Database.SqlQuery调用具有多个输出参数的存储过程 [英] Database.SqlQuery calling stored procedure that has multiple output parameters

问题描述

我有一个类似于以下的存储过程，该过程需要1个输入参数（Name）并返回2个输出参数（EmployeeId和Salary）。我们的存储过程会将Name插入Employee表中，并返回EmployeeId和Salary。

I have a stored procedure like below which takes 1 input parameter ( Name ) and returns 2 output parameters( EmployeeId and Salary). Our stored procedure will insert Name into Employee table and give us back EmployeeId and Salary.

CREATE PROCEDURE dbo.insertemployee
@iName varchar(500),
@OEmployeeId int OUTPUT,  
@OSalary Money OUTPUT

我们正在使用EF Code First方法。我能够将记录插入到employee表中，但是找不到如何访问我的两个输出参数。我知道我需要像下面这样使用。谁能告诉我结果必须是什么。根据MSDN，它可以是一个以列名作为属性的类。但是我的情况是我们不返回表的列，而是使用两个输出参数，并且我需要知道如何访问这两个输出参数@OEmployeeId和@OSalary。

We are using EF Code First approach. I am able to insert records into employee table and cannot find how I can access my two output parameters. I know that I need to use like below. Can anybody tell me what must be Result. According to MSDN, it can be a class that has column names as properties. But my case is that we are not returning columns of my table but we are using two output parameters and I need know how to access those two output parameters @OEmployeeId and @OSalary.

context.Database.SqlQuery<Result>(" exec dbo.insertemployee....);

public class Result
{
   // what properties I must give here       
}

推荐答案

您尝试使用的方法仅适用于查询结果，它无法自动将输出参数的值放入新对象中。

The method you are trying to use only works for results of a query. It can't put the values of the output parameters into a new object for you automatically.

必须在运行存储过程后显式创建参数并读取它们的值。

You have to create the parameters explicitly and read their values after the stored procedure has been run.

因此，如果您有这样的存储过程：

So if you have a stored procedure like this:

CREATE PROCEDURE dbo.insertemployee
(
    @iName varchar(500),
    @OEmployeeId int OUTPUT,  
    @OSalary Money OUTPUT
)
AS
BEGIN
    SELECT @OEmployeeId = 1337;
    SELECT @OSalary = 1000;
END

...您可以执行它并获取像这样的参数结果：

... you can execute it and get the results of the parameters like this:

using (var ctx = new Context())
{
    var nameParam = new SqlParameter("iName", "TestName");

    var employeeIdParam = new SqlParameter("OEmployeeId", SqlDbType.Int) 
    { 
        Direction = System.Data.ParameterDirection.Output 
    };

    var salaryParam = new SqlParameter("OSalary", SqlDbType.Money) 
    { 
        Direction = System.Data.ParameterDirection.Output 
    };

    ctx.Database.ExecuteSqlCommand(
        "insertemployee @iName, @OEmployeeId out, @OSalary out", 
        nameParam, employeeIdParam, salaryParam);

    var employeeId = (int)employeeIdParam.Value;
    var salary = (decimal)salaryParam.Value;
}

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