Question

我在Oracle中编写了这个程序：

create or replace
PROCEDURE P1 
(
   ID_1 IN NUMBER   
  , P_NAME OUT VARCHAR2  
) AS 
BEGIN
 -- INSERT INTO A1 (ID, NAME_) VALUES (ID_1,'6666');
  SELECT NAME_ into  p_name  FROM  A1 WHERE ID=ID_1; 
END P1;

并在c＃中编写此代码以运行该程序：

cmd.Connection = conn;
            cmd.CommandText = "P1";
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.Parameters.Add("ID_1", 88);
            cmd.Parameters.Add("p_name", OracleType.VarChar, 16).Direction = ParameterDirection.ReturnValue;
            cmd.Connection.Open();
            cmd.ExecuteNonQuery();
            Console.WriteLine(cmd.Parameters["p_name"].Value.ToString());
            cmd.Connection.Close();

但是当我运行c＃app时，我收到了这个错误：

Unhandled Exception: System.Data.OracleClient.OracleException: ORA-06550: line 1
, column 18:
PLS-00306: wrong number or types of arguments in call to 'P1'
ORA-06550: line 1, column 7:
PL/SQL: Statement ignored

发生了什么事？

Answer 1

标记为ParameterDirection.Output的参数需要ParameterDirection.ReturnValue而不是OUT。

您还在使用ExecuteNonQuery查询（SELECT）

Answer 2

在黑暗中刺伤：

// this line looks wrong as it's not the return value, that's the return value of the procedure itself.
cmd.Parameters.Add("p_name", OracleType.VarChar, 16).Direction = ParameterDirection.ReturnValue;

// I think it should be ouput
cmd.Parameters.Add("p_name", OracleType.VarChar, 16).Direction = ParameterDirection.Output;

用c＃调用oracle过程时出错？

2 个答案: