存储过程的参数问题与C#中的调用

1. 带参数的存储过程

set ANSI_NULLS ON

set QUOTED_IDENTIFIER ON

GO

ALTER PROCEDURE [dbo].[sp_select_gua] 

@num int

AS

BEGIN

    -- SET NOCOUNT ON added to prevent extra result sets from

    -- interfering with SELECT statements.

    SET NOCOUNT ON;

   select mean from tb_gua where id=@num

   

END

C#中的调用

                conn.Open();

                SqlCommand cmd = new SqlCommand();

                cmd.CommandType = CommandType.StoredProcedure;

                cmd.CommandText = "sp_select_gua";

                cmd.Connection = conn;

                cmd.Parameters.Add(new SqlParameter("@num", SqlDbType.Int));

                cmd.Parameters["@num"].Value = Calculator();

                c = (string)cmd.ExecuteScalar();

2. 带rerurn的存储过程

 

set ANSI_NULLS ON

set QUOTED_IDENTIFIER ON

GO

ALTER PROCEDURE [dbo].[sp_select_gua2] 

(@num1 int,

@num2 int)

AS

BEGIN

    -- SET NOCOUNT ON added to prevent extra result sets from

    -- interfering with SELECT statements.

    SET NOCOUNT ON;

   return @num1+@num2;

   

END

C#中的调用

                conn.Open();

                SqlCommand cmd = new SqlCommand();

                cmd.CommandType = CommandType.StoredProcedure;

                cmd.CommandText = "sp_select_gua2";

                cmd.Connection = conn;

                cmd.Parameters.Add(new SqlParameter("@num1", SqlDbType.Int));

                cmd.Parameters["@num1"].Value = Calculator();

                cmd.Parameters.Add(new SqlParameter("@num2", SqlDbType.Int));

                cmd.Parameters["@num2"].Value = Calculator();

                cmd.Parameters.Add(new SqlParameter("@return", SqlDbType.Int));

                cmd.Parameters["@return"].Direction = ParameterDirection.ReturnValue;

                cmd.ExecuteNonQuery();

                c = cmd.Parameters["@return"].Value.ToString();

３．　带output参数的调用

set ANSI_NULLS ON

set QUOTED_IDENTIFIER ON

GO

ALTER PROCEDURE [dbo].[sp_select_gua1] 

(@num int,

@guamean nvarchar(1000)='' output,

@guaname nvarchar(10)='' output)

AS

BEGIN

    -- SET NOCOUNT ON added to prevent extra result sets from

    -- interfering with SELECT statements.

    SET NOCOUNT ON;

   select @guaname=name,@guamean=mean from tb_gua where id=@num

   

END

C#中的调用

                conn.Open();

                SqlCommand cmd = new SqlCommand();

                cmd.CommandType = CommandType.StoredProcedure;

                cmd.CommandText = "sp_select_gua1";

                cmd.Connection = conn;

                cmd.Parameters.Add(new SqlParameter("@num", SqlDbType.Int));

                cmd.Parameters["@num"].Value = Calculator();

                cmd.Parameters.Add(new SqlParameter("@guamean", SqlDbType.NVarChar, 1000));

                cmd.Parameters["@guamean"].Direction = ParameterDirection.Output;

                cmd.Parameters.Add(new SqlParameter("@guaname", SqlDbType.NVarChar, 10));

                cmd.Parameters["@guaname"].Direction = ParameterDirection.Output;

                cmd.ExecuteNonQuery();

                c = cmd.Parameters["@guamean"].Value.ToString();

                d = cmd.Parameters["@guaname"].Value.ToString();