mvc dropdownlist from database

(a) contyolles public actionresult checkuserid (string id) { // string[] s = new string[] {"1", "2", "3"}; BOOL New ZHUCEBF (). Yanzheng (ID); = IsOK; return Partialview (); } (ii) model public bool Yanzheng (string ID) { var query = Context.zhuce.Where (p=>p.userid== id); if (query.) Count () >0 ) { return false ; return true ; }(iii) view@{ "checkuserid"; @{ bool

Learn the ASP. NET MVC program, combined with jquery client code, post data to the database. Insus.net writes today an example of completeness.In the database, create a table [dbo]. [TestUser]:Now that you have the data in the database, you have to create a stored procedure [dbo] in the

MVC series (repository mode, LINQ, EF, IOC framework Castle, jquery, Ajax) (2) models (ORM) MVC series (repository mode, LINQ, EF, IOC framework Castle, jquery, Ajax) (3) models (ORM, repository mode, paging) I haven't updated it for a long time. I 've been mixing it all day in my blog. I don't have any of my own things, so I am always a little confused. In fact, I have the idea of writing something

the database data through the instance usingCodefirst.models;usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingsystem.web;usingSYSTEM.WEB.MVC; namespaceCodefirst.controllers { Public classBookscontroller:controller {// //GET:/books///MyBooks is the same class that inherits the DbContext data context and is also the name of the connection database string added in the Web. config file

Label:First, development background:Since the old system has been unable to meet the actual business requirements, it is necessary to develop new projects even on existing databases.Second, the difficulty point:The EF is not allowed by default when you want to delete an existing database table and recreate it. When you create a database object, you are prompted to "an object named ' XXXXX ' already exists i

Servlet+oracle MVC architecture to build a simple shopping cart Web projectThe main implementation of the following features:1. User login, verify the legality of the user from the database.2. The shopping hall, take out the product from the database to display.3. In the shopping hall you can click on the purchase item and jump to my shopping cart interface.4. On

After a series of MVC exercises, such as database data display, add, delete, and so on, a function, is the update, that this exercise is the MVC database data to update.Write a good update of the stored procedure:With stored procedures, it is possible to have a realistic body (Entity) method. Write an updated method, t

The previous article was just a simple spring MVC framework and then added some interaction with the database.First, add JDBC-related configurationAfter adding dependent dependencies in Maven, configure database access parameters and data sources. Database parameters using the configuration file, the code is as follows: Jdbc.properties1Jdbc.driver=Com.mysql.jdbc.

Today, a colleague asked how to add a validation feature to the model when using the entity Framework's database frist or model first? Because the model at this time is how the VS tool is generated, it is too realistic and unreasonable to directly add attribute to the Modle class. A more reasonable approach is to use the buddy class approach to achieve.For example, there is a model class: Movie. Then we can add a local class file, the contents of the

Code First database migration under ASP. net mvc 4, asp. netmvc 1. Enable the command 1. Open the console: View> other Windows> Package Manager Console; 2. Start database migration and execute the command: enable-migrations 　　After the creation is successful, the migrations directory will be added. If the following error is reported: PM>Enable-MigrationsMore th

problem is still unresolved.I also carefully observed the program I wrote, found in the program to create a table in the database operation, the following statement:"CREATE TABLE Friendslist (QQ varchar (7) Primary Key,remark varchar (), groupName varchar (20));"In this way, the problem becomes clear, the original creation of each table must set the data encoding method, the following statement:"CREATE TABLE Friendslist (QQ varchar (7) Primary Key,re

Summary of three methods for connecting. net MVC to the local database,. netmvc . Net MVC connection data local database three methods Public class HomeController: Controller {// GET:/Home/public ActionResult Index () {# region connect SQL function one SqlConnectionStringBuilder one = new SqlConnectionStringBuilder

;}} } ------------------------------------------------------------------------------------------------------------- The data context class created: using Pagingandsortinginmvc.entities; Using System; Using System.Collections.Generic; Using System.Data.Entity; Using System.Linq; Using System.Web; Namespace Pagingandsortinginmvc.models {Public class Applicationdbcontext:dbcontext { Public Applicationdbcontext () : Base ("name=connectionstring") {} Public dbset}}---------------------------------

access the database. After using EF to get the database data code is much less than before, a code can complete the data acquisition function, greatly improve the development efficiency. One of the issues to note in this article is that EF is indirectly used by the main project, so some EF-related features such as update Database (update-

--right--Execution8, and the database is established. The next step is to create a database context instance and manipulate the data Object! Summary:Using database precedence and model precedence does not require the developer to establish the class and database context corresponding to the tables in the

use a custom MembershipProvider, then the above code is obviously not enough, such as System.Web.Security.MembershipProvider's first Method ChangePassword (), It is used to change the user's password, which requires the code we write ourselves to implement its logic.Then the second method, Changepasswordquestionandanswer (), is used to provide the user with the answer to the change question, and the third method CreateUser () is used to create a new user:The above is MembershipProvider, and the

About the Validation failure for one or more entities. See 'entityvalidationerrors' property for more details when EF Code First is used in ASP. net mvc to read the database ., Today, I encountered a lot of problems when I was building a small website. Alas, I am a newbie and I don't know much about it. Today, the button for submitting a form cannot be used, and it took a few hours. However, I finally got

blockE.printstacktrace ();}}}return list;}}-------------------------------------------------------------------------------------------------Set up a servlet class to get all the information in the database from the GetAll method inside the class Studentdao, and the function of forwarding the requestpublic class Listallstudent extends HttpServlet {Private static final long serialversionuid = 1L;protected void doget (HttpServletRequest request, httpser

. Such as.But I can't find the mistake there. The phrase is one or more entity validation failures, see Entity validation error properties. But this entity verification error how to find it. In fact, we can use the TR and catch in C # to catch this anomaly, and we know exactly where it went wrong. Such as. Because VS2015 is smart, huh. We can see the value when we move the mouse over it. Such as. We can find this error by pressing the hint. Because I'm still a rookie, huh? So there's something