Question

EmployeeTrackDatacontextDataContext db = new EmployeeTrackDatacontextDataContext();
DataSet logStatusDs = new DataSet();

我有一个数据集：

public DataSet Sequence(Int32 userId)
{
    //load the List one time to be used thru out the intire application
    var ConnString = System.Configuration.ConfigurationManager.ConnectionStrings["EMSJConnectionString"].ConnectionString;
    using (SqlConnection connStr = new SqlConnection(ConnString))
    {
        using (SqlCommand cmd = new SqlCommand("get_LoginStatusQ", connStr))
        {
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.Parameters.AddWithValue("@UserId", userId);
            cmd.Connection.Open();
            new SqlDataAdapter(cmd).Fill(logStatusDs);

            //DataTable dt = logStatusDs.Tables[0].Rows[0];
        }
    }

    return logStatusDs;
}

我使用的存储过程是：

ALTER PROCEDURE [dbo].[get_LoginStatusQ]  
   @UserId int
AS   
BEGIN  
   SET NOCOUNT ON;

   SELECT TOP 1 LoginStatus 
   FROM UserTime 
   WHERE UserId = 2 
   ORDER BY UserTimeId DESC
END

返回此数据：

         LoginStatus
       ________________   
       1 |    In     |

方法

Sequence(Convert.ToInt32(Session["userid"]))

我在PageLoad

上运行它

在这个方法之后，我想从存储过程中获取返回值，即＆＃34; In＆＃34;并在IF语句中进行比较。我怎么能这样做？

前：

If(ReturnValueOfStoredProcedure != "In")
{   do stuf...}
else
{  do stuff...  }

示例将不胜感激。

Answer 1

您只是从查询中返回单个值。这可以使用ExecuteScalar而不是构建和填充DataSet及其表

来完成

public string  Sequence(Int32 userId)
{
    //load the List one time to be used thru out the intire application
    var ConnString = System.Configuration.ConfigurationManager.ConnectionStrings["EMSJConnectionString"].ConnectionString;
    using (SqlConnection connStr = new SqlConnection(ConnString))
    {
        using (SqlCommand cmd = new SqlCommand("get_LoginStatusQ", connStr))
        {
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.Parameters.AddWithValue("@UserId", userId);
            cmd.Connection.Open();
            object result = cmd.ExecuteScalar();
            return result == null ? string.Empty : result.ToString()
        }
    }
}

现在电话只是

string status = Sequence(Convert.ToInt32(Session["userid"])) 
if(status == "In")
{  

}
else
{

}

唯一要查找的是ExecuteScalar的返回值，如果查询找不到具有给定ID的用户，则该值可能为null

如何从存储过程中获取值并将其与if子句进行比较

1 个答案: