Update from Query

Definition

UPDATE all rows from the database using a LINQ Query without loading entities in the context.

A UPDATE statement is built using the LINQ expression and directly executed in the database.

Example

// UPDATE all customers that are inactive for more than two years
context.Customers
    .Where(x => x.Actif && x.LastLogin < DateTime.Now.AddYears(-2))
    .UpdateFromQuery(x => new Customer {Actif = false});
	
// UPDATE customers by id
context.Customers.Where(x => x.ID == userId).UpdateFromQuery(x => new Customer {Actif = false});

Purpose

Updating entities using SaveChanges normally require to load them first in the ChangeTracker. These additional round-trips are often not necessary.

UpdateFromQuery give you access to directly execute a UPDATE statement in the database and provide a HUGE performance improvement.

Performance Comparisons

Operations 1,000 Entities 2,000 Entities 5,000 Entities
SaveChanges 1,000 ms 2,000 ms 5,000 ms
UpdateFromQuery 1 ms 1 ms 1 ms

FAQ

Why UpdateFromQuery is faster than SaveChanges, BulkSaveChanges, and BulkUpdate?

UpdateFromQuery execute a statement directly in SQL such as UPDATE [TableName] SET [SetColumnsAndValues] WHERE [Key].

Other operations normally require one or multiple database round-trips which make the performance slower.