一个读取数据库字典的C#类

在做项目时，经常会有些字典信息保存到数据库中，在应用程序启动时需要加载到内存中，方便程序随时调用。

直接上代码：

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.OleDb;

namespace TagReceiver
{
    class AccessHelper
    {
        string accessPath = "";

        /// <summary>
        /// 读取LOC_OWNER表
        /// </summary>
        /// <returns></returns>
        public SortedList GetCodeSet(string connectionString, string tableName)
        {
            string cmdText = String.Format("select * from {0}", tableName);
            SortedList sl = new SortedList();
            // 创建数据库连接 
            OleDbConnection conn = new OleDbConnection(connectionString);

            // 创建command对象并保存sql查询语句 
            OleDbCommand cmd = new OleDbCommand(cmdText, conn);
            try
            {
                conn.Open();

                // 创建datareader 对象来连接到表单 
                OleDbDataReader reader = cmd.ExecuteReader();

                // 循环遍历数据库 
                while (reader.Read())
                {
                    sl.Add(reader.GetString(0), reader.GetString(1));
                }

                // 关闭reader对象 
                reader.Close();

                // 关闭连接,这很重要 
                conn.Close();
            }

            // 一些通常的异常处理 
            catch (OleDbException e)
            {
                LogHelper lh = new LogHelper();
                lh.WriteLine(".\\Logs\\DBException.log", e.Errors[0].Message);
            }

            return sl;
        }
    }
}

如何调用：

        SortedList slLocOwner = new SortedList();
        SortedList slLocType = new SortedList();
        SortedList slFreightCarFactory = new SortedList();
        SortedList slPassengerCarFactory = new SortedList();

        private void MainForm_Load(object sender, EventArgs e)
        {
            ...
            LoadDict();
            ...
        }


        /// <summary>
        /// 加载数据库字典
        /// </summary>
        private void LoadDict()
        {
            string connectionString = String.Format("provider=microsoft.jet.oledb.4.0;data source={0}\\Dict.mdb", Application.StartupPath);
            AccessHelper ah = new AccessHelper();
            slLocOwner = ah.GetCodeSet(connectionString, "LOC_OWNER");
            slLocType = ah.GetCodeSet(connectionString, "LOC_TYPE");
            slFreightCarFactory = ah.GetCodeSet(connectionString, "CAR_FACTORY");
            slPassengerCarFactory = ah.GetCodeSet(connectionString, "PASSENGERCAR_FACTORY");
        }