Sql server 我还应该在SQL分析器中看到查询命中吗?
我目前正在构建一个网站,我刚刚使用LinqToSQL实现了SqlCacheDependency,就像这样Sql server 我还应该在SQL分析器中看到查询命中吗?,sql-server,asp.net-mvc,linq-to-sql,caching,Sql Server,Asp.net Mvc,Linq To Sql,Caching,我目前正在构建一个网站,我刚刚使用LinqToSQL实现了SqlCacheDependency,就像这样 public IQueryable<VictoryList> GetVictoryList() { string cacheKey = HttpContext.Current.User.Identity.Name + "victoryCacheKey"; IQueryable<VictoryList
public IQueryable<VictoryList> GetVictoryList()
{
string cacheKey = HttpContext.Current.User.Identity.Name + "victoryCacheKey";
IQueryable<VictoryList> cachednews = (IQueryable<VictoryList>)HttpContext.Current.Cache.Get(cacheKey);
if (cachednews == null)
{
var results = from v in _datacontext.ViewVictoryLists
orderby _datacontext.GetNewId()
select new VictoryList
{
MemberID = v.MemberID,
Username = v.Aspnetusername,
Location = v.Location,
DaimokuGoal = v.DaimokuGoal,
PreviewImageID = v.PreviewImageID,
TotalDaimoku = v.TotalDaimoku,
TotalDeterminations = v.TotalDeterminations,
DeterminationID = v.DeterminationID,
DeterminationName = v.DeterminationName
};
SqlCacheDependency dependency =
new SqlCacheDependency(_datacontext.GetCommand(results) as SqlCommand);
HttpContext.Current.Cache.Add(cacheKey, results, dependency, DateTime.MaxValue,
TimeSpan.Zero, CacheItemPriority.Normal, null);
return results.ToList().AsQueryable();
}
return cachednews;
}
public IQueryable GetVictoryList()
{
字符串cacheKey=HttpContext.Current.User.Identity.Name+“victoryCacheKey”;
IQueryable cachednews=(IQueryable)HttpContext.Current.Cache.Get(cacheKey);
if(cachednews==null)
{
var results=来自_datacontext.viewVictoryList中的v
orderby_datacontext.GetNewId()
选择新的胜利列表
{
MemberID=v.MemberID,
用户名=v.Aspnetusername,
位置=v.位置,
DaimokuGoal=v.DaimokuGoal,
PreviewImageID=v.PreviewImageID,
TotalDaimoku=v.TotalDaimoku,
总测定值=v.总测定值,
DeterminationID=v.DeterminationID,
DeterminationName=v.DeterminationName
};
SqlCacheDependency依赖项=
新的SqlCacheDependency(_datacontext.GetCommand(results)作为SqlCommand);
HttpContext.Current.Cache.Add(cacheKey、结果、依赖项、DateTime.MaxValue、,
TimeSpan.Zero,CacheItemPriority.Normal,null);
返回results.ToList().AsQueryable();
}
返回缓存新闻;
}
它似乎在工作,因为速度明显加快,特别是在一些复杂的查询上。然而,当我在SQLProfiler中查看时,我仍然看到查询在运行,我使用的是SqlCacheDependency的CommandBroker模式。即使数据显然来自缓存对象,我是否仍应该看到该查询?我认为问题在于您正在缓存中存储IQueryable,然后cachednews包含一个命中数据库的IQueryable 尝试以下更改
public IQueryable<VictoryList> GetVictoryList() {
// ...
if (cachednews == null)
{
var results = from // ...
results = results.ToList().AsQueryable(); // force query execution
SqlCacheDependency dependency = // ...;
HttpContext.Current.Cache.Add(cacheKey,
results, // now just the result are stored
dependency,
DateTime.MaxValue,
TimeSpan.Zero,
CacheItemPriority.Normal,
null);
return results;
}
return cachednews;
}
public IQueryable GetVictoryList(){
// ...
if(cachednews==null)
{
var results=from/。。。
results=results.ToList().AsQueryable();//强制执行查询
SqlCacheDependency=/。。。;
HttpContext.Current.Cache.Add(cacheKey,
results,//现在只存储结果
附属国,
DateTime.MaxValue,
时间跨度0,
缓存项优先级,正常,
无效);
返回结果;
}
返回缓存新闻;
}
我认为问题在于您将IQueryable存储在缓存中,然后cachednews包含一个命中数据库的IQueryable
尝试以下更改
public IQueryable<VictoryList> GetVictoryList() {
// ...
if (cachednews == null)
{
var results = from // ...
results = results.ToList().AsQueryable(); // force query execution
SqlCacheDependency dependency = // ...;
HttpContext.Current.Cache.Add(cacheKey,
results, // now just the result are stored
dependency,
DateTime.MaxValue,
TimeSpan.Zero,
CacheItemPriority.Normal,
null);
return results;
}
return cachednews;
}
public IQueryable GetVictoryList(){
// ...
if(cachednews==null)
{
var results=from/。。。
results=results.ToList().AsQueryable();//强制执行查询
SqlCacheDependency=/。。。;
HttpContext.Current.Cache.Add(cacheKey,
results,//现在只存储结果
附属国,
DateTime.MaxValue,
时间跨度0,
缓存项优先级,正常,
无效);
返回结果;
}
返回缓存新闻;
}