How to let an application access the database in Visual Studio

With the enhancement of Web application features, Web applications now basically require backing up the backend database. As the following illustration shows, a Web application now provides a forum for BBS. Users can register users, post posts, and so on on a Web application. To improve query efficiency and reduce response time for Web applications, developers need to equip their Web applications with a suitable database. In this article, I will discuss with you readers how to make Web applications work with databases under the Visual Studio platform. Find a cheap and affordable solution.

I recommend the use of SQL Server Express Edition database.

You can develop Web applications in Visual Studio by using either the ASP.net language or other languages. However, whatever language is used, it can already support most of the databases available on the market, based on current technology. This is done primarily through ODBC or similar database drivers. However, if the number of records is not very large, then I recommend the use of SQL Server Express Edition database.

Because ASP.net and SQL Server Express Edition database are Microsoft's products. When Microsoft was designing, it made them a pair of good partners. Simply put, the SQL Server Express Edition database provides a simple, convenient, low-cost database solution for building Web applications. You can say that the SQL Server Express Edition database is designed specifically for Web applications under the visual Stuido platform.

In this article, I will describe in detail how to deal with the SQL Server Express Edition database and what needs to be noted under the Visual Stuido platform. In order to facilitate the reader's understanding, the author takes ASP language as an example to explain. The main topics include how to connect SQL Server Express Edition databases, build user instances, perform related configurations, read and modify data, and more.

Second, connect to the SQL Server Express Edition database using the ASP.net language.

When a Web application needs to access data in a database, such as authentication, the Web application needs to connect to the database first to query the relevant data. So this first step is how to connect the Web application to the SQL Server Express Edition database.

If you use other types of databases, such as Oracle, you often need to use Third-party database drivers, such as ODBC, and so on. But using SQL Server Express to edition a database doesn't have to be so cumbersome. Because there is already a ready-made interface in the development environment. Developers need to specify a data source for the application to connect the application to the corresponding SQL Server Express Edition database. Specifically, it is achieved through the following statements.

Data source=.\sqlexpress;initial catalo=***;intergrated security=true;

When creating a connection to the management database, I think the following should arouse the attention of readers.

The first is how to manage connections to the database in Visual Studio Solution Explorer. After all, interacting with a database is only part of the work of Web application development. such as the beautification of the Web application interface, and so on, do not need to use the database. If the application is often connected to the database during development, it can affect the efficiency of application development. To do this, developers can set up in Solution Explorer if you need to close the database connection. You can close a connection to a database by right-clicking the database in Solution Explorer and selecting the Detach option. If you are working in Server Explorer, you can also break the connection to the database by right-clicking the database and choosing close connection (although the names are different but the effects are the same).

Second, note that the visual Stuido platform sometimes automatically closes the connection to the database. When you debug or rerun a Web application, any open database connections are automatically closed. To do this, make sure that the data you are preparing to write to the database has been committed, or that no other user is interacting with the database before you perform the debugging operation. This is especially important in team development.

Creating a connection with a database and maintaining it is the foundation of this step. If this step is not done well, then many of the subsequent tasks will run into obstacles.