calling oracle stored procedure from asp.net application - asp.net

Question

in my asp.net application, i am calling a stored procedure (oracle) to get some values from database.
Following is the sp:
create or replace PROCEDURE GetUserData(
--SQLWAYS_EVAL# ARCHAR(100)
UserName IN NVARCHAR2, v_refcur OUT SYS_REFCURSOR)
as
BEGIN
BEGIN --SQLWAYS_EVAL# =#Password;
open v_refcur for SELECT StaffId,
UserName,
Password,
Pin,
LastUpdateId,
LastUpdateDate,
FullName,
PinFailedAttempts,
PinFailedDate
FROM UserData
WHERE UserName = UserName;
END;
RETURN;
END;
Can anyone help me how to call this sp from my asp.net code.

Answer 1

Using ODP, you'll can do something like the following:
make your stored procedure a function that takes the user name in parameter and returns a refcursor
create or replace FUNCTION GetUserData(UserName IN NVARCHAR2) RETURN SYS_REFCURSOR;
and then
using (var connection = new OracleConnection(connectionString))
{
using (var command = new OracleCommand("GetUserData", connection))
{
command.CommandType = CommandType.StoredProcedure;
command.BindByName = true;
// Return value parameter has to be added first !
var returnValueParameter = new OracleParameter();
returnValueParameter.Direction = ParameterDirection.ReturnValue;
returnValueParameter.OracleDbType = ParameterDirection.RefCursor;
command.Parameters.Add(returnValueParameter);
var userNameParameter = command.Parameters.Add("UserName", userName);
returnValueParameter.Direction = ParameterDirection.In;
using (OracleDataReader reader = command.ExecuteReader())
{
while (reader.Read())
{
// Read the current record's fields
}
}
}
}

Answer 2

The Microsoft Enterprise Library simplifies the discovery and binding of Oracle Stored Procedures. It is not too difficult to build a Data Access Layer between your Business Objects and the Oracle database. I am more a fan of ORM tools these days like DevExpress's XPO, which in the latest release supports calling stored procedures. However, the Microsoft Entlib is free whereas DevExpress is not.
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Common;
using Microsoft.Practices.EnterpriseLibrary.Data;
using Your.BusinessObjects;
namespace DataAccess
{
public class UserDataDAL
{
public static Database dataBase = DatabaseFactory.CreateDatabase(); ///< Use default connection string configured in web.config
public static List<UserInfo> GetData(string userName)
{
List<UserInfo> listOfUserInfo = new List<UserInfo>();
UserInfo userInfo;
DbCommand cmd = dataBase.GetStoredProcCommand("SCHEMA.GETUSERDATA");
dataBase.DiscoverParameters(cmd);
dataBase.SetParameterValue(cmd, "USERNAME", userName);
using (IDataReader dr = dataBase.ExecuteReader(cmd))
{
while (dr.Read())
{
userInfo = new UserInfo();
userInfo.StaffId = dr["STAFFID"] != DBNull.Value ? Convert.ToInt32(dr["STAFFID"]) : 0;
userInfo.UserName = dr["USERNAME"] != DBNull.Value ? Convert.ToString(dr["USERNAME"]) : String.Empty;
userInfo.Password = dr["PASSWORD"] != DBNull.Value ? Convert.ToString(dr["PASSWORD"]) : String.Empty;
userInfo.LastUpdateId = Convert.ToInt32(dr["LASTUPDATEID"]);
userInfo.LastUpdateDate = dr["LASTUPDATEDATE"] != null ? Convert.ToDateTime(dr["LASTUPDATEDATE"]) : new DateTime();
listOfUserInfo.Add(userInfo);
}
}
return listOfUserInfo;
}
}
}
If you only ever expect one row to be returned from the procedure, then you can return the first item in the list if present etc.