Question
I've seen a number of "Bulk Insert in EF" questions however all of these deal with a usecase where a user is trying to insert a large array of items.
I've a situation where I have a new Parent entity with ~1500 new related entities attached to it. Both the parent and the child entities are mapped to their own tables in EF.
At the moment I'm using something like:
//p is already created and contains all the new child items
public void SaveBigThing(Parent p){
if(p.Id == 0){
// we've got a new object to add
db.BigObjects.Add(p);
}
db.SaveChanges();
}
Entity Framework at the moment creates an individual insert statement for each and every child item. Which takes 50 seconds or so. I want to be able to use db.ChildEntity.AddRange(items) But I'm unsure if there's a better way than to use 2 separate operations. First create the parent to get it's Id then a AddRange for all the child items?
Popular Answer
IMHO You dont need to add parent first in-order to insert child items. You could do that in one shot.
You could try this in EF 5 AddRange is only available in EF 6 or higher.
This will not insert the item in bulk it will generate the query and insert at one shot
public bool InsertParent(Parent parentObject)
{
//Assuming this is the parent table
db.BigObjects.Add(parentObject);
InsertChilds(parentObject); //Insert childs
db.SaveChanges();
}
public bool InsertChilds(Parent parentObject)
{
// This will save more time .
DataContext).Configuration.AutoDetectChangesEnabled = false;
foreach(var child in parentObject.Childs)
{
//This will set the child parent relation
child.Parent = childParent;
db.ChildEntity.Add(child);
}
DataContext).Configuration.AutoDetectChangesEnabled = true;
}
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