How to query parent-child column in a table using entityspaces ORM

Question

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I have a table "ParentChild" like this:

https://i.stack.imgur.com/ybypN.png[^]

I want to get all childs from a parent by using EntitySpaces ORM but i can not do

What I have tried:

This is my code:

ParentChildCollection pc = new ParentChildQuery("c", out var c)
            .Where(c.ParentId==0)
            .InnerJoin<ParentChildQuery>("e", out var e)
            .On(c.ParentId== e.Id)
            .ToCollection<DeviceCategoryCollection>();

But i dont get expected result.

Everybody can help me? Thanks

Posted 14-Dec-20 21:18pm

Bill Lee Vn

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Comments

Richard Deeming 15-Dec-20 4:15am

You have already posted this on the GitHub project, which is the correct place to ask this:
How to implement Recursive Queries Using Common Table Expressions · Issue #26 · MikeGriffinReborn/EntitySpaces · GitHub[^]

Bill Lee Vn 15-Dec-20 6:03am

Yes, i asked for this problem there but it seems that Mike Griffine has been offline long time. So i post my question here with hope that someone has experiences with EntitySpaces can help me

[no name] 15-Dec-20 10:36am

Maybe just try retrieving children for a given key. The size and complexity of an SQL / LINQ query is directly proportional to the lack of experience of the coder.

Bill Lee Vn 15-Dec-20 20:31pm

yes, this is the fist time i work with sql server

[no name] 15-Dec-20 23:12pm

From the looks of it, you have a one-to-one relationship, with one orphan. You have a "database integrity" problem, and "Entity Spaces" doesn't seem to be doing you any good.

Bill Lee Vn 18-Dec-20 4:50am

Thank you!

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