Drawing on the three-tier architecture of PetShop4.0, all database operations use stored procedures, use NUnit to test the data operation layer, and attach development documents. Database usage: The database can be attached in the DB_51aspx folder, and 2005 must be used. Registered user login use case: admin/admin Administrator login use case: admin/admin888 Function introduction: Website front-end functions: Register shopping cart book collection book classification book search popular book sales book ranking popular book ranking recommended book picture rotation advertising browsing history other buyers page purchased registered member login change password personal information management place order order email notification payment order management Book favorites Exit the system Website backend functions: Backend login Modify password System settings Book management Book categories Add book orders Management order list Order search Order processing Order categories