Oracle 存储过程无法从 ASP.NET 调用

Question

我在 ASP.NET 中编写了一段代码来从 Oracle 存储过程中获取数据。但是在尝试获取数据时出现错误：

ORA-06550: line 1, column 7: PLS-00306: wrong number or types of arguments in call to 'USER_FEEDBACK' ORA-06550: line 1, column 7: PL/SQL: Statement ignored

程序代码是这样的：

create or replace PROCEDURE user_feedback(cv_results out sys_refcursor,start_date IN VARCHAR2)
IS
BEGIN
 open cv_results for
select pi.first_name || ' ' || pi.last_name initiator
 ......
from request_workflow w inner join request_workflow_attribute waRating
on waRating.request_workflow_id = w.row_id
and waRating.attr_name = 'UserRating'
.............
where w.date_stamp_utc between start_date and '31-dec-2015'
order by waRating.attr_value desc, eform_name;
END ;

这是我的 ASP.NET 代码：

Oracle.DataAccess.Client.OracleCommand objCmd = new Oracle.DataAccess.Client.OracleCommand();
objCmd.Connection = objConn;
objCmd.CommandText = "user_feedback";
objCmd.CommandType = CommandType.StoredProcedure;

Oracle.DataAccess.Client.OracleParameter oraP = new Oracle.DataAccess.Client.OracleParameter();

//   System.Data.OracleClient.OracleParameter op = null; 
oraP.OracleDbType = OracleDbType.RefCursor;
oraP.ParameterName = "cv_results";
oraP.Direction = System.Data.ParameterDirection.Output;

oraP.ParameterName = "start_date";
oraP.OracleDbType = OracleDbType.Varchar2;

oraP.Value = "01-Dec-2015";
oraP.Direction = System.Data.ParameterDirection.Input;
objCmd.Parameters.Add(oraP);

objConn.Open();
objCmd.ExecuteReader();
objCmd.ExecuteNonQuery();

请建议如何让它发挥作用。

Answer 1

可能是因为你没有Add第一个参数。尝试这样的事情？

...
oraP.ParameterName = "cv_results";
oraP.Direction = System.Data.ParameterDirection.Output;
objCmd.Parameters.Add(oraP);

oraP = new Oracle.DataAccess.Client.OracleParameter();
oraP.ParameterName = "start_date";
...

不过，如果您稍后要从该 refcursor 读取，最好为第一个参数声明另一个变量。

Answer 2

您只是 creating/adding 一个参数，但用不同的值将其分配两次，导致调用只有一个参数。

相反，创建并添加两个单独的参数，例如；

var oraP1 = new Oracle.DataAccess.Client.OracleParameter();

oraP1.OracleDbType = OracleDbType.RefCursor;
oraP1.ParameterName = "cv_results";
oraP1.Direction = System.Data.ParameterDirection.Output;

objCmd.Parameters.Add(oraP1);

var oraP2 = new Oracle.DataAccess.Client.OracleParameter();

oraP2.ParameterName = "start_date";
oraP2.OracleDbType = OracleDbType.Varchar2;
oraP2.Value = "01-Dec-2015";
oraP2.Direction = System.Data.ParameterDirection.Input;

objCmd.Parameters.Add(oraP2);

Oracle 存储过程无法从 ASP.NET 调用

Oracle Stored Procedure unable to call from ASP.NET

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