App_Code/DB/DBOper/DBOperBase.cs

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using System;
using System.IO;
using System.Data;
using System.Text;

using System.Data.Common;


sealed class DBOperBase
{
    public DBOperBase()
    {
        //
        // TODO: 在此处添加构造函数逻辑
        //
    }
    /// <summary>
    /// 配置文件的最后改动时间。
    /// </summary>
    private static DateTime fileUpDate;

    /// <summary>
    /// 数据库连接字符串。
    /// </summary>
    /// <author>天志</author>
    /// <log date="2007-09-01">创建</log>
    private static string connectionString;

    private DBCreator creator = null;

    public DBCreator Creator
    {
        set
        {
            creator = value;
        }
    }

    private string ConnectString
    {
        get
        {            
            if (fileUpDate != File.GetLastWriteTime(ReadXML.XmlFileName) ||
                connectionString == null)
            {
                string serverName = RegisterAccess.ReadKey("serverName");
                string userID = RegisterAccess.ReadKey("userID");
                string dataBase = RegisterAccess.ReadKey("dataBase");
                string passWord = RegisterAccess.ReadKey("passWord");
                string port = RegisterAccess.ReadKey("port");

                if (creator == null)
                {
                    throw new Exception("未设置创建ADO创建对象");
                }

                connectionString = creator.CreateConnStr(serverName, port, dataBase, userID, passWord);
                fileUpDate = File.GetLastWriteTime(ReadXML.XmlFileName);
            }