ASP.NET 核心 3.1：将存储过程与视图模型一起使用

Question

下面的代码用于运行存储过程和 return 值（行）到 var ReturnedRowsFromSP:

var recordValue = new SqlParameter("@thisRecordValue", RecordValueFromInput);

var ReturnedRowsFromSP = _context.ReturnedRowsTableExistsInDB.FromSqlRaw("exec sp_MySpReturnsManyRows @thisRecordValue", recordValue)
                                 .AsNoTracking().ToList();

我的问题是，我需要创建一个 class，进行迁移并将 table (ReturnedRowsTableExistsInDB) 添加到数据库中，以便使用存储过程和class 需要与存储过程中的 returned 列完全相同。

有没有什么方法可以将存储过程与 table（不是在数据库中创建的）或视图模型一起使用，甚至可以将（存储过程的）结果传递给 ViewBag或 ViewData?

非常感谢

Answer 1

您可以将 viewmodel 定义为 DbContext class 中的 DbSet 并忽略创建 table。试试吧

public class DbContext : DbContext
{
    public DbSet<StoredProcedureViewModel> spVM { get; set; }

    protected override void OnModelCreating(ModelBuilder builder)
    {
        builder.Ignore<StoredProcedureViewModel>();
    }
}

注意 : 在OnModelCreating中你可以忽略class或DbSet创建数据库Table.

Answer 2

您可以参考以下步骤使用EF core查询存储过程（无需为存储过程结果创建table）。

在 SQL 服务器数据库中创建存储过程：

 CREATE PROCEDURE sp_GetBookAuthors @bookname nvarchar(250)
 AS

 select b.Id, b.BookName, a.AuthorName, b.ISBN from Authors as a 
          join BookAuthors as ba 
          on a.Id = ba.AuthorId 
          join Books as b 
          on ba.BookId = b.Id
          where b.BookName = @bookname

根据查询结果创建如下ViewModel：

 public class BookAuthorViewModel
 {
     [Key]
     public int Id { get; set; }
     public string BookName { get; set; }
     public string AuthorName { get; set; }
     public string ISBN { get; set; }
 }

在数据库上下文 OnModelCreating 方法中注册存储过程：

 public class WebApplication2Context : IdentityDbContext<WebApplication2User>
 { 
     public DbSet<Book> Books { get; set; }
     public DbSet<Author> Authors { get; set; }
     public DbSet<BookAuthor> BookAuthors { get; set; } 

     public WebApplication2Context(DbContextOptions<WebApplication2Context> options)
         : base(options)
     {
     }

     protected override void OnModelCreating(ModelBuilder builder)
     {
         base.OnModelCreating(builder);
         builder.Entity<BookAuthor>().HasKey(sc => new { sc.AuthorId, sc.BookId });

         #pragma warning disable CS0618 // Type or member is obsolete
         builder.Ignore<BookAuthorViewModel>(); //ignore create the table for the stored procedure
         builder.Query<BookAuthorViewModel>();  //register stored procedure.
         #pragma warning restore CS0618 // Type or member is obsolete
     }

     //create a method for the stored procedure.
     public List<BookAuthorViewModel> GetBookAuthors(string sqlQuery)
     {
         // Initialization.  
         List<BookAuthorViewModel> lst = new List<BookAuthorViewModel>();

         try
         { 
             #pragma warning disable CS0618 // Type or member is obsolete
             lst = this.Query<BookAuthorViewModel>().FromSqlRaw<BookAuthorViewModel>(sqlQuery).ToList();
             #pragma warning restore CS0618 // Type or member is obsolete
         }
         catch (Exception ex)
         {
             throw ex;
         }
         // Info.  
         return lst;
     }
 }

从控制器操作方法调用存储过程方法：

 public class HomeController : Controller
 {
     private readonly ILogger<HomeController> _logger;
     private readonly WebApplication2Context _dbcontext;

     public HomeController(ILogger<HomeController> logger, WebApplication2Context context)
     {
         _logger = logger;
         _dbcontext = context;
     }

     public IActionResult BookAuthorIndex()
     { 
         // Processing.  
         string sqlQuery = "execute sp_GetBookAuthors @bookname = 'Book A'";
         var result = _dbcontext.GetBookAuthors(sqlQuery);
         return View(result);
     }

结果如下：

ASP.NET 核心 3.1：将存储过程与视图模型一起使用

ASP.NET Core 3.1 : using stored procedures with view model

asp.net-core

stored-procedures

viewmodel

viewbag