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using System;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
namespace class_new
{
 /// <summary>
 /// DataClass µÄժҪ˵Ã÷¡£
 /// </summary>
 public class DataClass
 {
  private string strConnection="";
  private SqlConnection myConnection=null;
  /// <summary>
  /// ĬÈϹ¹Ô캯Êý
  /// </summary>
  public DataClass()
  {
   strConnection=ConfigurationSettings.AppSettings["connstring"];
  }
  /// <summary>
  /// ´ø²ÎÊýµÄ¹¹Ô캯Êý
  /// </summary>
  /// <param name="newConnectionString">Êý¾Ý¿âÁª½Ó×Ö·û´®</param>
  public DataClass(string newConnectionString)
  {
   strConnection=newConnectionString;
  }
  /// <summary>
  /// ´ò¿ªÊý¾Ý¿âÁ¬½Ó.
  /// </summary>
  private bool Open()
  {
   try
   {
    if(myConnection!=null)
    {
     if(myConnection.State==ConnectionState.Open)
     {
      myConnection.Close();
     }
    }
    myConnection=new SqlConnection(strConnection.Trim());
    myConnection.Open();
    return true;
   }
   catch(Exception ex)
   {  
    SystemError.SystemLog(ex.Message);
    return false;
   }
  }
  ///<summary>
  ///¹Ø±ÕÊý¾Ý¿âÁ¬½Ó
  ///</summary>
  public  void Close()
  {
   ///ÅжÏÁ¬½ÓÊÇ·ñÒѾ­´´½¨
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