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22
votes
4answers
3k views

Do stored procedures violate three-tier separation?

Some colleagues of mine have told me that having business logic in stored procedures in the database violates the three-tier separation, since the database belongs to the data layer whereas stored ...
20
votes
3answers
13k views

Where to put business logic in MVC design?

I have created a simple MVC Java application that adds records through data forms to a database. My app collects data, it also validates it and stores it. This is because the data is being sourced ...
20
votes
4answers
17k views

Why put the business logic in the model? What happens when I have multiple types of storage?

I always thought that the business logic has to be in the controller and that the controller, since it is the 'middle' part, stays static and that the model/view have to be capsuled via interfaces. ...
18
votes
7answers
696 views

Business Objects - Containers or functional?

This is a question I asked a while back on SO, but it may get discussed better here... Where I work, we've gone back and forth on this subject a number of times and are looking for a sanity check. ...
17
votes
6answers
1k views

What is an example of a computationally impossible business problem?

I have coworker who refuses to accept the reality that Turing machines (and Von Neuman machines by extension) cannot solve their own halting problem stating: You can do anything with enough time ...
16
votes
11answers
1k views

How much system and business analysis should a programmer be reasonably expected to do?

In most places I have worked for, there were no formal System or Business Analysts and the programmers were expected to perform both the roles. One had to understand all the subsystems and their ...
16
votes
6answers
5k views

How much business logic should the database implement? [duplicate]

I've worked in some projects where most of the business logic was implemented on the database (mostly through stored procedures). On the other side, I've heard from some fellow programmers that this ...
14
votes
6answers
1k views

Representing business rules with exceptions

I know it is expensive but (IMO) I believe it is a very good practice. I'm talking about rules like say, you can't save an Invoice if you are not a sales person... so in that case throwing an ...
14
votes
2answers
456 views

Pair programming business logic with a non-IT person

Have you had any experience in which a non-IT person works with a programmer during the coding process? It's like pair programming, but one person is a non-IT person that knows a lot about the ...
13
votes
3answers
350 views

How to educate business managers on the complexity of adding new features? [duplicate]

We maintain a web application for a client who demands that new features be added at a breakneck pace. We've done our best to keep up with their demands, and as a result the code base has grown ...
9
votes
3answers
783 views

What is the object-oriented thought process? [closed]

I've been studying OOP in conjunction with Zend's MVC implementation for the past few months. I'm pretty new to programming, generally, but I feel strongly that I should learn things the 'right' way, ...
8
votes
6answers
356 views

How to improve my trade

I'm currently working as a software developer and studying for a software engineering degree (the former whilst not doing the latter). I'm confident in my ability to do my job competently, but I feel ...
8
votes
4answers
366 views

What exactly is a business rule? [duplicate]

I'm trying to better organize my application architecture, so I've been doing some reading, but I keep running into references to "Business Logic" and "Business Rules". I've never really understood ...
8
votes
4answers
7k views

Business Objects within a Data Access Layer

So I've been creating a data access layer via TDD and have approached somewhat of a concern. I'd rather not start down the wrong path, so I figured I'd ask you guys to see if my thoughts were in line ...
8
votes
1answer
3k views

Hooking up a Business Layer and Repository using Unit of Work Pattern

I am having a bit of trouble explaining precisely the question I have here so bear with me. it is similar to the unanswered question found here: ...
7
votes
4answers
3k views

Does business logic really belong on the server?

A typical stack for a web application is a database, a server with server-side code, and a user with a browser with HTML/CSS/JavaScript. Before extensive AJAX, MVC in which the controller was the ...
5
votes
5answers
2k views

How to tackle complex business rule and logic?

I have a domain expert to work with, but he would throws a lot of details to me verbally. The business logics are complex, business rules change often, the business process is long and multi-ending / ...
5
votes
6answers
425 views

Desktop to Web - How to deal with user-interactive workflows

I start a new project this summer, consisting in developing a web version of a proprietary desktop ERP. The main goal of my company is to be able to propose a web version of its ERP, with all ...
5
votes
4answers
2k views

How should UI layer pass user input to BL layer?

I'm building an n-tier application, I have UI, BL, DAL & Entities (built from POCO) projects. (All projects have a reference to the Entities). My question is - how should I pass user input from ...
5
votes
3answers
1k views

Thick models Vs. Business Logic, Where do you draw the distinction?

Today I got into a heated debate with another developer at my organization about where and how to add methods to database mapped classes. We use sqlalchemy, and a major part of the existing code base ...
4
votes
3answers
98 views

Should access logic go in controllers?

I want to know if all the logic related to permissions and access control belongs to controllers (Application logic) or models (Business logic). Currently I have a controller that does something like ...
4
votes
2answers
292 views

What layer to introduce human readable error messages?

One of the things that I have never been happy with on any project I have worked on over the years and have really not been able to resolve myself is exactly at what tier in an application should ...
4
votes
2answers
545 views

Domain Logic in Service Layer exposed as WCF service

I am designing an enterprise solution which consists of modularized products within a product range using Entity Framework code first to define the domain model and provide the data access. e.g. ...
3
votes
2answers
1k views

What is the relationship between the business logic layer and the data access layer?

I'm working on an MVC-ish app (I'm not very experienced with MVC, hence the "-ish"). My model and data access layer are hard to test because they're very tightly coupled, so I'm trying to uncouple ...
3
votes
2answers
357 views

Should I use “Business logic” term when speaking about non-business application?

Suppose there is a part of program that does not deal with initialisation, input, output. It just specifies what should be done, what is allowed or not. I use the term "Business logic" for this. But ...
3
votes
3answers
257 views

Improve address lookup usability and accuracy?

In my application,I have a feature like this: The user wants to add a new address to the database. Before adding the address, he needs to perform a search(using input parameters like ...
3
votes
1answer
186 views

Project structure: where to put business logic

First of all, I'm not asking where does business logic belong. This has been asked before and most answers I've read agree in that it belongs in the model: Where to put business logic in MVC design? ...
3
votes
1answer
221 views

Seperating business logic and layout in a highly interlocked project

My company is developing software that has a lot of technical debt that has existed for more than 20 years. It's a mix of C++ and C and consists of about 2M LOC. I would like to make some suggestions ...
3
votes
3answers
670 views

Entirely separate business logic layer from MVC

We are currently refactoring our controller methods in ASP.NET MVC application. At the beginning we've separated data access layer (our goal was to remove LINQ from controllers entirely). Now we are ...
3
votes
3answers
224 views

What are the pros and cons of implementing this requirement in different layers?

I have a CRUD app for <DomainObject>s. They are persisted in a database. There is a new requirement: keep track of the <DomainObject>s that have been created since the app was opened, ...
3
votes
1answer
108 views

Difference between patterns: Specification, Guarding, Conditions, Monads, Validation,

I'm currently trying to get my head around a few patterns (especially the ones mentioned in the title above) that are made to address different problems and are being used in different parts of the ...
3
votes
2answers
308 views

where exactly should python business logic be placed in django

I have just begun to learn Django/Python/Web Development. This problem has been troubling me for a while now. I am creating an application with multiple templates in Django. I have a views.py which ...
3
votes
1answer
213 views

Logic required to solve a problem relating to location of objects

I have raised a question on dba.stackexchange.com but as the heart of my question is in fact to do with logic I have raised a more general representation of my issue here. I think it is the right ...
2
votes
5answers
6k views

Business Logic Layer in MVC Application

In my ASP MVC application I decided to add another Business Layer and made the model only to have properties. All other functionality like save to db, get from db is done on this new Business layer. ...
2
votes
2answers
714 views

Obtaining the best of both worlds: MVC and WebForms

Rather than asking a general question about WebForms vs MVC (such as in ASP.NET v/s ASP.NET MVC), I have a specific quesiton. It appears the main differences between the two approaches are WebForms ...
2
votes
4answers
1k views

Business rules, business logic, input validation

This might be asked a thousand times but couldn't find the answer. I just wonder how you people handle the business logic errors? Im trying to do a nice api for my business model. Some methods have ...
2
votes
2answers
224 views

Implementing bussiness logic with a large number of business rules and processes

We are currently working on a project that heavily relies on a database. Among many tables the main focus is on table "data" which is linked to another table "data_type" as many-to-one, which is then ...
2
votes
3answers
453 views

DAL vs BLL functions' return types

Here is how I see the main differences between the DAL and the BLL: The DAL directly query the database. The DAL doesn't create new information. It may execute complex sql requests, joining several ...
2
votes
2answers
517 views

Adding dynamic business logic/business process checks to a system

I'm wondering if there is a good extant pattern (language here is Python/Django but also interested on the more abstract level) for creating a business logic layer that can be created without coding. ...
2
votes
4answers
233 views

At what point does data access\manipulation logic becomes business logic?

Consider a service which updates PersonDetail tables in database. I am Using EF which maps the table to this Entity. When a record is updated, it is not actually updated but a new record is created ...
2
votes
4answers
887 views

Architecture strategies for a complex competition scoring system

Competition description: There are about 10 teams competing against each other over a 6-week period. Each team's total score (out of a 1000 total available points) is based on the total of its ...
2
votes
3answers
621 views

design practice for business layer when supporting API versioning

Is there any design pattern or practice recommended for business layer when dealing with multiple API version. For example, I have something like this. http://site.com/blogs/v1/?count=10 which ...
2
votes
2answers
108 views

Separation of retrieving data and business objects between DAL and BLL Layers

I did some research before posting this question. Among other questions or post, one of those is provided below. I could not get a clear mind how to determine.. Business Objects within a Data Access ...
1
vote
1answer
279 views

MVC & 3 tier architecture in game - What is the business layer

I am making a game and have been following examples which use the MVC architecture pattern. I am now trying to get my head around how this would fit in with a 3-tier architecture. From what I have ...
1
vote
2answers
260 views

How to deal with system “static” data in java

I was just wondering if there is some better way how to handle system "static" configuration data. Let say you have a system which offers several operation which are in code translated to operation ...
1
vote
2answers
431 views

How can I write complex validation and business logic that can be reused in both direct data model changes and pending dialog changes?

I was hoping for some advice: I need to design a software solution for a medium-sized java / Swing application. The application will have about 200 use cases requiring complex data validation and ...
1
vote
1answer
220 views

Confused about implementing Single Responsibility Principle

Please bear with me if the question looks not well structured. To put you in the context of my issue: I am building an application that invoices vehicles stay duration in a parking. In addition to ...
1
vote
2answers
245 views

Describe business logic with diagrams

I am currently developing a web application for my thesis.I was asked by my professor to make diagrams to describe the business logic. Since I don't have a prior experience, I am pretty confused with ...
1
vote
1answer
161 views

Class Design for special business rules

I'm developing an application that allows people to place custom manufacturing orders. However, while most require similar paperwork, some of them have custom paperwork that only they require. My ...
1
vote
1answer
528 views

Sample domain model for online store

We are a group of 4 software development students currently studying at the Cape Peninsula University of Technology. Currently, we are tasked with developing a web application that functions as a ...