Possible to get PrimayKey IDs back after a SQL BulkCopy?

c# sql sqlbulkcopy sql-server-2005

Question

I am using C# and using SqlBulkCopy. I have a problem though. I need to do a mass insert into one table then another mass insert into another table.

These 2 have a PK/FK relationship.

Table A
Field1 -PK auto incrementing (easy to do SqlBulkCopy as straight forward)

Table B
Field1 -PK/FK - This field makes the relationship and is also the PK of this table. It is not auto incrementing and needs to have the same id as to the row in Table A.

So these tables have a one to one relationship but I am unsure how to get back all those PK Id that the mass insert made since I need them for Table B.

Edit

Could I do something like this?

SELECT * 
FROM Product
WHERE NOT EXISTS (SELECT * FROM ProductReview WHERE Product.ProductId = ProductReview.ProductId AND Product.Qty = NULL AND Product.ProductName != 'Ipad')

This should find all the rows that where just inserted with the sql bulk copy. I am not sure how to take the results from this then do a mass insert with them from a SP.

The only problem I can see with this is that if a user is doing the records one at a time and a this statement runs at the same time it could try to insert a row twice into the "Product Review Table".

So say I got like one user using the manual way and another user doing the mass way at about the same time.

manual way. 1. User submits data 2. Linq to sql Product object is made and filled with the data and submited. 3. this object now contains the ProductId 4. Another linq to sql object is made for the Product review table and is inserted(Product Id from step 3 is sent along).

Mass way. 1. User grabs data from a user sharing the data. 2. All Product rows from the sharing user are grabbed. 3. SQL Bulk copy insert on Product rows happens. 4. My SP selects all rows that only exist in the Product table and meets some other conditions 5. Mass insert happens with those rows.

So what happens if step 3(manual way) is happening at the same time as step 4(mass way). I think it would try to insert the same row twice causing a primary constraint execption.

Accepted Answer

In that scenario, I would use SqlBulkCopy to insert into a staging table (i.e. one that looks like the data I want to import, but isn't part of the main transactional tables), and then at the DB to a INSERT/SELECT to move the data into the first real table.

Now I have two choices depending on the server version; I could do a second INSERT/SELECT to the second real table, or I could use the INSERT/OUTPUT clause to do the second insert , using the identity rows from the table.

For example:

     -- dummy schema
     CREATE TABLE TMP (data varchar(max))
     CREATE TABLE [Table1] (id int not null identity(1,1), data varchar(max))
     CREATE TABLE [Table2] (id int not null identity(1,1), id1 int not null, data varchar(max))

     -- imagine this is the SqlBulkCopy
     INSERT TMP VALUES('abc')
     INSERT TMP VALUES('def')
     INSERT TMP VALUES('ghi')

     -- now push into the real tables
     INSERT [Table1]
     OUTPUT INSERTED.id, INSERTED.data INTO [Table2](id1,data)
     SELECT data FROM TMP

Expert Answer

Disclaimer: I'm the owner of the project C# Bulk Operations

The library overcome SqlBulkCopy limitations and add flexible features like output inserted identity value.

Behind the code, it does exactly like the accepted answer but way easier to use.

var bulk = new BulkOperation(connection);

// Output Identity
bulk.ColumnMappings.Add("ProductID", ColumnMappingDirectionType.Output);
// ... Column Mappings...

bulk.BulkInsert(dt);


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