ASP NET,C#与数据库 毕业论文外文翻译.docx
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1、ASP.NET, C # and database The ASP stands for Active Server Pages, Active Server Pages. Why called Active Server Pages, this is because the Internet all the static HTML pages, if you need to update your website content, you have to make a large number of HTML pages. Later with the ASP, we can accordi
2、ng to different users at different times to the user to display different content. ASP.NET is not just the ASP 3, a simple upgrade, it is more, we provide a new and powerful server control structure. From the exterior view, ASP.NET and ASP are similar, but the essence is completely different. ASP.NE
3、T is almost entirely component-based and modular, a page object and HTML elements is a Component Object run. On the development of language, ASP.NET abandoned VBScript and JScript, and use. NET Framework VB.NET, C #. NET language support their development of language, these languages generated web p
4、ages in the background has been converted into Class compiled into a DLL. Because ASP.NET is compiled to implement than the ASP has a higher efficiency.ASP.NET is Microsoft has introduced for writing dynamic web a powerful new technology, is Microsofts Active Server Pages (ASP) and. NET collection.
5、ASP.NET has a powerful database manipulation, is widely used in database software development, is a popular database development. Therefore, the database connection in ASP.NET technology has important application value. Database connection technology has been a lot of research. ASP.NET is a compiled
6、. NET-based environment, you can use any. NET-compliant languages (including Visual Basic NET in C # and JScript. NET) authoring application. In addition, any ASP.NET application can use the. NET Framework. Developers can easily access the benefits of these technologies, which include the managed co
7、mmon language runtime environment, type safety, inheritance, and so on. The syntax of ASP.NET is largely compatible with ASP, but it also provides a new programming model and structure, can generate a better application scalability and stability, and provide better security. Gradually add the featur
8、es of ASP.NET in existing ASP applications, at any time to enhance the functionality of the ASP application. In the development and application in a production state, ASP.NET supports NET Framework debugging tools for local and remote debugging. When the application is in production status tracking
9、statements can remain in the product code without compromising performance. According to the needs of the application, ASP.NET can cache page data, part of the page or the entire page. Cache item can depend on the file or other item in the cache, or you can refresh the expiration policy. ASP.NET is
10、designed to be extensible, has a special proprietary features to enhance the cluster, the performance of the multiprocessor environment.ASP in the script engine is restricted, is especially VBScrip t - and JavaScript. ASP.NET can support multiple languages in VS.NET, such as C #, VB. Net. This means
11、 you can get rid of VBScrip t language restrictions, the code will be compiled and run instead of the original interpretation of the implementation.Released software as a service on the Internet is the core of the WebServices. ASP NET provides the basis for construction of a WebServices environment,
12、 enabling developers to create services for this service model. Web Services difference is that it allows you to expose a service without having to expose the data. When the automatic provision of commercial services at the same time, code and data are safe. ASP code, and content are mixed together
13、to design and write code at the same time could be difficult. If the page you need to upgrade, there will be a dangerous potential problems. The ASP.NET There are two ways to solve this problem. The first one is the code inline model, the model code is still stored in the ASP NET page, but it does n
14、ot and HTML mixed together. The second method of separation of code and content is the code-behind model, the model code has been completely transferred to a separate file.COM objects no longer need to be registered on the server, it is very loved by programmers. However, this process is simplified,
15、 you no longer on your server to run a DLL version, and the code is quite confidential. This means that if the right development tools and source code, is unlikely to change the code.In the basic operation of the ASP NET application environment security involves three steps namely authentication, au
16、thorization, and simulation. Authentication process to authenticate the user identity, to allow or deny the request. This relates to accept user credentials (such as user name and password) to check and certificate. After authentication, the request of the legitimate users of resources will be met.
17、The next period of time, the user requests a resource without further authentication, Web application until the user exits. The authorization is to give users access to specific resources qualifications. The simulation process is the application to confirm the users identity to obtain the required r
18、esources. Simulation-based identity, the requested resource will be granted or refused.The A Why use a three-tier structure? Because each layer can change only a small amount of code, you can put on a different server on the physical use, so the structure is flexible and better performance. In addit
19、ion, each to do what other layers can not see, so the change to update a layer no longer need to recompile or change all of the layers. This is a very powerful feature. For example, if the data access code and business logic layer separation, when the database server changes, you only need to change
20、 the data access code, business logic layer is unchanged, so there is no need to change or recompile the business logic layer.A three-tier applications typically include: the presentation layer, business layer and data layer.The presentation layer (Presentation Layer) used for the display of the use
21、r interface, as well as the business layer classes and objects to drive these interfaces.In ASP.NET, the layer including the aspx pages, user controls, server controls, as well as some security-related classes and objects.Business Layer (Business Tier) used to access the data layer, take the data, m
22、odify data, and delete data from the data layer, and returns the results to the presentation layer. In ASP.NET, this layer includes using SqlClient or OleDb to take data from a SQL Server or Access database, update data and delete data, and data obtained on the DataReader or DataSet back to the pres
23、entation layer. The returned data may be only one integer numbers, such as the number of rows in a table, but have the data of the data layer is calculated.The data layer (Data Tier) is a database or data source. In. NET, usually it is a SQL Server or Access database, but not limited to this in two
24、forms, it may be is Oracle, a MySQL, or even an XML.The static pages is to interconnect can not be achieved, only in the interactive web pages to client data and WEB server and web database server for dynamic linking. Based on the reason why TCP / IP, Internet / Intranet technology is widely used in
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