Should I still see the query hit in SQL Profiler? - sql-server

Question

I am currently building a web site and I just implemented SqlCacheDependency using LinqToSQL like so.
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;
}
It appears to be working as things are noticbly faster especially on some complex queries, however while looking at things in SQLProfiler I still see the query run through, I'm using the CommandBroker mode of SqlCacheDependency. Should I still see the query even though the data is obviously coming from a cached object?

Answer 1

I think that the problem is that you are storing IQueryable's in your cache, and then cachednews contains an IQueryable that hits the database.
Try the following changes.
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;
}