Entity Framework Core Plus Batch Update

Description

Updating using Entity Framework Core can be very slow if you need to update hundreds or thousands of entities with the same expression. Entities are first loaded in the context before being updated which is very bad for the performance and then, they are updated one by one which makes the update operation even worse.

EF+ Batch Update updates multiple rows using an expression in a single database roundtrip and without loading entities in the context.

// using Z.EntityFramework.Plus; // Don't forget to include this.

// UPDATE all users inactive for 2 years
var date = DateTime.Now.AddYears(-2);
ctx.Users.Where(x => x.LastLoginDate < date)
         .Update(x => new User() { IsSoftDeleted = 1 });

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Scenarios

• Query Criteria
• Executing Interceptor

Query Criteria

The Update IQueryable extension method updates rows matching the query criteria with an expression without loading entities in the context.

// using Z.EntityFramework.Plus; // Don't forget to include this.

// UPDATE all users inactive for 2 years
var date = DateTime.Now.AddYears(-2);
ctx.Users.Where(x => x.LastLoginDate < date)
         .Update(x => new User() { IsSoftDeleted = 1 });

Try it

Try it (Async version)

Executing Interceptor

The Executing property intercepts the DbCommand with an action before being executed.

// using Z.EntityFramework.Plus; // Don't forget to include this.

string commandText;
var date = DateTime.Now.AddYears(-2);
ctx.Users.Where(x => x.LastLoginDate < date)
         .Update(x => new User() { IsSoftDeleted = 1 },
                 x => { x.Executing = command => commandText = command.CommandText; });

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Conclusion

EF+ Batch Update is the most efficient way to update records using an expression. You drastically improve your application performance by removing the need to retrieve and load entities in your context and by performing a single database roundtrip instead of making one for every record.

Need help getting started? info@zzzprojects.com

We welcome all comments, ideas and suggestions to improve our library.