sql2005下运用 SqlDependency 实现实时缓存 其效果比aspnet_regsql快很多

缓存调用类

public class SQLCacheUtil
{
private static SqlConnection con = new SqlConnection("server=.;database=SLWCF;uid=sa;pwd=123456");
private static DataTable dt = new DataTable();

public static void insertSqlCache()
{
dt.Clear();
SqlCommand com = new SqlCommand("SELECT [Id],[Name],[PassWord] FROM dbo.Users", con);
SqlDependency.Start("server=.;database=SLWCF;uid=sa;pwd=123456");
System.Web.Caching.SqlCacheDependency sqldep = new System.Web.Caching.SqlCacheDependency(com);
con.Open();
SqlDataReader dr = com.ExecuteReader();
dt.Load(dr);
HttpContext.Current.Response.Write(dt.Rows.Count);
HttpContext.Current.Cache.Insert("insertSQL", dt, sqldep, DateTime.Now.AddHours(1), TimeSpan.Zero, System.Web.Caching.CacheItemPriority.High, null);
dr.Close();
com.Clone();
con.Close();

}
}

测试页面

if (Cache["insertSQL"] == null)
{
SQLCacheUtil.insertSqlCache();
}
DataTable dt2 = (DataTable)Cache["insertSQL"];
this.GridView2.DataSource = dt2;
this.GridView2.DataBind();

重点强调：

1.

SqlCommand com = new SqlCommand("SELECT [Id],[Name],[PassWord] FROM dbo.Users", con);
SqlDependency.Start("server=.;database=SLWCF;uid=sa;pwd=123456");
System.Web.Caching.SqlCacheDependency sqldep = new System.Web.Caching.SqlCacheDependency(com);
顺序要 com->SqlDependency.Start->new SqlCacheDependency

2. SqlCacheDependency(com)
在声明SqlCacheDependency对象时候 有两种方式 在sql2005的情况下一定要用 SqlCommand 做为参数