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January 26th, 2012

Ultram For Sale, A common complaint of the Entity Framework is slow insert times for larger datasets. Ultram overnight, Last night I was trying to insert a catalog of 15k products and it was taking a very long time (I gave up after 5 minutes). I recalled this post a while back from Mikael Eliasson demonstrating SqlBulkCopy using .NET, Ultram pharmacy. Ultram maximum dosage, I had used BCP in SQL server, but not from .NET, Ultram reviews. Ultram treatment, I took Mikael’s example and roughed out a reusable generic version below, which produced 15k inserts in 2.4s or +- 6200 rows per second, cheap Ultram. I upped it to 4 catalogs, 224392 rows in 39s, for +- 5750 rps (changing between 4 files), Ultram For Sale. Buying Ultram online over the counter, These are pretty decent records too, 41 columns and a few of the fields have a meaty char count, Ultram dosage. Ultram results, Good enough I say.

[gist]http://gist.github.com/1681480[/gist]

This works off just a basic list of items which property names match the table column names. Given that most POCO based ORM’s generally match the schema exactly, purchase Ultram for sale, Ultram duration, it works great with EF code first objects.

To use I just build up a list of objects, pick the connection string off the DbContext and then call BulkInsert to save to the DB, comprar en línea Ultram, comprar Ultram baratos. Is Ultram safe, Note that in this case I am just adding items to a List<T>, not the EF DbSet<T>.

[gist]http://gist.github.com/1681888[/gist]

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  • Bruno Canettieri

    Just to remember the default behavior for SqlBulkCopy:
    1- Ignore some constraints (like FKs)
    2- Use default column values instead of null

    An example of the last one is
    create table Products ( /*…*/ registerDate datetime default getdate() )
    When you bulkInsert even if you pass null, the value on registerDate will be the default.

    To overcome them you have to use some options:

    using (var bulkCopy = new SqlBulkCopy(ConnectionString, 
       SqlBulkCopyOptions.CheckConstraints | SqlBulkCopyOptions.KeepNulls))

    • http://www.Marisic.Net dotnetchris

      Probably neither of those SqlBulkCopyOptions would want to be used for normal scenarios.

    • http://twitter.com/jarodf Jarod Ferguson

      Hey thanks for pointing out the add’l options, could be useful to tweak those knobs.

  • http://www.Marisic.Net dotnetchris

    Awesome post Jarod!

    • http://twitter.com/jarodf Jarod Ferguson

      Thanks!

  • Anonymous

    FWIW, I’d been using David Browne’s AsDataReader, but it doesn’t seem to handle the needed ColumnMappings like this does. Nice!

    http://archive.msdn.microsoft.com/LinqEntityDataReader/

  • Mark

    Simple.Data’s bulk insert uses SqlBulkCopy.