sql - 存储过程始终返回 -1(asp.net MVC、Entity、SQL)

Question

我尝试从数据库第一个 MVC Entity Framework 项目调用 SQL Server 中的存储过程，但返回值始终返回 -1。

我尝试了很多不同的方法来解决这个问题，但到目前为止都没有成功。我在下面列出了我认为是我的相关代码。让我知道是否需要更多代码。感谢任何可以提供帮助的人!

这只是我的测试代码，看看它是否正常工作。

public ActionResult Index()
{
    Cust_Entities cse = new Cust_Entities();

    if (cse.DoesCustomerNumberExist("1") == 1)
    {
        return RedirectToAction("Index", "Home");
    }
    else
    {
        return RedirectToAction("About", "Home");
    }          
}

public virtual int DoesCustomerNumberExist(string customer_Number)
{
    var customer_NumberParameter = customer_Number != null ?
        new ObjectParameter("Customer_Number", customer_Number) :
        new ObjectParameter("Customer_Number", typeof(string));

    return ((IObjectContextAdapter)this).ObjectContext.ExecuteFunction("DoesCustomerNumberExist", customer_NumberParameter);
}

SQL Server 存储过程代码:

ALTER PROCEDURE [dbo].[DoesCustomerNumberExist]
      @Customer_Number VARCHAR(20)
AS
BEGIN
      SET NOCOUNT ON;

      DECLARE @Exists INT

      IF EXISTS(SELECT Customer_Number
                        FROM business_Final.dbo.AR_Customer
                        WHERE Customer_Number = @Customer_Number)
      BEGIN
            SET @Exists = '1'
      END
      ELSE
      BEGIN
            SET @Exists = '0'
      END

      RETURN @Exists
END

Answer 1

您正在使用 ExecuteFunction 的非类型化版本。根据文档:

Executes a stored procedure or function that is defined in the data source and expressed in the conceptual model; discards any results returned from the function; and returns the number of rows affected by the execution.

如果未进行任何修改，则通常为 -1。

这是关于 ExecuteFunction 的不同形式的文档: https://msdn.microsoft.com/en-us/library/system.data.objects.objectcontext.executefunction(v=vs.110).aspx