如何从C＃运行Oracle函数（vs 2012）

Question

I am trying to run function that i have in Oracle,i never worked with Oracle only with sql2008 sow i am new at this.

Here the function in Oracle that i need to call and get back integer:

create or replace function vb_new_serial return integer is
  Result integer;
begin
  select  vbserial.nextval into result from dual;
  return(Result);
end vb_new_serial;

This function dont get nothink it just retuns me integer.

I tried this ,but i getting error PLS-00221: 'VB_NEW_SERIAL' is not a procedure or is undefined :

  using (System.Data.OracleClient.OracleConnection con = new System.Data.OracleClient.OracleConnection(strConn2))
    {
        con.Open();
        System.Data.OracleClient.OracleCommand cmd = new System.Data.OracleClient.OracleCommand("vb_new_serial");
        cmd.CommandType = System.Data.CommandType.StoredProcedure;
        //System.Data.OracleClient.OracleParameter returnVal = new System.Data.OracleClient.OracleParameter("value", null);
       // cmd.Parameters.Add(returnVal);
        cmd.Connection = con;
        System.Data.OracleClient.OracleDataReader odr = cmd.ExecuteReader();//here i have error
        while (odr.Read())
        {
            Console.WriteLine(odr.GetOracleValue(0));
        }
        Console.ReadLine();
    }

What i am doing wrong?

Answer 1

您定义的第一个参数应该是返回值：

cmd.Parameters.Add("Return_Value", OracleDbType.Int32, ParameterDirection.ReturnValue);