Business logic
（重定向自Domain logic）
![Business logic in theory occupies the middle tier of a 3-tier architecture.](/Images/godic/202501/09/Overview_of_a_three-tier_application_vectorVersion.svg0547.png")
In computer software, business logic or domain logic is the part of the program that encodes the real-world business rules that determine how data can be created, displayed, stored, and changed. It is contrasted with the remainder of the software that might be concerned with lower-level details of managing a database or displaying the user interface, system infrastructure, or generally connecting various parts of the program.