1-tier vs 2-tier vs 3 tier Applications Definitions An application - software that interacts with the user and has an in

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1 Tier Vs 2 Tier Vs 3 Tier Applications Definitions An Application Software That Interacts With The User And Has An In 1 (203.47 KiB) Viewed 49 times

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1-tier vs 2-tier vs 3 tier Applications Definitions An application - software that interacts with the user and has an interface for the user. There will be input from the user and output displayed to the user. A service - software that is interacts with other software. Services run in the background. It may interact with the OS such as a print spooler or it may interact with other software such as API's. Logical Layers of software • Presentation - interacts with the user by getting input and displaying output - also known as the user interface and front-end. • Application - applies the "logic" to the interface. This is also known as the business layer (because the logic is called the "business rules") and middleware (in the middle) • Data - data might be stored or retrieved using code in this section of software. Also known as the back-end. IPO Model In CS 105, you should have been introduced to the IPO model shown below. The logical sections of software listed above can correlate to the sections of the IPO model. How? Input-Process-Ou Input Process Output Input - Process - Ou Input Process Storage It is a stage where external data or information flows to the process within the algorithm. It is a stage where input data is worked upon and transformed into some output. It is a stage where result of the process within the algorithm is output. Output

The layers listed above are logical separations of an application. Since software can interact with other software, it is possible to put the layers into separate functional pieces of software that may even execute on different servers. These functional pieces of software are known as a tier. 1-tier A one-tier architecture keeps all the layers of an application, including the interface, application and data, in one place. Developers see these types of systems as the simplest and most direct. What is a DLL? Dynamic Link Libraries (DLL)s are like EXEs but they are not directly executable. They are similar to .so files in Linux/Unix. That is to say, DLLs are MS's implementation of shared libraries. 2-tier Typically called - client-server. The user interface is in a client tier and the application and database layer are combined in the server tier. DLLs are so much like an EXE that the file format itself is the same. Both EXE and DLLs are based on the Portable Executable (PE) file format. DLLs can also contain COM components and .NET libraries. 3-tier Each of the three logical layers are separated into its own tier. As components increase, troubleshooting becomes more difficult. a Note that it is possible to to host the tier on the same computer/server or separate each into a different computer/server. You will see in the lab that each tier can be compiled to it's own .dll file (see right) and that source code can referenced from another tier. What does a DLL contain? A DLL contains functions, classes, variables, Uls and resources (such as icons, images, files, ...) that an EXE, or other DLL uses. In this lab, you will create 1-tier, 2-tier, and 3-tier applications that will access a file (using a file instead of a database for this lab to keep it simple). This file will contain phones, but similar applications can be written to store any data. Source: https://stackoverflow.com/questions/124 ... -they-work Help for those new to Visual Studio • Microsoft Visual Studio tutorials C#c • Create a windows Forms app in Visual Studio with C# a n-Tier Application Overview e .

To Do: Note: Though the video steps through each part of creating the applications, there can be bugs introduced by missing a step on selecting the wrong item. For example, in the third video, I selected the wrong input mask. Since there is not a lot of coding, I suggest you start again if you run into a bug. If you are having trouble with the 2-tier web app, let me know and I will post a desktop app alternative. 1. Follow the steps in the video to create a 1-tier desktop application that accesses data using a file: Creating 1-Tier C# Application e 2. Follow the steps in the video to create a 2-tier web application (you may do this application on the platform Windows Desktop application if you would prefer: Creating a 2-Tier C# Web Application e 3. Follow the steps in the video to create a 3-tier desktop application using the same data file: Creating a 3-Tier C# Application 2 To Submit: The end of the third video steps through how to zip up the solution folder. You should submit a solution folder to each of the applications above.