Lock 'Childreen' Table

Question

Hi!
I'm new in SQL and I´ve been the problem bellow:
I lock a record in one foreign table and automaticaly SQL lock the record that matches on primary table.
But this occours just in some primaries tables and not in all. I need that just the table that are of SELECT are lock. How can I do this?
Example:
** At open of the invoice:
SET ISOLATION LEVEL READ UNCOMMITTED
BEGIN TRANSACTION
SELECT * FROM INVOICE WITH (ROWLOCK UPLOCK) WHERE ( ID = 15 )
******* at the end of invoice:
INSERT INTO INVOICE ........
COMMIT TRANSACTION
END
******* The relationship are:
INVOICE <>> ITENS_INVOICE 
ITENS_INVOICE <>> PRODUCTS
CUSTOMER <>> INVOICE
VENDORS <>> INVOICE
Just the INVOICE and PRODUCTS record´s involved in Transaction are lock. ( The CUSTOMER and VENDORS are not locked for example )
But I need that just INVOICE record be locked.
Thank´s for all and sorry my English.
Igor Sane
São Paulo - Brazil

Answer 1

You can not lock SELECTs
If you use 
CREATE TABLE t1 (c int)
BEGIN TRAN
SELECT  top 0 * FROM t1 WITH (TABLOCK, REPEATABLEREAD) 
INSERT INTO t1 ....
In another Window users will be blocked to insert a new row into a t1 table
Best Regards,Uri Dimant SQL Server MVP,
http://sqlblog.com/blogs/uri_dimant/
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