如何从存储过程中获取输出结果使用 C# 中的实体框架? [英] How to get output result from stored procedure use Entity Framework in C#?

问题描述

我正在开发一个 ASP.NET MVC 项目；我的目标是从表格中准备一份报告，所以我第一次编写 Linq 代码，但速度太慢了.

I'm working on an ASP.NET MVC project; my goal is to prepare a report from a table so, the first time I've wrote Linq code but it was too slow.

在那之后，我编写了一个 SQL 查询，它非常快，我想使用存储过程从我的表中获取报告数据.事实上，我的项目非常简单:它有两个日期——开始日期和结束日期——并在表格中显示结果.

And after that I've written a SQL query it was so fast and I want to use stored procedure for getting report data from my table. In fact my project is so easy: it gets two dates - start date and end date - and displays result in a table.

我想编写我的存储过程以从 C# 代码中获取两个参数 - 开始日期和结束日期，然后在 C# 中的变量中返回输出.

I want to write my stored procedure to get two parameters - start date and end date - from C# code and then return output in a variable in C#.

第一个问题:如何将我的 SQL 查询转换为具有两个参数的存储过程，开始日期和结束日期?

The first question: how to convert my SQL query to a stored procedure with two parameters, start Date and End date?

第二个问题:如何在C#中返回输出结果?

The second question: how to return output result in C#?

SELECT 
    CAST(date_rec_slash AS DATETIME), COUNT(code_marz) AS total,
    CASE
       WHEN code_marz = 1 THEN 'a'
       WHEN code_marz = 2 THEN 'b'
       WHEN code_marz = 3 THEN 'c'
       WHEN code_marz = 4 THEN 'd'
       WHEN code_marz = 5 THEN 'e'
    END
FROM 
    dbo.tbl_bar 
WHERE 
    CAST(date_rec_slash AS DATETIME) BETWEEN '2017/12/01' AND '2017/12/31'
GROUP BY 
    CAST(date_rec_slash AS DATETIME), code_marz
ORDER BY 
    CAST(date_rec_slash AS DATETIME) ASC;

C#:

var spResults = db.Database.SqlQuery<tbl_bar>("Report");

推荐答案

使用以下语法声明您的存储过程:

Declare your store procedure using this syntax:

    USE yourDataBaseNAme
    GO

    CREATE PROCEDURE [dbo].yourStoreProcedureName
    @startDate nvarchar(30), 
    @endDate   nvarchar(30)
    AS 
       SELECT Cast(date_rec_slash as datetime) AS 'date_rec_slash', count(code_marz) as total,
              CASE
                  WHEN code_marz = 1 THEN 'a'
                  WHEN code_marz = 2 THEN 'b'
                  WHEN code_marz = 3 THEN 'c'
                  WHEN code_marz = 4 THEN 'd'
                  WHEN code_marz = 5 THEN 'e'
              END AS 'code_marz'
      FROM dbo.tbl_bar 
     WHERE Cast(date_rec_slash as datetime) between @startDate 
                                                AND @endDate
     GROUP BY Cast(date_rec_slash as datetime), code_marz
     ORDER BY Cast(date_rec_slash as datetime) ASC;
    GO

在 EF 中调用这个存储过程:

Call this store procedure in EF:

db.Database.SqlQuery<yourObjectNameToCAST>("yourStoreProcedureName");

在 EF 中使用参数调用存储过程:

Call store procedure with parameter in EF:

SqlParameter startDate= new SqlParameter("@startDate", "Value");
SqlParameter endDate= new SqlParameter("@endDate", "Value");
db.Database.SqlQuery<yourObjectNameToCAST>("exec yourStoreProcedureName @startDate, @endDate", startDate, endDate).ToList();

您要投射的对象:

public class yourObjectNameToCAST
{
     public datetime date_rec_slash { get; set; }
     public int total { get; set; }
     public string code_marz { get; set; }
}

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