Entity Framework. Delete all rows in table

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How I can quickly remove all rows in table using Entity Framework?

I am currently using:

var rows = from o in dataDb.Table
           select o;
foreach (var row in rows)
{
    dataDb.Table.Remove(row);
}
dataDb.SaveChanges();

However, it takes a long time to execute.

Are there any alternatives?

For those that are googling this and ended up here like me, this is how you currently do it in EF5 and EF6:

context.Database.ExecuteSqlCommand("TRUNCATE TABLE [TableName]");

Assuming context is a System.Data.Entity.DbContext

Delete all entities in Entity Framework, Foreach(table => { //code that deletes the actual tables records. } One thing more: If you want to delete all tables and not just clear them, then replace the line: I personally checked this answer on Entity Framework 6 with code-first migration. A user can hold multiple license and those appear as different rows in the UserLicense table. Now I need to remove a particular license from the license table. I do not want to delete it outright, so I mark IsActive = false. However I do want to delete rows from the UserLicense table for that license Id. I am using Entity Framework.

Entity Framework. Delete all rows in table, For those that are googling this and ended up here like me, this is how you currently do it in EF5 and EF6: context.Database. Re: delete all the records from one table entity framework Apr 18, 2012 03:44 AM | amitpatel.it | LINK In this case simple thing is create store procedure or directly run sql query by entity frameowrk's dbcontext class. see below code

Using SQL's TRUNCATE TABLE command will be the fastest as it operates on the table and not on individual rows.

dataDb.ExecuteStoreCommand("TRUNCATE TABLE [Table]");

Assuming dataDb is a DbContext (not an ObjectContext), you can wrap it and use the method like this:

var objCtx = ((System.Data.Entity.Infrastructure.IObjectContextAdapter)dataDb).ObjectContext;
objCtx.ExecuteStoreCommand("TRUNCATE TABLE [Table]");

Entity Framework. Delete all rows in table, In Entity_Framework5 and Entity_Framework6 you can delete all rows in table this way: Assuming context is a System.Data.Entity.DbContext. ClearDatabase method goes over the list of tables and clean them. if FK constraint is found then catch the exception and move on to the next table. at the end all tables will be deleted. Moreover, if you don't mind to loose all the FK constraints, you can disable all of them by the line:

var all = from c in dataDb.Table select c;
dataDb.Table.RemoveRange(all);
dataDb.SaveChanges();

Deleting data via the DbContext, The approach that you adopt to deleting entities via the DbContext depends on can delete the principal and let the database take care of the dependent rows. EF Core API builds and executes the DELETE statement in the database for the entities whose EntityState is set as ‘Deleted’. The method DbContext.Remove() is used for deleting entity. Consider the following code which deletes Department with Id ‘3’.

using (var context = new DataDb())
{
     var ctx = ((System.Data.Entity.Infrastructure.IObjectContextAdapter)context).ObjectContext;
     ctx.ExecuteStoreCommand("DELETE FROM [TableName] WHERE Name= {0}", Name);
}

or

using (var context = new DataDb())
{
     context.Database.ExecuteSqlCommand("TRUNCATE TABLE [TableName]");
}

delete-from-query | Entity Framework delete-from-query, In other words, even if you put a filter, all rows tables could be potentially deleted if the filter is made on the client-side. We always recommend to disable the client​  In other words, .Remove removes only one object. Entity Framework Core does NOT have .RemoveRange, so I have no idea how to perform this operation. In order to preserve maximum compatibility with the various database providers, I would prefer NOT to call context.Database.ExecuteSqlCommand

[SOLVED], because I get an error "InvalidOperationException: Collection was modified; enumeration operation may not execute" after the first object. Entity Framework has one beautiful thing for it, like : var users = context.Users; This will select all rows in Table User, then you can use your .ToList() etc.

Execute SQL command in Entity Framework Core 2.0 to delete all , This will perform over any of delete row-per-row from table methods. context.​ExecuteStoreCommand("TRUNCATE TABLE [" + tableName + "]");. Deleting in a connected scenario is very straight forward. Query the Department entity from the database. Call Remove method and pass the Department object to delete. The Change tracking in Entity Framework marks the entity as Deleted. Finally, SaveChanges will remove the Department from the database using the Delete Query

[Solved] How to Truncate a Table using Entity Framework in C# , //Truncate Table to delete all old records. entities.Database.​ExecuteSqlCommand( "TRUNCATE TABLE [Customers]" );. }  In the following example, the entity to be deleted is obtained by the context, so the context begins tracking it immediately. The DbContext.Remove method results in the entity's EntityState being set to Deleted. context.Remove(context.Authors.Single(a => a.AuthorId == 1)); context.SaveChanges();

Comments
  • Reading the answers I wonder why none of these TRUNCATE adepts worry about foreign key constraints.
  • I'm kind of amazed by how the answers here just take for granted that everyone is using Microsoft SQL Server, even though support for other databases in Entity Framework goes back as far as I can find information about and certainly predates this question by several years. Tip: if an answer quotes table names in SQL statements with square brackets (like: [TableName]), it isn't portable.
  • FYI, in order to use TRUNCATE the user must have ALTER permission on the table. (stackoverflow.com/questions/4735038/…)
  • @Alex Just wasted a ton of time on the error "Cannot find the object MyTable because it does not exist or you do not have permissions." for that exact reason - ALTER permissions are rarely granted to EF apps, and the error message really sends you on a wild goose chase.
  • I had issues since my table was part of a foreign key relationship, even though it was the leaf table in that relationship. I wound up using context.Database.ExecuteSqlCommand("DELETE FROM [Interests]"); instead
  • Note that while the [ escapes here are specific to SQL Server, the TRUNCATE command is not - it's part of ANSI SQL and so will work in most SQL dialects (though not SQLite).
  • Great answer, speeded up my delete all rows code by a factor of 10! Note that I had to rename the Clear() static extension method to something like ClearDbSet() since I already had another Clear() static extension method defined elsewhere in my project.
  • @dodgy_coder renaming isn´t necessary for reason you gave, since the extension method is for DbSet, IDbSet s and not IEnumerable, IList, ICollection, ICache or any other interface that "Clear" would be required. the preference for extension method are the type on which the are defined. but if that reads clearer to you and doesn´t sound redundant, Great!. i´,m glad it helps perfomance wise! Cheers!
  • i'm glad you stated for small tables only. i hope people get the importance of your explanation. because this way is syntactic sugar, the proper way is the way Ron Sijm suggested. because you don't load the data before removing it. cheers though for showing and explaining this way of doing it.
  • This does not reset the identity key. So if you clear 10 records, the next one will still be 11.
  • If you get a permissions error when you try this, just change TRUNCATE TABLE to DELETE FROM