{"id":45390,"date":"2026-10-26T21:00:33","date_gmt":"2026-10-26T18:00:33","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/muhendislik-ekiplerinde-veritabani-imleclerinin-cursor-etkin-kullanimi\/"},"modified":"2026-10-26T21:00:56","modified_gmt":"2026-10-26T18:00:56","slug":"muhendislik-ekiplerinde-veritabani-imleclerinin-cursor-etkin-kullanimi","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/muhendislik-ekiplerinde-veritabani-imleclerinin-cursor-etkin-kullanimi\/","title":{"rendered":"M\u00fchendislik Ekiplerinde Veritaban\u0131 \u0130mle\u00e7lerinin (Cursor) Etkin Kullan\u0131m\u0131"},"content":{"rendered":"<h2>M\u00fchendislik Ekiplerinde Veritaban\u0131 \u0130mle\u00e7lerinin (Cursor) Etkin Kullan\u0131m\u0131<\/h2>\n<p>M\u00fchendislik projelerinde veri y\u00f6netimi, kritik s\u00fcre\u00e7lerin temelini olu\u015fturur. Peki, b\u00fcy\u00fck veri k\u00fcmeleriyle \u00e7al\u0131\u015f\u0131rken veritaban\u0131 imle\u00e7leri (cursor) nas\u0131l devreye girer ve bu karma\u015f\u0131k yap\u0131lar\u0131 nas\u0131l daha verimli hale getirir? Bu makalede, imle\u00e7lerin ne oldu\u011funu, ne zaman kullan\u0131lmas\u0131 gerekti\u011fini ve reg\u00fclatif m\u00fchendislik ekiplerinin bu ara\u00e7lar\u0131 nas\u0131l stratejik olarak kullanabilece\u011fini ad\u0131m ad\u0131m inceleyece\u011fiz. Veri tabanlar\u0131nda gezinmenin inceliklerini \u00f6\u011frenerek projelerinizde h\u0131z ve do\u011fruluk kazan\u0131n.<\/p>\n<h2>Veritaban\u0131 \u0130mle\u00e7leri (Cursor) Nedir ve Neden \u00d6nemlidir?<\/h2>\n<p>Teknik projelerde, \u00f6zellikle de m\u00fchendislik alan\u0131nda, b\u00fcy\u00fck miktarda veriyi i\u015flemek ve analiz etmek ka\u00e7\u0131n\u0131lmazd\u0131r. Bu veriler genellikle ili\u015fkisel veritabanlar\u0131nda (relational databases) saklan\u0131r. Veritaban\u0131 y\u00f6netim sistemleri (DBMS), bu verileri sorgulamak ve almak i\u00e7in \u00e7e\u015fitli mekanizmalar sunar. \u0130\u015fte bu noktada, veritaban\u0131 imle\u00e7leri (cursor) devreye girer. Basit\u00e7e ifade etmek gerekirse, bir imle\u00e7, bir veritaban\u0131 sorgusunun sonucunda elde edilen sat\u0131rlar k\u00fcmesi \u00fczerinde gezinmemizi sa\u011flayan bir kontrol mekanizmas\u0131d\u0131r. Bir imle\u00e7, bir sorgu \u00e7al\u0131\u015ft\u0131rd\u0131\u011f\u0131n\u0131zda size tek bir sat\u0131r veya belirli say\u0131da sat\u0131r getirir, b\u00f6ylece t\u00fcm veri k\u00fcmesini belle\u011finize y\u00fcklemek zorunda kalmazs\u0131n\u0131z. Bu, \u00f6zellikle b\u00fcy\u00fck veri k\u00fcmeleriyle \u00e7al\u0131\u015f\u0131rken bellek kullan\u0131m\u0131n\u0131 optimize etmek ve performans\u0131 art\u0131rmak a\u00e7\u0131s\u0131ndan kritik \u00f6neme sahiptir. Reg\u00fclatif m\u00fchendislik ekipleri i\u00e7in bu, hassas verileri y\u00f6netirken hem uyumluluk gereksinimlerini kar\u015f\u0131lama hem de operasyonel verimlili\u011fi sa\u011flama anlam\u0131na gelir.<\/p>\n<p>Geleneksel olarak, bir SQL sorgusu \u00e7al\u0131\u015ft\u0131rd\u0131\u011f\u0131n\u0131zda, sonu\u00e7 k\u00fcmesinin tamam\u0131 genellikle istemci uygulamas\u0131na (client application) bir seferde getirilir. Bu, k\u00fc\u00e7\u00fck veri k\u00fcmeleri i\u00e7in sorun olmayabilir, ancak milyonlarca sat\u0131r i\u00e7eren bir tabloyla u\u011fra\u015ft\u0131\u011f\u0131n\u0131zda, bu yakla\u015f\u0131m ciddi performans sorunlar\u0131na yol a\u00e7abilir. Uygulaman\u0131z\u0131n belle\u011fi h\u0131zla dolabilir, yan\u0131t s\u00fcreleri uzayabilir ve hatta sistem \u00e7\u00f6kebilir. \u0130\u015fte imle\u00e7ler burada devreye girerek bu sorunu \u00e7\u00f6zer. \u0130mle\u00e7ler, sonu\u00e7 k\u00fcmesini par\u00e7alar halinde getirmenize olanak tan\u0131r. Bir imle\u00e7 olu\u015fturdu\u011funuzda, veritaban\u0131 bu sorgunun sonu\u00e7lar\u0131n\u0131 belle\u011finde veya ge\u00e7ici bir alanda saklar ve size bu sonu\u00e7 k\u00fcmesine eri\u015fim sa\u011flayan bir i\u015faret\u00e7i (pointer) verir. Daha sonra, bu i\u015faret\u00e7iyi kullanarak sonu\u00e7 k\u00fcmesindeki sat\u0131rlar aras\u0131nda tek tek veya belirli gruplar halinde ilerleyebilirsiniz. Bu, uygulaman\u0131z\u0131n bellekte yaln\u0131zca o anda ihtiya\u00e7 duydu\u011fu veriyi tutmas\u0131n\u0131 sa\u011flar, bu da genel sistem performans\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde iyile\u015ftirir.<\/p>\n<p>Reg\u00fclatif m\u00fchendislik ba\u011flam\u0131nda, verilerin do\u011frulu\u011fu, g\u00fcvenli\u011fi ve izlenebilirli\u011fi hayati \u00f6nem ta\u015f\u0131r. \u00d6rne\u011fin, bir u\u00e7ak \u00fcretimi projesinde, her bir par\u00e7an\u0131n \u00fcretim ge\u00e7mi\u015fi, kullan\u0131lan malzemeler ve kalite kontrol sonu\u00e7lar\u0131 detayl\u0131 bir \u015fekilde kaydedilmelidir. Bu veriler genellikle karma\u015f\u0131k veritabanlar\u0131nda saklan\u0131r. Bir m\u00fchendis, belirli bir par\u00e7an\u0131n t\u00fcm ge\u00e7mi\u015fini incelemek istedi\u011finde, milyonlarca kay\u0131t aras\u0131ndan ilgili olanlar\u0131 \u00e7ekmesi gerekebilir. \u0130mle\u00e7ler, bu t\u00fcr senaryolarda m\u00fchendisin verileri ad\u0131m ad\u0131m, sat\u0131r sat\u0131r incelemesine olanak tan\u0131r. Bu, verilerin b\u00fct\u00fcnl\u00fc\u011f\u00fcn\u00fc korurken, ayn\u0131 zamanda gereksiz bellek y\u00fcklemesinden ka\u00e7\u0131narak analizin daha kontroll\u00fc ve g\u00fcvenli bir \u015fekilde yap\u0131lmas\u0131n\u0131 sa\u011flar. Ayr\u0131ca, imle\u00e7ler, belirli ko\u015fullara g\u00f6re veri \u00fczerinde g\u00fcncellemeler yaparken de kullan\u0131labilir. \u00d6rne\u011fin, belirli bir tolerans\u0131n d\u0131\u015f\u0131ndaki t\u00fcm par\u00e7alar\u0131n listesini al\u0131p, bu par\u00e7alar i\u00e7in \u00f6zel bir i\u015flem ba\u015flatmak gibi. Bu yetenekler, reg\u00fclatif s\u00fcre\u00e7lerin karma\u015f\u0131kl\u0131\u011f\u0131n\u0131 y\u00f6netmek i\u00e7in g\u00fc\u00e7l\u00fc bir ara\u00e7 seti sunar.<\/p>\n<h3>H3: \u0130mle\u00e7lerin Temel \u0130\u015fleyi\u015f Mekanizmas\u0131<\/h3>\n<p>Bir veritaban\u0131 imlecinin \u00e7al\u0131\u015fma mant\u0131\u011f\u0131n\u0131 anlamak, onu etkili bir \u015fekilde kullanman\u0131n ilk ad\u0131m\u0131d\u0131r. Temel olarak, bir imle\u00e7 olu\u015fturmak birka\u00e7 ad\u0131mdan olu\u015fur: bir sonu\u00e7 k\u00fcmesi tan\u0131mlamak, bu sonu\u00e7 k\u00fcmesi \u00fczerinde gezinmek i\u00e7in bir imle\u00e7 tan\u0131mlamak, imleci a\u00e7mak, sonu\u00e7 k\u00fcmesinden verileri getirmek (fetch) ve imleci kapatmak. Bu ad\u0131mlar, kullan\u0131lan veritaban\u0131 sistemine (\u00f6rne\u011fin, SQL Server, PostgreSQL, MySQL, Oracle) ve programlama diline (\u00f6rne\u011fin, Java, Python, C#) g\u00f6re k\u00fc\u00e7\u00fck farkl\u0131l\u0131klar g\u00f6sterebilir, ancak temel mant\u0131k ayn\u0131d\u0131r.<\/p>\n<p>\u0130lk ad\u0131m, bir SQL sorgusu yazarak istedi\u011finiz veri k\u00fcmesini tan\u0131mlamakt\u0131r. Bu sorgu, belirli tablolar\u0131 birle\u015ftirebilir, filtreler uygulayabilir ve verileri s\u0131ralayabilir. \u00d6rne\u011fin, bir otomotiv m\u00fchendisli\u011fi projesinde, belirli bir \u015fasi numaras\u0131na sahip t\u00fcm test s\u00fcr\u00fc\u015f\u00fc verilerini \u00e7ekmek isteyebilirsiniz. Sorgunuz \u015f\u00f6yle g\u00f6r\u00fcnebilir: <code>SELECT * FROM test_surusleri WHERE sasi_no = &#039;ABC123XYZ&#039;;<\/code> Bu sorgunun sonucu, tek bir sat\u0131r olabilece\u011fi gibi binlerce sat\u0131r da olabilir. \u0130mle\u00e7ler, bu sorgunun sonucunda elde edilen bu &#8220;sonu\u00e7 k\u00fcmesi&#8221; \u00fczerinde \u00e7al\u0131\u015f\u0131r.<\/p>\n<p>\u0130kinci ad\u0131m, bu sonu\u00e7 k\u00fcmesi \u00fczerinde gezinmek i\u00e7in bir imle\u00e7 tan\u0131mlamakt\u0131r. Bu, genellikle <code>DECLARE CURSOR<\/code> gibi bir komutla yap\u0131l\u0131r. Bu a\u015famada, imlecin nas\u0131l davranaca\u011f\u0131 konusunda baz\u0131 se\u00e7enekler belirleyebilirsiniz. \u00d6rne\u011fin, imlecin sadece ileriye do\u011fru mu hareket edece\u011fi (forward-only), yoksa geriye do\u011fru da hareket edebilece\u011fi (scrollable) belirtilebilir. Ayr\u0131ca, imlecin ne kadar veri getirece\u011fi (\u00f6rne\u011fin, bir seferde bir sat\u0131r veya on sat\u0131r) ve verilerin ne kadar s\u00fcreyle saklanaca\u011f\u0131 gibi parametreler de ayarlanabilir. Reg\u00fclatif m\u00fchendislikte, verilerin b\u00fct\u00fcnl\u00fc\u011f\u00fcn\u00fc sa\u011flamak i\u00e7in genellikle &#8220;sadece ileriye do\u011fru&#8221; ve &#8220;salt okunur&#8221; (read-only) imle\u00e7ler tercih edilir, \u00e7\u00fcnk\u00fc bu, verilerin yanl\u0131\u015fl\u0131kla de\u011fi\u015ftirilme riskini azalt\u0131r.<\/p>\n<p>\u00dc\u00e7\u00fcnc\u00fc ad\u0131m, imleci a\u00e7makt\u0131r. Bu, <code>OPEN CURSOR<\/code> komutuyla yap\u0131l\u0131r. \u0130mle\u00e7 a\u00e7\u0131ld\u0131\u011f\u0131nda, veritaban\u0131 arka planda sorguyu \u00e7al\u0131\u015ft\u0131r\u0131r ve sonu\u00e7 k\u00fcmesini haz\u0131rlar. D\u00f6rd\u00fcnc\u00fc ad\u0131m, sonu\u00e7 k\u00fcmesinden verileri getirmektir. Bu, <code>FETCH NEXT FROM CURSOR<\/code> gibi komutlarla yap\u0131l\u0131r. Her <code>FETCH<\/code> komutu, imlecin mevcut konumundan bir sonraki sat\u0131r\u0131 getirir ve imleci bir sonraki sat\u0131r\u0131n ba\u015f\u0131na konumland\u0131r\u0131r. Bu i\u015flem, sonu\u00e7 k\u00fcmesindeki t\u00fcm sat\u0131rlar getirilene kadar tekrarlanabilir. Be\u015finci ve son ad\u0131m ise, i\u015fimiz bitti\u011finde imleci kapatmakt\u0131r (<code>CLOSE CURSOR<\/code>). Bu, veritaban\u0131 kaynaklar\u0131n\u0131n serbest b\u0131rak\u0131lmas\u0131n\u0131 sa\u011flar. Son olarak, imleci tamamen kald\u0131rmak i\u00e7in <code>DEALLOCATE CURSOR<\/code> komutu kullan\u0131l\u0131r.<\/p>\n<p>Bu ad\u0131mlar, bir veritaban\u0131 i\u015fleminde (transaction) ger\u00e7ekle\u015ftirilir. Bu, imle\u00e7 \u00fczerinde yap\u0131lan t\u00fcm de\u011fi\u015fikliklerin (e\u011fer imle\u00e7 yaz\u0131labilir ise) tek bir i\u015flem olarak ele al\u0131nmas\u0131n\u0131 ve ya tamamen onaylanmas\u0131n\u0131 (commit) ya da tamamen geri al\u0131nmas\u0131n\u0131 (rollback) sa\u011flar. Bu, veri tutarl\u0131l\u0131\u011f\u0131n\u0131 sa\u011flamak i\u00e7in kritik \u00f6neme sahiptir, \u00f6zellikle de reg\u00fclatif ortamlarda.<\/p>\n<h2>Ne Zaman \u0130mle\u00e7 Kullanmal\u0131s\u0131n\u0131z?<\/h2>\n<p>\u0130mle\u00e7ler g\u00fc\u00e7l\u00fc ara\u00e7lar olsa da, her zaman en iyi \u00e7\u00f6z\u00fcm de\u011fillerdir. Veritaban\u0131 imle\u00e7lerinin kullan\u0131m\u0131, performans\u0131 olumsuz etkileyebilecek ek y\u00fck getirebilir. Bu nedenle, imle\u00e7leri yaln\u0131zca belirli senaryolarda kullanmak \u00f6nemlidir. Genel bir kural olarak, e\u011fer tek bir SQL sorgusuyla istedi\u011finiz sonuca ula\u015fabiliyorsan\u0131z ve sonu\u00e7 k\u00fcmesi belle\u011fe s\u0131\u011fabiliyorsa, imle\u00e7 kullanmaktan ka\u00e7\u0131nmal\u0131s\u0131n\u0131z. Ancak, a\u015fa\u011f\u0131daki durumlarda imle\u00e7ler olduk\u00e7a faydal\u0131 olabilir:<\/p>\n<h3>H3: B\u00fcy\u00fck Veri K\u00fcmeleriyle \u00c7al\u0131\u015f\u0131rken<\/h3>\n<p>Daha \u00f6nce de belirtti\u011fimiz gibi, milyonlarca sat\u0131rdan olu\u015fan bir veri k\u00fcmesiyle \u00e7al\u0131\u015f\u0131rken, t\u00fcm sonu\u00e7lar\u0131 belle\u011fe y\u00fcklemek pratik de\u011fildir. Bu durumda, imle\u00e7ler, verileri par\u00e7a par\u00e7a getirerek bellek kullan\u0131m\u0131n\u0131 optimize eder. \u00d6rne\u011fin, bir havac\u0131l\u0131k projesinde, t\u00fcm u\u00e7u\u015f kay\u0131tlar\u0131n\u0131 analiz etmek istiyorsunuz. Bu kay\u0131tlar terabaytlarca veri i\u00e7erebilir. \u0130mle\u00e7ler sayesinde, m\u00fchendisler bu kay\u0131tlar\u0131 tek seferde birka\u00e7 y\u00fcz veya bin sat\u0131r halinde alabilir, analiz edebilir ve sonra bir sonraki parti veriyi \u00e7ekebilir. Bu, uygulaman\u0131n yan\u0131t vermesini ve analizin tamamlanmas\u0131n\u0131 sa\u011flar.<\/p>\n<h3>H3: Sat\u0131r Baz\u0131nda Karma\u015f\u0131k \u0130\u015flem Gerekti\u011finde<\/h3>\n<p>Baz\u0131 durumlarda, bir sorgunun sonu\u00e7 k\u00fcmesi \u00fczerinde sat\u0131r baz\u0131nda karma\u015f\u0131k mant\u0131klar \u00e7al\u0131\u015ft\u0131rman\u0131z gerekebilir. Bu, bir sat\u0131r\u0131n i\u015flenmesinin, bir sonraki sat\u0131r\u0131n nas\u0131l getirilece\u011fini veya i\u015flenece\u011fini etkileyebilece\u011fi durumlarda ge\u00e7erlidir. \u00d6rne\u011fin, bir m\u00fchendislik sim\u00fclasyonunda, her bir veri noktas\u0131n\u0131n hesaplanmas\u0131, bir \u00f6nceki veri noktas\u0131n\u0131n sonucuna ba\u011fl\u0131 olabilir. Bu t\u00fcr durumlar i\u00e7in, imle\u00e7ler, verileri ad\u0131m ad\u0131m getirerek ve her ad\u0131mda gerekli hesaplamalar\u0131 yaparak bu karma\u015f\u0131k ba\u011f\u0131ml\u0131l\u0131klar\u0131 y\u00f6netmenize olanak tan\u0131r. Geleneksel SQL sorgular\u0131 bu t\u00fcr s\u0131ral\u0131 ve ba\u011f\u0131ml\u0131 i\u015flemleri ger\u00e7ekle\u015ftirmekte zorlanabilir.<\/p>\n<h3>H3: Veri G\u00fcncelleme veya Silme \u0130\u015flemlerinde<\/h3>\n<p>\u0130mle\u00e7ler, sadece veri getirmek i\u00e7in de\u011fil, ayn\u0131 zamanda veri \u00fczerinde i\u015flem yapmak i\u00e7in de kullan\u0131labilir. Belirli ko\u015fullara uyan sat\u0131rlar\u0131 g\u00fcncellemeyi veya silmeyi d\u00fc\u015f\u00fcnd\u00fc\u011f\u00fcn\u00fczde, imle\u00e7ler bu i\u015flemi daha kontroll\u00fc bir \u015fekilde yapman\u0131za yard\u0131mc\u0131 olabilir. \u00d6rne\u011fin, bir \u00fcretim hatt\u0131ndaki kusurlu \u00fcr\u00fcnlerin kayd\u0131n\u0131 tutan bir veritaban\u0131n\u0131z var. Belirli bir kusur t\u00fcr\u00fcne sahip t\u00fcm kay\u0131tlar\u0131 bulup, bu kay\u0131tlar\u0131 &#8220;inceleniyor&#8221; olarak i\u015faretlemek isteyebilirsiniz. Bir imle\u00e7 ile bu kay\u0131tlar\u0131 tek tek getirip, g\u00fcncelleme komutunu her bir sat\u0131r i\u00e7in uygulayabilirsiniz. Bu, toplu g\u00fcncellemelerin yanl\u0131\u015fl\u0131kla yanl\u0131\u015f verilere uygulanmas\u0131 riskini azalt\u0131r. Reg\u00fclatif m\u00fchendislikte, bu t\u00fcr hassas veri de\u011fi\u015fikliklerinin izlenebilirli\u011fi ve do\u011frulu\u011fu son derece \u00f6nemlidir.<\/p>\n<h3>H3: Veritaban\u0131 Sisteminin Desteklemedi\u011fi Fonksiyonellik<\/h3>\n<p>Bazen, kulland\u0131\u011f\u0131n\u0131z veritaban\u0131 sisteminin sundu\u011fu standart SQL fonksiyonlar\u0131, yapmak istedi\u011finiz i\u015flemi do\u011frudan desteklemeyebilir. Bu durumda, imle\u00e7ler, daha karma\u015f\u0131k i\u015flemleri programatik olarak uygulaman\u0131z i\u00e7in bir yol sunar. \u00d6rne\u011fin, belirli bir veri setini i\u015flemek i\u00e7in \u00f6zel bir algoritman\u0131z varsa ve bu algoritma sat\u0131r baz\u0131nda ilerleme gerektiriyorsa, imle\u00e7ler bu algoritmay\u0131 veritaban\u0131 \u00fczerinde \u00e7al\u0131\u015ft\u0131rman\u0131za imkan tan\u0131r.<\/p>\n<h2>Uygulamal\u0131 K\u0131s\u0131m: \u0130mle\u00e7 Kullan\u0131m\u0131na \u00d6rnekler<\/h2>\n<p>\u015eimdi, farkl\u0131 veritaban\u0131 sistemleri ve programlama dilleri \u00fczerinden imle\u00e7 kullan\u0131m\u0131na dair baz\u0131 pratik \u00f6rneklere g\u00f6z atal\u0131m. Bu \u00f6rnekler, imle\u00e7lerin nas\u0131l tan\u0131mland\u0131\u011f\u0131n\u0131, a\u00e7\u0131ld\u0131\u011f\u0131n\u0131, veri getirdi\u011fini ve kapat\u0131ld\u0131\u011f\u0131n\u0131 g\u00f6sterecektir.<\/p>\n<h3>H3: PostgreSQL&#8217;de PL\/pgSQL ile \u0130mle\u00e7 Kullan\u0131m\u0131<\/h3>\n<p>PostgreSQL, g\u00fc\u00e7l\u00fc bir ili\u015fkisel veritaban\u0131 y\u00f6netim sistemidir ve PL\/pgSQL gibi prosed\u00fcrel dilleri destekler. Bu, veritaban\u0131 i\u00e7inde karma\u015f\u0131k mant\u0131klar \u00e7al\u0131\u015ft\u0131rman\u0131za olanak tan\u0131r. A\u015fa\u011f\u0131daki \u00f6rnek, bir &#8220;projeler&#8221; tablosundan, belirli bir tarihten sonra tamamlanan projeleri listeleyen bir imle\u00e7 olu\u015fturur ve bu projelerin ad\u0131n\u0131 ve tamamlanma tarihini yazd\u0131r\u0131r.<\/p>\n<div class=\"code-container\">\n<pre><code>DO $$\n  DECLARE\n    -- \u0130mle\u00e7 tan\u0131m\u0131\n    proje_imleci CURSOR FOR\n      SELECT proje_adi, tamamlanma_tarihi\n      FROM projeler\n      WHERE tamamlanma_tarihi &gt; '2023-01-01';\n\n    -- \u0130mle\u00e7ten getirilecek verileri tutacak de\u011fi\u015fkenler\n    proj_adi VARCHAR(255);\n    tamam_tarihi DATE;\n  BEGIN\n    -- \u0130mleci a\u00e7\n    OPEN proje_imleci;\n\n    -- D\u00f6ng\u00fc ile imle\u00e7ten veri getir\n    LOOP\n      -- Bir sonraki sat\u0131r\u0131 getir ve de\u011fi\u015fkenlere ata\n      FETCH NEXT FROM proje_imleci INTO proj_adi, tamam_tarihi;\n\n      -- D\u00f6ng\u00fcden \u00e7\u0131k\u0131\u015f ko\u015fulu: E\u011fer veri yoksa\n      EXIT WHEN NOT FOUND;\n\n      -- Getirilen verileri yazd\u0131r (veya ba\u015fka bir i\u015flem yap)\n      RAISE NOTICE 'Proje: %, Tamamlanma Tarihi: %', proj_adi, tamam_tarihi;\n    END LOOP;\n\n    -- \u0130mleci kapat\n    CLOSE proje_imleci;\n  END $$;<\/code><\/pre>\n<\/p><\/div>\n<p>Bu \u00f6rnekte, <code>DECLARE<\/code> blo\u011funda imle\u00e7 ve de\u011fi\u015fkenler tan\u0131mlan\u0131r. <code>OPEN<\/code> ile imle\u00e7 a\u00e7\u0131l\u0131r, <code>LOOP<\/code> ve <code>FETCH<\/code> komutlar\u0131 ile sat\u0131r sat\u0131r veri getirilir. <code>EXIT WHEN NOT FOUND<\/code> ile sonu\u00e7 k\u00fcmesinin sonuna gelindi\u011finde d\u00f6ng\u00fcden \u00e7\u0131k\u0131l\u0131r. Son olarak, <code>CLOSE<\/code> ile imle\u00e7 kapat\u0131l\u0131r. Bu, bellek verimlili\u011fi a\u00e7\u0131s\u0131ndan ideal bir yakla\u015f\u0131md\u0131r.<\/p>\n<h3>H3: Python ile PostgreSQL (psycopg2) ve \u0130mle\u00e7 Kullan\u0131m\u0131<\/h3>\n<p>Python, veri bilimi ve m\u00fchendislik projelerinde yayg\u0131n olarak kullan\u0131lan bir dildir. <code>psycopg2<\/code> k\u00fct\u00fcphanesi sayesinde PostgreSQL ile kolayca etkile\u015fim kurulabilir. Python&#8217;da imle\u00e7 kullan\u0131m\u0131, veritaban\u0131 s\u00fcr\u00fcc\u00fcs\u00fcn\u00fcn sundu\u011fu \u00f6zelliklerle sa\u011flan\u0131r.<\/p>\n<div class=\"code-container\">\n<pre><code>import psycopg2\n\n  # Veritaban\u0131 ba\u011flant\u0131 bilgileri (\u00f6rnek)\n  db_params = {\n      \"database\": \"muhendislik_db\",\n      \"user\": \"admin\",\n      \"password\": \"password\",\n      \"host\": \"localhost\",\n      \"port\": \"5432\",\n  }\n\n  conn = None\n  cur = None\n  try:\n      # Veritaban\u0131na ba\u011flan\n      conn = psycopg2.connect(**db_params)\n      # \u0130mle\u00e7 olu\u015ftur (cursor_factory=psycopg2.extras.DictCursor ile s\u00f6zl\u00fck gibi eri\u015fim)\n      cur = conn.cursor()\n\n      # \u0130mle\u00e7 tan\u0131mlayan sorgu\n      query = \"\"\"\n      SELECT parca_id, uretim_tarihi, kusur_tipi\n      FROM parca_kayitlari\n      WHERE kusur_tipi IS NOT NULL;\n      \"\"\"\n\n      # Sorguyu \u00e7al\u0131\u015ft\u0131r (bu a\u015famada imle\u00e7 tam olarak a\u00e7\u0131lmaz)\n      cur.execute(query)\n\n      # \u0130mleci kullanarak verileri getir\n      # fetchone(): tek sat\u0131r getirir\n      # fetchmany(size): belirtilen say\u0131da sat\u0131r getirir\n      # fetchall(): t\u00fcm sat\u0131rlar\u0131 getirir (dikkatli kullan\u0131lmal\u0131)\n\n      # \u00d6rnek: Sat\u0131r sat\u0131r getirme\n      print(\"Kusurlu Par\u00e7alar:\")\n      while True:\n          row = cur.fetchone()\n          if row is None:\n              break\n          parca_id, uretim_tarihi, kusur_tipi = row\n          print(f\"  Par\u00e7a ID: {parca_id}, \u00dcretim Tarihi: {uretim_tarihi}, Kusur: {kusur_tipi}\")\n\n      # Alternatif: Belirli say\u0131da sat\u0131r getirme\n      # print(\"\\n\u0130lk 10 Kusurlu Par\u00e7a:\")\n      # rows = cur.fetchmany(10)\n      # for row in rows:\n      #     parca_id, uretim_tarihi, kusur_tipi = row\n      #     print(f\"  Par\u00e7a ID: {parca_id}, \u00dcretim Tarihi: {uretim_tarihi}, Kusur: {kusur_tipi}\")\n\n  except (Exception, psycopg2.DatabaseError) as error:\n      print(f\"Hata olu\u015ftu: {error}\")\n  finally:\n      # Ba\u011flant\u0131lar\u0131 kapat\n      if cur is not None:\n          cur.close()\n      if conn is not None:\n          conn.close()\n          print(\"Veritaban\u0131 ba\u011flant\u0131s\u0131 kapat\u0131ld\u0131.\")<\/code><\/pre>\n<\/p><\/div>\n<p>Bu Python \u00f6rne\u011finde, <code>cur.execute(query)<\/code> komutu imleci haz\u0131rlar. Ard\u0131ndan <code>cur.fetchone()<\/code> veya <code>cur.fetchmany()<\/code> kullan\u0131larak veriler par\u00e7a par\u00e7a getirilir. Bu, b\u00fcy\u00fck veri k\u00fcmeleriyle \u00e7al\u0131\u015f\u0131rken bellek verimlili\u011fini sa\u011flar. <code>cur.fetchall()<\/code> komutunun dikkatli kullan\u0131lmas\u0131 gerekti\u011fi vurgulanmal\u0131d\u0131r, \u00e7\u00fcnk\u00fc bu komut t\u00fcm sonu\u00e7 k\u00fcmesini belle\u011fe y\u00fckleyebilir.<\/p>\n<h2>\u0130leri D\u00fczey Kullan\u0131m ve Optimizasyon \u0130pu\u00e7lar\u0131<\/h2>\n<p>\u0130mle\u00e7lerin temel kullan\u0131m\u0131n\u0131 anlad\u0131ktan sonra, performanslar\u0131n\u0131 daha da art\u0131rmak ve reg\u00fclatif gereksinimleri daha etkin bir \u015fekilde kar\u015f\u0131lamak i\u00e7in baz\u0131 ileri d\u00fczey teknikleri ve optimizasyonlar\u0131 g\u00f6zden ge\u00e7irebiliriz.<\/p>\n<h3>H3: Do\u011fru \u0130mle\u00e7 T\u00fcr\u00fcn\u00fc Se\u00e7mek<\/h3>\n<p>Veritaban\u0131 sistemleri genellikle farkl\u0131 imle\u00e7 t\u00fcrleri sunar. \u00d6rne\u011fin, PostgreSQL&#8217;de <code>FORWARD_ONLY<\/code>, <code>STATIC<\/code>, <code>KEYSET<\/code>, <code>SCROLLABLE<\/code> gibi se\u00e7enekler bulunur. <code>FORWARD_ONLY<\/code> imle\u00e7ler en h\u0131zl\u0131 olanlard\u0131r \u00e7\u00fcnk\u00fc sadece ileriye do\u011fru hareket ederler ve veritaban\u0131 taraf\u0131nda daha az kaynak kullan\u0131rlar. E\u011fer verileri sadece bir kez okuyacaksan\u0131z ve geri d\u00f6nmeyecekseniz, bu en iyi se\u00e7enektir. <code>SCROLLABLE<\/code> imle\u00e7ler ise daha esnektir, geriye do\u011fru hareket etmenize ve belirli bir sat\u0131ra atlaman\u0131za olanak tan\u0131r, ancak daha fazla bellek ve i\u015flem g\u00fcc\u00fc gerektirebilirler. Reg\u00fclatif m\u00fchendislikte, genellikle <code>FORWARD_ONLY<\/code> ve <code>READ_ONLY<\/code> (salt okunur) imle\u00e7ler tercih edilmelidir. Bu, verilerin yanl\u0131\u015fl\u0131kla de\u011fi\u015ftirilme riskini ortadan kald\u0131r\u0131r ve denetim s\u00fcre\u00e7lerinde tutarl\u0131l\u0131k sa\u011flar.<\/p>\n<h3>H3: Fetch Boyutunu Ayarlamak<\/h3>\n<p>Tek seferde getirilen sat\u0131r say\u0131s\u0131 (fetch size), performans\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde etkileyebilir. \u00c7ok k\u00fc\u00e7\u00fck bir fetch boyutu (\u00f6rne\u011fin, sat\u0131r sat\u0131r), veritaban\u0131 ile uygulama aras\u0131ndaki a\u011f trafi\u011fini art\u0131rabilir ve i\u015flem y\u00fck\u00fcn\u00fc y\u00fckseltebilir. \u00c7ok b\u00fcy\u00fck bir fetch boyutu ise uygulama belle\u011fini zorlayabilir. \u0130deal fetch boyutu, uygulaman\u0131z\u0131n yap\u0131s\u0131na, a\u011f h\u0131z\u0131na ve veri k\u00fcmesinin b\u00fcy\u00fckl\u00fc\u011f\u00fcne ba\u011fl\u0131 olarak de\u011fi\u015fir. Genellikle, bu boyutu deneme yan\u0131lma yoluyla veya performans testleri yaparak belirlemek en iyisidir. Baz\u0131 veritaban\u0131 s\u00fcr\u00fcc\u00fcleri (driver), bu boyutu yap\u0131land\u0131rma se\u00e7enekleri ile ayarlaman\u0131za olanak tan\u0131r.<\/p>\n<h3>H3: \u0130mle\u00e7leri \u0130\u015flem (Transaction) \u0130\u00e7inde Y\u00f6netmek<\/h3>\n<p>\u0130mle\u00e7leri bir veritaban\u0131 i\u015flemi (transaction) i\u00e7inde kullanmak, veri tutarl\u0131l\u0131\u011f\u0131n\u0131 sa\u011flamak i\u00e7in kritik \u00f6neme sahiptir. Bir i\u015flem ba\u015flad\u0131\u011f\u0131nda, imle\u00e7 \u00fczerinde yap\u0131lan t\u00fcm de\u011fi\u015fiklikler (e\u011fer imle\u00e7 yaz\u0131labilir ise) o i\u015flem tamamlanana kadar ge\u00e7ici olarak saklan\u0131r. \u0130\u015flem ba\u015far\u0131l\u0131 bir \u015fekilde tamamland\u0131\u011f\u0131nda (commit), de\u011fi\u015fiklikler kal\u0131c\u0131 hale gelir. E\u011fer i\u015flem s\u0131ras\u0131nda bir hata olu\u015fursa (rollback), yap\u0131lan t\u00fcm de\u011fi\u015fiklikler geri al\u0131n\u0131r. Bu, \u00f6zellikle reg\u00fclatif m\u00fchendislikte, verilerin her zaman do\u011fru ve tutarl\u0131 olmas\u0131n\u0131 sa\u011flamak i\u00e7in vazge\u00e7ilmezdir. \u00d6rne\u011fin, bir par\u00e7an\u0131n \u00fcretim kayd\u0131n\u0131 g\u00fcncellerken, e\u011fer g\u00fcncelleme s\u0131ras\u0131nda bir sorun \u00e7\u0131karsa, veritaban\u0131 \u00f6nceki durumuna geri d\u00f6necektir.<\/p>\n<h3>H3: Alternatif Y\u00f6ntemleri De\u011ferlendirmek<\/h3>\n<p>Her zaman ak\u0131lda tutulmas\u0131 gereken bir nokta, imle\u00e7lerin her zaman en iyi \u00e7\u00f6z\u00fcm olmayabilece\u011fidir. Baz\u0131 durumlarda, daha basit ve daha performansl\u0131 alternatifler bulunabilir:<\/p>\n<ul>\n<li><strong>Toplu \u0130\u015flemler (Bulk Operations):<\/strong> E\u011fer verileri sadece okumak veya toplu olarak g\u00fcncellemek\/silmek istiyorsan\u0131z, toplu INSERT, UPDATE veya DELETE ifadeleri genellikle imle\u00e7lerden \u00e7ok daha h\u0131zl\u0131d\u0131r.<\/li>\n<li><strong>Veritaban\u0131 Fonksiyonlar\u0131 ve Prosed\u00fcrleri:<\/strong> Karma\u015f\u0131k mant\u0131klar\u0131 veritaban\u0131 taraf\u0131nda, \u00f6zel fonksiyonlar veya sakl\u0131 prosed\u00fcrler (stored procedures) arac\u0131l\u0131\u011f\u0131yla uygulamak, uygulama taraf\u0131ndaki y\u00fck\u00fc azaltabilir ve performans\u0131 art\u0131rabilir.<\/li>\n<li><strong>Y\u0131\u011f\u0131n Sorgular (Batch Queries):<\/strong> Birden fazla k\u00fc\u00e7\u00fck sorguyu tek bir istekte g\u00f6ndermek, a\u011f gecikmesini azaltabilir.<\/li>\n<\/ul>\n<p>Reg\u00fclatif m\u00fchendislikte, verilerin do\u011frulu\u011funu ve b\u00fct\u00fcnl\u00fc\u011f\u00fcn\u00fc sa\u011flayan en uygun y\u00f6ntemi se\u00e7mek esast\u0131r. \u0130mle\u00e7ler, \u00f6zellikle ad\u0131m ad\u0131m i\u015fleme ihtiya\u00e7 duyuldu\u011funda g\u00fc\u00e7l\u00fc bir ara\u00e7 olsa da, her zaman ilk tercih olmamal\u0131d\u0131r.<\/p>\n<h2>Vaka Analizi: Havac\u0131l\u0131k Sekt\u00f6r\u00fcnde Kalite Kontrol Verilerinin Y\u00f6netimi<\/h2>\n<p>Havac\u0131l\u0131k sekt\u00f6r\u00fc, en s\u0131k\u0131 reg\u00fclasyonlara tabi olan alanlardan biridir. Her bir bile\u015fenin ve \u00fcretilen her bir u\u00e7a\u011f\u0131n ge\u00e7mi\u015fi, kullan\u0131lan malzemeler, \u00fcretim s\u00fcre\u00e7leri ve kalite kontrol sonu\u00e7lar\u0131 titizlikle belgelenmelidir. Bir havac\u0131l\u0131k firmas\u0131, binlerce u\u00e7ak par\u00e7as\u0131 i\u00e7in milyarlarca kay\u0131t i\u00e7eren bir veritaban\u0131na sahip oldu\u011funu varsayal\u0131m. Bu veritaban\u0131, her par\u00e7an\u0131n \u00fcretiminden montaj\u0131na, testlerinden bak\u0131m ge\u00e7mi\u015fine kadar t\u00fcm bilgileri bar\u0131nd\u0131r\u0131yor.<\/p>\n<p><strong>Problem:<\/strong> Kalite kontrol m\u00fchendisleri, belirli bir par\u00e7a t\u00fcr\u00fcndeki t\u00fcm \u00fcretim hatalar\u0131n\u0131 ve bu hatalar\u0131n nedenlerini analiz etmek istiyorlar. Bu, potansiyel tasar\u0131m kusurlar\u0131n\u0131 veya \u00fcretim s\u00fcre\u00e7lerindeki sorunlar\u0131 tespit etmek i\u00e7in kritiktir. Veri k\u00fcmesi o kadar b\u00fcy\u00fckt\u00fcr ki, t\u00fcm hatal\u0131 par\u00e7a kay\u0131tlar\u0131n\u0131 tek seferde \u00e7ekmek hem imkans\u0131z hem de gereksizdir.<\/p>\n<p><strong>\u00c7\u00f6z\u00fcm:<\/strong> M\u00fchendisler, veritaban\u0131 imle\u00e7lerini kullanarak bu analizi ger\u00e7ekle\u015ftirir. \u00d6ncelikle, belirli bir kusur t\u00fcr\u00fcne sahip veya belirli bir \u00fcretim band\u0131ndan \u00e7\u0131kan par\u00e7alar\u0131 listeleyen bir SQL sorgusu olu\u015ftururlar. Ard\u0131ndan, bu sorgu \u00fczerinde bir imle\u00e7 tan\u0131mlarlar. Bu imle\u00e7, sonu\u00e7 k\u00fcmesinden belirli say\u0131da (\u00f6rne\u011fin, 500) hatal\u0131 par\u00e7a kayd\u0131n\u0131 tek seferde getirir. M\u00fchendisler, bu 500 kayd\u0131 analiz eder, potansiyel nedenleri belirler ve gerekli d\u00fczeltici faaliyetleri planlar. Analiz tamamland\u0131ktan sonra, imle\u00e7 bir sonraki 500 kayd\u0131 getirir. Bu s\u00fcre\u00e7, t\u00fcm hatal\u0131 kay\u0131tlar incelenene kadar devam eder.<\/p>\n<p><strong>Faydalar\u0131:<\/strong><\/p>\n<ul>\n<li><strong>Bellek Optimizasyonu:<\/strong> T\u00fcm veri k\u00fcmesinin belle\u011fe y\u00fcklenmesi gerekmedi\u011fi i\u00e7in uygulama performans\u0131 y\u00fcksek kal\u0131r ve sistem kararl\u0131l\u0131\u011f\u0131 sa\u011flan\u0131r.<\/li>\n<li><strong>Kontroll\u00fc Analiz:<\/strong> M\u00fchendisler, verileri ad\u0131m ad\u0131m inceleyerek daha derinlemesine analiz yapabilir ve her bir hata kayd\u0131na odaklanabilirler.<\/li>\n<li><strong>\u0130zlenebilirlik:<\/strong> \u0130mle\u00e7 kullan\u0131larak yap\u0131lan her bir veri \u00e7ekme ve analiz ad\u0131m\u0131, veritaban\u0131 i\u015flem kay\u0131tlar\u0131nda tutulabilir. Bu, denetim s\u00fcre\u00e7lerinde kritik \u00f6neme sahiptir.<\/li>\n<li><strong>Veri B\u00fct\u00fcnl\u00fc\u011f\u00fc:<\/strong> Salt okunur (read-only) imle\u00e7ler kullan\u0131larak, verilerin yanl\u0131\u015fl\u0131kla de\u011fi\u015ftirilmesi riski ortadan kald\u0131r\u0131l\u0131r.<\/li>\n<\/ul>\n<p>Bu vaka analizi, reg\u00fclatif m\u00fchendislikte imle\u00e7lerin sadece teknik bir ara\u00e7 olman\u0131n \u00f6tesinde, kritik veri y\u00f6netimi ve analiz s\u00fcre\u00e7lerinin temel bir par\u00e7as\u0131 oldu\u011funu g\u00f6stermektedir.<\/p>\n<h2>S\u0131k\u00e7a Sorulan Sorular (SSS)<\/h2>\n<h3>H3: \u0130mle\u00e7ler her zaman daha yava\u015f m\u0131d\u0131r?<\/h3>\n<p>Hay\u0131r, her zaman daha yava\u015f de\u011fildir. \u0130mle\u00e7ler, \u00f6zellikle b\u00fcy\u00fck veri k\u00fcmeleriyle \u00e7al\u0131\u015f\u0131rken veya sat\u0131r baz\u0131nda karma\u015f\u0131k i\u015flemler gerekti\u011finde, bellek kullan\u0131m\u0131n\u0131 optimize ederek ve a\u011f trafi\u011fini azaltarak performans\u0131 art\u0131rabilir. Ancak, basit sorgular i\u00e7in toplu i\u015flemler (bulk operations) genellikle daha h\u0131zl\u0131d\u0131r.<\/p>\n<h3>H3: \u0130mle\u00e7ler g\u00fcvenlik riskleri ta\u015f\u0131r m\u0131?<\/h3>\n<p>\u0130mle\u00e7lerin kendisi do\u011frudan bir g\u00fcvenlik riski ta\u015f\u0131maz. Ancak, imle\u00e7ler arac\u0131l\u0131\u011f\u0131yla eri\u015filen verilerin yetkilendirilmesi ve imle\u00e7lerin salt okunur (read-only) olarak kullan\u0131lmas\u0131, veri g\u00fcvenli\u011fini sa\u011flamak a\u00e7\u0131s\u0131ndan \u00f6nemlidir. Yanl\u0131\u015f yap\u0131land\u0131r\u0131lm\u0131\u015f imle\u00e7ler veya yetkisiz eri\u015fim, veri ihlallerine yol a\u00e7abilir.<\/p>\n<h3>H3: Hangi veritaban\u0131 sistemleri imle\u00e7leri destekler?<\/h3>\n<p>Neredeyse t\u00fcm modern ili\u015fkisel veritaban\u0131 y\u00f6netim sistemleri (SQL Server, PostgreSQL, MySQL, Oracle, DB2 vb.) imle\u00e7leri destekler. Ancak, her sistemin imle\u00e7leri tan\u0131mlama ve kullanma s\u00f6zdizimi (syntax) ve sundu\u011fu \u00f6zellikler biraz farkl\u0131l\u0131k g\u00f6sterebilir.<\/p>\n<h3>H3: \u0130mle\u00e7 kullanman\u0131n en b\u00fcy\u00fck dezavantaj\u0131 nedir?<\/h3>\n<p>En b\u00fcy\u00fck dezavantaj\u0131, a\u015f\u0131r\u0131 veya yanl\u0131\u015f kullan\u0131ld\u0131\u011f\u0131nda performans d\u00fc\u015f\u00fc\u015f\u00fcne neden olabilmesidir. Ayr\u0131ca, imle\u00e7ler, veritaban\u0131 kaynaklar\u0131n\u0131 daha fazla t\u00fcketebilir ve kodun okunabilirli\u011fini ve bak\u0131m\u0131n\u0131 zorla\u015ft\u0131rabilir.<\/p>\n<h2>Sonu\u00e7<\/h2>\n<p>Veritaban\u0131 imle\u00e7leri (cursor), reg\u00fclatif m\u00fchendislik ekipleri i\u00e7in b\u00fcy\u00fck veri k\u00fcmeleriyle ba\u015fa \u00e7\u0131kmak, karma\u015f\u0131k veri i\u015fleme g\u00f6revlerini yerine getirmek ve veri b\u00fct\u00fcnl\u00fc\u011f\u00fcn\u00fc sa\u011flamak ad\u0131na vazge\u00e7ilmez ara\u00e7lard\u0131r. Do\u011fru senaryolarda kullan\u0131ld\u0131\u011f\u0131nda, bellek kullan\u0131m\u0131n\u0131 optimize eder, performans\u0131 art\u0131r\u0131r ve veri analiz s\u00fcre\u00e7lerini daha kontroll\u00fc hale getirir. Ancak, imle\u00e7lerin performans \u00fczerindeki potansiyel etkileri g\u00f6z ard\u0131 edilmemeli ve her zaman toplu i\u015flemler veya di\u011fer veritaban\u0131 optimizasyon teknikleriyle kar\u015f\u0131la\u015ft\u0131r\u0131lmal\u0131d\u0131r. Reg\u00fclatif bir ortamda, imle\u00e7lerin salt okunur olarak kullan\u0131lmas\u0131 ve veritaban\u0131 i\u015flemleri (transactions) i\u00e7inde y\u00f6netilmesi, veri g\u00fcvenli\u011fi ve tutarl\u0131l\u0131\u011f\u0131 a\u00e7\u0131s\u0131ndan kritik \u00f6neme sahiptir. Bu makalede sunulan bilgiler ve \u00f6rnekler, m\u00fchendislik ekiplerinin imle\u00e7leri daha bilin\u00e7li ve etkili bir \u015fekilde kullanmalar\u0131na yard\u0131mc\u0131 olacakt\u0131r.<\/p>\n<p>#Veritaban\u0131 #M\u00fchendislik #SQL #Cursor #VeriY\u00f6netimi #Reg\u00fclasyon #Teknoloji<\/p>\n<div class=\"github-example-link\"><strong>\u00d6rnek kod:<\/strong> <a href=\"https:\/\/github.com\/fatihsoysalcom\/database-cursor-efficiency-example\" target=\"_blank\" rel=\"noopener noreferrer\">github.com\/fatihsoysalcom\/database-cursor-efficiency-example<\/a><\/div>\n","protected":false},"excerpt":{"rendered":"M\u00fchendislik projelerinde veri y\u00f6netimi, kritik s\u00fcre\u00e7lerin temelini olu\u015fturur.","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"csco_page_header_type":"","csco_page_load_nextpost":"","csco_page_subscribe_form":"","csco_page_contact_form":"","footnotes":""},"categories":[1],"tags":[],"class_list":{"0":"post-45390","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-genel","7":"cs-entry","8":"cs-video-wrap"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v20.5 (Yoast SEO v25.3.1) - 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