asp.net 实现文件缓存依赖，数据库缓存依赖

asp.net 实现文件缓存依赖，数据库缓存依赖 

     Demo简单的是实现Asp.net2.0中缓存机制的实现：

    注：对数据库的缓存依赖，.net目前并不支持oracle数据库（方法可以参考转帖文章）》

public partial class _Default : System.Web.UI.Page 
{
    string connstr;

    protected void Page_Load(object sender, EventArgs e)
    {
        connstr = "server=.;dataBase=MIS;uid=sa;password=123";
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        //-------------------文件依赖缓存--------------------- 

        DataTable dt=getInfo();

        CacheDependency cd=new CacheDependency(Server.MapPath("file.txt"));

        Cache.Insert("Data",dt,cd);
    }

    private DataTable getInfo()
    {
        
        using (SqlConnection conn = new SqlConnection(connstr))
        {
            string sql = "select * from mis";
            
            SqlCommand cmd = new SqlCommand(sql,conn);
            conn.Open();
            SqlDataAdapter ada = new SqlDataAdapter(cmd);

            DataTable dt = new DataTable();

            ada.Fill(dt);

            return dt;
        }
  
    }

    protected void Button3_Click(object sender, EventArgs e)
    {

        //-------------显示数据----------- 

        if (Cache.Get("Data") != null)
        {
            DataTable dt = Cache.Get("Data") as DataTable;
            GridView1.DataSource = dt;
            GridView1.DataBind();
        }
        else
        {
            //缓存过期 
            Response.Write("Cache is null");
        }
        
    }
    protected void Button2_Click(object sender, EventArgs e)
    {
        //-------------MSSQL数据库依赖缓存-------------------- 

        string dbname = "MIS";    //注意，数据库必须在web.config中做相应的配置 
        string tblname = "mis";

       //启用指定数据库，数据表的缓存依赖 
        SqlCacheDependencyAdmin.EnableTableForNotifications(connstr, tblname);

        SqlCacheDependency scd = new SqlCacheDependency(dbname,tblname);

        DataTable dt = getInfo();
        Cache.Insert("Data", dt, scd);
        
    }

}

 

web.config:

<connectionStrings>
    <add name ="mis" connectionString ="server=.;dataBase=MIS;uid=sa;password=123"/>
  </connectionStrings>
<system.web>
    <caching >
      <sqlCacheDependency >
        <databases >
          <add name="MIS" connectionStringName="mis"/>
        </databases>
      </sqlCacheDependency>
    </caching>
</system.web>

本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/JustLovePro/archive/2008/11/07/3248697.aspx