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Data object stuck in L2 cache
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Zdeněk
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Zdeněk asked on 13 May 2012, 02:39 PM
Hi,
before all I must say Telerik OpenAccess is amazing ORM! I love to work with it.

But... now I have problem with object deletion. I have three tables in MS SQL 2008 database in N:M relation. Files, Baskets and BasketFiles table. I'm sending screenshot from Visual Designer where is realtion clear.

When I want to delete row from BasketFiles table, row is deleted, but still persists in cache. Another attempt to delete this object causes error. When I shut down L2 cache, everything is all right.

Here is code causing problems (it is called in ItemCommand of RadGrid) I made code a little more verbose for clarity:
Select Case e.CommandName
   Case "Delete"
     Dim basketFileToDeleteId = CInt(e.Item.OwnerTableView.DataKeyValues(e.Item.ItemIndex)("BasketFileId"))
     Dim basketFileToDelete = (From q In dc.BasketFiles Where q.BasketFileId = basketFileToDeleteId).FirstOrDefault
     dc.Delete(basketFileToDelete)
     dc.SaveChanges()

Can you, please, tell me, where could be problem? I tried also clear cache with dc.Cache.Release and dc.Cache.Release(BasketFiles) command, but with no luck.

Thank you,
Zdenek

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Damyan Bogoev
Telerik team
answered on 15 May 2012, 06:31 AM
Hi Zdenek Plachy,

You should use the IObjectScope.Evict(entity) in order to remove entries from the second level cache:

Select Case e.CommandName
   Case "Delete"
     Dim basketFileToDeleteId = CInt(e.Item.OwnerTableView.DataKeyValues(e.Item.ItemIndex)("BasketFileId"))
     Dim basketFileToDelete = (From q In dc.BasketFiles Where q.BasketFileId = basketFileToDeleteId).FirstOrDefault
     Dim key = dc.CreateObjectKey(entity)
     dc.LevelTwoCache.Evict(key)
     dc.Delete(basketFileToDelete)
     dc.SaveChanges()

The IsCached(IObjectId) method can be used to check if the values for a certain object are cached.

Hope that helps. If any other questions arise, do not hesitate to contact us back.

All the best,
Damyan Bogoev
the Telerik team
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