{"id":27600,"date":"2025-08-16T09:15:24","date_gmt":"2025-08-16T06:15:24","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-bir-sutunda-birden-fazla-metni-degistirme\/"},"modified":"2025-08-16T09:15:24","modified_gmt":"2025-08-16T06:15:24","slug":"postgresql-bir-sutunda-birden-fazla-metni-degistirme","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-bir-sutunda-birden-fazla-metni-degistirme\/","title":{"rendered":"PostgreSQL: Bir S\u00fctunda Birden Fazla Metni De\u011fi\u015ftirme"},"content":{"rendered":"<p># PostgreSQL&#8217;de Bir S\u00fctunda Birden Fazla Metin De\u011fi\u015ftirme<\/p>\n<p>PostgreSQL veritaban\u0131n\u0131zda, bir s\u00fctun i\u00e7indeki metin verilerinde birden fazla de\u011fi\u015fiklik yapman\u0131z gerekiyor mu?  \u00d6rne\u011fin, bir \u00fcr\u00fcn katalo\u011funda eski \u00fcr\u00fcn adlar\u0131n\u0131 yenileriyle de\u011fi\u015ftirmek, metinlerde standartla\u015ft\u0131rma yapmak veya hatal\u0131 yaz\u0131m d\u00fczeltmeleri uygulamak gibi durumlar s\u0131kl\u0131kla kar\u015f\u0131la\u015f\u0131labilir.  Bu makalede, PostgreSQL&#8217;de bir s\u00fctun i\u00e7inde birden fazla metin dizisini nas\u0131l etkili ve verimli bir \u015fekilde de\u011fi\u015ftirece\u011finizi ad\u0131m ad\u0131m, farkl\u0131 seviyelerdeki kullan\u0131c\u0131lar i\u00e7in a\u00e7\u0131klayaca\u011f\u0131z.  Veritaban\u0131 optimizasyon tekniklerini ve performans analizini de ele alarak, ger\u00e7ek d\u00fcnya senaryolar\u0131na dayal\u0131 \u00f6rneklerle konuyu detayl\u0131 bir \u015fekilde inceleyece\u011fiz.<\/p>\n<p><strong>\u00d6\u011frenme Yol Haritas\u0131<\/strong><\/p>\n<p>Bu makale, PostgreSQL&#8217;de birden fazla metin de\u011fi\u015ftirme i\u015flemini farkl\u0131 seviyelerdeki kullan\u0131c\u0131lar i\u00e7in a\u00e7\u0131klayacakt\u0131r:<\/p>\n<p><strong>Yeni Ba\u015flayan:<\/strong>  <code class=\"language-\">REPLACE<\/code> fonksiyonunun temel kullan\u0131m\u0131, basit kod \u00f6rnekleri ve ad\u0131m ad\u0131m a\u00e7\u0131klamalar.<\/p>\n<p><strong>Orta Seviye:<\/strong> Ger\u00e7ek d\u00fcnya senaryolar\u0131na dayal\u0131 \u00f6rnekler,  <code class=\"language-\">regexp_replace<\/code> fonksiyonunun kullan\u0131m\u0131, optimizasyon ipu\u00e7lar\u0131 ve performans de\u011ferlendirmesi.<\/p>\n<p><strong>\u0130leri Seviye:<\/strong>  Karma\u015f\u0131k metin de\u011fi\u015ftirme senaryolar\u0131, performans analizi, edge case&#8217;ler ve farkl\u0131 yakla\u015f\u0131m y\u00f6ntemlerinin kar\u015f\u0131la\u015ft\u0131r\u0131lmas\u0131.<\/p>\n<p><strong>PostgreSQL&#8217;de Metin \u0130\u015fleme Temelleri<\/strong><\/p>\n<p>PostgreSQL, g\u00fc\u00e7l\u00fc metin i\u015fleme fonksiyonlar\u0131na sahiptir.  Bu fonksiyonlar, veritaban\u0131n\u0131zdaki metin verilerini manip\u00fcle etmenizi sa\u011flar.  En temel fonksiyonlardan biri <code class=\"language-\">REPLACE<\/code> fonksiyonudur. Bu fonksiyon, bir metin i\u00e7indeki belirli bir alt dizinin t\u00fcm \u00f6rneklerini ba\u015fka bir alt diziyle de\u011fi\u015ftirir.  \u00d6rne\u011fin, <code class=\"language-\">REPLACE('Merhaba D\u00fcnya', 'D\u00fcnya', 'Ay')<\/code> sorgusu, &#8216;Merhaba Ay&#8217; sonucunu \u00fcretir.  Ancak, birden fazla de\u011fi\u015fiklik yapman\u0131z gerekti\u011finde, her de\u011fi\u015fiklik i\u00e7in ayr\u0131 bir <code class=\"language-\">REPLACE<\/code> fonksiyonu kullanman\u0131z gerekebilir, bu da karma\u015f\u0131k ve okunmas\u0131 zor sorgulara yol a\u00e7abilir.  Daha karma\u015f\u0131k durumlar i\u00e7in, d\u00fczenli ifadeleri kullanan <code class=\"language-\">regexp_replace<\/code> fonksiyonu daha g\u00fc\u00e7l\u00fc ve esnek bir \u00e7\u00f6z\u00fcm sunar.<\/p>\n<p><strong>Birden Fazla Metin De\u011fi\u015ftirmesi: Ad\u0131m Ad\u0131m Uygulamal\u0131 K\u0131lavuz (Yeni Ba\u015flayan)<\/strong><\/p>\n<p>\u00d6ncelikle basit bir senaryo ele alal\u0131m.  Bir &#8220;\u00fcr\u00fcn_adi&#8221; s\u00fctununda baz\u0131 \u00fcr\u00fcn adlar\u0131n\u0131 g\u00fcncellememiz gerekiyor:<\/p>\n<p>| \u00fcr\u00fcn_adi          |<br \/>\n|&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-|<br \/>\n| Eski Telefon Modeli |<br \/>\n| Eski Bilgisayar     |<br \/>\n| Eski Tablet        |<\/p>\n<p>Yeni isimleri \u015fu \u015fekilde olsun:<\/p>\n<p>* Eski Telefon Modeli -> Yeni Telefon<br \/>\n* Eski Bilgisayar -> Yeni Bilgisayar Pro<br \/>\n* Eski Tablet -> Yeni Tablet Ultra<\/p>\n<p>Bunlar\u0131 <code class=\"language-\">REPLACE<\/code> fonksiyonunu ard arda kullanarak yapabiliriz:<\/p>\n<pre class=\"language-sql\"><code>UPDATE urunler\nSET urun_adi = REPLACE(REPLACE(REPLACE(urun_adi, 'Eski Telefon Modeli', 'Yeni Telefon'), 'Eski Bilgisayar', 'Yeni Bilgisayar Pro'), 'Eski Tablet', 'Yeni Tablet Ultra');<\/code><\/pre>\n<p>Bu y\u00f6ntem, az say\u0131da de\u011fi\u015fiklik i\u00e7in uygundur ancak \u00e7ok say\u0131da de\u011fi\u015fiklik durumunda okunabilirlik ve bak\u0131m a\u00e7\u0131s\u0131ndan sorunlara yol a\u00e7abilir.  Daha iyi bir yakla\u015f\u0131m, bir fonksiyon kullanmakt\u0131r.<\/p>\n<p><strong>Birden Fazla Metin De\u011fi\u015ftirmesi: Fonksiyon Kullan\u0131m\u0131 (Orta Seviye)<\/strong><\/p>\n<p>Daha temiz ve \u00f6l\u00e7eklenebilir bir \u00e7\u00f6z\u00fcm i\u00e7in, bir fonksiyon kullanabiliriz. Bu fonksiyon, bir metin ve de\u011fi\u015fiklikleri i\u00e7eren bir diziyi al\u0131r ve t\u00fcm de\u011fi\u015fiklikleri uygular:<\/p>\n<pre class=\"language-sql\"><code>CREATE OR REPLACE FUNCTION replace_multiple(text, text[])\nRETURNS text AS $$\nDECLARE\n  i INTEGER;\n  deger TEXT;\nBEGIN\n  deger := $1;\n  FOR i IN 1..array_upper($2, 1) LOOP\n    deger := REPLACE(deger, $2[i*2-1], $2[i*2]);\n  END LOOP;\n  RETURN deger;\nEND;\n$$ LANGUAGE plpgsql;\n\nUPDATE urunler\nSET urun_adi = replace_multiple(urun_adi, ARRAY['Eski Telefon Modeli', 'Yeni Telefon', 'Eski Bilgisayar', 'Yeni Bilgisayar Pro', 'Eski Tablet', 'Yeni Tablet Ultra']);<\/code><\/pre>\n<p>Bu fonksiyon, \u00e7ift say\u0131da dizi eleman\u0131 al\u0131r: her \u00e7ift, eski ve yeni de\u011feri temsil eder. Bu yakla\u015f\u0131m, de\u011fi\u015fiklikleri daha organize bir \u015fekilde y\u00f6netmemizi sa\u011flar.  [fatihsoysal.com](https:\/\/fatihsoysal.com) adresindeki di\u011fer makalelerimizde fonksiyon yaz\u0131m\u0131na dair daha fazla bilgi bulabilirsiniz.<\/p>\n<p><strong>D\u00fczenli \u0130fadeler ile Metin De\u011fi\u015ftirme (Orta Seviye)<\/strong><\/p>\n<p>Daha karma\u015f\u0131k metin de\u011fi\u015ftirme i\u015flemleri i\u00e7in d\u00fczenli ifadeler kullanabiliriz. <code class=\"language-\">regexp_replace<\/code> fonksiyonu, d\u00fczenli ifadelerle e\u015fle\u015fen alt dizileri de\u011fi\u015ftirmemizi sa\u011flar.  \u00d6rne\u011fin, t\u00fcm say\u0131sal de\u011ferleri &#8216;*&#8217; ile de\u011fi\u015ftirmek i\u00e7in:<\/p>\n<pre class=\"language-sql\"><code>UPDATE urunler\nSET urun_adi = regexp_replace(urun_adi, '\\d+', '*');<\/code><\/pre>\n<p>Bu \u00f6rnekte, <code class=\"language-\">\\d+<\/code> d\u00fczenli ifadesi bir veya daha fazla say\u0131sal karakteri temsil eder.<\/p>\n<p><strong>Ger\u00e7ek D\u00fcnya Senaryosu:  E-Ticaret \u00dcr\u00fcn Katalogu G\u00fcncellemesi<\/strong><\/p>\n<p>Bir e-ticaret sitesinde, \u00fcr\u00fcn adlar\u0131nda bulunan marka isimlerini g\u00fcncellememiz gerekiyor.  Eski marka ad\u0131 &#8220;MarkaX&#8221; iken, yeni marka ad\u0131 &#8220;MarkaY&#8221; olsun.  \u00dcr\u00fcn adlar\u0131 farkl\u0131 formatlarda olabilir:  &#8220;MarkaX Telefon&#8221;, &#8220;MarkaX-Telefon&#8221;, &#8220;Telefon MarkaX&#8221;.  Bu durumda, <code class=\"language-\">regexp_replace<\/code> fonksiyonu ile esnek bir \u00e7\u00f6z\u00fcm geli\u015ftirebiliriz:<\/p>\n<pre class=\"language-sql\"><code>UPDATE urunler\nSET urun_adi = regexp_replace(urun_adi, 'MarkaX', 'MarkaY', 'gi')<\/code><\/pre>\n<p><code class=\"language-\">'gi'<\/code> bayra\u011f\u0131, b\u00fcy\u00fck\/k\u00fc\u00e7\u00fck harf duyarl\u0131l\u0131\u011f\u0131n\u0131 ortadan kald\u0131r\u0131r ve t\u00fcm e\u015fle\u015fmeleri de\u011fi\u015ftirir.<\/p>\n<p><strong>Performans Optimizasyonu (\u0130leri Seviye)<\/strong><\/p>\n<p>B\u00fcy\u00fck veritabanlar\u0131nda, metin de\u011fi\u015ftirme i\u015flemleri performans\u0131 etkileyebilir.  A\u015fa\u011f\u0131daki y\u00f6ntemler performans\u0131 iyile\u015ftirmeye yard\u0131mc\u0131 olabilir:<\/p>\n<p>* <strong>\u0130ndeksler:<\/strong>  <code class=\"language-\">urun_adi<\/code> s\u00fctununa bir indeks eklemek, g\u00fcncelleme i\u015flemini h\u0131zland\u0131rabilir.<br \/>\n* <strong>\u0130\u015flem Boyutu:<\/strong> B\u00fcy\u00fck i\u015flemleri daha k\u00fc\u00e7\u00fck par\u00e7alara b\u00f6lmek, performans\u0131 art\u0131rabilir.<br \/>\n* <strong>Fonksiyon Optimizasyonu:<\/strong>  Kullan\u0131lan fonksiyonlar\u0131n performans\u0131n\u0131 analiz edip optimize etmek \u00f6nemlidir.  <code class=\"language-\">EXPLAIN ANALYZE<\/code> komutu ile sorgu plan\u0131n\u0131 inceleyebilirsiniz.<br \/>\n* <strong>Paralel \u0130\u015fleme:<\/strong>  PostgreSQL&#8217;in paralel i\u015fleme yeteneklerinden yararlanabilirsiniz.<\/p>\n<p><strong>Edge Case&#8217;ler ve Karma\u015f\u0131k Senaryolar (\u0130leri Seviye)<\/strong><\/p>\n<p>Baz\u0131 durumlarda, metin de\u011fi\u015ftirme i\u015flemleri beklenmedik sonu\u00e7lar \u00fcretebilir. \u00d6rne\u011fin,  &#8220;Elma Armut Elma&#8221; metninde &#8220;Elma&#8221;y\u0131 &#8220;Kiraz&#8221; ile de\u011fi\u015ftirmek istedi\u011fimizde, t\u00fcm &#8220;Elma&#8221;lar &#8220;Kiraz&#8221; ile de\u011fi\u015ftirilmelidir.  Ancak,  yanl\u0131\u015f d\u00fczenli ifade kullan\u0131m\u0131 veya fonksiyon hatalar\u0131 beklenmedik sonu\u00e7lara yol a\u00e7abilir.  Bu gibi durumlarda, sorguyu dikkatlice test etmek ve gerekiyorsa daha karma\u015f\u0131k d\u00fczenli ifadeler veya algoritmalar kullanmak \u00f6nemlidir.<\/p>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p>PostgreSQL&#8217;de bir s\u00fctunda birden fazla metin dizisini de\u011fi\u015ftirmek i\u00e7in farkl\u0131 y\u00f6ntemler mevcuttur.  <code class=\"language-\">REPLACE<\/code> fonksiyonu basit de\u011fi\u015fiklikler i\u00e7in uygundur, ancak daha karma\u015f\u0131k senaryolar i\u00e7in fonksiyonlar veya <code class=\"language-\">regexp_replace<\/code> fonksiyonu ile d\u00fczenli ifadeler kullanmak daha etkilidir.  Performans optimizasyonu ve edge case&#8217;leri dikkate alarak, veritaban\u0131n\u0131zdaki metin verilerini verimli bir \u015fekilde g\u00fcncelleyebilirsiniz.  [fatihsoysal.com](https:\/\/fatihsoysal.com) adresinden PostgreSQL ile ilgili daha fazla bilgi edinebilirsiniz.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular:<\/strong><\/p>\n<p>1. <strong><code class=\"language-\">regexp_replace<\/code> fonksiyonunun s\u0131n\u0131rlamalar\u0131 nelerdir?<\/strong>  <code class=\"language-\">regexp_replace<\/code> fonksiyonu g\u00fc\u00e7l\u00fcd\u00fcr, ancak karma\u015f\u0131k d\u00fczenli ifadeler performans\u0131 etkileyebilir.<br \/>\n2. <strong>B\u00fcy\u00fck veritabanlar\u0131nda performans\u0131 nas\u0131l iyile\u015ftirebilirim?<\/strong>  \u0130ndeksler, i\u015flem boyutunu k\u00fc\u00e7\u00fcltme, fonksiyon optimizasyonu ve paralel i\u015fleme kullanabilirsiniz.<br \/>\n3. <strong>Hatal\u0131 bir metin de\u011fi\u015ftirme i\u015flemini nas\u0131l geri alabilirim?<\/strong>  Veritaban\u0131n\u0131z\u0131n yede\u011fini alarak veya <code class=\"language-\">ROLLBACK<\/code> komutunu kullanarak geri alabilirsiniz.<br \/>\n4. <strong>Metin de\u011fi\u015ftirme i\u015flemlerini otomatikle\u015ftirmek m\u00fcmk\u00fcn m\u00fcd\u00fcr?<\/strong>  Evet, programlama dilleri ve PostgreSQL&#8217;in API&#8217;lerini kullanarak otomatikle\u015ftirme yapabilirsiniz.<br \/>\n5. <strong>Karakter kodlamas\u0131 sorunlar\u0131yla nas\u0131l ba\u015fa \u00e7\u0131kabilirim?<\/strong>  Karakter kodlamalar\u0131n\u0131 do\u011fru bir \u015fekilde ayarlamak ve kullanmak \u00f6nemlidir.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL&#8217;de Bir S\u00fctunda Birden Fazla Metin De\u011fi\u015ftirme PostgreSQL veritaban\u0131n\u0131zda, bir s\u00fctun i\u00e7indeki metin verilerinde birden fazla de\u011fi\u015fiklik&hellip;","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":[644],"tags":[],"class_list":{"0":"post-27600","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-postgresql","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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