Entity Framework select write lock

Entity Framework locking a table with a select

It is possible but you have to issue the SQL you can't add the locking hint when using LINQ (as far as I know):...ObjectContext.ExecuteStoreCommand( string.Format("select 1 from [{0}] with (tablockx, holdlock) where 0 = 1", tableName)); ...If you do that in a transaction scope then you'll hold the lock ...

How can I prevent Entity Framework from locking the database?

Just to put this to bed im going to post what my solution was....I was basically looking at this from the wrong end of the problem, a transaction is used when calling ...SaveChanges()... but you can still read the database by using a method like this:...private static FrameEntities GetEntities() { FrameEntities entities = new FrameEntit...

When doing many updates in Entity Framework 4, how do you avoid locking the database?

Those locks are not created by Entity Framework. EF only supports optimistic concurrency, pessimistic locking is not supported with EF....I think the locking you experience is a result of your SQL Server configuration. Perhaps if your Transaction Isolation Level on the server is set to REPEATABLE READ this might cause the locks after each query. Bu...

Select * from Entities where Id = (select max(Id) from Entities) in Entity Framework

Can you try something like this?...using(var container = new TheModelContainer()) { string maxEntityName = container.Entities.Max(e => e.Name); Entity maxEntity = container.Entities .Where(e => e.Name == maxEntityName) .FirstOrDefault(); } ...That would select the maximum value for ...Na...

How can I lock a table on read, using Entity Framework?

I was only able to really accomplish this by manually issuing a lock statement to a table. This does a ...complete... table lock, so be careful with it! In my case it was useful for creating a queue that I didn't want multiple processes touching at once....using (Entities entities = new Entities()) using (TransactionScope scope = new TransactionSco...

Best practice to lock a record for editing while using entity framework

Best practice is to use RowVersion and Optimistic locking....Optimistic Concurrency Patterns... explained....If using Code first, then include a field in your POCO....public virtual byte[] RowVersion { get; set; } ...EF will add a Timestamp/RowVersion property to your table. It will be checked during Update. And automatically updated by the DB when...

Entity Framework - select group by, select max date

Try following... return _ctx.Notes.Select(r => new NoteBrief { Id = r.Id, Title = r.Title, Created = r.Created, ParentNoteId = r.ParentNoteId, }).OrderBy(x=>x.Created).GroupBy(x=>new {Id=x.Id, Title=x.Title}).Select(x=>x.First()).AsQueryable(); ...}

How to totally lock a row in Entity Framework

EF doesn't have built-in locking mechanism, you probably would need to use raw query like...using (var scope = new TransactionScope(...)) { using (var context = new YourContext(...)) { var wallet = context.ExecuteStoreQuery<UserWallet>("SELECT UserId, WalletId, Balance FROM UserWallets WITH (UPDLOCK) WHERE ..."); ...

Entity Framework read queries locking all database

If you're downloading a lot of data synchronously it will make the UI freeze up on you. Consider doing this asynchronously. What are you using client side, anyway? ...I'm assuming you're generating an excel file from data in the database and it's just a matter of it being enough data that it takes ~5 seconds to create the file and send it to the u...

Async/Await and Entity Framework SQL Procedure UI Thread Locking

I got it working. Since I'm using a Procedure I couldn't use .ConfigureAwait(false)...I did incorporate the suggestions from the comments to make the reader async. This is a small query so it doesn't benefit greatly from this, however I have other queries that will and I'm going to make this a part of standard operations going forward for all queri...