在 EF Core 中执行存储过程，从 JOIN 返回 int。 blazor(客户端)

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Execute stored procedure in EF Core returning int from JOIN. blazor(client-side)

如何在 EF Core 中获取从 SQL Server 中的存储过程返回的 int 值？

--Two tables, Employee and AspNetUsers--

CREATE PROCEDURE SP_GetIdEmployeeByUserName

  (@username varchar(100), @idemployee int output)

AS

BEGIN

  SELECT @idemployee = (SELECT e.Id 

             FROM Employee e

             JOIN AspNetUsers a ON e.IdUser = a.Id

             WHERE a.Email = @username)



END



--Executing in database--

DECLARE @idemp INT;

EXEC SP_GetIdEmployeeByUserName 'someinsertedemail@gmail.com', @idemp output

SELECT @idemp;
idemp `Id = 40`
[HttpGet]

[Route("getbyname")]

public int GetByName([FromQuery] string username)

{

    try

    {

      if (!string.IsNullOrEmpty(username))

      {

        SqlParameter paramUsername = new SqlParameter("@username", username);



        var paramOut = new SqlParameter

        {

          ParameterName ="@idemp",

          SqlDbType = System.Data.SqlDbType.Int,

          Direction = System.Data.ParameterDirection.Output,

        };



        var result = _context

          .Employee.FromSqlRaw

          ($"EXEC SP_GetIdFuncByUserName @username, @idemp OUTPUT", paramUsername, paramOut)

          .FirstOrDefault();



        Console.WriteLine("result = >>>>>>>>>" + result);



        return result.Id;

      }

      else

      {

        return 0;

      }



    }

    catch (Exception ex)

    {

      Console.WriteLine("ex ->" + ex);

      throw;

    }

  }

var result = _context

        .Database.ExecuteSqlRaw

        ($"EXEC SP_GetIdFuncByUserName @username, @idemp OUTPUT", paramUsername, paramOut);
_context.Database.ExecuteSqlCommand if obsolete
SELECT [Generated Column Names] FROM 

(

  @YOURQUERY

)

var result = _context

      .Database.ExecuteSqlRaw

      ($"EXEC SP_GetIdFuncByUserName @username, @count OUTPUT", paramUsername, paramOut);

var result = _context

        .Database.ExecuteSqlRaw

        ($"EXEC SP_GetIdFuncByUserName @username, @idemp OUTPUT", paramUsername, paramOut);

var employeeId = paramOut.Value;

var employee = _context.Employee.FirstOrDefault(e => e.Id == employeeId);

在 SQL Server 测试中返回正确的 Employee.Id

--Two tables, Employee and AspNetUsers--

CREATE PROCEDURE SP_GetIdEmployeeByUserName

  (@username varchar(100), @idemployee int output)

AS

BEGIN

  SELECT @idemployee = (SELECT e.Id 

             FROM Employee e

             JOIN AspNetUsers a ON e.IdUser = a.Id

             WHERE a.Email = @username)



END



--Executing in database--

DECLARE @idemp INT;

EXEC SP_GetIdEmployeeByUserName 'someinsertedemail@gmail.com', @idemp output

SELECT @idemp;
idemp `Id = 40`
[HttpGet]

[Route("getbyname")]

public int GetByName([FromQuery] string username)

{

    try

    {

      if (!string.IsNullOrEmpty(username))

      {

        SqlParameter paramUsername = new SqlParameter("@username", username);



        var paramOut = new SqlParameter

        {

          ParameterName ="@idemp",

          SqlDbType = System.Data.SqlDbType.Int,

          Direction = System.Data.ParameterDirection.Output,

        };



        var result = _context

          .Employee.FromSqlRaw

          ($"EXEC SP_GetIdFuncByUserName @username, @idemp OUTPUT", paramUsername, paramOut)

          .FirstOrDefault();



        Console.WriteLine("result = >>>>>>>>>" + result);



        return result.Id;

      }

      else

      {

        return 0;

      }



    }

    catch (Exception ex)

    {

      Console.WriteLine("ex ->" + ex);

      throw;

    }

  }

var result = _context

        .Database.ExecuteSqlRaw

        ($"EXEC SP_GetIdFuncByUserName @username, @idemp OUTPUT", paramUsername, paramOut);
_context.Database.ExecuteSqlCommand if obsolete
SELECT [Generated Column Names] FROM 

(

  @YOURQUERY

)

var result = _context

      .Database.ExecuteSqlRaw

      ($"EXEC SP_GetIdFuncByUserName @username, @count OUTPUT", paramUsername, paramOut);

var result = _context

        .Database.ExecuteSqlRaw

        ($"EXEC SP_GetIdFuncByUserName @username, @idemp OUTPUT", paramUsername, paramOut);

var employeeId = paramOut.Value;

var employee = _context.Employee.FirstOrDefault(e => e.Id == employeeId);

现在在 Blazor(客户端)控制器中，我正在尝试执行存储过程。

--Two tables, Employee and AspNetUsers--

CREATE PROCEDURE SP_GetIdEmployeeByUserName

  (@username varchar(100), @idemployee int output)

AS

BEGIN

  SELECT @idemployee = (SELECT e.Id 

             FROM Employee e

             JOIN AspNetUsers a ON e.IdUser = a.Id

             WHERE a.Email = @username)



END



--Executing in database--

DECLARE @idemp INT;

EXEC SP_GetIdEmployeeByUserName 'someinsertedemail@gmail.com', @idemp output

SELECT @idemp;
idemp `Id = 40`
[HttpGet]

[Route("getbyname")]

public int GetByName([FromQuery] string username)

{

    try

    {

      if (!string.IsNullOrEmpty(username))

      {

        SqlParameter paramUsername = new SqlParameter("@username", username);



        var paramOut = new SqlParameter

        {

          ParameterName ="@idemp",

          SqlDbType = System.Data.SqlDbType.Int,

          Direction = System.Data.ParameterDirection.Output,

        };



        var result = _context

          .Employee.FromSqlRaw

          ($"EXEC SP_GetIdFuncByUserName @username, @idemp OUTPUT", paramUsername, paramOut)

          .FirstOrDefault();



        Console.WriteLine("result = >>>>>>>>>" + result);



        return result.Id;

      }

      else

      {

        return 0;

      }



    }

    catch (Exception ex)

    {

      Console.WriteLine("ex ->" + ex);

      throw;

    }

  }

var result = _context

        .Database.ExecuteSqlRaw

        ($"EXEC SP_GetIdFuncByUserName @username, @idemp OUTPUT", paramUsername, paramOut);
_context.Database.ExecuteSqlCommand if obsolete
SELECT [Generated Column Names] FROM 

(

  @YOURQUERY

)

var result = _context

      .Database.ExecuteSqlRaw

      ($"EXEC SP_GetIdFuncByUserName @username, @count OUTPUT", paramUsername, paramOut);

var result = _context

        .Database.ExecuteSqlRaw

        ($"EXEC SP_GetIdFuncByUserName @username, @idemp OUTPUT", paramUsername, paramOut);

var employeeId = paramOut.Value;

var employee = _context.Employee.FirstOrDefault(e => e.Id == employeeId);

我得到了这个例外：

FromSqlRaw or FromSqlInterpolated was called with non-composable SQL and with a query composing over it.

Consider calling AsEnumerable after the FromSqlRaw or FromSqlInterpolated method to perform the composition on the client side.

如果尝试

--Two tables, Employee and AspNetUsers--

CREATE PROCEDURE SP_GetIdEmployeeByUserName

  (@username varchar(100), @idemployee int output)

AS

BEGIN

  SELECT @idemployee = (SELECT e.Id 

             FROM Employee e

             JOIN AspNetUsers a ON e.IdUser = a.Id

             WHERE a.Email = @username)



END



--Executing in database--

DECLARE @idemp INT;

EXEC SP_GetIdEmployeeByUserName 'someinsertedemail@gmail.com', @idemp output

SELECT @idemp;
idemp `Id = 40`
[HttpGet]

[Route("getbyname")]

public int GetByName([FromQuery] string username)

{

    try

    {

      if (!string.IsNullOrEmpty(username))

      {

        SqlParameter paramUsername = new SqlParameter("@username", username);



        var paramOut = new SqlParameter

        {

          ParameterName ="@idemp",

          SqlDbType = System.Data.SqlDbType.Int,

          Direction = System.Data.ParameterDirection.Output,

        };



        var result = _context

          .Employee.FromSqlRaw

          ($"EXEC SP_GetIdFuncByUserName @username, @idemp OUTPUT", paramUsername, paramOut)

          .FirstOrDefault();



        Console.WriteLine("result = >>>>>>>>>" + result);



        return result.Id;

      }

      else

      {

        return 0;

      }



    }

    catch (Exception ex)

    {

      Console.WriteLine("ex ->" + ex);

      throw;

    }

  }

var result = _context

        .Database.ExecuteSqlRaw

        ($"EXEC SP_GetIdFuncByUserName @username, @idemp OUTPUT", paramUsername, paramOut);
_context.Database.ExecuteSqlCommand if obsolete
SELECT [Generated Column Names] FROM 

(

  @YOURQUERY

)

var result = _context

      .Database.ExecuteSqlRaw

      ($"EXEC SP_GetIdFuncByUserName @username, @count OUTPUT", paramUsername, paramOut);

var result = _context

        .Database.ExecuteSqlRaw

        ($"EXEC SP_GetIdFuncByUserName @username, @idemp OUTPUT", paramUsername, paramOut);

var employeeId = paramOut.Value;

var employee = _context.Employee.FirstOrDefault(e => e.Id == employeeId);

它总是返回-1，因为没有行受到影响。

我看到了很多东西，但没有成功...在此先感谢

--Two tables, Employee and AspNetUsers--

CREATE PROCEDURE SP_GetIdEmployeeByUserName

  (@username varchar(100), @idemployee int output)

AS

BEGIN

  SELECT @idemployee = (SELECT e.Id 

             FROM Employee e

             JOIN AspNetUsers a ON e.IdUser = a.Id

             WHERE a.Email = @username)



END



--Executing in database--

DECLARE @idemp INT;

EXEC SP_GetIdEmployeeByUserName 'someinsertedemail@gmail.com', @idemp output

SELECT @idemp;
idemp `Id = 40`
[HttpGet]

[Route("getbyname")]

public int GetByName([FromQuery] string username)

{

    try

    {

      if (!string.IsNullOrEmpty(username))

      {

        SqlParameter paramUsername = new SqlParameter("@username", username);



        var paramOut = new SqlParameter

        {

          ParameterName ="@idemp",

          SqlDbType = System.Data.SqlDbType.Int,

          Direction = System.Data.ParameterDirection.Output,

        };



        var result = _context

          .Employee.FromSqlRaw

          ($"EXEC SP_GetIdFuncByUserName @username, @idemp OUTPUT", paramUsername, paramOut)

          .FirstOrDefault();



        Console.WriteLine("result = >>>>>>>>>" + result);



        return result.Id;

      }

      else

      {

        return 0;

      }



    }

    catch (Exception ex)

    {

      Console.WriteLine("ex ->" + ex);

      throw;

    }

  }

var result = _context

        .Database.ExecuteSqlRaw

        ($"EXEC SP_GetIdFuncByUserName @username, @idemp OUTPUT", paramUsername, paramOut);
_context.Database.ExecuteSqlCommand if obsolete
SELECT [Generated Column Names] FROM 

(

  @YOURQUERY

)

var result = _context

      .Database.ExecuteSqlRaw

      ($"EXEC SP_GetIdFuncByUserName @username, @count OUTPUT", paramUsername, paramOut);

var result = _context

        .Database.ExecuteSqlRaw

        ($"EXEC SP_GetIdFuncByUserName @username, @idemp OUTPUT", paramUsername, paramOut);

var employeeId = paramOut.Value;

var employee = _context.Employee.FirstOrDefault(e => e.Id == employeeId);
  • https://docs.microsoft.com/en-us/ef/core/what-is-new/ef-core-3.0/break-changes#linq-queries-are-no-longer-evaluated-on-the-客户
  • https://github.com/dotnet/efcore/issues/17558
  • 在 EF Core 3.1 中包含 FromSqlRaw 和存储过程
  • 如何通过 FromSqlRaw 在 EF Core 3.0 中调用存储过程
  • EF core 3.1 无法运行复杂的原始 sql 查询
  • https://www.sqlservertutorial.net/sql-server-stored-procedures/stored-procedure-output-parameters/

您有不可组合的 SQL。关键是实体框架会写类似

--Two tables, Employee and AspNetUsers--

CREATE PROCEDURE SP_GetIdEmployeeByUserName

  (@username varchar(100), @idemployee int output)

AS

BEGIN

  SELECT @idemployee = (SELECT e.Id 

             FROM Employee e

             JOIN AspNetUsers a ON e.IdUser = a.Id

             WHERE a.Email = @username)



END



--Executing in database--

DECLARE @idemp INT;

EXEC SP_GetIdEmployeeByUserName 'someinsertedemail@gmail.com', @idemp output

SELECT @idemp;
idemp `Id = 40`
[HttpGet]

[Route("getbyname")]

public int GetByName([FromQuery] string username)

{

    try

    {

      if (!string.IsNullOrEmpty(username))

      {

        SqlParameter paramUsername = new SqlParameter("@username", username);



        var paramOut = new SqlParameter

        {

          ParameterName ="@idemp",

          SqlDbType = System.Data.SqlDbType.Int,

          Direction = System.Data.ParameterDirection.Output,

        };



        var result = _context

          .Employee.FromSqlRaw

          ($"EXEC SP_GetIdFuncByUserName @username, @idemp OUTPUT", paramUsername, paramOut)

          .FirstOrDefault();



        Console.WriteLine("result = >>>>>>>>>" + result);



        return result.Id;

      }

      else

      {

        return 0;

      }



    }

    catch (Exception ex)

    {

      Console.WriteLine("ex ->" + ex);

      throw;

    }

  }

var result = _context

        .Database.ExecuteSqlRaw

        ($"EXEC SP_GetIdFuncByUserName @username, @idemp OUTPUT", paramUsername, paramOut);
_context.Database.ExecuteSqlCommand if obsolete
SELECT [Generated Column Names] FROM 

(

  @YOURQUERY

)

var result = _context

      .Database.ExecuteSqlRaw

      ($"EXEC SP_GetIdFuncByUserName @username, @count OUTPUT", paramUsername, paramOut);

var result = _context

        .Database.ExecuteSqlRaw

        ($"EXEC SP_GetIdFuncByUserName @username, @idemp OUTPUT", paramUsername, paramOut);

var employeeId = paramOut.Value;

var employee = _context.Employee.FirstOrDefault(e => e.Id == employeeId);

它这样做是为了确定能够实现(嵌套)结果、分页等的格式。

如果你没有从你的存储过程中选择任何东西，它就不能组成这个查询。它无论如何都不会返回结果集，因此您也无法从 dbContext.Employee 中进行选择。那将是两个不同的查询。一个获取您已经拥有的 ID：

--Two tables, Employee and AspNetUsers--

CREATE PROCEDURE SP_GetIdEmployeeByUserName

  (@username varchar(100), @idemployee int output)

AS

BEGIN

  SELECT @idemployee = (SELECT e.Id 

             FROM Employee e

             JOIN AspNetUsers a ON e.IdUser = a.Id

             WHERE a.Email = @username)



END



--Executing in database--

DECLARE @idemp INT;

EXEC SP_GetIdEmployeeByUserName 'someinsertedemail@gmail.com', @idemp output

SELECT @idemp;
idemp `Id = 40`
[HttpGet]

[Route("getbyname")]

public int GetByName([FromQuery] string username)

{

    try

    {

      if (!string.IsNullOrEmpty(username))

      {

        SqlParameter paramUsername = new SqlParameter("@username", username);



        var paramOut = new SqlParameter

        {

          ParameterName ="@idemp",

          SqlDbType = System.Data.SqlDbType.Int,

          Direction = System.Data.ParameterDirection.Output,

        };



        var result = _context

          .Employee.FromSqlRaw

          ($"EXEC SP_GetIdFuncByUserName @username, @idemp OUTPUT", paramUsername, paramOut)

          .FirstOrDefault();



        Console.WriteLine("result = >>>>>>>>>" + result);



        return result.Id;

      }

      else

      {

        return 0;

      }



    }

    catch (Exception ex)

    {

      Console.WriteLine("ex ->" + ex);

      throw;

    }

  }

var result = _context

        .Database.ExecuteSqlRaw

        ($"EXEC SP_GetIdFuncByUserName @username, @idemp OUTPUT", paramUsername, paramOut);
_context.Database.ExecuteSqlCommand if obsolete
SELECT [Generated Column Names] FROM 

(

  @YOURQUERY

)

var result = _context

      .Database.ExecuteSqlRaw

      ($"EXEC SP_GetIdFuncByUserName @username, @count OUTPUT", paramUsername, paramOut);

var result = _context

        .Database.ExecuteSqlRaw

        ($"EXEC SP_GetIdFuncByUserName @username, @idemp OUTPUT", paramUsername, paramOut);

var employeeId = paramOut.Value;

var employee = _context.Employee.FirstOrDefault(e => e.Id == employeeId);

这确实返回 -1，因为您的查询中有错误。您提供了一个名为 @count 的参数，但提供了一个名为 @idemp.

的已配置参数

所以请确保你正确地传递参数：

--Two tables, Employee and AspNetUsers--

CREATE PROCEDURE SP_GetIdEmployeeByUserName

  (@username varchar(100), @idemployee int output)

AS

BEGIN

  SELECT @idemployee = (SELECT e.Id 

             FROM Employee e

             JOIN AspNetUsers a ON e.IdUser = a.Id

             WHERE a.Email = @username)



END



--Executing in database--

DECLARE @idemp INT;

EXEC SP_GetIdEmployeeByUserName 'someinsertedemail@gmail.com', @idemp output

SELECT @idemp;
idemp `Id = 40`
[HttpGet]

[Route("getbyname")]

public int GetByName([FromQuery] string username)

{

    try

    {

      if (!string.IsNullOrEmpty(username))

      {

        SqlParameter paramUsername = new SqlParameter("@username", username);



        var paramOut = new SqlParameter

        {

          ParameterName ="@idemp",

          SqlDbType = System.Data.SqlDbType.Int,

          Direction = System.Data.ParameterDirection.Output,

        };



        var result = _context

          .Employee.FromSqlRaw

          ($"EXEC SP_GetIdFuncByUserName @username, @idemp OUTPUT", paramUsername, paramOut)

          .FirstOrDefault();



        Console.WriteLine("result = >>>>>>>>>" + result);



        return result.Id;

      }

      else

      {

        return 0;

      }



    }

    catch (Exception ex)

    {

      Console.WriteLine("ex ->" + ex);

      throw;

    }

  }

var result = _context

        .Database.ExecuteSqlRaw

        ($"EXEC SP_GetIdFuncByUserName @username, @idemp OUTPUT", paramUsername, paramOut);
_context.Database.ExecuteSqlCommand if obsolete
SELECT [Generated Column Names] FROM 

(

  @YOURQUERY

)

var result = _context

      .Database.ExecuteSqlRaw

      ($"EXEC SP_GetIdFuncByUserName @username, @count OUTPUT", paramUsername, paramOut);

var result = _context

        .Database.ExecuteSqlRaw

        ($"EXEC SP_GetIdFuncByUserName @username, @idemp OUTPUT", paramUsername, paramOut);

var employeeId = paramOut.Value;

var employee = _context.Employee.FirstOrDefault(e => e.Id == employeeId);

然后使用ID参数查询：

--Two tables, Employee and AspNetUsers--

CREATE PROCEDURE SP_GetIdEmployeeByUserName

  (@username varchar(100), @idemployee int output)

AS

BEGIN

  SELECT @idemployee = (SELECT e.Id 

             FROM Employee e

             JOIN AspNetUsers a ON e.IdUser = a.Id

             WHERE a.Email = @username)



END



--Executing in database--

DECLARE @idemp INT;

EXEC SP_GetIdEmployeeByUserName 'someinsertedemail@gmail.com', @idemp output

SELECT @idemp;
idemp `Id = 40`
[HttpGet]

[Route("getbyname")]

public int GetByName([FromQuery] string username)

{

    try

    {

      if (!string.IsNullOrEmpty(username))

      {

        SqlParameter paramUsername = new SqlParameter("@username", username);



        var paramOut = new SqlParameter

        {

          ParameterName ="@idemp",

          SqlDbType = System.Data.SqlDbType.Int,

          Direction = System.Data.ParameterDirection.Output,

        };



        var result = _context

          .Employee.FromSqlRaw

          ($"EXEC SP_GetIdFuncByUserName @username, @idemp OUTPUT", paramUsername, paramOut)

          .FirstOrDefault();



        Console.WriteLine("result = >>>>>>>>>" + result);



        return result.Id;

      }

      else

      {

        return 0;

      }



    }

    catch (Exception ex)

    {

      Console.WriteLine("ex ->" + ex);

      throw;

    }

  }

var result = _context

        .Database.ExecuteSqlRaw

        ($"EXEC SP_GetIdFuncByUserName @username, @idemp OUTPUT", paramUsername, paramOut);
_context.Database.ExecuteSqlCommand if obsolete
SELECT [Generated Column Names] FROM 

(

  @YOURQUERY

)

var result = _context

      .Database.ExecuteSqlRaw

      ($"EXEC SP_GetIdFuncByUserName @username, @count OUTPUT", paramUsername, paramOut);

var result = _context

        .Database.ExecuteSqlRaw

        ($"EXEC SP_GetIdFuncByUserName @username, @idemp OUTPUT", paramUsername, paramOut);

var employeeId = paramOut.Value;

var employee = _context.Employee.FirstOrDefault(e => e.Id == employeeId);
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