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Layer-5 logical Architecture DesignLogic: LogicalPhysical: PhysicalArchitecture: ArchitectureFramework: FrameworkPresentation Layer: PresentationUser Interface: User InterfaceBusiness Logic: Business LogicData AccessData and Storage Management: Data and Storage ManagementGraphical User Interface: Graphical User InterfaceFat Client: Richer Client-sideSmart Client: Smart ClientApplication: ApplicationServer control: Server-side controlEvent-drivenReusab

number and passwordRoomtype: Room type ID, room type name, Price/dayRooms: Room ID, Room type (foreign key), Room status ID (foreign key), description, number of bedsGuestrecord: Customer ID, Customer name, gender, social security number, contact phone, room ID (foreign key), check-in status ID (foreign key), check-in date, deposit, room, dining consumption, check out date, transaction numberRoomstate: Room status ID, room status (check-in, idle, repair)Residestate: Room status ID, check-in sta

Distributed Application Program Overview Application designers can use the. NET platform to develop, deploy, and support distributed applications. Highly integrated and flexible. This platform enables developers to generate end-to-end business solutions that can leverage existing architectures and applications. Windows DNA is an architecture used to generate tightly coupled distributed Web applications. Because distributed applications begin to require more loose coupling principles, the

I. Middleware implications : The median price is a common service that is located between various platforms (hardware and operating systems) and various applications.Help your application achieve efficient, reliable messagingEnables easy interoperability between applicationsBuild enterprise applications efficiently and reliablyEnable rapid setup and deployment of distributed applicationsNote: Middleware is software, between application software and system software, is a kind of software, not one

One or three-layer framePresentation layer: Also called the view layer, with HTML, CSS, JS, jqueryBusiness Logic Layer: Also called the control layer, which contains the implementation part of the business logicData management layer: the part that interacts directly with the databaseIi. formation of a three-tier framework (existing example)1. Data Management layerA. Introduction of Model classAfter the project is created, the Model directory is establ

($), cannot start with a number, cannot be a keywordClass Name: First Capital, first letter of the second wordMethod Name: First letter lowercase, each word capitalized9. Dataprogram = data + logicData type: base data type, reference data type (array, class, interface)10. ConstantsInteger type:Decimal: The numbers that are often in lifeBinary: Start with 0b, such as 0b1001;Hex: Starting with 0x, the number is composed of 0-9 and a-f, such as 0xa;Octa

, namely the conceptual data Model (conceptual Datamodel), the logical data pattern (Logicdata model) and the physical data Model (physical).1. Conceptual Data ModelConceptual data model, also known as conceptual model, is an objective-oriented, user-oriented model, independent of the specific database management system and independent of the specific computer platform. People usually first abstract the real world into the information world, establish

be dispersed to different MySQL tables or libraries, to achieve distributed results, to support a very large amount of data. The preceding table partition is essentially a special in-Library sub-tableIn the Library sub-table, simply to solve the problem of single table data is too large, because the table data is not distributed to different machines, so to alleviate the pressure of MySQL server, and not much role, we still compete with a physical machine on the IO, CPU, network, this will be t