How to include related data in eager loading?

How to include related data in eager loading?

When applying Include to load related data, you can add certain enumerable operations to the included collection navigation, which allows for filtering and sorting of the results. Supported operations are: Where, OrderBy, OrderByDescending, ThenBy, ThenByDescending, Skip, and Take.

What are the supported operations in eager loading?

Supported operations are: Where, OrderBy, OrderByDescending, ThenBy, ThenByDescending, Skip, and Take. Such operations should be applied on the collection navigation in the lambda passed to the Include method, as shown in example below: Each included navigation allows only one unique set of filter operations.

Is it possible to load multiple Navigations in EF?

It doesn’t mean you’ll get redundant joins; in most cases, EF will combine the joins when generating SQL. You can also load multiple navigations using a single Include method. This is possible for navigation “chains” that are all references, or when they end with a single collection.

How to load multiple levels of related data?

The following example loads all blogs, their related posts, and the author of each post. You can chain multiple calls to ThenInclude to continue including further levels of related data. You can combine all of the calls to include related data from multiple levels and multiple roots in the same query.

What is the difference between lazy loading and eager loading?

With Lazy Loading, the EF loads only the data for the primary object in the LINQ query (the Friend) and leaves the Contact object. Lazy Loading brings in the related data on an as-needed basis, meaning that when something touches the Contact property of a Friend, EF loads the data by sending an additional query to the database.

Is there an eager loading method in Entity Framework?

EF Core supports additional method IncludeThen for eager loading. Learn about it here. Learn how Entity Framework 6.x supports lazy loading in the next chapter.

How does eager loading work in EF Core?

The following query first loads a subject and then loads the books related to that subject using the Load () extension method. EF Core enables you to load related entities via navigation properties. Eager loading helps you to load the related entities as part of the initial query.

What’s the difference between eager and lazy loading?

Eager loading is the opposite of Lazy loading but Explicit loading is similar to lazy loading, except that: you explicitly retrieve the related data in code; it doesn’t happen automatically when you access a navigation property.

How to load multiple tags in EF Core?

For example, Blog -> Posts -> Author and Blog -> Posts -> Tags. It doesn’t mean you’ll get redundant joins; in most cases, EF will combine the joins when generating SQL. You can also load multiple navigations using a single Include method.

How to eagerly load related entities in Microsoft Docs?

Eager loading is achieved by use of the Include method. For example, the queries below will load blogs and all the posts related to each blog. Include is an extension method in the System.Data.Entity namespace so make sure you are using that namespace. It is also possible to eagerly load multiple levels of related entities.

Which is an example of eager loading in Gorm?

GORM allows eager loading relations in other SQL with Preload, for example: Preload loads the association data in a separate query, Join Preload will loads association data using inner join, for example: NOTE Join Preload works with one-to-one relation, e.g: has one, belongs to