Three-tier architecture

The three-tier architecture (3-tier architecture) typically has a three-tier architecture that divides the entire business application into: the interface layer (User Interface layer), the business logic layer, the data access layer Access layer) represents the tier (presentation tier). The purpose of distinguishing hierarchy is to think of "high cohesion and low coupling". In the design of software architecture, layered structure is the most common and most important structure. Microsoft's recommended layered structure is generally divided into three tiers, from bottom to top: The data access layer, the business logic layer (or also called the domain layer), the presentation layer.

The role of each layer edit 1: The data access layer: mainly the original data (database or text files, such as the form of data storage) operation layer, rather than the original data, that is, the operation of the data, not the database, Provide data services specifically for the business logic layer or presentation layer. 2: Business logic Layer: mainly for the specific problem of operation, can also be understood as the operation of the data layer, the data business logic processing, if the data layer is a building block, the logic layer is the building of these blocks. 3: The interface layer: The main means of the web, can also be expressed as a WinForm way, the web can also be represented as: ASPX, if the logical layer is quite powerful and perfect, no matter how the presentation layer is defined and changed, the logic layer can provide services perfectly.

Three-tier architecture