C# .NET MVC Inserting a record with primary key

C# .NET MVC Inserting a record with primary key

When working with a .NET MVC application and inserting a record with a primary key, you typically use an Object-Relational Mapping (ORM) framework like Entity Framework to handle the database interactions. Entity Framework abstracts the database operations and allows you to work with C# objects instead of writing raw SQL queries.

Here's a step-by-step guide on how to insert a record with a primary key using Entity Framework in a .NET MVC application:

  • Install Entity Framework:

    • If you haven't already, install Entity Framework using NuGet Package Manager in your project. You can do this by running the following command in the Package Manager Console:
    Install-Package EntityFramework

  • Define Your Model Class:

    • Create a C# class that represents the entity (table) in your database. Include the primary key property in your model.
using System.ComponentModel.DataAnnotations; public class Product { [Key] public int ProductId { get; set; } public string Name { get; set; } public decimal Price { get; set; } }
  • Create a Database Context Class:
    • Create a class that inherits from DbContext to define the database context and include a DbSet property for your model.
using System.Data.Entity; public class ApplicationDbContext : DbContext { public DbSet<Product> Products { get; set; } }
  • Configure Connection String:
    • Add a connection string to your application's configuration file (e.g., Web.config or App.config). Specify the connection string for your database.
<connectionStrings> <add name="DefaultConnection" connectionString="YourConnectionString" providerName="System.Data.SqlClient" /> </connectionStrings>
  • Insert a Record:
    • In your controller or service, create an instance of the ApplicationDbContext and use it to insert a record into the database.
public class ProductController : Controller { public ActionResult Create() { // Create an instance of the database context using (var db = new ApplicationDbContext()) { // Create a new product object with primary key and other properties var newProduct = new Product { ProductId = 1, // The primary key value you want to set Name = "New Product", Price = 9.99m }; // Add the new product to the Products DbSet db.Products.Add(newProduct); // Save changes to the database db.SaveChanges(); } // Redirect to a view or return a response return View(); } }

That's it! The new record with the specified primary key value will be inserted into the database. Note that if you are using auto-generated primary keys (e.g., identity columns in SQL Server), you can omit setting the primary key value, and the database will generate it for you upon insertion.

Examples

  1. "C# .NET MVC Insert Record with Auto-Incremented Primary Key"

    // Code in Controller public ActionResult AddItem(Item newItem) { if (ModelState.IsValid) { // Assuming 'Id' is an auto-incremented primary key db.Items.Add(newItem); db.SaveChanges(); return RedirectToAction("Index"); } return View(newItem); }

    Description: Inserts a record into the database using Entity Framework in an MVC application, assuming the primary key (Id) is auto-incremented.

  2. "C# .NET MVC Insert Record with Specified Primary Key Value"

    // Code in Controller public ActionResult AddItem(Item newItem) { if (ModelState.IsValid) { // Assuming 'Id' is a manually specified primary key value db.Items.Add(newItem); db.SaveChanges(); return RedirectToAction("Index"); } return View(newItem); }

    Description: Inserts a record into the database using Entity Framework in an MVC application, assuming the primary key (Id) is manually specified.

  3. "C# .NET MVC Insert Record with Guid as Primary Key"

    // Code in Controller public ActionResult AddItem(Item newItem) { if (ModelState.IsValid) { // Assuming 'Id' is a Guid primary key newItem.Id = Guid.NewGuid(); db.Items.Add(newItem); db.SaveChanges(); return RedirectToAction("Index"); } return View(newItem); }

    Description: Inserts a record into the database using Entity Framework in an MVC application, where the primary key (Id) is a Guid.

  4. "C# .NET MVC Insert Record with Identity Insert Enabled"

    // Code in Controller [HttpPost] [ValidateAntiForgeryToken] public ActionResult AddItem(Item newItem) { if (ModelState.IsValid) { // Assuming 'Id' is an identity column and identity insert is enabled db.Database.ExecuteSqlCommand("SET IDENTITY_INSERT dbo.Items ON"); db.Items.Add(newItem); db.SaveChanges(); db.Database.ExecuteSqlCommand("SET IDENTITY_INSERT dbo.Items OFF"); return RedirectToAction("Index"); } return View(newItem); }

    Description: Inserts a record into the database using Entity Framework in an MVC application, with identity insert temporarily enabled.

  5. "C# .NET MVC Insert Record with Composite Primary Key"

    // Code in Controller public ActionResult AddItem(Item newItem) { if (ModelState.IsValid) { // Assuming 'ItemId' and 'CategoryId' together form a composite primary key db.Items.Add(newItem); db.SaveChanges(); return RedirectToAction("Index"); } return View(newItem); }

    Description: Inserts a record into the database using Entity Framework in an MVC application, with a composite primary key (ItemId and CategoryId).

  6. "C# .NET MVC Insert Record with SQL Insert Statement"

    // Code in Controller public ActionResult AddItem(Item newItem) { if (ModelState.IsValid) { // Assuming 'Id' is an auto-incremented primary key db.Database.ExecuteSqlCommand($"INSERT INTO Items (Name, Description) VALUES ('{newItem.Name}', '{newItem.Description}')"); return RedirectToAction("Index"); } return View(newItem); }

    Description: Inserts a record into the database using a raw SQL insert statement in an MVC application.

  7. "C# .NET MVC Insert Record and Return Inserted Record"

    // Code in Controller public ActionResult AddItem(Item newItem) { if (ModelState.IsValid) { // Assuming 'Id' is an auto-incremented primary key db.Items.Add(newItem); db.SaveChanges(); // Access the inserted record var insertedItem = db.Items.Find(newItem.Id); return View("Details", insertedItem); } return View(newItem); }

    Description: Inserts a record into the database using Entity Framework in an MVC application and returns the inserted record for further processing.

  8. "C# .NET MVC Insert Record with Custom Primary Key Generation"

    // Code in Controller public ActionResult AddItem(Item newItem) { if (ModelState.IsValid) { // Custom logic for generating primary key newItem.Id = GenerateCustomPrimaryKey(); db.Items.Add(newItem); db.SaveChanges(); return RedirectToAction("Index"); } return View(newItem); } private int GenerateCustomPrimaryKey() { // Custom logic to generate a unique primary key return /* logic to generate key */; }

    Description: Inserts a record into the database using Entity Framework in an MVC application with custom logic for generating the primary key.

  9. "C# .NET MVC Insert Record with Identity Column"

    // Code in Model [Key] [DatabaseGenerated(DatabaseGeneratedOption.Identity)] public int Id { get; set; } // Code in Controller public ActionResult AddItem(Item newItem) { if (ModelState.IsValid) { // Assuming 'Id' is an identity column db.Items.Add(newItem); db.SaveChanges(); return RedirectToAction("Index"); } return View(newItem); }

    Description: Configures the primary key property with [DatabaseGenerated(DatabaseGeneratedOption.Identity)] for an identity column in an MVC application.

  10. "C# .NET MVC Insert Record with Default Primary Key"

    // Code in Model [Key] [DatabaseGenerated(DatabaseGeneratedOption.None)] public int Id { get; set; } // Code in Controller public ActionResult AddItem(Item newItem) { if (ModelState.IsValid) { // Assuming 'Id' is not auto-generated db.Items.Add(newItem); db.SaveChanges(); return RedirectToAction("Index"); } return View(newItem); }

    Description: Configures the primary key property with [DatabaseGenerated(DatabaseGeneratedOption.None)] for a non-auto-generated primary key in an MVC application.

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