[Chatter]: "layer" of a three-tier architecture"

 

The "layer" in the three-tier architecture should be divided into tier and layer.
Both Chinese translations are "layers", but they are the same but different "layers ".

 

In the same way,
Cut the system into presentation, business logic, and data access based on functions.

 

The difference is that,
One system is cut into three subsystems (Tier): Presentation tier, business logic tier, and data access tier.
One layer divides the system into three layers: presentation layer, business logic layer, and data access layer.
When each tier is designed, it can be further split into three layers ).

 

The main difference is that the angle of the system is different.
For example

 

Ms SQL SERVER: think of three layers
Presentation Layer: SQL Server Management studio receives online queries from ADO. net.
Business logic layer: Data Objects and service functions.
Data access layer: MDF read and write objects.

 

Self-written ASP. NET Website: As three tier
Presentation tier + business logic tier: ASP. NET
Data Access tier: ms SQL Server (online queries through ADO. Net)