从EF Core 7.0 开始,可以使用 ExecuteUpdate 和ExecuteDelete 方法更高效地执行相同的操作:c# 复制 context.Employees.ExecuteUpdate(s => s.SetProperty(e => e.Salary, e => e.Salary + 1000)); 这会将以下 SQL 语句发送到数据库:SQL 复制 UPDATE [Employees] SET [Salary] = [Salary] + 1000; 此...
EF Core 可讓您輕鬆地查詢實體實例,然後在程式碼中使用這些實例。 不過,查詢實體實例經常會從資料庫提取超過必要資料。 請考量下列各項:C# 複製 await foreach (var blog in context.Blogs.AsAsyncEnumerable()) { Console.WriteLine("Blog: " + blog.Url); } ...
In fact, this performance issue is thesecond most highly-voted issuein the EF Core repo; and as with most performance problems, your application may be suffering from it without you knowing about it. We clearly need a better solution for translating the LINQ Contains operator when the collectio...
EF Core 9.0 EF Core 8.0 EF Core 7.0 EF Core 6.0 High-level plan What's new? Breaking changes Out of support DbContext configuration and initialization Create a model Manage database schemas Query data Save data Change tracking Logging, events, and diagnostics Testing Performance Miscellaneous Data...
In EF Core 8.0, the UseSqlReturningClause method has been introduced to explicitly revert back to the older, less efficient SQL. For example:C# Copy protected override void OnModelCreating(ModelBuilder modelBuilder) { modelBuilder.Entity<Blog>() .ToTable(tb => tb.UseSqlReturningClause(...
While ExecuteUpdateAsync and ExecuteDeleteAsync are commonly used to update or delete many rows at the same time (i.e. “bulk” changes), they can also be useful for efficient single row changes. For example, consider the common pattern to delete an entity in an ASP.NET Core application: ...
@gavinroderick: Update efficient-querying.md @ErikEJ: Remove "ConnectRetryCount", no longer needed due to added overload of SqlConnection.Open being used @mrlife: Update value-conversions.md Many thanks to all our contributors! EF Core Model building Add pre-convention model configuration infras...
@Martinn2EF Core already does a form of bulk insert - if you add multiple instances and then call SaveChanges, all insertions will happen in a single roundtrip, which is quite efficient. More importantly, bulk update and delete are very similar in that the user provides a LINQ predicate def...
That command created a migration file, but I’m not going to create my database using the migration commands—when I deploy my app, I don’t want to have to execute migrations commands to create or update the database. Instead, I’ll use the EF Core Database.Migrate method. Where this...
-Bulk operations (Insert, Update, Delete, Read, Upsert, Sync, Truncate) and -Batch ops (Delete, Update). Library is Lightweight and very Efficient, having all mostly used CRUD operation. Was selected in top 20 EF Core Extensions recommended by Microsoft. Current version is using EF Core ...