{"id":25666,"date":"2025-07-11T03:15:24","date_gmt":"2025-07-11T00:15:24","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/postgresql-json-dizisindeki-son-ogeyi-nasil-alinir\/"},"modified":"2025-07-11T03:15:24","modified_gmt":"2025-07-11T00:15:24","slug":"postgresql-json-dizisindeki-son-ogeyi-nasil-alinir","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/postgresql-json-dizisindeki-son-ogeyi-nasil-alinir\/","title":{"rendered":"PostgreSQL: JSON Dizisindeki Son \u00d6\u011feyi Nas\u0131l Al\u0131n\u0131r"},"content":{"rendered":"<p># PostgreSQL&#8217;de JSON Dizisinin Son \u00d6\u011fesini Alma<\/p>\n<p>PostgreSQL veritaban\u0131n\u0131zda JSON verisiyle \u00e7al\u0131\u015f\u0131yor ve bu verinin i\u00e7indeki JSON dizilerinin son \u00f6\u011fesine h\u0131zl\u0131ca eri\u015fmeniz mi gerekiyor?  Bu makale, PostgreSQL&#8217;de JSON dizilerinin son \u00f6\u011fesini alma i\u015flemini ad\u0131m ad\u0131m, yeni ba\u015flayanlardan ileri seviye kullan\u0131c\u0131lara kadar herkesin anlayabilece\u011fi \u015fekilde a\u00e7\u0131klayacakt\u0131r.  Veritaban\u0131n\u0131zdaki verimlili\u011fi art\u0131rmak i\u00e7in performans optimizasyon tekniklerini ve ger\u00e7ek d\u00fcnya senaryolar\u0131n\u0131 da ele alaca\u011f\u0131z.<\/p>\n<p><strong>\u00d6\u011frenme Yol Haritas\u0131:<\/strong><\/p>\n<p>* <strong>Yeni Ba\u015flayan:<\/strong> <code class=\"language-\">jsonb_array_length()<\/code> ve <code class=\"language-\">->><\/code> operat\u00f6rlerini kullanarak basit bir JSON dizisinin son \u00f6\u011fesini alma.<br \/>\n* <strong>Orta:<\/strong>  Ger\u00e7ek d\u00fcnya senaryolar\u0131, ko\u015fullu i\u015flemler ve performans optimizasyon ipu\u00e7lar\u0131.<br \/>\n* <strong>\u0130leri D\u00fczey:<\/strong> Performans analizi,  null de\u011ferler ve bo\u015f dizilerle ba\u015fa \u00e7\u0131kma,  karma\u015f\u0131k JSON yap\u0131lar\u0131ndaki son \u00f6\u011felere eri\u015fim.<\/p>\n<p><strong>PostgreSQL ve JSON Veri Tipi: Temel Kavramlar<\/strong><\/p>\n<p>PostgreSQL 9.4 s\u00fcr\u00fcm\u00fcnden itibaren yerle\u015fik olarak JSON ve JSONB veri tiplerini desteklemektedir.  JSON (JavaScript Object Notation), veriyi insan taraf\u0131ndan okunabilir ve makine taraf\u0131ndan i\u015flenebilir bir formatta saklamak i\u00e7in kullan\u0131lan bir standartt\u0131r. JSONB ise, JSON&#8217;\u0131n ikili format\u0131d\u0131r ve daha h\u0131zl\u0131 arama ve indeksleme olana\u011f\u0131 sa\u011flar.  JSONB, \u00f6zellikle b\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in tercih edilir.  Bu makalede, performans avantajlar\u0131 nedeniyle JSONB veri tipini kullanaca\u011f\u0131z.<\/p>\n<p>JSONB verisi, anahtar-de\u011fer \u00e7iftleri ve dizilerden olu\u015fur.  Bir JSONB dizisi, k\u00f6\u015feli parantezler (<code class=\"language-\">[]<\/code>) i\u00e7inde virg\u00fclle ayr\u0131lm\u0131\u015f \u00f6\u011felerden olu\u015fur.  \u00d6rne\u011fin, <code class=\"language-\">[{\"ad\":\"Ali\",\"yas\":30}, {\"ad\":\"Ay\u015fe\",\"yas\":25}, {\"ad\":\"Veli\",\"yas\":35}]<\/code>  bir JSONB dizisidir.  Bu dizideki her \u00f6\u011fe, bir JSONB nesnesidir.  Amac\u0131m\u0131z, bu dizinin son \u00f6\u011fesine, yani <code class=\"language-\">\"Veli\"<\/code> ve <code class=\"language-\">35<\/code> de\u011ferlerini i\u00e7eren nesneye ula\u015fmakt\u0131r.<\/p>\n<p><strong>PostgreSQL&#8217;de JSONB Dizisinin Son \u00d6\u011fesini Alma: Yeni Ba\u015flayanlar \u0130\u00e7in<\/strong><\/p>\n<p>En basit yakla\u015f\u0131m, <code class=\"language-\">jsonb_array_length()<\/code> fonksiyonunu dizinin uzunlu\u011funu bulmak ve <code class=\"language-\">->><\/code> operat\u00f6r\u00fcn\u00fc belirli indeksteki \u00f6\u011feye eri\u015fmek i\u00e7in kullanmakt\u0131r.  Dizinin son \u00f6\u011fesine ula\u015fmak i\u00e7in, uzunluktan 1 \u00e7\u0131karmal\u0131y\u0131z \u00e7\u00fcnk\u00fc dizinler 0&#8217;dan ba\u015flar.<\/p>\n<p>\u0130\u015fte basit bir \u00f6rnek:<\/p>\n<pre class=\"language-sql\"><code>CREATE TABLE urunler (\n    id SERIAL PRIMARY KEY,\n    ozellikler JSONB\n);\n\nINSERT INTO urunler (ozellikler) VALUES ('[{&quot;renk&quot;:&quot;k\u0131rm\u0131z\u0131&quot;}, {&quot;renk&quot;:&quot;mavi&quot;}, {&quot;renk&quot;:&quot;ye\u015fil&quot;}]');\n\nSELECT ozellikler -&gt;&gt; (jsonb_array_length(ozellikler) - 1)::text AS son_ozellik FROM urunler;<\/code><\/pre>\n<p>Bu sorgu, <code class=\"language-\">ozellikler<\/code> s\u00fctunundaki JSONB dizisinin son \u00f6\u011fesini (ye\u015fil) d\u00f6nd\u00fcr\u00fcr.  <code class=\"language-\">(jsonb_array_length(ozellikler) - 1)::text<\/code> k\u0131sm\u0131, dizinin uzunlu\u011funu bulur, 1 \u00e7\u0131kar\u0131r ve sonucu metin tipine d\u00f6n\u00fc\u015ft\u00fcr\u00fcr.  <code class=\"language-\">->><\/code> operat\u00f6r\u00fc, JSONB dizisinden belirtilen indeksteki \u00f6\u011feyi metin olarak d\u00f6nd\u00fcr\u00fcr.<\/p>\n<p><strong>JSONB Dizisinin Son \u00d6\u011fesini Alma: Orta Seviye Kullan\u0131c\u0131lar \u0130\u00e7in<\/strong><\/p>\n<p>\u015eimdi, ger\u00e7ek d\u00fcnya senaryolar\u0131n\u0131 ve performans optimizasyonunu ele alal\u0131m.  \u00d6rne\u011fin, bir e-ticaret uygulamas\u0131nda, her \u00fcr\u00fcn\u00fcn ge\u00e7mi\u015f fiyatlar\u0131n\u0131 i\u00e7eren bir JSONB dizisi olabilir.  Bu dizinin son \u00f6\u011fesi, \u00fcr\u00fcn\u00fcn en g\u00fcncel fiyat\u0131n\u0131 temsil eder.<\/p>\n<pre class=\"language-sql\"><code>CREATE TABLE urun_fiyatlari (\n    urun_id INTEGER,\n    fiyat_gecmisi JSONB\n);\n\nINSERT INTO urun_fiyatlari (urun_id, fiyat_gecmisi) VALUES\n(1, '[{&quot;tarih&quot;:&quot;2023-10-26&quot;,&quot;fiyat&quot;:100}, {&quot;tarih&quot;:&quot;2023-10-27&quot;,&quot;fiyat&quot;:110}, {&quot;tarih&quot;:&quot;2023-10-28&quot;,&quot;fiyat&quot;:120}]');\n\nSELECT urun_id, (fiyat_gecmisi -&gt;&gt; (jsonb_array_length(fiyat_gecmisi) - 1))::numeric AS son_fiyat\nFROM urun_fiyatlari\nWHERE urun_id = 1;<\/code><\/pre>\n<p>Bu \u00f6rnekte, <code class=\"language-\">::numeric<\/code> d\u00f6n\u00fc\u015f\u00fcm\u00fc ile son fiyat de\u011ferini say\u0131sal olarak al\u0131yoruz.  B\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in, <code class=\"language-\">jsonb_array_length()<\/code> fonksiyonunun performans\u0131n\u0131 art\u0131rmak i\u00e7in indeksleme kullanmak \u00f6nemlidir.  Ancak, JSONB verisi \u00fczerinde indeksleme, t\u00fcm diziyi indekslemedi\u011fi i\u00e7in her zaman etkili olmayabilir.  Bu durumda, veritaban\u0131n\u0131z\u0131n yap\u0131s\u0131na g\u00f6re farkl\u0131 optimizasyon stratejileri d\u00fc\u015f\u00fcnmeniz gerekebilir.  \u00d6rne\u011fin, fiyat ge\u00e7mi\u015fini ayr\u0131 bir tabloda saklamak daha verimli olabilir.<\/p>\n<p><strong>PostgreSQL&#8217;de JSONB Dizisinin Son \u00d6\u011fesini Alma: \u0130leri Seviye Teknikler<\/strong><\/p>\n<p>\u0130leri seviye kullan\u0131m senaryolar\u0131nda, bo\u015f dizilerle veya null de\u011ferlerle kar\u015f\u0131la\u015fabilirsiniz.  Bu durumlar\u0131 ele almak i\u00e7in ko\u015fullu ifadeler kullanmal\u0131y\u0131z.<\/p>\n<pre class=\"language-sql\"><code>SELECT\n  urun_id,\n  CASE\n    WHEN jsonb_array_length(fiyat_gecmisi) &gt; 0 THEN (fiyat_gecmisi -&gt;&gt; (jsonb_array_length(fiyat_gecmisi) - 1))::numeric\n    ELSE NULL  -- Bo\u015f dizi durumunda NULL d\u00f6nd\u00fcr\u00fcr\n  END AS son_fiyat\nFROM urun_fiyatlari;<\/code><\/pre>\n<p>Bu sorgu, fiyat ge\u00e7mi\u015fi dizisi bo\u015fsa <code class=\"language-\">NULL<\/code> de\u011feri d\u00f6nd\u00fcr\u00fcr.  Ayr\u0131ca, performans analizi i\u00e7in <code class=\"language-\">EXPLAIN ANALYZE<\/code> komutunu kullanarak sorgunuzun performans\u0131n\u0131 inceleyebilirsiniz.  Karma\u015f\u0131k JSON yap\u0131lar\u0131nda, <code class=\"language-\">jsonb_path_query_first()<\/code> gibi daha geli\u015fmi\u015f fonksiyonlar\u0131 kullanarak hedef \u00f6\u011feye daha etkili bir \u015fekilde ula\u015fabilirsiniz.  Bu fonksiyon, JSONB verisi i\u00e7indeki belirli bir yolu takip ederek hedef \u00f6\u011feyi bulman\u0131za olanak tan\u0131r.  Fakat bu fonksiyonun kullan\u0131m\u0131 daha karma\u015f\u0131kt\u0131r ve performans analizi daha detayl\u0131 bir \u015fekilde yap\u0131lmal\u0131d\u0131r.  [Fatih Soysal&#8217;\u0131n PostgreSQL performans optimizasyonu hakk\u0131ndaki yaz\u0131lar\u0131ndan](https:\/\/fatihsoysal.com) faydalanabilirsiniz.<\/p>\n<p><strong>Ger\u00e7ek D\u00fcnya Senaryolar\u0131: Vaka Analizi<\/strong><\/p>\n<p><strong>Vaka 1: Sosyal Medya Analizi:<\/strong>  Bir sosyal medya uygulamas\u0131nda, her kullan\u0131c\u0131n\u0131n son 10 g\u00f6nderisini i\u00e7eren bir JSONB dizisi tutabilirsiniz.  Son g\u00f6nderiyi almak i\u00e7in yukar\u0131daki y\u00f6ntemleri kullanabilirsiniz.<\/p>\n<p><strong>Vaka 2: IoT Veri \u0130\u015fleme:<\/strong>  IoT cihazlar\u0131ndan gelen sens\u00f6r verilerini JSONB dizileri halinde saklayabilirsiniz.  Son \u00f6l\u00e7\u00fcm\u00fc almak i\u00e7in yine ayn\u0131 teknikleri uygulayabilirsiniz.<\/p>\n<p><strong>Vaka 3: Log Y\u00f6netimi:<\/strong>  Uygulama loglar\u0131n\u0131 JSONB dizileri olarak kaydedebilirsiniz.  Son hata logunu bulmak i\u00e7in bu y\u00f6ntemler kullan\u0131labilir.<\/p>\n<p><strong>Performans Optimizasyonu<\/strong><\/p>\n<p>JSONB verisi \u00fczerinde indeksleme, her zaman en iyi \u00e7\u00f6z\u00fcm olmayabilir.  Veri yap\u0131n\u0131z\u0131n ve sorgu gereksinimlerinin performans\u0131 nas\u0131l etkiledi\u011fini anlamak i\u00e7in sorgu planlay\u0131c\u0131s\u0131n\u0131 kullan\u0131n (<code class=\"language-\">EXPLAIN ANALYZE<\/code>).  Gerekirse, verinizi farkl\u0131 bir \u015fekilde modelleyerek performans\u0131 art\u0131rabilirsiniz.  \u00d6rne\u011fin,  JSONB dizisi yerine ayr\u0131 bir tablo kullanmak, \u00f6zellikle dizinin uzunlu\u011funun sabit olmad\u0131\u011f\u0131 durumlarda daha etkili olabilir.<\/p>\n<p><strong>Sonu\u00e7<\/strong><\/p>\n<p>PostgreSQL&#8217;de JSONB dizilerinin son \u00f6\u011fesini almak i\u00e7in \u00e7e\u015fitli y\u00f6ntemler mevcuttur.  Bu makalede, yeni ba\u015flayanlardan ileri seviye kullan\u0131c\u0131lara kadar herkesin anlayabilece\u011fi \u015fekilde bu y\u00f6ntemleri a\u00e7\u0131klad\u0131k.  Her zaman verilerinizin yap\u0131s\u0131n\u0131 ve sorgu gereksinimlerinizi g\u00f6z \u00f6n\u00fcnde bulundurarak en uygun y\u00f6ntemi se\u00e7meniz \u00f6nemlidir.  Performans optimizasyonu i\u00e7in sorgu planlay\u0131c\u0131s\u0131n\u0131 kullanmay\u0131 ve gerekti\u011finde veritaban\u0131 modelinizi yeniden tasarlamay\u0131 unutmay\u0131n.<\/p>\n<p><strong>S\u0131k\u00e7a Sorulan Sorular:<\/strong><\/p>\n<p>1. <strong>Bo\u015f bir JSONB dizisi i\u00e7in ne olur?<\/strong> Bo\u015f bir dizi i\u00e7in <code class=\"language-\">jsonb_array_length()<\/code> 0 d\u00f6nd\u00fcrecektir ve son \u00f6\u011fe eri\u015fimi bir hata \u00fcretmez, ancak <code class=\"language-\">NULL<\/code> veya varsay\u0131lan bir de\u011fer d\u00f6nd\u00fcrmek i\u00e7in ko\u015fullu bir ifade kullanman\u0131z \u00f6nerilir.<\/p>\n<p>2. <strong>JSON yerine JSONB kullanman\u0131n avantajlar\u0131 nelerdir?<\/strong> JSONB, ikili formatta oldu\u011fu i\u00e7in JSON&#8217;dan daha h\u0131zl\u0131 arama ve indeksleme sa\u011flar.  B\u00fcy\u00fck veri k\u00fcmeleri i\u00e7in JSONB tercih edilmelidir.<\/p>\n<p>3. <strong>JSONB dizilerinde indeksleme nas\u0131l yap\u0131l\u0131r?<\/strong>  JSONB dizileri \u00fczerinde indeksleme her zaman etkili olmayabilir.  Performans analizi yaparak en uygun indeksleme stratejisini belirlemeniz gerekir.<\/p>\n<p>4.  <strong>Daha karma\u015f\u0131k JSON yap\u0131lar\u0131nda son \u00f6\u011feye nas\u0131l ula\u015f\u0131r\u0131m?<\/strong> <code class=\"language-\">jsonb_path_query_first()<\/code> gibi geli\u015fmi\u015f fonksiyonlar\u0131 kullanabilirsiniz.<\/p>\n<p>5. <strong>Performans sorunlar\u0131yla kar\u015f\u0131la\u015ft\u0131\u011f\u0131mda ne yapmal\u0131y\u0131m?<\/strong>  <code class=\"language-\">EXPLAIN ANALYZE<\/code> komutunu kullanarak sorgu plan\u0131n\u0131 inceleyin ve veritaban\u0131 modelinizi yeniden tasarlamay\u0131 d\u00fc\u015f\u00fcn\u00fcn.<\/p>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"# PostgreSQL&#8217;de JSON Dizisinin Son \u00d6\u011fesini Alma PostgreSQL veritaban\u0131n\u0131zda JSON verisiyle \u00e7al\u0131\u015f\u0131yor ve bu verinin i\u00e7indeki JSON dizilerinin&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-25666","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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