如何在oracle包中运行函数（C＃）

Question

I need to call to some function and procedures that in packages in Oracle. I never worked with oracle, and i know only basic staff like insert,update table, but now i need to call "vb_new_serial " function to get back from it integer here this function function vb_new_serial return integer;

This function is located in Packages VN_PKG -> vb_new_serial

Here my code that i tried after i did some reasearches:

using (var conn = new OracleConnection(strConn2))
{
    using (var cmd = conn.CreateCommand())
    {
        cmd.CommandType = CommandType.StoredProcedure;
        cmd.CommandText = "vb_new_serial";          

        conn.Open();
        using (var dr = cmd.ExecuteReader())
        {
            MessageBox.Show(dr.ToString());
        }
     }
}

Here the image

But here i did't get back nothing.

What i am doing wrong?

Answer 1

Is there any parameters need to add in oracle command ? because return value is the first parameter added to the oracle command.

Like this

cmd.Parameters.Add("Return_Value", OracleDbType.Int16,
        ParameterDirection.ReturnValue);

Answer 2

You just need to change your code in order to get the integer that the Oracle function returns:

using (var conn = new OracleConnection(strConn2))
{
    using (var cmd = conn.CreateCommand())
    {
        cmd.CommandType = CommandType.StoredProcedure;
        cmd.CommandText = "VN_PKG.vb_new_serial";        

        OracleParameter myReturn = new OracleParameter("myReturn", OracleDbType.Int32, ParameterDirection.ReturnValue); 
        cmd.Parameters.Add(myReturn);

        conn.Open();    
        cmd.ExecuteNonQuery();

        MessageBox.Show(myReturn.Value.ToString());
     }
}