When getting all entities from the database table as a JSON tree, some entities . Viewed 622 times 1 I have a table "CatalogItem" with a self-referential ParentId-Id relationship. I am a freelance .NET Core back-end developer. Entity Framework Core 5 Table-per-Type and - Medium Should be out in a few weeks. The MenuId links the items to a specific menu. The most familiar cases are organizations, products built from parts and other products, file systems etc. This is how to load data from DB as a tree of folders, flatten it as a plain list of folder "nodes", and get some details related to tree structure like node . Get all children recursively in Entity Framework Core I have to create hierarchical or tree view or parent - child relationship out of these two DataTables. I bit of performance testing is needed to get the best approach. Hello Jon, Using SQL Server HierarchyId with Entity Framework Core The next section gives you changes to the eight steps to set up your database shown in the part 1 article. Because a hierarchical multi-tenant application has sub-tenants, then the name and DataKey of a tenant are a combination of the names / DataKeys of the parent tenants. Using a UDF in the query filter is a great idea, but one thing to think about is how many times the query filter is called? By default, when two sibling entity types in the hierarchy have a property with the same name, they will be mapped to two separate columns. Entity Framework Core The HierarchyId data type was introduced with SQL Server 2008. For example, the RssUrl column is nullable because regular Blog instances do not have that property. What is this political cartoon by Bob Moran titled "Amnesty" about? While a user linked to a top-level tenant can all the sub-tenants data. Below is the C# LINQ Lambda query to achieve the same. I think the idea of including the tenantid with the claims and not the DataKey is good. For instance, the top-level XYZ tenant could see all the data in the businesses below, but each individual business cant see the data of the other businesses the Setting the scene section gives more examples of where a hierarchical multi-tenant approach can be useful. How to rotate object faces using UV coordinate displacement, Covariant derivative vs Ordinary derivative. The big advantage of a hierarchical multi-tenant applications is that higher level tenant can see all the data in the lower levels. Using a NoSQL database like Azure Cosmos DB, there are different needs. { We provide programming data of 20 most popular languages, hope to help you! Querying Data - EF Core | Microsoft Learn Entity Framework Recursive Relationship Hierarchical Data Entity Framework Core - Table per Hierarchy - csharp.christiannagel.com This simple change to the EF Cores global query filter in your application (and some extra AuthP code) changes your application from being a normal (single level) multi-tenant to a hierarchical multi-tenant. The LINQ required to retrieve the menu items is very simple: And the SQL that this generates is also very simple: You could choose to explicitly include the Children navigational property: This will alter the SQL to the following: It enables population of the Children properties and is only necessary if you needed to reference them in your code. MenuId = c.Int(nullable: ), Im currently working on an article about interesting things you can do with users claims and I have another (more complex) way to update the DataKey of all the logged-in users. If you don't want to expose a DbSet for one or more entities in the hierarchy, you can also use the Fluent API to ensure they are included in the model. I know you were asking for your application, but is a real issue for my library too so I had to think this through. Hierarchical Query in SQL with C# and Entity Framework Core If you are employing bulk configuration you can retrieve the column name for a specific table by calling GetColumnName(IProperty, StoreObjectIdentifier). In our systems we speak about millions of records being moved around. thanks a lot. If you have a business case like that, then you should consider a hierarchical multi-tenant approach. A collection of articles and tutorials on web development with ASP.NET by Mike Brind. This property can be configured like any other: Finally, the discriminator can also be mapped to a regular .NET property in your entity: When querying for derived entities, which use the TPH pattern, EF Core adds a predicate over discriminator column in the query. Entity Framework Core 5 - Pitfalls To Avoid and Ideas to Try My implementation did not have hierarchies, but I think we will need them in the future. ASP.NET Core: Three(+1) ways to refresh the claims of a logged-in user, How to take an ASP.NET Core web site Down for maintenance, How to turn an ASP.NET Core appsettings.json file into a fast-read database. The following sample exposes a DbSet for Blog and its subclass RssBlog. Making statements based on opinion; back them up with references or personal experience. Create Hierarchical data using C# LINQ - Dot Net For All Why bad motor mounts cause the car to shake and vibrate at idle but not when you give it gas and increase the rpms? This simple change to the EF Core's global query filter in your application (and some extra AuthP code) changes your application from being a normal (single level) multi-tenant to a hierarchical multi-tenant. MenuId = c.Int(nullable: ), Table-per-concrete-type (TPC) is supported by EF6, but is not yet supported by EF Core. Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Also, you must implement the MoveHierarchicalTenantDataAsync method in your ITenantChangeService code, because AuthP allows you to move a tenant, with any sub-tenants, to another place in the hierarchical tenants see next section for a diagram of what a move can do. EF will create the following database schema for the model above. Why should you not leave the inputs of unused gates floating with 74LS series logic? Finally, the data was retrieved from the database and a recursive function was used to manage the display of the hierarchical data. Modeling Most SQL Relationships In Entity Framework Core What's the best way to roleplay a Beholder shooting with its many rays at a Major Image illusion? Typically, the sub-tenants are created a business grouping or geographic areas, or both. }. A hierarchical multi-tenant is useful when the data, or users, are managed in sections. Connect and share knowledge within a single location that is structured and easy to search. I mean that such an operation should go in a transaction and it could take a LONG time. There are a number of existing items on the Internet that cover the same topic, but most of them seem unnecessarily complex and don't include any information about displaying the data once it has been retrieved. Hierarchies are very common in our lives and therefore in the problems we need to solve. I see it as a great feature if you do hierarchies, but I was thinking about the downtime when doing it. You can see the full list of all the eight steps in Part 1 so I have listed just the changed steps, but you MUST apply all the steps in the Part 1 article its just the following steps are different. (blog as RssBlog).Url : null. This story is one of the possible ways to do it. }) The AuthPs ITenantAdminService handles both a normal (single-level) and a hierarchical multi-tenant. One of the very common questions I am getting from .NET community is how to configure and use the tree structures in EF Core . NewId and not the Primary Key Id. Table-per-concrete-type (TPC) is supported by EF6, but . As each item is rendered, the entire collection is passed back into the BuildMenu method with the parentId parameter set to the id of the current item, so that a check for any children belonging to the current item can be performed. This article explores how to use Entity Framework 6 to manage the retrieval and display of hierarchical data such as you might find in a menu system. This allows you to move a tenant, with all of its sub-tenants, to another level in your tenants. Here's the Up method that is generated by Code First Migrations for the two entities: The ParentMenuItemId is nullable, which is what enables top level elements to exist. Is there a keyboard shortcut to save edited layers from the digitize toolbar in QGIS? Inheritance Strategy in Entity Framework Core 5 - Medium How to enable EF Core to return hierarchical data (self referencing table) with another KeyColumn. What is the difference between an "odor-free" bully stick vs a "regular" bully stick? To learn more, see our tips on writing great answers. More info about Internet Explorer and Microsoft Edge, GetColumnName(IProperty, StoreObjectIdentifier), See the performance docs for more information. If Blog has any other subclass, it will not be included in the model. When an hierarchy is stored in a database table, it's usually represented by rows referencing parent rows, recursively. Modified 3 years, 5 months ago. In the TPT mapping pattern, all the types are mapped to individual tables. # sql # csharp # efcore # dotnet Hierarchies are very common in our lives and therefore in the problems we need to solve. Step 2 The table-per-type (TPT) feature was introduced in EF Core 5.0. 123.) of the tenant and EF Cores global query filter uses an exact match, to filter each tenant e.g. Single-table hierarchical data in EF Core. If a specific item is a top level item, the value will be null. The diagram below shows an example of a move, where a new California tenant is added and then the LA and SanFran tenants are moved into the California tenant. That will make sure the users wont be able to access the tenant data that has been changed until the transaction has finished. Two years after the client project I wrote an article called A better way to handle authorization in ASP.NET Core which improved on some the client project. Explicit Loading in EF Core is a technique we query and load the related entities with an explicit call. Implementing a recursive projection query in C# and Entity Framework Core For instance, the part 2 article has a lot of administration features which I know are needed, and the part 3 article adds an important feature of offering different versions of your multi-tenant application to users. Hierarchical data using C# LINQ. The actual details of how a type hierarchy is mapped are provider-dependent; this page describes inheritance support in the context of a relational database. Finally, the data was retrieved from the database and a recursive function was used to manage the display of the hierarchical data. The structure in which the solution that I will present you work is a structure that look like a tree. 503), Mobile app infrastructure being decommissioned, Getting hierarchical data from self referencing table in SQL 2005, How to unapply a migration in ASP.NET Core with EF Core, How to enable CORS in ASP.net Core WebAPI. You can also use .HasBaseType((Type)null) to remove an entity type from the hierarchy. When I was asked to design and build a hierarchical multi-tenant application for a client, I found the project a challenge and I really enjoyed working on it. The database table looks like this: Each menu item has a ParentMenuItemId which is nullable. Using SQL Server HierarchyId with Entity Framework Core - YouTube . For example, a menu item might have a number of child menu items, each of which in turn might have one or more children, each of which also might have one or more children, ad infinitum. 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