如何从存储过程中返回和使用数值字段 [英] how do return and use From Stored Procedure Numeric Filed Value
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问题描述
大家好
我想在sql server中返回一个数字字段,并在c#
中使用它
我写了这段代码,但不正确
请帮助我
存储过程代码
hi all
i want return one numeric field in sql server and use from it in c#
i wrote this code but not correct
please help me
Stored Procedure Code
set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
go
ALTER Procedure [dbo].[Calc_Product_Price]
(@product_id int,
@Price int output)
as
if not exists (select * from Products where [product_id]=@product_id)
return -1
else
begin
select @Price=[product_sell_price] from Products where [product_id]=@product_id
print @Price
return @Price
end
C#代码:
C# Code :
public int Calc_Product_price(int Product_id)
{
SqlConnection MySqlConnection = new SqlConnection(ConnectionMain.strconnection);
SqlCommand MySqlCommand = MySqlConnection.CreateCommand();
MySqlCommand.CommandText = "Calc_Product_Price";
MySqlCommand.CommandType = CommandType.StoredProcedure;
MySqlCommand.Parameters.Add("@product_id", SqlDbType.BigInt, 8).Value = Product_id;
MySqlCommand.Parameters.Add("@Price", SqlDbType.BigInt, 8).Value = 0;
SqlParameter retval = MySqlCommand.Parameters.Add("@Price", SqlDbType.BigInt );
retval.Direction = ParameterDirection.ReturnValue;
if (MySqlConnection.State != ConnectionState.Open)
{
MySqlConnection.Open();
}
MySqlCommand.ExecuteNonQuery();
int result =(int) MySqlCommand.Parameters["@Price"].Value;
if (MySqlConnection.State != ConnectionState.Closed)
{
MySqlConnection.Close();
}
if (result == 1)
{
return result;
}
else
{
return -1;
}
}
推荐答案
我认为您的这一行应该像这样更改
I think your this line should be change like this
retval.Direction = ParameterDirection.ReturnValue;
retval.Direction=ParameterDirection.Output; // This is important!
了解更多详情
http://stackoverflow.com/Problems/3433694/如何运行存储过程-具有-c的输出参数 [ ^ ]
希望对您有所帮助.
for more details
http://stackoverflow.com/questions/3433694/how-to-run-the-stored-procedure-that-has-output-parameter-from-c[^]
I hope this will help you.
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