Wrong number of items afftected, No exception thrown when exception is expected (1 reply)

When there is no row in the database that is affected by an update statement, SaveChanges still returns 1 and doesn't throw DbUpdateConcurrencyException.

Here is sample code

var optionsBuilder = new DbContextOptionsBuilder<DemoContext>();
optionsBuilder.UseMySQL("Server=127.0.0.1;Port=3306;Database=EFExc;User Id=demo;Password=secret;")
.LogTo(s => Debug.WriteLine(s)).EnableSensitiveDataLogging();

var context = new DemoContext(optionsBuilder.Options);
context.Database.EnsureCreated();

var product = new Product { Name = "Test Product" };
context.Products.Add(product);

var changeCount = context.SaveChanges();
Console.WriteLine($"Inserted {changeCount} rows");

changeCount = context.Database.ExecuteSqlRaw($"Delete from products where id={product.Id}");
Console.WriteLine($"Deleted {changeCount} rows");

var count = context.Products.Count();
Console.WriteLine($"Items in database: {count}");

product.Name = "G";
changeCount = context.SaveChanges();
Console.WriteLine($"Updated {changeCount} rows");


The row that is being updated is deleted by ExecuteSqlRaw call but context.SaveChanges() still returns 1 and doesn't throw DbUpdateConcurrencyException.

This is the output I get when running the app:

Inserted 1 rows
Deleted 1 rows
Items in database: 0
Updated 1 rows