如何使实体框架在一次数据库访问中插入条目

Question

I have an one-to-many relationship defined with EntityFramework code-first. Something like: BigEntity that contains a SmallEntitiesList (list o of SmallEntity).

Whenver I update the SmallEntities list of that object, and I perform a dbContext.SaveChanges() , I can see in the SQL logger that Entity Framework inserts those items by making a roundtrip to database for each one .

So the log is looking something like this:

Each of these inserts looks like this:

DECLARE
  updatedRowid ROWID;
BEGIN


INSERT INTO SOME_TABLE(...)
VALUES (...)

RETURNING ROWID INTO updatedRowid;
OPEN '' /* @outParameter */ FOR SELECT
     SOME_TABLE 
FROM SOME_TABLE 
WHERE ROWID = updatedRowid;
END;

Is there a way to make entity framework to behave differently and make these inserts making a trip to database for each one?

UPDATE: Already tried BulkInsert (there is no support for Oracle DevArt, which is what I am using).

Answer 1

if you are using EF(version 6) 6.1.3 then you can achieve this with EntityFramework.BulkInsert extension provided . It will insert the list of object in single call which will improve application performance very much . Form more information check this out .

https://efbulkinsert.codeplex.com/

Answer 2

foreach(var item in ListItems)
{
  context.Entry(item).State = System.Data.EntityState.Added;
  context.Add(item);
}

context.SaveChanges();

OR

foreach (var item in objectList)
{
  context.YourObject.AddObject(item );
}

context.SaveChanges(SaveOptions.None);

OR

Research - BulkInsert();

Answer 3

Disclaimer : I'm the owner of Entity Framework Extensions

This library support all major providor including:

• Oracle DevArt
• Oracle DataAccess
• Oracle DataAccessManaged

This library allows you to perform all bulk operations you need for your scenarios:

• Bulk SaveChanges
• Bulk Insert
• Bulk Delete
• Bulk Update
• Bulk Merge

Example

// Easy to use
context.BulkSaveChanges();

// Easy to customize
context.BulkSaveChanges(bulk => bulk.BatchSize = 100);

// Perform Bulk Operations
context.BulkDelete(customers);
context.BulkInsert(customers);
context.BulkUpdate(customers);

// Customize Primary Key
context.BulkMerge(customers, operation => {
   operation.ColumnPrimaryKeyExpression = 
        customer => customer.Code;
});