如何从存储过程中获取输出结果在C＃中使用Entity Framework？

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.

我正在开发一个ASP.NET MVC项目;我的目标是从表中准备一份报告，这是我第一次写Linq代码但速度太慢了。

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.

之后我编写了一个SQL查询，它的速度非常快，我想使用存储过程从我的表中获取报表数据。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。

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#.

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

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

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

第二个问题：如何在C＃中返回输出结果？

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#:

C＃：

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

2 个解决方案

#1

Declare your store procedure using this syntax:

使用以下语法声明您的商店过程：

    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

Call this store procedure in EF:

在EF中调用此存储过程：

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

Call store procedure with parameter in EF:

使用EF中的参数调用存储过程：

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

your Object to Cast:

你的对象：

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

#2

You can declare your stored procedures using

您可以使用声明存储过程

CREATE PROCEDURE [dbo].YourStoredProcedure
    @Start DATETIME, 
    @END   DATETIME
AS

Then you can get rid of the code needed to cast from string

然后你可以摆脱从字符串转换所需的代码

In order to get the results mapped as a c# object, you need to use SqlQuery or FromSql depending on the version of Entity Framework that you are using

为了将结果映射为c＃对象，您需要使用SqlQuery或FromSql，具体取决于您使用的Entity Framework的版本

Entity Framework 6

实体框架6

var result = dbContext.Bar.SqlQuery("EXEC YourStoredProcedure").ToList();

To pass a parameter, you woild do something like

要传递参数，你可以做类似的事情

var result = dbContext.Bar.SqlQuery("EXEC YourStoredProcedure @SomeParameter", 
             new SqlParameter("@SomeParameter", TheParameterValue)).ToList();

And for Entity Framework Core 2

对于Entity Framework Core 2

var result = dbContext.Bar
.FromSql("EXEC YourStoredProcedure")
.ToList();

Where Bar is your C# object declared as a property with type DbSet<Bar> in your dbContext class

其中Bar是您的C＃对象，在dbContext类中声明为类型为DbSet 的属性

Based on your output you should create a C# object similar to

根据您的输出，您应该创建一个类似于的C＃对象

public class Bar
{
     public datetime DateRecSlash { get; set; }
     public int CodeMarz { get; set; }
}

#1