3 tier architecture

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3 Tier Architecture

Evolution to the 3-tier Architecture

Single Tier

Dual Tier

3-Tier

…

N-tier

Single Tier Architecture

Single-Tier Architecture

• In 1-Tier Architecture the file you want to work with must be accessible from a local or shared drive.

• simplest of all the architectures, but also the least secure.

• Since users have direct access to the files, they could accidentally modify, delete the file by accident or on purpose.

• simple and cheap, but usually unsecured and data can easily be lost if you are not careful.

Two-Tier Architecture

Two-Tier Architecture

• Because of the two components, it is also called Client-Server architecture.

• Client - runs the application. • Server - handles the database back-end• The client computer can only access the data by

starting the client.• Data on the server is much more secure.• Users are unable to change or delete data unless they

have specific user rights to do so.

Two-Tier Architecture

• Allows multiple users to access the database at the same time .

• Server is processing data, which allows the client to work on the presentation and business logic only.

i.e, client and the server is sharing the workload.

3-Tier Architecture

3-Tier Architecture

• Involves one more layer called the business logic tier, service tier or middle tier (layer).

• In the client-server solution the client was handling the business logic and that makes the client “thick”.

o makes it difficult to use over slow network.• In 3-tier only little communication is needed between the

client and the business layer making the client “thin” or “thinner”.

• Example of a thin client • Internet browser - see and provide information fast

and almost with no delay.

• Three-tier solution is more scalable, as more users access the system.

• middle layer protects the database tier, hence security is best.

• major drawbacks of N-tier architecture :• Increases the complexity.• Increases cost of installation.

3-Tier Architecture

Differences among 1-Tier,2-Tier,3-Tier Architecture

1-Tier 2-Tier Multi-TierBenefits Very simple

InexpensiveNo server needed

Good securityMore scalable

Faster execution

Exceptional security

Fastest execution“Thin” clientVery scalable

Issues Poor securityMulti user issues

More costlyMore complex“Thick” client

Very costlyVery complex

Users Usually 1 (or a few) 2-100 50-2000 (+)

3-Tier Application in ASP.NET

• The Program is organised into three major distinctive tiers or layers:– Presentation Layer (User Interface)– Business Layer (Business Access Layer)– Data Layer (Data Access Layer)

User interface layer

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Tbl_student_information

Presentation Layer

Business Access Layer - Properties

Business Access Layer

Data Access Layer

Presentation Layer

23

Creating an Object of Property Layer

Presentation Layer

24

Creating an Object of Business Layer

Presentation Layer

25

Data Object to Receive Data sent by Business Layer

Presentation Layer

26

Obtaining ID from Property Layer

Presentation Layer

27

Calling Business Layer Function

Business Access Layer

28

Calling Data Layer Function

Data Access Layer

29

Result Object Declaration

Data Access Layer

30

SQL Query Definition

Data Access Layer

31

Creating Object to receive data

Data Access Layer

32

Query Execution

Data Access Layer

33

Returning the Information of the Database

Business Access Layer

34

Retuning the Information of Data Layer

Presentation Layer

35

Returning Data From Business Layer

Presentation Layer

36

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