如何在Entity Framework中批量更新记录? [英] How to Bulk Update records in Entity Framework?

问题描述

我正在尝试使用Entity Framework批量更新记录.我尝试了Entity Framework.Extensions Update方法.

I am trying to bulk update records using Entity Framework. I have tried Entity Framework.Extensions Update method.

Update方法能够批量更新具有相同更新值集的一组记录.

The Update method is able to bulk update for a set of records with same set of update values.

示例:

           Id -  Quantity
Record 1 - A  -  10
Record 2 - B  -  20
Record 3 - C  -  30

我们可以通过简单的调用

We can bulk update all the above records by simple calling

Records.Update(new => Record { Quantity = 100 });

如何使用Entityframework.Extensions或任何其他方式批量更新具有不同数量的每条记录，从而更快地完成批量更新?

How can I bulk update each record with different quantity using Entityframework.Extensions or in any other approach, which completes the bulk update faster?

推荐答案

如果您不想使用SQL语句，则可以使用Attach方法来更新实体，而不必先加载它:

If you don't want to use an SQL statement, you can use the Attach method in order to update an entity without having to load it first :

using (myDbEntities db = new myDbEntities())
{
    try
    {
      //disable detection of changes to improve performance
      db.Configuration.AutoDetectChangesEnabled = false;

      //for all the entities to update...
      MyObjectEntity entityToUpdate = new MyObjectEntity() {Id=123, Quantity=100};
      db.MyObjectEntity.Attach(entityToUpdate);

      //then perform the update
      db.SaveChanges();
    }
    finally
    {
      //re-enable detection of changes
      db.Configuration.AutoDetectChangesEnabled = true;
    }
}

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