What is lazy loading and eager loading in C#?

Asked By: Marcial Vihrev | Last Updated: 19th April, 2020
Category: technology and computing databases
4/5 (125 Views . 12 Votes)
With Eager Loading, all the data is retrieved in a single query, which can then be cached to improve the Application performance. With Eager Loading, we are trading memory consumption for the database round trips. With Lazy Loading, we only retrieve just the amount of data, which we need in a single query.

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Considering this, what is lazy loading and eager loading in Entity Framework?

Lazy loading in Entity Framework is the default phenomenon that happens for loading and accessing the related entities. However, eager loading is referred to the practice of force-loading all these relations.

Likewise, what is lazy loading in Entity Framework with example? Lazy Loading in Entity Framework Lazy loading is delaying the loading of related data, until you specifically request for it. It is the opposite of eager loading. For example, the Student entity contains the StudentAddress entity.

In this manner, what is difference between eager and lazy loading?

One big difference is that EAGER fetch strategy allows to use fetched data object without session. All data is fetched when eager marked data in the object when session is connected. However, in case of lazy loading strategy, lazy loading marked object does not retrieve data if session is disconnected (after session.

What is eager load?

Eager loading is the process whereby a query for one type of entity also loads related entities as part of the query. 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.

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Is lazy loading good?

There's no bad and good for lazy loading. You have to decide if you prefer to load resources on run time or application loading times. For example - Real time usually uses a buffer to avoid allocating resources on runtime. That's the opposite of lazy loading and is beneficial for Real Time software.

What is the difference between eager loading and lazy loading in JAQL?

With Eager Loading, all the data is retrieved in a single query, which can then be cached to improve the Application performance. With Eager Loading, we are trading memory consumption for the database round trips. With Lazy Loading, we only retrieve just the amount of data, which we need in a single query.

What is lazy loading in JavaScript?

Lazy Load is a jQuery plugin written in JavaScript. It delays loading of images in long web pages. Images outside of viewport (visible part of web page) wont be loaded before user scrolls to them. This is opposite of image preloading.

What is lazy loading?

Lazy loading is a design pattern commonly used in computer programming to defer initialization of an object until the point at which it is needed. It can contribute to efficiency in the program's operation if properly and appropriately used. The opposite of lazy loading is eager loading.

What is lazy loading in C#?


Object on Demand is also called Lazy loading pattern, Lazy loading delays the initialization of object. This is a new feature of C# 4.0 and can be used when we are working with large objects when it is not in use. For avoiding the situation you can use the Lazy Loading Pattern.

What is lazy loading in MVC?

Lazy loading is a technique which loads the data on demand or when it is required. It improves efficiency and the performance of the application. Lazy loading loads the data step-by-step, when the user scrolls down the page, which is required by it.

How do I set eager loading in Entity Framework?

Eager Loading in Entity Framework. Eager loading is the process whereby a query for one type of entity also loads related entities as part of the query, so that we don't need to execute a separate query for related entities. Eager loading is achieved using the Include() method.

Is lazy loading enabled by default?

Yes, lazy loading is enabled in the Entity Framework ORM too, it is on by default in Entity Framework, so if you want to enable lazy loading in Entity Framework, you don't need to do anything. And the opposite of lazy loading is eager loading that we will see in this example.

Is lazy loading default in hibernate?

Hibernate Lazy Loads by Default
By default, Hibernate lazy loads (see here for details), which means when a persistent object is loaded into memory (say with a query or call to get or load) the associated objects are not created. Instead, Hibernate builds a proxy object as a stand-in to represent any associated object.

How does hibernate lazy loading work?


Lazy Loading in Hibernate. Hibernate applies lazy loading approach on entities and associations by providing a proxy implementation of classes. Hibernate intercepts calls to an entity by substituting it with a proxy derived from an entity's class. To know more about proxy design pattern you can refer here.

What does FetchType lazy mean?

FetchType. LAZY: It fetches the child entities lazily, that is, at the time of fetching parent entity it just fetches proxy (created by cglib or any other utility) of the child entities and when you access any property of child entity then it is actually fetched by hibernate.

What is lazy loading in Entity Framework?

Advertisements. Lazy loading is the process whereby an entity or collection of entities is automatically loaded from the database the first time that a property referring to the entity/entities is accessed. Lazy loading means delaying the loading of related data, until you specifically request for it.

What is FetchType in JPA?

The JPA FetchType defines when Hibernate gets the related entities from the database, and it is one of the crucial elements for a fast persistence tier. In general, you want to fetch the entities you use in your business tier as efficiently as possible.

How can we avoid lazy loading exception in hibernate?

Another way to avoid LazyInitializationException is to disable lazy initialization feature of hibernate for your entity classes by using lazy="false" or disable it completely for your application by using default-lazy="false".

What is lazy and eager initialization?


Lazy initialization is technique were we restrict the object creation until its created by application code. In other way eager initialization creates the object in advance and just after starting the application or module. This is helpful in case the object is mandatory and in all the cases functional.

What is @manytoone fetch FetchType lazy?

The FetchType. LAZY tells Hibernate to only fetch the related entities from the database when you use the relationship. This is a good idea in general because there's no reason to select entities you don't need for your uses case. You can see an example of a lazily fetched relationship in the following code snippets.

What is lazy initialization in hibernate?

Lazy initialization, a Hibernate problem. 1) When Hibernate reads data from the database, the data is hold in the session. You can save references to the data - for example in your HTTP request. Once the transaction is committed and the session is closed you can not load any further data with this session.