application layer in osi model

source=192.168.24.169;initial catalog=pc_chargesys; User Id=sa; pwd=123456 "Dim connstr As String = System.Configuration.ConfigurationSettings.AppSettings (" connstr ") Dim Conn as SqlConnection = New SqlConnection (connstr) ' Dim connection as new Sqlhelp.connectionhelp ' Connec tion. Connect () Dim sql As String = "SELECT * from Tb_user where userid= '" User.userid "'" Dim cmd A s SqlCommand = new SqlCommand (SQL, conn) Dim read As SqlDataReader Dim myuser As New Entity.en_user Try

. NET application architecture design-work unit model (get rid of the important idea of Procedural Code and attack DDD against it) Reading directory:1. Background introduction 2. True dilemmas of Procedural Code 3. Simple examples of the work unit Mode 4. Summary 1. Background introduction I have been talking about object-oriented development all the time. However, when developing enterprise

investigation, implements (programming and testing) The core architecture, clarifies the majority of requirements, and responds to high-risk issues. 2. Some key ideas and best practices that may arise during the Refinement phase include: Implement short-term quantitative and risk-driven iteration. Start programming early. Adaptive design, implementation, and testing of the core and risk components of the architecture. Early, frequent, and practical testing. Adjustments are made based on f

Introduction to Web Application network modelThis article describes a common Web application basic process and network model, of course, for most of the Client/server application is also applicable. Continue the style of this series of articles, regardless of the rigor of the popular.OverviewOverall

Today, when using the thinkphp framework to make a Web site, it is an unexpected occurrence when calling the model Fatal error: uncaught exception ' pdoexception ' with message ' sqlstate[ 42S02] Error,The following is my Baidu results, most of the problem can be divided into the following two categories:1.Under Windows iis7.5+php5.4.11 (FastCGI)Missing PDO, editing php.iniUncomment:Extension=php_pdo_mysql.dllRestart IISThe PHP Data Object (PDO) exten

I,LinuxFrame Buffer Device Frame Buffer is an interface provided by Linux for display devices. It abstracts the video into a device, it allows upper-layer applications to directly read and write the display buffer in graphic mode. Such operations are abstract and unified. Users do not have to worry about the location of Physical video memory, page feed mechanism, and other details. These are all driven by the framebuffer device. Frame buffering is wi

Chapter 4 Web Presentation Layer the presentation layer has many specific forms: Web page, Windows dialog box, command line, mobile phone screen, and so on. When discussing the presentation layer, the author focuses on Web presentation layer. Although Web applications do not completely replace ot