How to read in c# oracle XmlType from store procedure

Question

I'm trying to create a XML in stored procedure in this way:

PROCEDURE DeviceSearched(
   xml_out OUT XMLTYPE
)
IS
BEGIN

    SELECT 
      XMLELEMENT("Values", 
          XMLFOREST(de_brand)
    ) 
    INTO xml_out
    FROM 
      tbldevice de 
    ;  

END DeviceSearched;

And I trying to read xml_out in c# in this way:

...
OracleCommand command = new OracleCommand(name, conn);
command.CommandType = CommandType.StoredProcedure;
command.BindByName = true;
...
command.Parameters.Add(new OracleParameter("xml_out", OracleDbType.XmlType, ParameterDirection.Output));

With this approach the issues are two:

1. Oracle exception: "ORA-01422: exact fetch returns more than requested number of rows"
2. If I modify the query to obtain one row, the procedure is ok (I think), but in c# I don't have any result.

What am I doing wrong?

Thanks in advance

Answer 1

• Running
  SELECT XMLELEMENT("Values",XMLFOREST(de_brand)) FROM tbldevice de In plsql will NOT result a single value, So trying to fetch the result in to single variable ( INTO xml_out ) will result run time error ORA-01422

• Using a store procedure to select data in Oracle is not apperciated, its a SQL Server approch, why not using a simple select

• Examples here and here will show how ODP.Net works with XML
  You may need to mix using ref corsur and XMLType to solve the matter