c#連接oracle數據庫 DBHelper

閑着沒事自己寫了一個OracleHelper類，希望大神給點建議優化

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>
        /// 根據配置節讀取連接數據庫
        /// </summary>
        /// <param name="key">需要連接的數據庫</param>
        public DBHelper(string key)
        {
            this.connectionstring = System.Configuration.ConfigurationManager.ConnectionStrings[key].ConnectionString;
            OpenConnection();
        }
        
        /// <summary>
        /// 定義Oracle連接
        /// </summary>
        private OracleConnection conn { get; set; }

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

        /// <summary>
        /// 構建返回Command
        /// </summary>
        /// <param name="cmdText">CommandText</param>
        /// <param name="cmd">需要返回的Command</param>
        /// <param name="cmdType">執行類型</param>
        /// <param name="param">參數列表</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>
        /// 執行存儲過程
        /// </summary>
        /// <param name="storedName">存儲過程名稱</param>
        /// <param name="param">參數列表</param>
        /// <returns>返回執行成功條數</returns>
        public int ExecuteStored(string storedName, params OracleParameter[] param)
        {
            BuilderCommand(storedName, out cmd, CommandType.StoredProcedure, param);
            return cmd.ExecuteNonQuery();
        }

        /// <summary>
        /// 獲取DataSet
        /// </summary>
        /// <param name="cmdText">執行語句</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>
        /// 獲取Table
        /// </summary>
        /// <param name="cmdText">執行語句</param>
        /// <returns>DataTable</returns>
        public DataTable GetTable(string cmdText)
        {
            return GetDateSet(cmdText).Tables[0];
        }

        /// <summary>
        /// 執行sql
        /// </summary>
        /// <param name="cmdText">執行語句</param>
        /// <param name="param">執行所需參數</param>
        /// <returns>成功執行數</returns>
        public int ExecuteSql(string cmdText, params OracleParameter[] param)
        {
            OracleCommand cmd = new OracleCommand();
            BuilderCommand(cmdText, out cmd, CommandType.Text, param);
            return cmd.ExecuteNonQuery();
        }

        /// <summary>
        /// 構建DataReader
        /// </summary>
        /// <param name="cmdText">執行語句</param>
        /// <param name="param">執行所需參數</param>
        /// <returns>DataReader</returns>
        public OracleDataReader BuilderDataReader(string cmdText, params OracleParameter[] param)
        {
            BuilderCommand(cmdText, out cmd, CommandType.Text, param);
            return cmd.ExecuteReader();
        }
    }
}