#

 

 

Wie bindet man eine bestehende Datenbank an ein neues ASP Core MVC Projekt an?

in Visual Studio

 

Schritt 1: in Visual Studio den Datenbank Server anbinden

In Menü->Views->Server Explorer anzeigen

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Dann Datenverbindungen->Verbindung hinzufügen->Servername: .\localdb

Mit Datenbank verbinden->Datenbank auswählen

 

Schritt 2: im SQL Server Explorer die Datenverbindung für die Datenbank entnehmen

Unter Datenbank->Properties->Connection->Connectionstring

 

Connection String in startup.cs

 In Asp Core MVC die Connectionstring einfügen

In die Datei Startup.cs ->Configure Services

services.AddDbContext<ApplicationDbContext>(options =>options.UseSqlServer("Data Source=.\\localdb;Initial Catalog=Demo;Integrated Security=True"));

 

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Tabellen Struktur aus SQL Server entnehmen

Dann die Tabelle im SQL Server zur Design-Ansicht  öffnen und die Tabellen-Felder mit Feldtyp anzeigen

 

CREATE TABLE [dbo].[tblProdDates] (

    [IDProduct]   INT  NOT NULL,

    [Date_Product] DATE NOT NULL,

    CONSTRAINT [PK_tblProdDates] PRIMARY KEY CLUSTERED ([IDProduct] ASC, [Date_Product] ASC)

);

 

 

Model Klasse in Asp Core Projekt erstellen

Die Daten Model Klasse erstellt man unter:

 

Startup.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Threading.Tasks;

using Microsoft.AspNetCore.Builder;

using Microsoft.AspNetCore.Hosting;

using Microsoft.Extensions.Configuration;

using Microsoft.Extensions.DependencyInjection;

using Microsoft.Extensions.Hosting;

using MyApp.Models.DBContext;

using Microsoft.EntityFrameworkCore;

 

namespace MyApp

{

    public class Startup

    {

        public Startup(IConfiguration configuration)

        {

            Configuration = configuration;

        }

 

        public IConfiguration Configuration { get; }

 

 

 

 

        // This method gets called by the runtime. Use this method to add services to the container.

        public void ConfigureServices(IServiceCollection services)

        {

            // Add framework services.

            services

                .AddControllersWithViews()

                .AddJsonOptions(options => options.JsonSerializerOptions.PropertyNamingPolicy = null);

           

            services.AddDbContext<ApplicationDbContext>(options =>options.UseSqlServer("Data Source=.\\localdb;Initial Catalog=Demo;Integrated Security=True"));

 

        }

 

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.

        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)

        {

            if (env.IsDevelopment())

            {

                app.UseDeveloperExceptionPage();

            }

            else

            {

                app.UseExceptionHandler("/Home/Error");

            }

            app.UseStaticFiles();

 

            app.UseRouting();

 

            app.UseAuthorization();

 

            app.UseEndpoints(endpoints => {

                endpoints.MapControllerRoute(

                    name: "default",

                    pattern: "{controller=Demo}/{action=Index}");               

            });

        }

    }

}

 

 

 

Model Class

Data-Definition of Table

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using System;

using System.Collections.Generic;

using System.ComponentModel.DataAnnotations;

using System.Linq;

using System.Threading.Tasks;

 

namespace MyApp.Models

{

    public class ProductDateModel

    {

        [Key]

        public long IDProduct { get; set; }

        public DateTime Date_Product { get; set; }

    }

}

 

 

Erweiterung der Model Klasse mit PrimaryKey

Cs0246 The type or namespace name "KeyAttribute" could not be found (are you missing directive or an assembly reference)?

 

using System.ComponentModel.DataAnnotations;

 

 

 

AppplicationDbContext.cs

 

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using System;

using System.Collections.Generic;

using System.Linq;

using System.Threading.Tasks;

//< Using>

using Microsoft.EntityFrameworkCore;

//</ Using>

 

namespace MyApp.Models.DBContext

{

    public class ApplicationDbContext : DbContext

    {

 

        public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options): base(options){ }

 

        #region EF: Datase-Tabels to Models

        //------------< region: Datase-Tables to Models >------------

        public DbSet<Models.ProductDateModel> tbl_ProductDates{ get; set; }

 

 

        protected override void OnModelCreating(ModelBuilder modelBuilder)

        {

            base.OnModelCreating(modelBuilder);

            modelBuilder.Entity<Models.ProductDateModel>().ToTable("tbl_ProductDates");

        }

        //------------</ region : Datase-Tables to Models >------------

        #endregion /EF: Datase-Tabels to Models

    }

}

 

 

 

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