Entity Framework Core(7) 批量更新

Question

How to bulk update entities using EF Core(7)?

I do not want to load entities from the DB server, modify properties and update. I just want to EF generate appropriate UPDATE statement.

Answer 1

As the accepted answer pointed, Entity Framework Core doesn't support to updates directly in the database yet.

Disclaimer : I'm the owner of the project Entity Framework Plus

However, EF+ already supports Query Batch Update without loading entities in the context (Support: EF Core, EF6, EF5)

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

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

Wiki: Entity Framework Batch Update

Answer 2

This is the EF7 ExecuteUpdateAsync syntax:

var updatedColumns = 
    await
    context
    .Blog
    .ExecuteUpdateAsync(p => p.SetProperty(s => s.Title, s => "Wow"));

Learn more about bulk operations at What's new on EF7, ExecuteUpdate and ExecuteDelete (Bulk updates) doc.

Answer 3

At the day I am posting this answer, with the information in my possession, it looks like it is a work in progress

See https://github.com/aspnet/EntityFramework/issues/795

EF does not provide a batch update mechanism. A proposal is below. Context.Customers.Update().Where.( c => c.CustType ==“New”).Set( x => x.CreditLimit=0)

Will you consider this feature? More details here: https://entityframework.codeplex.com/workitem/52

Answer 4

It is released in efcore 7

await context.Blogs.ExecuteUpdateAsync(
    s => s.SetProperty(b => b.Name, b => b.Name + " *Featured!*"));

Generates the appropriate:

UPDATE [b]
    SET [b].[Name] = [b].[Name] + N' *Featured!*'
FROM [Blogs] AS [b]

Examples got from official dos .