Simple database. Foreign keys insertion

Question

I have 2 categories A and B with the following columns:

Category A

_id | name

Category B

_id | tableA_id |name

Item List

_id | name | tableB_id

tableA_id and tableB_id are foreign keys and _id columns are primary keys.

Category B is a sub-category of A.

name columns are unique (there will be just 1 category in each table)

I want to insert 5 items each with their category A and B.

Item 1:

name: item1
category A: Movie
Category B: Action

Item 2:

name: item2
category A: Movie
Category B: Drama

Item 3:

name: item3
category A: Movie
Category B: Comedy

Item 4:

name: item4
category A: Music
Category B: Pop

Item 5:

name: item5
category A: Music
Category B: Rock

How can I populate the foreign keys without querying the ids of their correspondent primary?

Or am I missing an important part of DB design?

Answer 1

If your database design is 'correct', to prevent corruption you will not be able to insert child records without their parent keys.

In order to get the parent key, without doing a re-query, read this excellent post:

http://www.mikesdotnetting.com/Article/54/Getting-the-identity-of-the-most-recently-added-record

Answer 2

How can I populate the foreign keys without querying the ids of their correspondent primary?

If I understand your question correctly, you cannot populate the foreign keys when inserting new record into table List without querying the ids of Rock, that is without

select _id,  tableA_id
from Category_B
where name = 'Rock'

Answer 3

First populate CATEGORY_A and CATEGORY_B.

Then insert into ITEM_LIST knowing CATEGORY_B.ID.