.net c# mvc 连接oracle

先在引用右击管理nuget程序包，然后搜索oracle，安装两个：

转：

using Oracle.ManagedDataAccess.Client;
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;

namespace board
{
    public class DbHelper
    {
        static string connString = ConfigurationManager.ConnectionStrings["oracleConnection_backups"].ToString();

        public static DataSet SelectData(string sql)
        {
            DataSet ds = new DataSet();

            try
            {
                using (OracleConnection conn = new OracleConnection(connString))
                {
                    //conn.Open();
                    OracleCommand cmd = new OracleCommand(sql, conn);
                    OracleDataAdapter adapter = new OracleDataAdapter(cmd);
                    adapter.Fill(ds);
                    return ds;
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex);
            }
            return null;
        }
    }
}