below is my code
I am trying to pull data from database using entityframework.
EmployeeDataContext class -
namespace _09032020_1.Models
{
public class EmployeeDataContext : DbContext
{
public DbSet<Employee> Employees { get; set; }
}
}
Employee model -
namespace _09032020_1.Models
{
[Table("TbleEmployee")]
public class Employee
{
public int employeeId { get; set; }
public string employeeName { get; set; }
public string employeeCity { get; set; }
public string employeeGender { get; set; }
public int departmentId { get; set; }
}
}
below are the table columns.
here is the controller code
namespace _09032020_1.Controllers
{
public class EmployeeController : Controller
{
public ActionResult Index()
{
EmployeeDataContext employeeDataContext = new EmployeeDataContext();
Employee employee = new Employee();
List<Employee> employees1 = new List<Employee>();
employees1 = employeeDataContext.Employees.ToList();
return View(employees1);
}
}
}
I am not getting data inside employeeDataContext
Please let me know if more info regarding config file requires.
Create the table w data. The first column is primary key and identity.
In an MVC project (you can use another type, also I am showing database first, and you can use another type, right click on the Models folder and add ADO.NET Entity Data Model named EmployeeDataContext. Choose EF Designer from database. New connection, and choose your db. Save connection as EmployeeDataContext and choose your table.
Put this in your code:
using (EmployeeDataContext context = new EmployeeDataContext())
{
var emps = context.Employees.ToList();
}
I got my answer,
I have written wrong table name as model attribute [Table("TbleEmployee")]
My table name is TblEmplyee. So it should be [Table("TblEmployee")]
As I changed this I abled to proceed forward.
I have smaller separate models I don't want to map to SQL Server database table. Is it possible to use them as properties of an object that's mapped to SQL Server table?
I know SQL Server is relational, but of a case where I don't to map these separate models to database table? I have done it several times with non relational databases like MongoDb.
Here is and example what I want to achieve
The DbContext class:
public class ApplicationDbContext: DbContext
{
....
public DbSet<User> Users {get; set;}
}
User class:
public class User
{
public Guid Id { get; set; }
public string Name { get; set; }
public string Email { get; set; }
public LoginProfile LoginProfile { get; set; }
}
LoginProfile class:
public class LoginProfile
{
public string Username { get; set; }
public string Password { get; set; }
}
In the above example User model class is the only one I want to have as table in my database. Is it possible to do that, and do things like
var password = user.LoginProfile.Password;
user.LoginProfile.username = "username";
When I see at other sample projects, the number of tables created for supporting Identity in the db is great (such ones as AspNetRoles, AspNetUserClaims, etc..), but in my case when I make the migration and the update only the User table has been created. What is the reason?
Here is my code in the startup, in the dbcontext and my class user:
public void ConfigureServices(IServiceCollection services)
{
services.AddMvc();
services.AddSession();
services.AddMemoryCache();
services.AddDbContext<ApplicationDbContext>( options =>
options.UseSqlServer(Configuration["Data:photoarchiver:ConnString"]));
services.AddIdentity<User, IdentityRole > (
opts => {
opts.Password.RequireDigit = false;
opts.Password.RequiredLength = 7;
opts.Password.RequireLowercase = true;
opts.Password.RequireUppercase = false;
opts.Password.RequireNonAlphanumeric = false;
}).AddEntityFrameworkStores<ApplicationDbContext>();
}
Class DbContext:
public class ApplicationDbContext : DbContext
{
public ApplicationDbContext(DbContextOptions options) : base(options)
{
}
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.Entity<User>().ToTable("Users");
modelBuilder.Entity<User>().HasMany(u => u.Photos).WithOne(i => i.User);
modelBuilder.Entity<Photo>().ToTable("Photos");
modelBuilder.Entity<Photo>().HasOne(i => i.User).WithMany(u => u.Photos);
modelBuilder.Entity<Category>().ToTable("Categories");
}
public DbSet<Photo> Photos { get; set; }
public DbSet<Category> Categories { get; set; }
}
Class User:
public class User : IdentityUser
{
public virtual List<Photo> Photos { get; set; }
[Required]
public string DisplayName { get; set; }
public string Notes { get; set; }
[Required]
public DateTime CreatedDate { get; set; }
}
To get all the AspNetRoles, etc tables "for free" you need to change your ApplicationDbContext to extend from IdentityDbContext<User> instead of just DbContext. IdentityDbContext<T> is found in the Microsoft.AspNetCore.Identity.EntityFrameworkCore namespace. You can see from the source code https://github.com/aspnet/Identity/blob/master/src/EF/IdentityDbContext.cs, IdentityDbContext will bring in the required DbSetproperties.
As you correctly identified in the comment to your question, you will need to call base.OnModelCreating(builder) and re-make your migration files.
I have a question that deals with the logistics of returning rows of data in a SQL database (Entity Framework) based on the user that is logged in; I have mainly focused on desktop C# applications and while making the switch to ASP.NET MVC 4 I'm having a bit of difficulty when it comes to figuring this out (I've searched around and none of the answers seem to provide exactly what I'm looking for):
I would like to use the authorization built in to ASP.NET (MVC4), and allow users to post data about their websites (site category, url, age, etc.) with a form, and have the form store the data (using Entity Framework) to a database (called PrimaryDomainsDb) that is tied to their Id in the UserProfile table.
When the user clicks a button to show their list of domains, how can I make the application pull their list of domains (relevant rows of data) while ignoring other users rows?
Again, I'm mainly looking for the logistics and concepts (using foreign keys, for example) and psuedocode rather than actually spoonfeeding me a bunch of code.
If anyone has any best practice ideas (i.e. link the UserProfile to the PrimaryDomainDb this way, and use EF to call the rows matching their Id this way to return the rows to the View), it would be much appreciated.
Some sample code:
I currently have my PrimaryDomain code first set up like this (this doesn't have the decorators that specify min/max length, etc.):
public class PrimaryDomain
{
public virtual int Id { get; set; }
public virtual string SiteName { get; set; }
public virtual string SiteURL { get; set; }
public virtual SitePlatforms SitePlatform { get; set; }
public virtual decimal? SiteDA { get; set; }
public virtual decimal? SitePA { get; set; }
public virtual string SiteAge { get; set; }
public virtual DateTime? LastStatusUpdate { get; set; }
public virtual string SiteIP { get; set; }
}
And I have a User class that is different than the one provided by ASP.NET WebSecurity, that looks like this: (also, I know that "password" should not be in string formatting, this is just for initial set-up purposes - and password should probably be removed altogether and handled by WebSecurity, I think).
public class User
{
public virtual int Id { get; set; }
public virtual string Username { get; set; }
public virtual string Password { get; set; }
public virtual string Email { get; set; }
public virtual string FirstName { get; set; }
public virtual string LastName { get; set; }
public virtual string MozAccessID { get; set; }
public virtual string MozKey { get; set; }
public virtual decimal AccuountBalance { get; set; }
public virtual PrivateProxy PrivateProxies { get; set; }
public virtual PrimaryDomain PrimaryDomains { get; set; }
}
When pulling the data for Views I run everything through a repository using direct injection:
public interface IUserDataSource
{
IQueryable<User> Users { get; }
IQueryable<PrimaryDomain> PrimaryDomains { get; }
void Save();
}
This is my UserDb class, which is fed in whenever the code calls for an IUserDataSource (via direct injection):
public class UserDb : DbContext, IUserDataSource
{
public UserDb()
: base("DefaultConnection")
{
}
public DbSet<User> Users { get; set; }
public DbSet<PrimaryDomain> PrimaryDomains { get; set; }
IQueryable<User> IUserDataSource.Users
{
get { return Users; }
}
IQueryable<PrimaryDomain> IUserDataSource.PrimaryDomains
{
get { return PrimaryDomains; }
}
void IUserDataSource.Save()
{
SaveChanges();
}
}
And this is, for example, how I would pass the PrimaryDomains model to the View:
public class NetworkController : Controller
{
//
// GET: /Network/
private IUserDataSource _db;
public NetworkController(IUserDataSource db)
{
_db = db;
}
public ActionResult ListDomains()
{
var allDomains = _db.PrimaryDomains;
return View(allDomains);
}
}
But instead of pulling the entire PrimaryDomains list from the data source, I would like to add a way to reference the currently logged in user id to make the application only show the domains for that specific user, not all domains, and when adding a new domain via the form to reference the User Id and add it into the table as well.
My original question may have caused some confusion as to what I'm trying to achieve; It's my fault for posing the wrong way of going about what I'm trying to do. After much research and learning, I've found that exactly what I'm looking for is a multi-tenant data architecture approach.
This is probably what you are looking for. If I understood you correctly you want to use WebSecurity to login or register users but you want to use entity framework to store some user-specific data. Code below connects WebSecurity tables with your database CodeFirst created using EntityFramework.
You create class below (from tutorial).
[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = false, Inherited = true)]
public sealed class InitializeSimpleMembershipAttribute : ActionFilterAttribute
{
private static SimpleMembershipInitializer _initializer;
private static object _initializerLock = new object();
private static bool _isInitialized;
public override void OnActionExecuting(ActionExecutingContext filterContext)
{
// Ensure ASP.NET Simple Membership is initialized only once per app start
LazyInitializer.EnsureInitialized(ref _initializer, ref _isInitialized, ref _initializerLock);
}
private class SimpleMembershipInitializer
{
public SimpleMembershipInitializer()
{
try
{
if(!WebSecurity.Initialized)
WebSecurity.InitializeDatabaseConnection("ConnectionString", "DbUsers", "UserId", "Email", autoCreateTables: true);
}
catch (Exception ex)
{
throw new InvalidOperationException("The ASP.NET Simple Membership database could not be initialized. For more information, please see http://go.microsoft.com/fwlink/?LinkId=256588", ex);
}
}
}
}
It creates necessary tables for registering and logging your users. The magic is in second, third and fourth parameter. It is respectively table, userId column and userName column from YOUR database that you can create by EntityFramework. WebSecurity uses that table along with other self-generated tables to manage your users and let them register, login and so on.
Then in your code first you simply create table
public class DbUser
{
[Key]
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int UserId { get; set; }
[MaxLength(40)]
public string Email { get; set; }
[MinLength(3)]
[MaxLength(30)]
[Required]
public string FirstName { get; set; }
[MinLength(3)]
[MaxLength(50)]
[Required]
public string LastName { get; set; }
}
Then you can simply query data from controller. In example below I use UserId stored by WebSecurity membership to retrieve account info from database.
public ActionResult AccountInfo()
{
if (FormsAuthentication.CookiesSupported == true && Request.Cookies[FormsAuthentication.FormsCookieName] != null)
{
var userId = WebSecurity.CurrentUserId;
var userInfo = context.Users.FirstOrDefault(x => x.UserId == userId);
userInfo.Password = "";
return View(userInfo);
}
else
{
ModelState.AddModelError("", "Wystąpił bląd autoryzacji, zaloguj się jeszcze raz.");
return RedirectToAction("Login", "Account");
}
}
EDIT:
Regarding your edited question as I understand besides the fact that you need to integrate WebSecurity with EF as above (I also forgot to mention that after creating InitializeSimpleMmebershipAttribute class as above you need to decorate your controller with that attribute) you also have problems with implementing generic repository. If that line is a problem:
var allDomains = _db.PrimaryDomains;
Then i suggest to read this article about implementing generic repository:
http://www.asp.net/mvc/tutorials/getting-started-with-ef-using-mvc/implementing-the-repository-and-unit-of-work-patterns-in-an-asp-net-mvc-application
If you want thing realy simple all you need is just add to your interface method
GetDomainByUserId(int userId)
and just implement that interface like that:
public class UserDb : DbContext, IUserDataSource
{
public UserDb()
: base("DefaultConnection")
{
}
public DbSet<User> Users { get; set; }
public DbSet<PrimaryDomain> PrimaryDomains { get; set; }
IQueryable<User> IUserDataSource.Users
{
get { return Users; }
}
IQueryable<PrimaryDomain> IUserDataSource.PrimaryDomains
{
get { return PrimaryDomains; }
}
IQueryable<PrimaryDomain> GetDomainByUserId(int userId)
{
return PrimaryDomains.Where(x => x.Id == userId).ToQueryable();
}
void IUserDataSource.Save()
{
SaveChanges();
}
}
But this is very bad approach and I strongly recommend reading that article.
I created a model class, ClassOne, for my database as follows
public class ClassOne
{
[Key]
public int primary { get; set; }
public string column1 { get; set; }
public string column2 { get; set; }
public string column3 { get; set; }
}
Then in a DAL folder I created, i added the following code
public class MyContext : DbContext
{
public DbSet<ClassOne> ClassOnes { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();
}
}
And I set up my connection string in my web.config
Instead of adding a controller for the model ClassOne, I want to access the data from my project's home controller file, in the index method. So I added the code
private ProjectContext db = new ProjectContext();
Hand my index method return statement is
return(db.ClassOnes.ToList());
However, when I run the code, I get the following error message:
There is already an object named 'ClassOne' in the database.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.Data.SqlClient.SqlException: There is already an object named 'ClassOne' in the database.
ANd it points to my return statement in the homecontroller.cs file:
return(db.ClassOnes.ToList());
How can I fix this please?