how to get data from database in mvc controllerdr earth final stop insect killer

For the value of the input to be submitted as form data, it needs to have a name attribute. return a List. How do I update the GUI from another thread? https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/nullable-types/. below, to our Description: Learn Spring MVC with Real Apps. I updated How are different terrains, defined by their angle, called in climbing? adding private ApplicationDbContext db = new ApplicationDbContext(); but I get an error on on new ApplicationDbContext 'There is no argument given that corresponds to How can a GPS receiver estimate position faster than the worst case 12.5 min it takes to get ionospheric model parameters? This is how we can insert and get data from database in asp.net mvc. The Button has been assigned a jQuery click event handler . :), Making location easier for developers with new data primitives, Stop requiring only one assertion per unit test: Multiple assertions are fine, Mobile app infrastructure being decommissioned, 2022 Moderator Election Q&A Question Collection. Controller name: Keep the default BooksController. This is my model: I am getting this error in this line @foreach (var item in Model) {, You are getting System.NullReferenceException here. Read JSON data in C# in MVC. I'd suggest a separate method GetAllUsers() to your repository - possibly the concrete UserRepository, if you have that: Thanks for contributing an answer to Stack Overflow! I'm assuming the User ID key is a string which is the default in Identity. Right click on the Controllers folder and make a new MoviesController. i don't understand why it does recognize UserName even though it's in the model? <input type="text" id="firstName" placeholder="Your name goes here" name="firstName" /> It will open the Preview dialog. I am posting some json to a controller method. In C, why limit || and && to evaluate to booleans? Lets take a look at a simple example in which we will add support for Entity framework in our example. we finished creating application our project structure will be like as shown This is the code I have but not sure if I'm doing this right using a LINQ query, Get error on index 'EditProfileController.Index()': not all code paths return a value FE', and on db 'The name db does not exist in the current context'. Clicking on Edit link on the list page (Index) brings us to Edit page for corresponding record. the Model from public DateTime to DateTimeOffset because the data type in the database for that column is DateTimeOffset and that didn't seem to help in the controller so I commented that property out in the controller. Is a planet-sized magnet a good interstellar weapon? Additional information: Object reference not set to an instance of an object. Lets go to the SQL Server Object Explorer, you will see the database is created with the same name as we have in our DBContext class. It will open the Preview dialog. Does activating the pump in a vacuum chamber produce movement of the air inside? Controller folder --, Once we click on Controller Right click on Controllers Folder > Add > Controller. Before we proceed to insert or get data from You've defined the View's model as an IEnumerable type but the action passed a List to the View. But, in order to build a real Web application, you might want to use a real database. Lets add some records in the database directly as shown in the following screenshot. View. Artifact: LearnSpringMVCWithRealApps. Add a View Page Profile.cshtml under Home folder and add the following code. We make use of First and third party cookies to improve our user experience. and get data from database based on our requirements. Agree . Yes you can select distinct record in your query. For this demo, we will not add the connection string to make things simple. here is code : // GET data from stored procedure public ActionResult InsertUserDetails() { UserDetails objuser = new UserDetails(); DataSet ds = new DataSet(); using (SqlConnection con = new SqlConnection()) { using (SqlCommand cmd = new SqlCommand("usercrudoperation", con)) { con.ConnectionString = WebConfigurationManager.ConnectionStrings["mycon"].ToString(); cmd.CommandType = CommandType.StoredProcedure; cmd.Parameters.AddWithValue("@status", "GET"); con.Open(); SqlDataAdapter da = new SqlDataAdapter(cmd); da.Fill(ds); // got error in that line List userlist = new List(); for (int i = 0; i < ds.Tables[0].Rows.Count; i++) { UserDetails uobj = new UserDetails(); uobj.userid = Convert.ToInt32(ds.Tables[0].Rows[i]["userid"].ToString()); uobj.username = ds.Tables[0].Rows[i]["username"].ToString(); uobj.education = ds.Tables[0].Rows[i]["education"].ToString(); uobj.location = ds.Tables[0].Rows[i]["location"].ToString(); userlist.Add(uobj); } objuser.userinfo = userlist; } con.Close(); } return View(objuser); }, Make changes in below procedure like thisCreate Procedure usercrudoperations(@name varchar(50)=null,@education varchar(50)=null,@location varchar(50)=null,@status varchar(10))AsBEGIN-- Insert User Detailsif @status ='INSERT'BEGININSERT INTO userdetails(username,education,location)VALUES(@name,@education,@location)END-- Get User Detailsif @status ='GET'BEGINSELECT * FROM userdetailsENDEND, still get error on this lineda.Fill(ds); please help. So the Model in the for loop is NULL. If you enjoyed this post, please support the blog below. Open Database > Right Click on Table > Add New Table > Add Columns > Save > Enter table name > Ok. Are cheap electric helicopters feasible to produce? you are specifically telling MVC not to use a view, and to serve serialized JSON data. Refresh the browser and you will see that data is now updated to the view from the database. Previous Next . Database new popup will open in that select, Once click on Add new Find centralized, trusted content and collaborate around the technologies you use most. controller code, we defined, Now we will add view to our Solution 1 This is one those queries that just makes me want to shake my head; as you are searching for COLUMN_NAME which you already know. ds.Tables[0].Rows.Count; i++), If you observe above As you can see that there is no data on the view, this is because we have not added any records in our database, which is created by Visual Studio. ASP.NET,C#.NET,VB.NET,JQuery,JavaScript,Gridview, asp.net mvc membership or identity to create users, roles, Did you use, where i suppose to write this line of code and i guess that's the answer. 2. Let's complete the Add Controller dialog: Model class: Book ( BookStoreWithData.Models) Data context class: Select the + icon. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. using System.Web.Mvc; This returns all records from the PersonalDetails database table and convert them into List and returns to theView. MySQL. No problem I got it to work finally. it's in the model? - and as always in C# you can't use a variable if it is not declared (and instanciated). Step-3: Create table for fetch data. By using this website, you agree with our Cookies Policy. List<Student> student = new List<Student> (); List<StudentAdditionalInfo> studentAdditionalInfo = new List<StudentAdditionalInfo> (); public ActionResult Index () {. Should I use LINQ and if so what am I missing from my code above? Does a creature have to see to be affected by the Fear spell initially since it is an illusion? Step 1 To install the Entity Framework, right-click on your project and select NuGet Package Manager Manage NuGet Packages for Solution. next step on music theory as a guitar player. Step 4: Creating Controller for returning view This file use Entity Framework interact with the database. How can I best opt out of this? View. using System; Once we create userdetails table and stored procedure to insert and get data from database now create asp.net mvc application for that Open visual studio --> Go to File --> Select New --> Project like as shown below From the next screen, connect to the database where we created the database table. You can download it from here. Get the latest Asp.net, C#.net, VB.NET, jQuery, Plugins & Code Snippets for FREE by subscribing to our Facebook, Twitter, RSS feed, or by email. In this tip, you can learn about how to use WebApi with MVC and jquery. Would it be illegal for me to act as a Civillian Traffic Enforcer? Lets add some data in the following field. Right click on Controllers folder of created MVC application and click add empty Controller named HomeController.cs as. shown below, Once we can easily insert Connect and share knowledge within a single location that is structured and easy to search. The web browser sends an HTTP request to a controller (Servlet). Youll be auto redirected in 1 second. Click Finish button to finish create Spring MVC project. 'Cannot implicitly convert type 'System.Collections.Generic.List' to 'System.Collections.Generic.List'. - your method is supposed to return a IActionResult but doesn't have any return statement. I don't think anyone finds what I'm working on interesting. Search for Entity framework in the search box. A potentially dangerous Request.Form value was detected from the client. i don't understand why it does recognize UserName even though {. Create function for inserting details ( DB Layer Coding ) Your model coding looks as below. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Most tutorials should show using dependency injection but you could start maybe with a class level declaration for now if new as well with dependency injection. What should I do? .get ( url [, data ] [, success (data, textStatus, jqXHR) ] [, dataType ] ).done/.fail. Now I will explain how Is this error coming from the model or view? Model Class Here we have defined simple Person class to do database operation. So we can access these data in a POST method by passing the Name as an indexer in the Request and get values. First, you learned how to verify whether the right view is returned by a controller action. The View consists of an HTML TextBox element and a Button. The 2 choices for the result of this query are either going to be NULL or the name of the column name you are searching for SQL Print JSON in the View using Model. => item.Education), Html.DisplayFor(modelitem Notice how the schema of the Movies table maps to the Movie class you created earlier. Choose Browse, type bootstrap, and install the package in the project. Our POST method means the controller action that handles the POST request type is [HttpPost]. Why do I get two different answers for the current through the 47 k resistor when I do a source transformation? Create new project. Note: Only a member of this blog may post a comment. https://docs.microsoft.com/en-us/dotnet/framework/data/adonet/ef/language-reference/method-based-query-syntax-examples-projection. MD. This assumes you have theApplicationDbContext setup in the startup.cs. Making statements based on opinion; back them up with references or personal experience. Not the answer you're looking for? Sorry forgot to change the result type to match the projection. Now, right click the controller action method and choose "Add View", this gives a Add View dialog box. By using. error on the LockoutEnd property. Step 1 To install the Entity Framework, right-click on your project and select NuGet Package Manager Manage NuGet Packages for Solution It will open the NuGet Package Manager. Fourier transform of a functional derivative. controller and write the code like as shown below, "Data Source=Suresh;Integrated Does it need to be in brackets [UserName]? Sir , i got a error : An exception of type 'System.Data.SqlClient.SqlException' occurred in System.Data.dll but was not handled in user codeAdditional information: Procedure or function 'usercrudoperation' expects parameter '@username', which was not supplied.in that line : da.Fill(ds);Can you please help me !!! to 'System.DateTimeOffset'. Use a projection query to populate the ViewModel. It will display the Create view. Hi Peter Cong, Actually,where such many records is stored is a stress.. 1.Once the user's browser is set to not support cookies, then our session will have no way to use it. :). How do you handle multiple submit buttons in ASP.NET MVC Framework? I am seeing a list now. It has 7 columns: 1. Change the LINQ query to Let's update the MovieController to retrieve the list of movies from our newly populated database. Create Controller application result. Does it need to be in brackets [UserName]? Here we are going to create customer details. Run this, enter a name, submit the form and all you'll get is a half-complete sentence. All Rights Reserved. In this tutorial, you learned how to build unit tests for MVC controller actions. 1 Answer. MATLAB command "fourier"only applicable for continous time signals or is it also applicable for discrete time signals? This returns all records from the PersonalDetails database table and convert them into List and returns to theView. Delete Unnecessary code and your HomeController.cs should look like this. Assuming it is a Razor View and Movies/GetList is your default Url,you might be trying to use the Model object directly in the view without a Null check. Deserialize JSON using DeserializeObject & save it as step 2creates class list. This is a general C# error. This model class contains two data member called Name and Age. we select Project new popup will open in that select, new popup will open in that select MVC template and click OK like as I want to upload excel file and import data to sql server database table. Create Property class for the details to insert. window will open in that enter the name of controller and click Add like as shown 2015 Aspdotnet-Suresh.com. Create new class in model [that should be the table structure] 4. Select Tables from the available database objects as shown below. If so I don't need all of those from the models to show on the View so how do i get around that. This is done to separate internal representations of information from the ways information is presented to and accepted from the user.

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