c# - ORA-06550: 调用 Oracle 存储过程时参数的数量或类型错误

Question

procedure select_card_transaction(trans_id   nvarchar2,
                                    usr_id    number,
                                    Quantity out number) is
  begin
    select count(*)
      into Quantity
      from user_cards u
     where u.transaction_id = trans_id
       and u.user_id = usr_id;
  end;

并使用它:

using(var conn = new OracleConnection(Settings.Default.OraWUConnString))
            { 
                var cmd = conn.CreateCommand();
                cmd.CommandText = "for_temporary_testing.select_card_transaction";
                cmd.CommandType = CommandType.StoredProcedure;



                cmd.Parameters.AddWithValue("trans_id", TransactionID);
                cmd.Parameters.AddWithValue("usr_id", UserID);

                var q = new OracleParameter("Quantity", OracleType.Number);
                q.Direction = ParameterDirection.Output;
                cmd.Parameters.Add(q);
                //cmd.Parameters[0].OracleType = OracleType.NVarChar;
                //cmd.Parameters[1].OracleType = OracleType.Number; 

                conn.Open();
                var obj = cmd.ExecuteNonQuery();

                conn.Close();
                return (int)q.Value == 1;
            }

它返回以下错误。ORA-06550 调用 Oracle 存储过程时参数的数量或类型错误...有什么想法吗？

Answer 1

我以前遇到过同样的问题。您使用的是 ODP.Net 驱动程序吗？我能够通过首先添加输出参数来解决问题。这需要在输入参数之前完成。在你的情况下它看起来像

 using(var conn = new OracleConnection(Settings.Default.OraWUConnString))
            { 
                conn.Open();

                var cmd = conn.CreateCommand();
                cmd.CommandText = "for_temporary_testing.select_card_transaction";
                cmd.CommandType = CommandType.StoredProcedure;

                // Return value parameter has to be added first !
                var Quantity = new OracleParameter();
                Quantity.Direction = ParameterDirection.ReturnValue;
                Quantity.OracleDbType = OracleDbType.Int32;
                cmd.Parameters.Add(Quantity);

                //now add input parameters
                var TransID = cmd.Parameters.Add("trans_id", TransactionID);
                TransID.Direction = ParameterDirection.Input;
                TransID.OracleDbType = OracleDbType.NVarchar2;

                var UsrID = cmd.Parameters.Add("usr_id", UserID);
                UsrID.Direction = ParameterDirection.Input;
                UsrID.OracleDbType = OracleDbType.Int32;

                cmd.ExecuteNonQuery();

                conn.Close();
                return Convert.ToInt32(Quantity.Value);
            }