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hasanbaysal
Example-Db-Script
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--Transaction Yapısı aslında default olarak Sql İçerisinde var
--default olarak her sorgu commit özelliğine sahiptir
-- commit tran =>işlemi başarı ile sona erdir
-- rollback tran => işlemi geriye al
--Transcationlar genelde Stored Procedures gibi yapılarla birlikte kullanılır. Bir dizi sql kodunuz var sp içinde
-- işlem başladı ama bazı şeyler ters gitti işlemem tamamlanamadı ve yarıda kesildi
-- ama siz bu sorunlu işleme gelene kadar 3 tabloda değişiklik yaptınız onlar işlendi bile çoktan tablolara
-- o zaman bu işlemi en başa sanki hiç olmamış gibi geri almak istiyorsanız işte transaction tam bunun için var
--Aşağıdaki örnek koda bakın personeller tablosundan bir silme işlemi yapıyorum ama sildiğim kişi sayısı
-- 1'den fazla ise bu işlemi geri alıyorum
-- NOT : @@rowcount bize son yapılan sorgudan kaç satırın etkilendiğini gösterir
use Northwind
go
begin tran --transaction başlatıyorum
declare @i int
delete from Personeller where PersonelID>1
set @i = @@ROWCOUNT
if @i =1
begin
print 'kayıt silindi'
commit --işlem istediğim gibi ise commit
end
else
begin
print 'kayıt silinemedi'
rollback --işlem istemedğim gibiyse rollback yapıyorum bu noktada
end
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