using System;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
namespace class_new
{
/// <summary>
/// DataClass 的摘要说明。
/// </summary>
public class DataClass
{
private string strConnection="";
private SqlConnection myConnection=null;
/// <summary>
/// 默认构造函数
/// </summary>
public DataClass()
{
strConnection=ConfigurationSettings.AppSettings["connstring"];
}
/// <summary>
/// 带参数的构造函数
/// </summary>
/// <param name="newConnectionString">数据库联接字符串</param>
public DataClass(string newConnectionString)
{
strConnection=newConnectionString;
}
/// <summary>
/// 打开数据库连接.
/// </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>
///关闭数据库连接
///</summary>
public void Close()
{
///判断连接是否已经创建
&
