Entity Framework 6 - Knowledge Base (KB)
45 results in tag: transactions
Entity Framework: Is it possible to use transactions and rollbacks?
Issue: (With Sql 2005)...How can I query the database while the transaction is up? (Since it locks the table)...How can cause a transaction to rollback and then close itself to allow the table to be queried?...So I found this much:...[TestMethod] public v...
asked by Programmin Tool
Why is TransactionScope not compatible with Entity Framework?
See the code below. If I initialize more than one entity context, then I get the following exception on the ...2nd set of code only.... If I comment out the second set it works....{"The underlying provider failed on Open."}...Inner: {"Communication with...
asked by NotDan
Using Transactions or AcceptAllChanges() and SaveChanges(false)?
I have been investigating transactions and it appears that they take care of themselves in EF as long as I pass ...false... to ...SaveChanges()... and then call ...AcceptAllChanges()... if there are no errors:...SaveChanges(false); // ... AcceptAllChanges...
asked by mark smith
How do I utilize Entity Framework transactions?
When you have code like this:...Something something = new Something(); BlahEntities b = new BlahEntities() b.AddToSomethingSet(something); b.SaveChanges(); ...how do run that addition inside a transaction?
asked by pupeno
In Entity Framework, how do you rollback a transaction?
string[] usersToAdd = new string[] { "asd", "asdert", "gasdff6" }; using (Entities context = new Entities()) { foreach (string user in usersToAdd) { context.AddToUsers(new User { Name = user }); } try { context.SaveChan...
asked by Shimmy
Because there are other threads active in the session, a new transaction is not authorized. SqlException from Entity Framework
I am currently getting this error:...System.Data.SqlClient.SqlException: New transaction is not allowed because there are other threads running in the session....while running this code:...public class ProductManager : IProductManager { #region Declar...
asked by Keith Barrows
Without MSDTC, how can I run two Entity Framework Contexts within TransactionScope?
This problem is not readily reproducible in a simple example here but was wondering if anyone has any experience and tips, here is the issue:...using ...Entity Framework...have many points in application where (1) data is written to some ...entity... tabl...
asked by Edward Tanguay
How can I prevent Entity Framework from locking the database?
Possible Duplicate:...Entity Framework with NOLOCK...I'm using EF4 and .Net 4 to load some XML from a file into a database....I have a class the wraps around the ObjectContext and has methods that add the marshalled objects from the XML file to the variou...
asked by James
When I use oeSaveChanges() in Entity Framework, what is the default transaction isolation level?
What is the default transaction isolation level in Entity Framework when I issue “SaveChanges()� I can not find it anywhere. Shall it be "Serializable"?
asked by BigMountainTiger
Bulk inserts in EntityFramework 4.0 result in transaction abort.
We are receiving a file from a client (Silverlight) via WCF and on the serverside I parse this file. Each line in the file is transformed into an object and stored into the database. if the file is very large (10000 entries and more), I get the following ...
asked by HarryK
Avoiding the if-exists-update-else-insert race problem in Entity Framework
I've been reading other questions on how to implement if-exists-insert-else-update semantics in EF, but either I'm not understanding how the answers work, or they are in fact not addressing the issue. A common solution offered is to wrap the work in a tr...
asked by Mike Chamberlain
SaveChanges() Calls from EF Competitors
I am building a batch processing system. Batches of ...Units... come in quantities from 20-1000. Each ...Unit... is essentially a hierarchy of models (one main model and many child models). My task involves saving each model hierarchy to a database as ...
asked by Jeff Swensen
The underlying provider failed on Commit, throwing a System.Data.EntityException.
Using Entity Framework, I received a number of the following exceptions last night in one of my applications:...System.Data.EntityException: The underlying provider failed on Commit. ---> System.Data.SqlClient.SqlException: Timeout expired. The timeout ...
asked by Randy
Unit Of Work Pattern with Database Transactions
I've been tried to get my head around this for a couple of days and there are lots of tutorials around unit of work and around TransactionScope but I can't find anything that talks about the two together. Any help much appreciated!...I am using Entity Fra...
asked by Matt Austin
Transaction scope timeout on 10 minutes
I have a long running ...TransactionScope... in C#. I told the scope that it should have a long timespan, but still I get a timeout. What could cause this?...TransactionOptions transactionOptions = new TransactionOptions(); transactionOptions.IsolationLev...
asked by Patrick
Entity Framework and transaction isolation level
I'm using Entity Framework 4.0. Now I need to restrict access to a table while I'm reading from it or writing to it. Probably that's about transaction isolation level....How do I do that?...Update...here is what I have...using (var db = new MyDb()) { ...
asked by Alan Coromano
SaveChanges has custom atomic UPDATE instructions ()
For various reasons I need to be able to do several custom SQL ...UPDATE... commands when I call ...SaveChanges... on a ...DbContext.... I want this to happen atomically so either both the regular ...SaveChanges... and the SQL succeeds, or neither does...
asked by JulianR
Transactions commit and rollback with Entity Framework, Mysql and LINQ to SQL in C#
My problem is that the ...transaction... is not working properly it should not save the data for one table if an exception occurs during the ...trascation...When all the table is correct then only save data....Consider the following:...databaseEntites obj...
asked by user1045389
Entity Framework - "New transaction is not allowed because there are other threads running in the session"
I am getting the following error trying to save changes in entity framework -...System.Data.SqlClient.SqlException: New transaction is not allowed because there are other threads running in the session....I have seen various answers to this problem, but I...
asked by user1948635
How do you configure the Transaction time out in Entity Framework 6 DbContext.Database.BeginTransaction?
Using code like...using (var tran = Ctxt.Database.BeginTransaction()) { ...How can I set a value for the transaction timeout ?
asked by John Waters
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