c# - Call a oracle function that returns a cursor -


i have oracle function takes input parameter , returns cursor. using c# invoke oracle function, however, not able retrieve cursor.

my oracle function call follows:-

select tbl_power_view.get_power_id('v') dual;

my c# code is:

conn = new oracleconnection(oracleserver); conn.open(); oraclecommand cmd = new oraclecommand(); cmd.commandtext = "tbl_power_view.get_power_id"; cmd.commandtype = commandtype.storedprocedure; cmd.connection = conn;   oracleparameter powerid = new oracleparameter("i_power_flg", oracledbtype.varchar2); powerid.direction = parameterdirection.input; powerid.value = 'l'; cmd.parameters.add(powerid);  oracleparameter orap = new oracleparameter(); orap.parametername = "test_cursor"; orap.oracledbtype = oracledbtype.refcursor; orap.direction = system.data.parameterdirection.output; cmd.parameters.add(orap);  oracledataadapter adapter = new oracledataadapter(); adapter.selectcommand=cmd; dataset ds = new dataset(); adapter.fill(ds);

error stack follows:-

a first chance exception of type 'oracle.dataaccess.client.oracleexception' occurred in oracle.dataaccess.dll
oracle.dataaccess.client.oracleexception ora-06550: line 1, column 7:
pls-00306: wrong number or types of arguments in call 'test_cursor'
ora-06550: line 1, column 7:
pl/sql: statement ignored

do following

// use return instead of output in function  orap.direction = parameterdirection.return;

!!! return parameter must listed first unless do

cmd.bindbyname = true;

this should take care of it


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