Blog Options
Archive
<< July 2026 >>-
Friday 10
- A New Home for TMS Documentation -
Thursday 9
- Filtering in Delphi: Visual Filter Building -
Friday 3
- TMS FNC Family Updated with a New Install Experience -
Thursday 2
- TMS FNC UI Pack 7.2 -
Wednesday 1
- TMS FNC Core to help to make the free QR and Barcode generation component cross-framework and cross-platform
- TMS BIZ July 2026: External Logins, Custom Password Hashing, and More
- Login with Google, Microsoft and More: Identity Brokering in TMS Sphinx
Authors
- Bernard Roussely (3)
- Wagner Landgraf (103)
- Dennis Röhner (1)
- Roman Yankovsky (2)
- Bart Holvoet (45)
- Aaron Decramer (85)
- Pieter Scheldeman (141)
- Nancy Lescouhier (32)
- Adrian Gallero (35)
- Bruno Fierens (460)
- Marcos Douglas B. Santos (5)
- Bernard (4)
- Bradley Velghe (36)
- Andrew Simard (86)
- Holger Flick (15)
- Gjalt Vanhouwaert (47)
- Tunde Keller (38)
- Masiha Zemarai (117)
Blog
All Blog Posts | Next Post | Previous Post
My Top 10 Aurelius Features - #2 LINQ Projections
Monday, March 6, 2017
LINQ Projections is the runner-up feature of My Top 10 Aurelius Features. It's a sort of "sequel" of the #5 feature LINQ Expressions and Paging, and you can see it in action in the video below.You could consider that "LINQ Expressions" and "LINQ Projections" are just sides of the same feature. That's not incorrect indeed. But LINQ is a so nice feature of TMS Aurelius that it deserved to be split in two parts. And the reason that projections (and not expression) is ranked higher is just because it's at the core of LINQ.
The coolness of LINQ is more due projections than expressions in my opinion. An expression is actually just a comparison of two projections. It's in the projections that all complexity lies in. And it allows beautiful and complex queries like the following to be written:
Get the unit price and quantity of each order detail, multiply them, and group the sum of it by the year of Order Date.
Manager.Find<TOrder>
.CreateAlias('OrderDetails', 'd')
.Select(TProjections.ProjectionList
.Add(Linq['OrderDate'].Year.Group.As_('Group'))
.Add((Linq['d.UnitPrice'] * Linq['d.Quantity']).Sum.As_('Value'))
)
.Where(Linq['OrderDate'].Year._In([1997, 1998]))
.OrderBy('Value')
Cool, isn't it? You can see queries like the ones above in action, by watching the video above. Don't forget to subscribe to our YouTube channel to get notified about upcoming videos!
Wagner Landgraf
This blog post has not received any comments yet.
All Blog Posts | Next Post | Previous Post