using System;
using System.Windows.Forms ;
using System.Text;
using System.Xml;
using System.Xml.XPath;
using System.IO;
namespace DataServer
{
	/// <summary>
	/// DBConnectXml 的摘要說明。
	/// </summary>
	public class DBConnectXml
	{
		private XmlElement xmlRoot ;
		private XmlDocument xmlDoc ;
		private static DBConnectXml _Instance = null ;
		private string strRootName  ;
		private string FileName
		{
			get
			{
				return System.AppDomain.CurrentDomain.BaseDirectory+"DBConnect.xml" ;
			}
		}
		public DBConnectXml()
		{
			Load() ;
		}
		public static DBConnectXml Instance()
		{
			if (_Instance == null)
				_Instance = new DBConnectXml() ;

			return _Instance ;
		}
		private bool Load()
		{
			if (!File.Exists(FileName))
				CreateMaillinkFile(FileName);

			if (xmlDoc == null)
				xmlDoc = new XmlDocument() ;	
			try
			{
				xmlDoc.Load(FileName) ;
			}
			catch
			{
				return false ;
			}
			xmlRoot = xmlDoc.DocumentElement ;
			if (xmlRoot != null)
				strRootName = "/" + xmlRoot.Name + "/" ;
			return true ;
		}
		public string GetNode(string strName)
		{			
			XmlNode xNode = xmlRoot.SelectSingleNode(strRootName + strName) ;
			if (xNode == null)
				return null ;
			else
				return xNode.InnerText ;
		}
		private void CreateMaillinkFile(string strFileName)
		{
			StringBuilder sb = new StringBuilder() ;
			sb.Append("<?xml version='1.0\' ?> ") ;
			sb.Append("<dbconfig>") ;
			sb.Append("<ServerName>fipamw</ServerName>") ;
			sb.Append("<DataBase>kr_train</DataBase>") ;
			sb.Append("<LogID>sa</LogID>") ;
			sb.Append("<PWD></PWD>") ;
			sb.Append("</dbconfig>") ;
			XmlDocument xmlDoc = new XmlDocument() ;
			xmlDoc.LoadXml(sb.ToString()) ;
			xmlDoc.Save(strFileName) ;
		}
	}
}