java调用ORACLE的函数

CallableStatement cstmt = con
.prepareCall("{?=call detector_plsql_fn(?,?)}");
cstmt.registerOutParameter(1, Types.VARCHAR);
cstmt.setString(2, "I");
cstmt.registerOutParameter(3, Types.VARCHAR);
cstmt.execute();
String strValue = cstmt.getString(1);
String v_out = cstmt.getString(3);
System.out.println("The return value is:" + strValue  + " and v_out is:" + v_out);
cstmt.close();

detector_plsql_fn