FETCHING OUTPUT VALUE FROM PL/SQL BLOCK

Question

hI aLL,
I'm working on ODP.NET. I'm executing below pl/sql command. while executing this command in pl/sql it's showing the output which is an xml.
declare
xmloutput xmltype;
xmldata varchar(32767);
teid t_id := t_en_id( 'L','L',NULL,12121,'ABC','USER','N');
tgetinfo to_info := NULL;
RETVAL NUMBER;
begin
RETVAL := GET_DTLS(teid,tgetinfo);
dbms_output.put_line(RETVAL);
xmldata := tgetinfo.XML_info.getclobval();
dbms_output.put_line(xmldata);
end;
I passed above command in string variable for passing in code. like below
string StrQry = "";
StrQry += "declare \n";
StrQry += "xmloutput xmltype; \n";
StrQry += "xmldata varchar(32767); \n";
StrQry += "teid t_id := t_en_id( 'L','L',NULL,12121,'ABC','USER','N'); \n";
StrQry += "tgetinfo to_info := NULL; \n";
StrQry += "RETVAL NUMBER; \n";
StrQry += "begin \n";
StrQry += "RETVAL := GET_DTLS(teid,tgetinfo); \n";
StrQry += "dbms_output.put_line(RETVAL); \n";
StrQry += "xmldata := tgetinfo.XML_info.getclobval(); \n";
StrQry += "dbms_output.put_line(xmldata); \n";
StrQry += "end; \n";
I'm passing output parameter ":temp" for this command. I want to catch output xml in ":temp" variable
which is varchar2 type.
Added below line before printing xmldata;
StrQry += ":temp := xmldata; \n";
cn.Open();
OracleCommand cmd = new OracleCommand(StrQry, cn);
cmd.Parameters.Add(":temp", OracleDbType.Varchar2, 32767, ParameterDirection.Output);
cmd.ExecuteNonQuery();
But which executing through c# code it's showing the below error.
Oracle.DataAccess.Client.OracleException ORA-06502: PL/SQL: numeric or value err
or: character string buffer too small
ORA-06512: at line 11 at Oracle.DataAccess.Client.OracleException.HandleError
Helper(Int32 errCode, OracleConnection conn, IntPtr opsErrCtx, OpoSqlValCtx* pOp
oSqlValCtx, Object src, String procedure)
at Oracle.DataAccess.Client.OracleException.HandleError(Int32 errCode, Oracle
Connection conn, String procedure, IntPtr opsErrCtx, OpoSqlValCtx* pOpoSqlValCtx
, Object src)
at Oracle.DataAccess.Client.OracleCommand.ExecuteNonQuery()
at orclGetDetails.Program.DoProcess()
How can i get the output to output variable ":temp".
Pls help.
Ideas are appreciated.

Answer 1

Your PL/SQL block isn't returning anything. DBMS_OUTPUT is, at best, a way of debugging code, not passing data around. Assuming you configure and enable an appropriately sized buffer, I suppose your ODP.Net application could make DBMS_OUTPUT.GET_LINE calls to retrieve the XML. But that's not not a way to design an application.
If you want a PL/SQL block that returns XML, you'll need to create a function and have the function return the XML (you could also create a procedure with an OUT parameter in which you could return the XML).
Justin