Trying to call a function from C#

Question

Hi all,
I am having problems calling a function that returns a sys refcursor and takes a varchar2 as an input. From the SQL Developer IDE I see that the function is run like
DECLARE
X_AR_MHTR VARCHAR2(200);
v_Return sys_refcursor;
BEGIN
X_AR_MHTR := 697678;
v_Return := CMS_SMS.FOR_WEB.WEB_STATION_1(
X_AR_MHTR => X_AR_MHTR
/* Legacy output:
DBMS_OUTPUT.PUT_LINE('v_Return = ' || v_Return);
:v_Return := v_Return; --<-- Cursor
END;
here is my C# code
public static void getTilemetriseis(bool isLemessos, string AMSet, out OracleDataReader dr)
DataSet ds = new DataSet();
OracleDataAdapter ad = new OracleDataAdapter();
OracleCommand cmd = new OracleCommand();
cmd.CommandType = CommandType.StoredProcedure;
cmd.CommandText = "CMS_SMS.FOR_WEB.WEB_Station_1";
if (isLemessos)
cmd.Parameters.Add("X_AR_MHTR", OracleDbType.Varchar2, ConfigurationManager.AppSettings["LemessosArMhtr"].ToString(), ParameterDirection.Input);
cmd.Parameters.Add(new OracleParameter("anexoflCur", OracleDbType.RefCursor, ParameterDirection.ReturnValue));
// ad.SelectCommand.CommandText = string.Format(@"select m_code,ar_mhtr,city,address,stcode
// from cms_sms.FOR_WEB.flowmetersall where ar_mhtr = {0}
// order by length(ar_mhtr),ar_mhtr", ConfigurationManager.AppSettings["LemessosArMhtr"].ToString());
else
cmd.Parameters.Add("X_AR_MHTR", OracleDbType.Varchar2, "697678", ParameterDirection.Input);
cmd.Parameters.Add(new OracleParameter("v_Return", OracleDbType.RefCursor, ParameterDirection.ReturnValue));
// ad.SelectCommand.CommandText = string.Format(@"select m_code,ar_mhtr,city,address,stcode
// from cms_sms.FOR_WEB.flowmetersall where ar_mhtr= -1
// order by length(ar_mhtr),ar_mhtr", AMSet);
cmd.Connection = OracleDBManager.getOracleCMSConnection();
cmd.ExecuteNonQuery();
dr = (OracleDataReader)cmd.Parameters["v_Return"].Value;
cmd.Connection.Close();
The error rises on cmd.ExecuteNonQuery() and is described as
ORA-06550:
PLS-00306: wrong number or type of argument
Any ideas?

Answer 1

Off the top of my head, your parameter type on the second parameter is wrong. The function doesn't have a return value, one of the parameters contains it. So the second parameter's type can't be ReturnValue (should be output).
Either that or change the function to only have one parameter and add RETURN sys_refcursor into the definition, at which point you can use ReturnValue.
Here's an example: http://stackoverflow.com/questions/1773534/what-is-the-right-way-to-call-an-oracle-stored-function-from-ado-net-and-get-the
Edited by: Tridus on Mar 20, 2013 10:24 AM