I currently have the following code in my project
public List<PermissionValue> GetUnderlyingPermissionsForUser(string userName, int guiPermissionTypeId, int productTypeId)
{
using (CliVeEntities db = new CliVeEntities())
{
var listUnderlyings = (from gui in db.GuiPermissionUnderlying
join bue in db.BranchUsersExternal on gui.BranchUsersId equals bue.BranchUsersID
join bu in db.BranchUsers on bue.BranchUsersID equals bu.BranchUsersId
where bu.UserName == userName && gui.ViewTypeId == guiPermissionTypeId
&& gui.UnderlyingId.HasValue
&& !gui.SectorId.HasValue
&& gui.ProductTypeId == null
&& gui.ProductGroupId == null
select new PermissionValue { Id = gui.UnderlyingId.Value, Visible = gui.value}).ToList<PermissionValue>();
var listUnderlyingsProductGroup = (from gui in db.GuiPermissionUnderlying
join bue in db.BranchUsersExternal on gui.BranchUsersId equals bue.BranchUsersID
join bu in db.BranchUsers on bue.BranchUsersID equals bu.BranchUsersId
join pg in db.ProductGroup on gui.ProductGroupId equals pg.ProductGroupId
join pt in db.ProductType on pg.ProductGroupId equals pt.ProductGroupId
where bu.UserName == userName && gui.ViewTypeId == guiPermissionTypeId
&& gui.UnderlyingId.HasValue
&& !gui.SectorId.HasValue
&& pt.ProductTypeId == productTypeId
select new PermissionValue { Id = gui.UnderlyingId.Value, Visible = gui.value }).ToList<PermissionValue>();
var listUnderlyingsProductType = (from gui in db.GuiPermissionUnderlying
join bue in db.BranchUsersExternal on gui.BranchUsersId equals bue.BranchUsersID
join bu in db.BranchUsers on bue.BranchUsersID equals bu.BranchUsersId
where bu.UserName == userName && gui.ViewTypeId == guiPermissionTypeId
&& gui.UnderlyingId.HasValue
&& !gui.SectorId.HasValue
&& gui.ProductTypeId == productTypeId
select new PermissionValue { Id = gui.UnderlyingId.Value, Visible = gui.value }).ToList<PermissionValue>();
var listUnderlyingsForSectors = (from gui in db.GuiPermissionUnderlying
join bue in db.BranchUsersExternal on gui.BranchUsersId equals bue.BranchUsersID
join bu in db.BranchUsers on bue.BranchUsersID equals bu.BranchUsersId
join u in db.Underlying on gui.SectorId equals u.SectorId
where bu.UserName == userName && gui.ViewTypeId == guiPermissionTypeId
&& !gui.UnderlyingId.HasValue
&& gui.ProductTypeId == null
&& gui.ProductGroupId == null
select new PermissionValue { Id = u.UnderlyingId, Visible = gui.value }).ToList<PermissionValue>();
var listUnderlyingsForSectorsProductGroup = (from gui in db.GuiPermissionUnderlying
join bue in db.BranchUsersExternal on gui.BranchUsersId equals bue.BranchUsersID
join bu in db.BranchUsers on bue.BranchUsersID equals bu.BranchUsersId
join u in db.Underlying on gui.SectorId equals u.SectorId
join pg in db.ProductGroup on gui.ProductGroupId equals pg.ProductGroupId
join pt in db.ProductType on pg.ProductGroupId equals pt.ProductGroupId
where bu.UserName == userName && gui.ViewTypeId == guiPermissionTypeId
&& !gui.UnderlyingId.HasValue
&& pt.ProductTypeId == productTypeId
select new PermissionValue { Id = u.UnderlyingId, Visible = gui.value }).ToList<PermissionValue>();
var listUnderlyingsForSectorsProductType = (
from gui in db.GuiPermissionUnderlying
join bue in db.BranchUsersExternal on gui.BranchUsersId equals bue.BranchUsersID
join bu in db.BranchUsers on bue.BranchUsersID equals bu.BranchUsersId
where bu.UserName == userName && gui.ViewTypeId == guiPermissionTypeId
&& !gui.UnderlyingId.HasValue
&& gui.SectorId.HasValue
&& gui.ProductTypeId == productTypeId
select new PermissionValue { Id = gui.UnderlyingId.Value, Visible = gui.value }).ToList<PermissionValue>();
var mergeList1 = MergeAndDistinctList(listUnderlyings, listUnderlyingsProductType);
var mergeList2 = MergeAndDistinctList(mergeList1, listUnderlyingsProductGroup);
var mergeList3 = MergeAndDistinctList(mergeList2, listUnderlyingsForSectors);
var mergeList4 = MergeAndDistinctList(mergeList3, listUnderlyingsForSectorsProductType);
var resultMergeList = MergeAndDistinctList(mergeList4, listUnderlyingsForSectorsProductGroup);
return resultMergeList;
And This is the code for my MergeAndDistinctList function
protected List<PermissionValue> MergeAndDistinctList(List<PermissionValue> listPrimary, List<PermissionValue> listSecondry)
{
List<PermissionValue> listMergedAndDistinct = new List<PermissionValue>();
listMergedAndDistinct.AddRange(listPrimary);
var filter = listPrimary.Select<PermissionValue, int>(p => p.Id);
listMergedAndDistinct.AddRange(listSecondry.Where<PermissionValue>(p => !filter.Contains(p.Id)).Select(p => p));
return listMergedAndDistinct;
}
My problem with my GetUnderlyingsForClient() code is that it hits the database multiple times. If this method gets hit quite a lot then this could translate to multiple calls to the database.
Does anybody know of any ways to make this code more efficient and reduce the amount of DB calls i have to make.
It seems that you make a lot of queries on the same table (a in your case)
To limit database queries, you can get all data needed in a local list and use this list for your multiple queries like this :
var MyBaseList = db.A.ToList();
var listUnderlyings = (from a MyBaseList [...]
var listUnderlyingsProductGroup = (from a MyBaseList [...]
And for limit the data retrieval, filter MyBaseList to get only lines used by following queries.
You could Union
your queries following this simplified pattern:
(from a in As where a.Id > 0 select a)
.Union(
from a in As where a.Name == "a" select a)
.Union(
...
)
.Select(a => new { a.x, a.y })
.Distinct()
The Union
is the merge part of your MergeAndDistinctList and the Distinct
, ehh, the distinct part. The nice thing is: the Distinct is carried out over the projection (Id and Visible in your case).
Everything should be carried out in one (monster) query now, without the intermediate forced execution that is caused by the AddRange
in MergeAndDistinctList.
Looking at your queries I have a feeling that you could do with a smaller number of them by combining some conditions, but that's up to you.
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