extension methods will come in a 3 tier architecture

I am creating a 3 tier architecture web application, and I want to use extension methods. In which layer should I place the extension methods? Thanks.
Becks
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Manager Layer vs Service Layer

In the 3 tier architecture there is Presentation/Web Layer, Service Layer and DB Layer. However in a recent project I worked on I saw a Manager Layer which is new to me. Can you please explain the difference between Service Layer/ Classes vs Manager…
Fahim
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MVVM to interact with a web-service in a 3-tiered application

Question: Does it make sense to use MVVM for a UI that interacts with a web-service in a 3-tiered application? Details: Application's architecture is 3-tiered: Presentation Layer <--Web-Service-->| Business Layer | Data Access Layer Front-end:…
mauryat
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