OUTPUT Parameters in Stored Procedure

[pvl]

Hi, I have this SP:
------------
CREATE PROCEDURE `z1`(param1 INTEGER(11), OUT param2 INTEGER(11))
NOT DETERMINISTIC
SQL SECURITY DEFINER
COMMENT ''
BEGIN
set param2=param1*2;
END;
-------------
when I try run ExecuteNonQuery() method I get error msg: "OUT or INOUT argument 2 for routine z1 is not a variable".
How I can get value from OUT parameters?

Thanks.

[Serious]

To receive out parameters from stored procedures you have to use following syntax

Code: Select all

MySqlCommand command = new MySqlCommand("call z1(10, @param2);select @param2;", connection);
using (IDataReader reader = command.ExecuteReader())
{
  if (reader.Read())
    Console.WriteLine("@param2 = " + reader[0]);
}