c#连接oracle数据库 DBHelper

闲着没事自己写了一个OracleHelper类，希望大神给点建议优化

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Web;
 using System.Data;
 using System.Data.OracleClient;

 namespace Common
 {
     public class DBHelper
     {
         private string connectionstring { get; set; } = System.Configuration.ConfigurationManager.ConnectionStrings["cms_mh"].ConnectionString;

         public DBHelper()
         {
             OpenConnection();
         }

         /// <summary>
         /// 根据配置节读取连接数据库
         /// </summary>
         /// <param name="key">需要连接的数据库</param>
         public DBHelper(string key)
         {
             this.connectionstring = System.Configuration.ConfigurationManager.ConnectionStrings[key].ConnectionString;
             OpenConnection();
         }

         /// <summary>
         /// 定义Oracle连接
         /// </summary>
         private OracleConnection conn { get; set; }

         private OracleCommand cmd;
         /// <summary>
         /// 打开连接
         /// </summary>
         public void OpenConnection()
         {
             if (conn == null)
                 conn = new OracleConnection(connectionstring);
             if (conn.State == ConnectionState.Closed)
                 conn.Open();
         }

         /// <summary>
         /// 构建返回Command
         /// </summary>
         /// <param name="cmdText">CommandText</param>
         /// <param name="cmd">需要返回的Command</param>
         /// <param name="cmdType">执行类型</param>
         /// <param name="param">参数列表</param>
         public void BuilderCommand(string cmdText, out OracleCommand cmd, CommandType cmdType, params OracleParameter[] param)
         {
             cmd = new OracleCommand();
             cmd.Connection = conn;
             cmd = conn.CreateCommand();
             cmd.CommandType = cmdType;
             cmd.CommandText = cmdText;
             foreach (var item in param)
             {
                 cmd.Parameters.Add(item);
             }
         }

         /// <summary>
         /// 执行存储过程
         /// </summary>
         /// <param name="storedName">存储过程名称</param>
         /// <param name="param">参数列表</param>
         /// <returns>返回执行成功条数</returns>
         public int ExecuteStored(string storedName, params OracleParameter[] param)
         {
             BuilderCommand(storedName, out cmd, CommandType.StoredProcedure, param);
             return cmd.ExecuteNonQuery();
         }

         /// <summary>
         /// 获取DataSet
         /// </summary>
         /// <param name="cmdText">执行语句</param>
         /// <returns>DataSet</returns>
         public DataSet GetDateSet(string cmdText, params OracleParameter[] param)
         {
             using (OracleDataAdapter _da = new OracleDataAdapter(cmdText, conn))
             {
                 DataSet ds = new DataSet();
                 _da.Fill(ds);
                 return ds;
             }
         }

         /// <summary>
         /// 获取Table
         /// </summary>
         /// <param name="cmdText">执行语句</param>
         /// <returns>DataTable</returns>
         public DataTable GetTable(string cmdText)
         {
             return GetDateSet(cmdText).Tables[];
         }

         /// <summary>
         /// 执行sql
         /// </summary>
         /// <param name="cmdText">执行语句</param>
         /// <param name="param">执行所需参数</param>
         /// <returns>成功执行数</returns>
         public int ExecuteSql(string cmdText, params OracleParameter[] param)
         {
             OracleCommand cmd = new OracleCommand();
             BuilderCommand(cmdText, out cmd, CommandType.Text, param);
             return cmd.ExecuteNonQuery();
         }

         /// <summary>
         /// 构建DataReader
         /// </summary>
         /// <param name="cmdText">执行语句</param>
         /// <param name="param">执行所需参数</param>
         /// <returns>DataReader</returns>
         public OracleDataReader BuilderDataReader(string cmdText, params OracleParameter[] param)
         {
             BuilderCommand(cmdText, out cmd, CommandType.Text, param);
             return cmd.ExecuteReader();
         }
     }
 }