mvc dropdownlist from database

The inspiration for this article comes from the Entity Framework of ASP. NET MVC 6, the official project Contoso University fictitious database in Microsoft MSDNThe original link is as follows;Https://docs.microsoft.com/en-us/aspnet/mvc/overview/getting-started/getting-started-with-ef-using-mvc/ Creating-an-entity-fram

when a team is developing a formal project because the add-migration command is a good place to track updates to the database structure and can be rolled back as appropriate. Updating the database automatically results in a change in the database structure, and if multiple people use the same database in the team's wo

Label:Use form validation in ASP. (The first thing to understand is that the validation logic should be added to the model, view, and Controller.) Since model is responsible for information access and business logic validation, we add the validation logic to the model. ）The first step: refer to the following namespaceStep Two: Add validationThe third step: Start debugging, the following problems occur:Workaround:The hyperlink contains a detailed description of the problem, which means that the E

total, respectively1. Filepathresult: Responding to an entity file2. Filecontentresult: Responds to the contents of a byte array3, Filestreamresult: response to a stream dataWhat is the difference between Filepathresult and Filestreamresult? What are we to choose? The main difference is that Filepathresult uses Httpresponse.transmitfile to write files to the HTTP output stream. This method does not buffer in server memory, so this is a good choice for sending large files. Their differences are

using DBHelper to implement query database function (1) Connect the MySQL database, if unable to connect, first open the MySQL service. Create a new database with the name text and create a new data table with the name user, add three fields: User ID, user name, and password. (2) Create a new Web project Usermanager, based on the

=request.getrequestdispatcher (tojsp); Rd.forward (requesT, response);} public void doget (HttpServletRequest request, httpservletresponse response) throws Servletexception, Ioexceptio n {doPost (request,response); }}Next is a JSP-written view that shows the page actionLogin Page login.jspLogin Success Page success.jspIf the login user name and password are not on the database, the login error page is displayed error.jspEnter user name Ming, passwo

The literal meaning is the model, so is this m just a class for writing data? Reply to discussion (solution) Whether M in MVC is a database operation classIs The following text is from the Baidu Encyclopedia moved over, suggested landlord to Baidu a bit.MVC is a pattern of creating WEB applications using MVC (Model View Controller-View-Controller) Design:

Label:1. Configure the connection string to configure multiple name="MetaSearchConnectionString" connectionString="Data Source=(local);Initial Catalog=MetaSearchDB;Persist Security Info=True;User ID=sa;Password=12345012345;Pooling=true;Min Pool Size=20;Max Pool Size=50000;" providerName="System.Data.SqlClient" /> 2. Add a data ModelSelect the connection string set in Webconfig, and the Entitie name below is the entity name to use3.the connection string in the

Used to the way to access the database ADO, although the code is not written by the EF simple, but it is not troublesome. And the way EF does a multi-table query is that EF needs to go through the database to define the foreign key, then go through the code generation, and then use the Include method to make multiple table association queries. I don't really like that, but I'd rather write a SQL statement.S

Feature Requirements: MVC project, Implementing database Backup (Bak file)Implementation steps: Method: 1, new class DatabaseMaintenance /// ///Database Maintenance/// Public classDatabaseMaintenance {/// ///backing up the database/// /// path to the backup file Public Stat

A small problem occurs when MVC is connected to the SQL Server database. As a website developer, using asp.net to develop a website is inconvenient to add function modules, so I started to learn about the mvc framework. Today is my first day of learning the mvc framework. The first step is to connect EF to the

MVC linq To SQL update database operations, mvclinq First, submit data in the view and use Html. BeginForm () @ Using (Html. BeginForm ()) { @ Html. EditorForModel () // edit the data transmitted from the template and Controller } Operations in the Controller [HttpPost] Public ActionResult Test (owner newowner) { Var owner = db. owner. Find (newowner. no ); Owner. name = newowner. name; // up

First, create a new class under the models directory (preferably with the same name as the new data table below)Writing mapped fields and database connection classesnamespacemyfristasp.models{ Public classMovie { Public intID {Get;Set; } Public stringTitle {Get;Set; } PublicDateTime ReleaseDate {Get;Set; } Public stringGenre {Get;Set; } Public decimalPrice {Get;Set; } } Public classMoviedbcontext:dbcontext { PublicDbsetGet;Set; } }}Ii. Adding

Original: ASP. NET MVC uses Petapoco Mini ORM framework +npgsql to drive connected PostgreSQL database Some time ago in the garden saw the small butterfly Jinghong released about the green version of the linux.net--"Jws.mono". Because I'm right. NET program is very interested in Linux, I also read some information about mono, but there is no time to take time to study this, the Small Butterfly Jing

instance. Controller class: usingModelfirst.models;usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingsystem.web;usingSYSTEM.WEB.MVC; namespaceModelfirst.controllers { Public classConputercontroller:controller {// //GET:/conputer/ PrivateModelfirstcomputer db =NewModelfirstcomputer (); PublicActionResult Index () {returnView (Db.ComputerInfo.ToList ()); } } } View class: @model ienumerable@{Viewbag.title="Index"; } @foreach (varIteminchModel) { @Html

The Entity Framework 4.1 supports code First programming mode: You can create a model class first, and then dynamically build the database under EF4.1 by configuration.Two scenarios are shown below:1, Code First mode, ASP. NET MVC data access2, traditional mode, first create the database and table, configure the connection string, and then generate the modelSteps

' tempdb ' database, the management scripts and stored procedures will remain in the "ASPState" database, if the machine starts, The session state will not be saved, which is also the default setting. P indicates that the data and status of the session state and the associated stored procedures will be placed in the SQL Server ' ASPState ' database; C means that

. NET MVC Connection data Local database three ways Configuration public class Homecontroller:controller {////GET:/home/public actionresult Index () {#re Gion Connect SQL function one SqlConnectionStringBuilder one = new SqlConnectionStringBuilder (); One. DataSource = "(local) \\sqlexpress"; One. InitialCatalog = "XSGL1"; One. UserID = "sa"; One. Password = "a123456"; On

Let's say that we want to record it with friends in the garden and ASP. net mvc uses the Petapoco micro-ORM framework + NpgSql driver to connect to the PostgreSQL database. This blog corresponds to a video. Since there is no time to record the video in a month, I have fulfilled my promise to my friends today .. The Directory of this video tutorial is video, code, and materials. There are 4 videos and the d

Well, for the friends in the garden. Record the video corresponding to the "ASP. NET MVC using Petapoco Mini ORM Framework +npgsql Drive Connection PostgreSQL database" This blog, because there is no time to record in one months, today I cashed the promise to my friends.This video tutorial directory for video, code, data, wherein the video has 4 paragraphs, the information is my collection of relevant infor