Shulou(Shulou.com)06/02 Report--

This article mainly introduces "what is the three-tier structure in the ASP.NET development mode". In the daily operation, I believe that many people have doubts about what the three-tier structure in the ASP.NET development mode is. The editor consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful to answer the doubts about "what is the three-tier structure in the ASP.NET development mode?" Next, please follow the editor to study!

ASP.NET has been out for several years, but the traditional Form model is still used in the development mode, without the support of mature development patterns. The disadvantages of this technology are obvious, such as low code reusability, poor scalability, and trouble of future modification and maintenance.

An example of the architecture of the three-tier structure of the ASP.NET development model is as follows:

Using System; using System.Text; using System.Data; namespace AccessHelper {public interface IHelper {DataTable ExecuteReader (string connectionString, CommandType cmdType, string cmdText); int ExecuteNoneQuery (string connectionString, CommandType cmdType, string cmdText); object ExecuteScalar (string connectionString, CommandType cmdType, string cmdText); void AddParameter (string key, object value) }}

The IHelper interface of the DbHelper module is defined as follows:

IHelper is used to execute SQL statements directly, and its three main methods are divided according to the three methods of the Command object. The ExecuteReader method returns the DataTable type and uses DataAdapter to Fill the data into DataTable. The advantage of this is to disconnect the database as soon as possible and release resources.

The DbDAO module is defined according to the concrete Model class, and its function is to convert the DataTable obtained from DbHelper into the concrete class. DbDAO uses the DBHelperFactory factory class to instantiate the corresponding IHelper class through the parameter DataBaseType parameter.

The DbDAL module is used to handle all kinds of data access logic, such as login, registration, and so on.

At this point, the study on "what is the three-tier structure in the ASP.NET development model" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.