3-tier | 易学教程

Traditional 3 tier architecture vs 3 tier with IOC

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问题 I am building a 3 tier architecture with a Presentation Layer (PL), Business Logic Layer (BLL) and a Data Access Layer (DAL). Conventional 3 tier architecture logic states that BLL should act as a mediator between the PL and the DAL. The PL shouldn't be even aware that there is a Database while the DAL should not be aware that there is a BLL or a PL. Implementing above would create following dependencies among the 3 different physical projects as follows PL Project -> Reference of BLL DLL BLL

The type or namespace name 'CrystalReportViewer' does not exist in the namespace 'CrystalDecisions.Web' (are you missing an assembly reference?)

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问题 I'm getting the following error on using crystal report in my asp.net 3.5 a3-tier application The type or namespace name 'CrystalReportViewer' does not exist in the namespace 'CrystalDecisions.Web' (are you missing an assembly reference?) the namespaces I have included are: using System; using System.Collections; using System.Configuration; using System.Data; using System.Linq; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web

How many of you do 3-tier design?

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问题 3-Tier design has been my standard design philosophy for years for database driven applications, and it has never failed me. For those who practice it, describe your layers. I've found that many people muddle up the business tier and the data access tier, making it more like a 2.5-Tier design. I prefer to move the data tier almost entirely into the database using stored procedures, and just have a very lightweight data tier in code that wraps sproc calls into business objects. How do you

ViewModel location when doing CQRS

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问题 Suppose you have a layered project divided into the Presentation Layer, the Business Layer and the Data Access Layer. If you were using CQRS, you would be doing queries directly from the Data Access Layer into the Presentation Layer and bypassing the Business Layer. In that case, if you are using ViewModels in your presentation layer, then your Data Access Layer would need reference to the Presentation Layer to return data in terms of the ViewModels in the presentation layer. Wouldn't that be

Uses of Business Logic Layer

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问题 I know this may be a duplicate question. But i never found a correct explanation that a beginner like me can understand. My question is "What all things we can do inside Business Logic Layer". I have done 3 tier architecture projects. But I used BLL only to pass values between UI and Data Layer. But whenever i attend an interview they asks me what all things you do inside BLL. Please help me to understand the correct use of BLL. Please provide little bit of sample code if you can. 回答1: This

Uses of Business Logic Layer

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I know this may be a duplicate question. But i never found a correct explanation that a beginner like me can understand. My question is "What all things we can do inside Business Logic Layer". I have done 3 tier architecture projects. But I used BLL only to pass values between UI and Data Layer. But whenever i attend an interview they asks me what all things you do inside BLL. Please help me to understand the correct use of BLL. Please provide little bit of sample code if you can. This question may get deleted because it is not in the format that stackoverflow likes. BLL handles the business

Error “The type or namespace name could not be found” during a build process

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I'm using in C# Windows Application, I have using TempProWin --> For Windows Application Projects TempProApp --> For Database and functionality like Class File using CSLA Method. In TempProWin.frmLogin.cs: using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using TempProApp; private void frmLogin_Load(object sender, EventArgs e) { UserLoginList oUserLoginList = UserLoginList.GetUserLoginList(); cmbUserName.DataSource = oUserLoginList; cmbUserName.DisplayMember =

The type or namespace name 'CrystalReportViewer' does not exist in the namespace 'CrystalDecisions.Web' (are you missing an assembly reference?)

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I'm getting the following error on using crystal report in my asp.net 3.5 a3-tier application The type or namespace name 'CrystalReportViewer' does not exist in the namespace 'CrystalDecisions.Web' (are you missing an assembly reference?) the namespaces I have included are: using System; using System.Collections; using System.Configuration; using System.Data; using System.Linq; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; using System.Xml.Linq; using MorvelNew

Create Three Tier Application using Maven

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问题 I want to create a multi-layer java project using maven as follows: PresentationLayer-GUIModule (top most layer for jsp/jsf pages) PresentationLayer-GatewayModule (topmost layer for web services) BusinessLayer-ServiceModule (middle layer) DataAccessLayer (lowermost layer) CommonLayer (vertical layer which is accessible from all layers) Maven Module Structure: root pom EAR pom GUIModule pom GatewaModule pom ServiceModule pom DataAccessLayer pom CommonLayer pom I have create a project called

what is Microsoft.Practices.EnterpriseLibrary.Data

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问题 I want to know what is Microsoft.Practices.EnterpriseLibrary.Data and why we use this dll. what are the benefits of this dll. I want to create a project on 3-tier architecture what is the best way for sql queries. weather i use this dll or go for simple sqlcommand and dataadapter. currently i am working in this way: My Code in DAL File is: public void Insert(long id) { connection.Open(); SqlCommand dCmd = new SqlCommand("test_procedure", connection); dCmd.CommandType = CommandType