一个读取数据库字典的C#类

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;
}
}
}

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");
}