Question

您好我尝试在输出值为的sql中创建sp 这是代码

ALTER PROCEDURE [dbo].[usp_SelectHospital_IfExiste_Department]
@HospitalDepartmentID INT,
@IfExiste INT OUTPUT 
AS

    SET NOCOUNT ON
SET TRANSACTION ISOLATION LEVEL READ COMMITTED
IF NOT EXISTS  (SELECT c.DeptID FROM Clinic c WHERE DeptID=@HospitalDepartmentID )
BEGIN


    SET @IfExiste=0

SELECT
    [HospitalDepartmentID],
    [NAME]
FROM
    [dbo].[Hospital_Department]
WHERE
    [HospitalDepartmentID] = @HospitalDepartmentID

END

ELSE
BEGIN
    SET @IfExiste=1

SELECT
    [HospitalDepartmentID],
    [NAME]
FROM
    [dbo].[Hospital_Department]
WHERE
    [HospitalDepartmentID] = @HospitalDepartmentID
    END

和C＃代码

public static Hospital_Department GetDepartmentInfo(int ID,int OutIfExist)
        {
            SqlCommand cmd;
            SqlDataReader dr;
            Hospital_Department HD = new Hospital_Department();
            using (cmd = new SqlCommand("usp_SelectHospital_IfExiste_Department", ProjectCon.GetCon()))
            {
                cmd.CommandType = CommandType.StoredProcedure;
                cmd.Parameters.AddWithValue("@HospitalDepartmentID", ID);
                //cmd.Parameters.Add("@IfExiste",SqlDbType.Int).Direction = ParameterDirection.Output;
                cmd.Parameters.Add("@IfExiste",SqlDbType.Int);
                cmd.Parameters["@IfExiste"].Direction = ParameterDirection.Output;
                dr = cmd.ExecuteReader();
                while (dr.Read())
                {
                    HD.NAME = dr["NAME"].ToString();
                    HD.HospitalDepartmentID = Convert.ToInt32(dr["HospitalDepartmentID"]);
                }
                OutIfExist = Convert.ToInt32(cmd.Parameters["@IfExiste"].Value);
                return HD;
            }

        }

当我尝试获取输出值时始终为null 我在sql中运行存储过程运行并返回值所以请告诉我代码中的错误 thx

Answer 1

也许这个question有用的信息：

根据http://msdn.microsoft.com/en-us/library/ms971497，您必须在处理输出参数之前关闭datareader。

希望它有所帮助。

从输出参数C＃中获取值

1 个答案: