c# - 在后面的代码中执行时，我的存储过程总是返回零

Question

我为登录创建了一个存储过程，它计算三个表中的行以匹配电子邮件和密码，它执行得很好，除非在输出后面的代码中调用时，输出始终为零这里是存储过程:

ALTER PROCEDURE dbo.StoredProcedure1

    (

    @Email nvarchar(50),
    @pass nvarchar(50),
    @outres int = null OUTPUT,
    @outres1 int = null OUTPUT,
    @outres2 int = null OUTPUT,
    @outres3 int = null OUTPUT
    )
AS

     DECLARE @UserId INT



    set @outres1 =  (SELECT count(*) FROM [dbo].Admins 
WHERE admin_Email=@Email AND admin_Pass=@pass)
if (@outres1=1)
 begin
 set @outres=@outres1
 SELECT @UserId = adminID
      FROM [dbo].Admins WHERE admin_Email=@Email AND admin_Pass=@pass

      set @outres1= @UserId
    RETURN @outres 
    end

set @outres2= (SELECT count(*) FROM [dbo].Instructors 
WHERE inst_Email=@Email AND inst_Pass=@pass)
if (@outres2=1)
 begin
 set @outres=@outres2
 SELECT @UserId = instructorID
      FROM [dbo].Instructors 
WHERE inst_Email=@Email AND inst_Pass=@pass
  set @outres2= @UserId
 RETURN @outres 
    end
set @outres3= (SELECT count(*) FROM [dbo].Students 
WHERE stu_Email=@Email AND stu_Pass=@pass)
if (@outres3=1)
begin
set @outres= @outres3
SELECT @UserId = studentID
      FROM [dbo].Students 
WHERE stu_Email=@Email AND stu_Pass=@pass
 set @outres3= @UserId
RETURN @outres 
end 
else
begin
set @outres=@outres3
set @outres1=0
set @outres2=0
set @outres3=0
RETURN @outres
end

如果找到，它还会保存用户的用户 ID ..当我尝试在浏览器中登录时我不能..这是背后的代码:

public int Validate_Login(String _Email, String _Password)
    {

        string lbl;
        string connstr = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
        SqlConnection con = new SqlConnection(connstr);

        SqlCommand cmdselect = new SqlCommand();

        cmdselect.CommandType = CommandType.StoredProcedure;

        cmdselect.CommandText = "[dbo].[StoredProcedure1]";

        cmdselect.Parameters.Add("@Email", SqlDbType.NVarChar, 50).Value = _Email;

        cmdselect.Parameters.Add("@Password", SqlDbType.NVarChar, 50).Value = _Password;

        cmdselect.Parameters.Add("@OutRes", SqlDbType.Int, 4);

        cmdselect.Parameters.Add("@OutRes1", SqlDbType.Int, 4);

        cmdselect.Parameters.Add("@OutRes2", SqlDbType.Int, 4);

        cmdselect.Parameters.Add("@OutRes3", SqlDbType.Int, 4);

        cmdselect.Parameters["@OutRes"].Direction = ParameterDirection.Output;
        cmdselect.Parameters["@OutRes1"].Direction = ParameterDirection.Output;
        cmdselect.Parameters["@OutRes2"].Direction = ParameterDirection.Output;
        cmdselect.Parameters["@OutRes3"].Direction = ParameterDirection.Output;

        cmdselect.Connection = con;
        int Results = 0;

        try
        {
            con.Open();
            // SqlDataReader rd = cmdselect.ExecuteReader();

            cmdselect.UpdatedRowSource = UpdateRowSource.OutputParameters;
            cmdselect.ExecuteNonQuery();
            //cmdselect.ExecuteScalar();
            /* if (rd.HasRows)
              {
                  rd.Read();

                  FormsAuthentication.RedirectFromLoginPage(ETB.Text, true);
                  Response.Redirect("Welcome.aspx");
              }
              else
              {
                  lblmsg.Text = "Invalid username or password.";
              }*/
            Results = (int)cmdselect.Parameters["@OutRes"].Value;
            int res1 = (int)cmdselect.Parameters["@OutRes1"].Value;
            int res2 = (int)cmdselect.Parameters["@OutRes2"].Value;
            int res3 = (int)cmdselect.Parameters["@OutRes3"].Value;

            if (Results == 0)
            {
                Session["userID"] = null;
            }
            else
            {
                if (res1 != 0)
                {
                    Session["userID"] = res1.ToString();
                }
                else if (res2 != 0)
                {
                    Session["userID"] = res2.ToString();
                }
                else
                {
                    Session["userID"] = res3.ToString();
                }

            }




        }
        catch (SqlException ex)
        {

            lbl = ex.Message;
        }
        finally
        {
            cmdselect.Dispose();
            if (con != null)
            {

                con.Close();

            }
        }
        return Results;


    }

我已经尝试了代码中的每条注释，这个函数总是返回零..请帮忙...

Answer 1

您期望在您的存储过程中使用@pass 但传递@Password。作为旁注，请注意您的字符大小写，根据区分大小写的字符排序规则，您可能会遇到问题。

正确的代码应该是这样的；

...
cmdselect.CommandText = "[dbo].[StoredProcedure1]";
cmdselect.Parameters.Add("@Email", SqlDbType.NVarChar, 50).Value = _Email;
cmdselect.Parameters.Add("@pass", SqlDbType.NVarChar, 50).Value = _Password;
...