Radyo çekimlerinizin hepsini dinledim (beşinide) bi kaç gün önce csharpnedir de rastlamıştım. Ondan önce haberim olmadıydı. Ben de hepsini indirim yolda gidip gelirken iş yerinde çalışırken dinledim. Çalışmanızı (tüm ekip için diyorum) dinleyen ve çok beğenen biri olarak devamını diliyorum. İyi çalışmalar...

ORM kullanmanin pek de iyi olmadigini soylemistiniz ve genel gorus ORMin goturusunun getirisinden cok olmasiydi.

Argumanlardan biri (hafizamdan soyluyorum, dinleyeli birkac aydan fazla oldu sanirim)

Performans Kaybi: Katilmiyorum. Arka tarafta reflection calisiyor olmasi (ki bu reflection dynamic methodlarla yapilan 1-1 performansa yakin bir reflection) onun yavas olmasi anlamina gelmez. Zira bir kod icinde 100000 nesne ayni anda aliniyorsa o is ya raporlamadir ya da hatali tasarimdir.
SQL sorgularinda performans sorununuun buyuk bir cogunlugu veritabanina ayri ayri gonderilen sorgular sebebiyle olmaktadir, NHibernate gibi ORMler bu sorgularin tek bir hamlede gonderilmesini saglayarak performans iyilestirmesi saglarlar(insert, update, delete icin vs). Ayrica lazy loading dedigimiz yapi da performans konusunda oldukca iyi bir iyilestirmedir. Ayrica spesifik olarak konusacak olursam NHibernate cesitli Caching providerlerla (bkz: Memcached, Velocity, etc) transparan bir sekilde iletisime girer. bu da zahmet gostermeksizin inanilmaz performans kazanci demek. Ayrica NH icinde barindirdigi sharding destegi(horizontal partitioning) ile cok iyi performans iyilestirmeleri saglar.
Ayrica bir uygulamada performanstan cok uygulamanin ynetilebilir olmasi onemlidir. Kaldi ki konustugumuz performans kaybi genelde yok, aksine performans getirileri var. Ayrica ayni NH sessionu icinde iki defa ayni nesnenin cagrilmasi nesnenin veritabanindan bir kere getirilmesi demektir ki bu elle yazilan DALlarda yapilmayan bir seydir

bir digeri ise "CreateSqlQuery". ORMi tamamen yanlis anladiginizi sanmami saglayan neden(kimin soyledigini hatiralmiyorum fakat bu argumanin diger konusmacilar tarafindan da desteklendigini belirtmek isterim). Bu ORMle ilgili degil spesifik bir frameworkle alakalidir. ORMin amaci SQLin tum sagladiklarini saglamak degildir, kaldi ki destekledikleri bir cok uygulamanin ihtiyaclarinin cok buyuk bir kismini saglayacak niteliktedir. Ayrica yakin zamanda NH icin fully-blown bir AST parser getirilecek olmasi bu argumanininizn da yavas yavas curumesi demek. Zira calismayan durumlarda icine kendi epxssion parserlarinizi gomebileceksiniz demek. ORM sorgulari domain modelinizi sql den sorgulayabilmeniz demek. Bu noktanin bir alay konusu yapilmasi ise gercekten uzucu.

Su listeye bakmanizi gercekten oneririm:

http://ayende.com/Blog/archive/2006/05/12/25ReasonsNotToWriteYourOwnObjectRelationalMapper.aspx

NHin birkac "buyuk oldugu soylenen" uygulamada basarisiz sekilde kullanilmasi, ORM in ve NHin kotu oldugu anlamina gelmez. Kaldi ki ebay gibi bir sistem bile Hibernate kullaniyorsa buyuk uygulama kavramini yeniden sorgulamak lazim. Ayrica yazdigi yazilimin kalitesini cesitli acik kodlu projelerde gordugumuz insanlar bu gibi teknolojileri yuceltiyorsa ben burada kapali kodlu yazilim yapan insanlarin gorusunu sorgularim. Yazilim dunyasi elbette ki "tek iyi"nin oldugu bir dunya degil fakat gozu kapali sekilde kotulenmesi hic hos degil.

Good design, who make it?.
I am from Qatar and learning to write in English, give please true I wrote the following sentence: "Aqueous flare was measured with a laser."

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