When EF Core creates the SQL DELETE command, it includes a WHERE clause with ConcurrencyToken. If the SQL DELETE command results in zero rows affected:The ConcurrencyToken in the SQL DELETE command doesn't match ConcurrencyToken in the database. A DbUpdateConcurrencyException exception is thrown. ...
I would like to some minor modifications to query (like WHERE clauses). Would this be possible in EF 5? Anonymous February 15, 2012 @Vladimir: DbExpression trees become publically constructible in the EF core libraries included in .NET 4.5. You might want to take a look at DbExpression...
using Microsoft.EntityFrameworkCore; // 定义实体类 public class Order { public int OrderId { get; set; } public string OrderNumber { get; set; } public List<OrderDetail> OrderDetails { get; set; } } public class OrderDetail { public int OrderDetailId { get; set; } public int OrderI...
my issue has more to do with the Include and Where clause than Tracking vs. No Tracking and in addition even more to do with the performance comparison between EF Core vs. EF6 so the title should probably be changed to reflect this, if you agree that there is an issue with EF Core....
This worked fine until moving from EF core 5 to EF core 6. With EF core 6 the result list contains some null values (which should not be the case because the where condition asks for not null). Is there some breaking change / limitation in EF core 6 I'm not aware of or is this...
(Microsoft.EntityFrameworkCore.Database.Command) Executing SQL query for container 'UserSessionContext' in partition '["Microsoft","99a410d7-e467-4cc5-92de-148f3fc53f4c",7.0]' [Parameters=[]] SELECT c FROM root c WHERE ((c["Discriminator"] = "UserSession") AND CONTAINS(c["Username"]...
The dotnet-ef tool must be installed before executing EF8 Core migration or scaffolding commands. To install the tool globally, use: Copy dotnet tool install --global dotnet-ef --version 8.0.0-preview.1.23111.4 If you already have the tool installed, you can upgrade it with the following ...
When the Contains operator is used with a subquery, EF Core now generates better queries using SQLINinstead ofEXISTS; aside from producing more readable SQL, in some cases this can result in dramatically faster queries. For example, consider the following LINQ query: ...
Note that in addition to the PersonId in the WHERE clause, EF Core has added a condition for Version as well; this only modifies the row if the Version column hasn't changed since the moment we queried it. In the normal ("optimistic") case, no concurrent update occurs and the UPDATE ...
EF核心存储的where Func不生成SQL where子句是指在Entity Framework Core中,使用where Func进行查询时,有时候不会生成SQL的where子句。 在EF Core中,我们可以使用Lambda表达式或Func委托来定义查询条件。例如,我们可以使用以下代码来查询名字为"John"的用户: