{"id":32401,"date":"2025-10-21T08:41:15","date_gmt":"2025-10-21T05:41:15","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/?p=32401"},"modified":"2025-10-21T08:41:15","modified_gmt":"2025-10-21T05:41:15","slug":"jpa-annotasyonlari-ve-hibernate-annotasyonlari-derinlemesine-bir-karsilastirma-ve-uygulama-rehberi","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/jpa-annotasyonlari-ve-hibernate-annotasyonlari-derinlemesine-bir-karsilastirma-ve-uygulama-rehberi\/","title":{"rendered":"JPA Annotasyonlar\u0131 ve Hibernate Annotasyonlar\u0131: Derinlemesine Bir Kar\u015f\u0131la\u015ft\u0131rma ve Uygulama Rehberi"},"content":{"rendered":"<h2>JPA Annotasyonlar\u0131 ve Hibernate Annotasyonlar\u0131: Derinlemesine Bir Kar\u015f\u0131la\u015ft\u0131rma ve Uygulama Rehberi<\/h2>\n<p><body><\/p>\n<h2>Giri\u015f<\/h2>\n<p>G\u00fcn\u00fcm\u00fcz kurumsal Java uygulamalar\u0131n\u0131n bel kemi\u011fini olu\u015fturan veri kal\u0131c\u0131l\u0131\u011f\u0131 (persistence) katman\u0131, nesne y\u00f6nelimli programlama d\u00fcnyas\u0131 ile ili\u015fkisel veritabanlar\u0131 aras\u0131ndaki &#8220;empedans uyumsuzlu\u011funu&#8221; \u00e7\u00f6zmek i\u00e7in Nesne-\u0130li\u015fkisel E\u015fle\u015ftirme (Object-Relational Mapping &#8211; ORM) ara\u00e7lar\u0131na ihtiya\u00e7 duyar. ORM, geli\u015ftiricilerin veritaban\u0131 i\u015flemlerini do\u011frudan SQL sorgular\u0131 yazmak yerine Java nesneleri \u00fczerinde ger\u00e7ekle\u015ftirmesine olanak tan\u0131yarak geli\u015ftirme s\u00fcrecini h\u0131zland\u0131r\u0131r, kod okunabilirli\u011fini art\u0131r\u0131r ve bak\u0131m maliyetlerini d\u00fc\u015f\u00fcr\u00fcr. Bu alandaki en \u00f6nemli standartlardan biri Java Persistence API (JPA), en pop\u00fcler implementasyonlardan biri ise Hibernate&#8217;dir. Bu makale, JPA ve Hibernate aras\u0131ndaki ili\u015fkiyi, her iki taraf\u0131n sundu\u011fu annotasyonlar\u0131 ayr\u0131nt\u0131l\u0131 bir \u015fekilde inceleyecek, aralar\u0131ndaki farklar\u0131 ve hangi durumlarda hangi annotasyonlar\u0131n tercih edilmesi gerekti\u011fini \u00f6rneklerle a\u00e7\u0131klayacakt\u0131r.<\/p>\n<h2>JPA (Java Persistence API) Nedir?<\/h2>\n<p>JPA, Java EE (\u015fimdiki Jakarta EE) ve Java SE uygulamalar\u0131nda veri kal\u0131c\u0131l\u0131\u011f\u0131n\u0131 y\u00f6netmek i\u00e7in bir standart sa\u011flayan bir spesifikasyondur. Temel amac\u0131, Java nesnelerinin ili\u015fkisel bir veritaban\u0131na nas\u0131l e\u015flenece\u011fini, veritaban\u0131 i\u015flemlerinin nas\u0131l ger\u00e7ekle\u015ftirilece\u011fini ve sorgular\u0131n nas\u0131l yaz\u0131laca\u011f\u0131n\u0131 tan\u0131mlamakt\u0131r. JPA bir API olmas\u0131na ra\u011fmen, kendisi bir ORM arac\u0131 de\u011fildir; bunun yerine, ORM ara\u00e7lar\u0131n\u0131n bu spesifikasyonu uygulamas\u0131n\u0131 bekler. Bu sayede, geli\u015ftiriciler farkl\u0131 JPA sa\u011flay\u0131c\u0131lar\u0131 (Hibernate, EclipseLink, OpenJPA gibi) aras\u0131nda kolayca ge\u00e7i\u015f yapabilir, uygulamalar\u0131n\u0131n ta\u015f\u0131nabilirli\u011fini art\u0131rabilirler.<\/p>\n<p>JPA&#8217;n\u0131n kalbinde, veritaban\u0131 tablolar\u0131na e\u015flenen Java s\u0131n\u0131flar\u0131 olan &#8220;entity&#8221;ler bulunur. Entity&#8217;ler, <code>@Entity<\/code> annotasyonu ile i\u015faretlenir ve genellikle birincil anahtarlar\u0131 (<code>@Id<\/code>) ve di\u011fer s\u00fctunlar\u0131 (<code>@Column<\/code>) i\u00e7erir. JPA, bir &#8220;Persistence Context&#8221; (Kal\u0131c\u0131l\u0131k Ba\u011flam\u0131) arac\u0131l\u0131\u011f\u0131yla entity&#8217;lerin ya\u015fam d\u00f6ng\u00fcs\u00fcn\u00fc y\u00f6netir. <code>EntityManager<\/code> aray\u00fcz\u00fc, entity&#8217;leri kaydetme, g\u00fcncelleme, silme ve sorgulama gibi i\u015flemleri ger\u00e7ekle\u015ftirmek i\u00e7in kullan\u0131l\u0131r.<\/p>\n<h2>JPA Annotasyonlar\u0131<\/h2>\n<p>JPA, <code>javax.persistence<\/code> (veya Jakarta EE 9+ i\u00e7in <code>jakarta.persistence<\/code>) paketinde yer alan bir dizi annotasyon sunar. Bu annotasyonlar, Java s\u0131n\u0131flar\u0131n\u0131 ve alanlar\u0131n\u0131 veritaban\u0131 tablolar\u0131na ve s\u00fctunlar\u0131na e\u015flemek i\u00e7in kullan\u0131l\u0131r.<\/p>\n<h3>Temel Entity Annotasyonlar\u0131<\/h3>\n<p>Bu annotasyonlar, bir Java s\u0131n\u0131f\u0131n\u0131n nas\u0131l bir veritaban\u0131 tablosuna e\u015flenece\u011fini ve temel alanlar\u0131n nas\u0131l davranaca\u011f\u0131n\u0131 tan\u0131mlar.<\/p>\n<p>*   <code>@Entity<\/code>: Bir s\u0131n\u0131f\u0131n bir JPA entity&#8217;si oldu\u011funu ve kal\u0131c\u0131 hale getirilece\u011fini belirtir. Bu annotasyon, genellikle s\u0131n\u0131f\u0131n veritaban\u0131ndaki bir tabloya e\u015flenece\u011fi anlam\u0131na gelir.<\/p>\n<pre><code class=\"language-java\">import jakarta.persistence.Entity;\n\n    @Entity\n    public class Kullanici {\n        \/\/ ...\n    }<\/code><\/pre>\n<p>*   <code>@Table<\/code>: Entity&#8217;nin e\u015flenece\u011fi veritaban\u0131 tablosunun ad\u0131n\u0131 ve di\u011fer \u00f6zelliklerini (schema, catalog, uniqueConstraints, indexes) belirtir. E\u011fer belirtilmezse, s\u0131n\u0131f ad\u0131n\u0131 kullan\u0131r.<\/p>\n<pre><code class=\"language-java\">import jakarta.persistence.Table;\n\n    @Entity\n    @Table(name = \"APP_KULLANICILAR\", uniqueConstraints = @UniqueConstraint(columnNames = {\"email\"}))\n    public class Kullanici {\n        \/\/ ...\n    }<\/code><\/pre>\n<p>*   <code>@Id<\/code>: Bir entity&#8217;nin birincil anahtar\u0131n\u0131 belirten alan\u0131 i\u015faretler. Her entity&#8217;nin bir <code>@Id<\/code> alan\u0131 olmal\u0131d\u0131r.<\/p>\n<pre><code class=\"language-java\">import jakarta.persistence.Id;\n\n    @Id\n    private Long id;<\/code><\/pre>\n<p>*   <code>@GeneratedValue<\/code>: Birincil anahtar de\u011ferinin nas\u0131l olu\u015fturulaca\u011f\u0131n\u0131 belirtir. Stratejiler \u015funlard\u0131r:<br \/>\n    *   <code>AUTO<\/code>: Sa\u011flay\u0131c\u0131n\u0131n uygun bir strateji se\u00e7mesini sa\u011flar (varsay\u0131lan).<br \/>\n    *   <code>IDENTITY<\/code>: Veritaban\u0131n\u0131n kimlik s\u00fctununu kullan\u0131r (\u00f6rn: MySQL&#8217;de <code>AUTO_INCREMENT<\/code>).<br \/>\n    *   <code>SEQUENCE<\/code>: Veritaban\u0131 dizilerini kullan\u0131r.<br \/>\n    *   <code>TABLE<\/code>: Ayr\u0131 bir veritaban\u0131 tablosu kullanarak kimlik de\u011ferleri olu\u015fturur.<\/p>\n<pre><code class=\"language-java\">import jakarta.persistence.GeneratedValue;\n    import jakarta.persistence.GenerationType;\n\n    @Id\n    @GeneratedValue(strategy = GenerationType.IDENTITY)\n    private Long id;<\/code><\/pre>\n<p>*   <code>@Column<\/code>: Bir alan\u0131n veritaban\u0131 s\u00fctunuyla nas\u0131l e\u015fle\u015fti\u011fini belirtir. <code>name<\/code>, <code>nullable<\/code>, <code>unique<\/code>, <code>length<\/code>, <code>precision<\/code>, <code>scale<\/code> gibi \u00f6zellikler ayarlanabilir.<\/p>\n<pre><code class=\"language-java\">import jakarta.persistence.Column;\n\n    @Column(name = \"kullanici_adi\", nullable = false, unique = true, length = 50)\n    private String username;<\/code><\/pre>\n<p>*   <code>@Transient<\/code>: Bir alan\u0131n kal\u0131c\u0131 hale getirilmemesi gerekti\u011fini belirtir. Bu alan veritaban\u0131nda bir s\u00fctun olarak g\u00f6r\u00fcnmez.<\/p>\n<pre><code class=\"language-java\">import jakarta.persistence.Transient;\n\n    @Transient\n    private String geciciVeri;<\/code><\/pre>\n<p>*   <code>@Temporal<\/code>: <code>java.util.Date<\/code> veya <code>java.util.Calendar<\/code> t\u00fcr\u00fcndeki alanlar\u0131n veritaban\u0131nda nas\u0131l saklanaca\u011f\u0131n\u0131 belirtir (<code>DATE<\/code>, <code>TIME<\/code>, <code>TIMESTAMP<\/code>).<\/p>\n<pre><code class=\"language-java\">import jakarta.persistence.Temporal;\n    import jakarta.persistence.TemporalType;\n\n    @Temporal(TemporalType.TIMESTAMP)\n    private Date olusturmaTarihi;<\/code><\/pre>\n<p>*   <code>@Enumerated<\/code>: Enum t\u00fcr\u00fcndeki alanlar\u0131n veritaban\u0131nda nas\u0131l saklanaca\u011f\u0131n\u0131 belirtir (<code>ORDINAL<\/code> &#8211; say\u0131sal indeks, <code>STRING<\/code> &#8211; enum ad\u0131). <code>STRING<\/code> genellikle daha g\u00fcvenli ve okunabilirdir.<\/p>\n<pre><code class=\"language-java\">import jakarta.persistence.Enumerated;\n    import jakarta.persistence.EnumType;\n\n    public enum Rol { ADMIN, KULLANICI }\n\n    @Enumerated(EnumType.STRING)\n    private Rol rol;<\/code><\/pre>\n<h3>\u0130li\u015fki (Relationship) Annotasyonlar\u0131<\/h3>\n<p>JPA, entity&#8217;ler aras\u0131ndaki ili\u015fkileri modellemek i\u00e7in bir dizi annotasyon sunar:<\/p>\n<p>*   <code>@OneToOne<\/code>: \u0130ki entity aras\u0131nda birebir ili\u015fkiyi belirtir.<br \/>\n*   <code>@OneToMany<\/code>: Bir entity&#8217;nin birden \u00e7ok ba\u015fka entity ile ili\u015fkili oldu\u011funu belirtir.<br \/>\n*   <code>@ManyToOne<\/code>: Birden \u00e7ok entity&#8217;nin tek bir ba\u015fka entity ile ili\u015fkili oldu\u011funu belirtir.<br \/>\n*   <code>@ManyToMany<\/code>: \u0130ki entity aras\u0131nda \u00e7oktan \u00e7o\u011fa ili\u015fkiyi belirtir.<\/p>\n<p>Bu ili\u015fki annotasyonlar\u0131 genellikle <code>fetch<\/code> (y\u00fckleme stratejisi: <code>LAZY<\/code> veya <code>EAGER<\/code>) ve <code>cascade<\/code> (i\u015flem yay\u0131l\u0131m\u0131: <code>ALL<\/code>, <code>PERSIST<\/code>, <code>MERGE<\/code>, <code>REMOVE<\/code>, <code>REFRESH<\/code>, <code>DETACH<\/code>) gibi \u00f6zniteliklere sahiptir.<\/p>\n<p>*   <code>@JoinColumn<\/code>: \u0130li\u015fkinin sahibi taraf\u0131nda yabanc\u0131 anahtar s\u00fctununu belirtir.<\/p>\n<pre><code class=\"language-java\">import jakarta.persistence.ManyToOne;\n    import jakarta.persistence.JoinColumn;\n\n    @ManyToOne\n    @JoinColumn(name = \"kategori_id\") \/\/ Urun tablosundaki yabanc\u0131 anahtar s\u00fctunu\n    private Kategori kategori;<\/code><\/pre>\n<p>*   <code>@JoinTable<\/code>: \u00c7oktan \u00e7o\u011fa ili\u015fkilerde veya \u00f6zel bir ara tabloya ihtiya\u00e7 duyuldu\u011funda, bu ara tablonun ad\u0131n\u0131 ve birle\u015ftirme s\u00fctunlar\u0131n\u0131 belirtir.<\/p>\n<pre><code class=\"language-java\">import jakarta.persistence.ManyToMany;\n    import jakarta.persistence.JoinTable;\n    import jakarta.persistence.JoinColumn;\n\n    @ManyToMany\n    @JoinTable(\n        name = \"KULLANICI_GRUP\",\n        joinColumns = @JoinColumn(name = \"kullanici_id\"),\n        inverseJoinColumns = @JoinColumn(name = \"grup_id\")\n    )\n    private Set<Grup> gruplar = new HashSet<>();<\/code><\/pre>\n<p>*   <code>mappedBy<\/code>: \u0130li\u015fkinin sahibi olmayan taraf\u0131nda kullan\u0131l\u0131r ve ili\u015fkinin hangi alandan y\u00f6netildi\u011fini belirtir. Bu, \u00e7ift y\u00f6nl\u00fc ili\u015fkilerde d\u00f6ng\u00fcsel ba\u011f\u0131ml\u0131l\u0131klar\u0131 \u00f6nler.<\/p>\n<pre><code class=\"language-java\">import jakarta.persistence.OneToMany;\n\n    @OneToMany(mappedBy = \"kategori\", cascade = CascadeType.ALL, fetch = FetchType.LAZY)\n    private Set<Urun> urunler = new HashSet<>();<\/code><\/pre>\n<h3>Di\u011fer Faydal\u0131 JPA Annotasyonlar\u0131<\/h3>\n<p>*   <code>@Embedded<\/code>, <code>@Embeddable<\/code>: Bir nesnenin, ba\u015fka bir entity&#8217;nin bir bile\u015feni olarak depolanmas\u0131n\u0131 sa\u011flar. <code>@Embeddable<\/code> ile i\u015faretlenmi\u015f bir s\u0131n\u0131f, <code>@Embedded<\/code> ile bir entity&#8217;nin i\u00e7ine g\u00f6m\u00fclebilir.<\/p>\n<pre><code class=\"language-java\">import jakarta.persistence.Embeddable;\n    import jakarta.persistence.Embedded;\n\n    @Embeddable\n    public class Adres {\n        private String sokak;\n        private String sehir;\n    }\n\n    @Entity\n    public class Musteri {\n        @Embedded\n        private Adres adres;\n    }<\/code><\/pre>\n<p>*   <code>@Version<\/code>: \u0130yimser kilitlenme (optimistic locking) i\u00e7in kullan\u0131l\u0131r. Entity g\u00fcncellendi\u011finde de\u011feri otomatik olarak art\u0131r\u0131lan bir versiyon s\u00fctununu i\u015faretler. Bu, e\u015fzamanl\u0131 g\u00fcncellemelerde veri tutars\u0131zl\u0131\u011f\u0131n\u0131 \u00f6nler.<\/p>\n<pre><code class=\"language-java\">import jakarta.persistence.Version;\n\n    @Version\n    private int version;<\/code><\/pre>\n<p>*   <code>@NamedQueries<\/code>, <code>@NamedQuery<\/code>: \u00d6nceden tan\u0131mlanm\u0131\u015f, parametreli sorgular\u0131 entity \u00fczerinde tan\u0131mlamak i\u00e7in kullan\u0131l\u0131r. Bu, sorgular\u0131n merkezi bir yerde y\u00f6netilmesini ve yeniden kullan\u0131labilirli\u011fini art\u0131r\u0131r.<\/p>\n<pre><code class=\"language-java\">import jakarta.persistence.NamedQuery;\n    import jakarta.persistence.NamedQueries;\n\n    @Entity\n    @NamedQueries({\n        @NamedQuery(name = \"Kullanici.findAll\", query = \"SELECT k FROM Kullanici k\"),\n        @NamedQuery(name = \"Kullanici.findByUsername\", query = \"SELECT k FROM Kullanici k WHERE k.username = :username\")\n    })\n    public class Kullanici {\n        \/\/ ...\n    }<\/code><\/pre>\n<p>*   <code>@PrePersist<\/code>, <code>@PostPersist<\/code>, <code>@PreUpdate<\/code>, <code>@PostUpdate<\/code>, <code>@PreRemove<\/code>, <code>@PostRemove<\/code>, <code>@PostLoad<\/code>: Entity ya\u015fam d\u00f6ng\u00fcs\u00fc olaylar\u0131na tepki vermek i\u00e7in kullan\u0131lan geri \u00e7a\u011f\u0131rma (callback) annotasyonlar\u0131d\u0131r. \u00d6rne\u011fin, bir entity kaydedilmeden \u00f6nce (<code>@PrePersist<\/code>) veya y\u00fcklendikten sonra (<code>@PostLoad<\/code>) belirli bir metodu \u00e7al\u0131\u015ft\u0131rmak i\u00e7in kullan\u0131l\u0131rlar.<\/p>\n<pre><code class=\"language-java\">import jakarta.persistence.PrePersist;\n    import java.util.Date;\n\n    @Entity\n    public class Urun {\n        \/\/ ...\n        private Date olusturmaTarihi;\n\n        @PrePersist\n        protected void onCreate() {\n            olusturmaTarihi = new Date();\n        }\n    }<\/code><\/pre>\n<h2>Hibernate Nedir?<\/h2>\n<p>Hibernate, Java i\u00e7in \u00f6nde gelen a\u00e7\u0131k kaynakl\u0131 bir ORM arac\u0131d\u0131r ve ayn\u0131 zamanda JPA spesifikasyonunun en yayg\u0131n kullan\u0131lan implementasyonudur. JPA&#8217;dan \u00f6nce var olan Hibernate, JPA&#8217;n\u0131n tasar\u0131m\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde etkilemi\u015ftir. Hibernate, JPA&#8217;n\u0131n sundu\u011fu temel i\u015flevselli\u011fi sa\u011flaman\u0131n yan\u0131 s\u0131ra, daha geli\u015fmi\u015f \u00f6zellikler ve optimizasyonlar sunarak standart JPA&#8217;n\u0131n \u00f6tesine ge\u00e7er.<\/p>\n<p>Hibernate&#8217;in temel \u00f6zellikleri aras\u0131nda g\u00fc\u00e7l\u00fc bir \u00f6nbellekleme mekanizmas\u0131 (birinci ve ikinci seviye \u00f6nbellek), zengin bir sorgu dili olan HQL (Hibernate Query Language), dinamik sorgular i\u00e7in Criteria API ve bir\u00e7ok performans optimizasyonu bulunur. Bir JPA sa\u011flay\u0131c\u0131s\u0131 olarak Hibernate, <code>EntityManager<\/code> aray\u00fcz\u00fcn\u00fc ve JPA annotasyonlar\u0131n\u0131 kullanarak entity&#8217;lerinizi y\u00f6netmenize olanak tan\u0131r. Ancak, Hibernate&#8217;in kendi \u00f6zel annotasyon setini kullanarak JPA&#8217;n\u0131n kapsamad\u0131\u011f\u0131 veya daha ince ayar gerektiren durumlar i\u00e7in ek yetenekler sunar.<\/p>\n<h2>Hibernate Annotasyonlar\u0131<\/h2>\n<p>Hibernate, <code>org.hibernate.annotations<\/code> paketinde yer alan kendi \u00f6zel annotasyon setini sunar. Bu annotasyonlar, standart JPA annotasyonlar\u0131n\u0131n sa\u011flamad\u0131\u011f\u0131 veya daha derinlemesine kontrol gerektiren senaryolarda kullan\u0131l\u0131r. Hibernate annotasyonlar\u0131, Hibernate&#8217;in geli\u015fmi\u015f \u00f6zelliklerini do\u011frudan entity s\u0131n\u0131flar\u0131n\u0131za entegre etmenizi sa\u011flar. Ancak, bu annotasyonlar\u0131 kullanmak uygulaman\u0131z\u0131 Hibernate&#8217;e ba\u011f\u0131ml\u0131 hale getirir ve ta\u015f\u0131nabilirli\u011fini azalt\u0131r.<\/p>\n<h3>JPA Annotasyonlar\u0131na Ek Olarak Gelenler<\/h3>\n<p>*   <code>@Immutable<\/code>: Bir entity&#8217;nin olu\u015fturulduktan sonra de\u011fi\u015ftirilemez oldu\u011funu belirtir. Bu, Hibernate&#8217;in \u00f6nbellekleme ve oturum y\u00f6netimi optimizasyonlar\u0131n\u0131 art\u0131rabilir.<\/p>\n<pre><code class=\"language-java\">import org.hibernate.annotations.Immutable;\n\n    @Entity\n    @Immutable\n    public class LogKaydi {\n        \/\/ ...\n    }<\/code><\/pre>\n<p>*   <code>@Cache<\/code>, <code>@CacheConcurrencyStrategy<\/code>: \u0130kinci seviye \u00f6nbellekleme stratejilerini (\u00f6rn: <code>READ_ONLY<\/code>, <code>NONSTRICT_READ_WRITE<\/code>, <code>READ_WRITE<\/code>, <code>TRANSACTIONAL<\/code>) ve \u00f6nbellek b\u00f6lgesini yap\u0131land\u0131rmak i\u00e7in kullan\u0131l\u0131r. JPA&#8217;n\u0131n do\u011frudan bir \u00f6nbellek annotasyonu yoktur, ancak sa\u011flay\u0131c\u0131ya \u00f6zel yap\u0131land\u0131rma se\u00e7enekleri sunar.<\/p>\n<pre><code class=\"language-java\">import org.hibernate.annotations.Cache;\n    import org.hibernate.annotations.CacheConcurrencyStrategy;\n\n    @Entity\n    @Cache(usage = CacheConcurrencyStrategy.READ_WRITE)\n    public class Urun {\n        \/\/ ...\n    }<\/code><\/pre>\n<p>*   <code>@BatchSize<\/code>: \u0130li\u015fkili koleksiyonlar\u0131n veya entity&#8217;lerin toplu y\u00fcklenmesi (batch loading) i\u00e7in kullan\u0131l\u0131r. Bu, N+1 sorgu sorununu hafifletmeye yard\u0131mc\u0131 olabilir.<\/p>\n<pre><code class=\"language-java\">import org.hibernate.annotations.BatchSize;\n\n    @OneToMany(mappedBy = \"kategori\")\n    @BatchSize(size = 10) \/\/ 10 \u00fcr\u00fcn\u00fc ayn\u0131 anda y\u00fckle\n    private Set<Urun> urunler = new HashSet<>();<\/code><\/pre>\n<p>*   <code>@Formula<\/code>: Veritaban\u0131 taraf\u0131nda hesaplanan bir de\u011feri bir entity \u00f6zelli\u011fine e\u015flemek i\u00e7in kullan\u0131l\u0131r. SQL ifadeleriyle do\u011frudan \u00e7al\u0131\u015f\u0131r.<\/p>\n<pre><code class=\"language-java\">import org.hibernate.annotations.Formula;\n\n    @Entity\n    public class Siparis {\n        \/\/ ...\n        private double miktar;\n        private double birimFiyat;\n\n        @Formula(\"miktar * birim_fiyat\")\n        private double toplamTutar;\n    }<\/code><\/pre>\n<p>*   <code>@Type<\/code>: Alanlar i\u00e7in \u00f6zel Hibernate t\u00fcrlerini (custom types) belirtmek i\u00e7in kullan\u0131l\u0131r. Bu, JPA&#8217;n\u0131n desteklemedi\u011fi karma\u015f\u0131k veri tiplerini e\u015flemek i\u00e7in faydal\u0131d\u0131r.<\/p>\n<pre><code class=\"language-java\">import org.hibernate.annotations.Type;\n\n    @Type(JsonType.class) \/\/ Varsay\u0131msal bir JSON t\u00fcr\u00fc\n    private MyCustomJsonType jsonVerisi;<\/code><\/pre>\n<p>*   <code>@Where<\/code>: Bir koleksiyon veya entity sorgulan\u0131rken uygulanacak ek bir SQL WHERE ko\u015fulu belirtir. Genellikle &#8220;soft delete&#8221; (mant\u0131ksal silme) gibi durumlar i\u00e7in kullan\u0131l\u0131r.<\/p>\n<pre><code class=\"language-java\">import org.hibernate.annotations.Where;\n\n    @Entity\n    @Where(clause = \"aktif = true\")\n    public class Kullanici {\n        private boolean aktif;\n        \/\/ ...\n    }<\/code><\/pre>\n<p>*   <code>@FilterDef<\/code>, <code>@Filter<\/code>: Dinamik filtreleme mekanizmas\u0131 sunar. Bir entity \u00fczerinde tan\u0131mlanm\u0131\u015f filtreleri \u00e7al\u0131\u015fma zaman\u0131nda etkinle\u015ftirip devre d\u0131\u015f\u0131 b\u0131rakmaya olanak tan\u0131r.<\/p>\n<pre><code class=\"language-java\">import org.hibernate.annotations.FilterDef;\n    import org.hibernate.annotations.Filter;\n    import org.hibernate.annotations.ParamDef;\n\n    @Entity\n    @FilterDef(name = \"byBolge\", parameters = @ParamDef(name = \"bolgeId\", type = Integer.class))\n    @Filter(name = \"byBolge\", condition = \"bolge_id = :bolgeId\")\n    public class Magaza {\n        private Integer bolgeId;\n        \/\/ ...\n    }<\/code><\/pre>\n<p>*   <code>@Fetch<\/code>: \u0130li\u015fki y\u00fckleme stratejisi i\u00e7in JPA&#8217;n\u0131n <code>fetch<\/code> \u00f6zniteli\u011finden daha fazla kontrol sa\u011flar. <code>FetchMode.JOIN<\/code> (sol d\u0131\u015f birle\u015ftirme), <code>FetchMode.SELECT<\/code> (ayr\u0131 bir sorgu) veya <code>FetchMode.SUBSELECT<\/code> (alt sorgu) gibi se\u00e7enekler sunar.<\/p>\n<pre><code class=\"language-java\">import org.hibernate.annotations.Fetch;\n    import org.hibernate.annotations.FetchMode;\n\n    @OneToMany(mappedBy = \"kategori\")\n    @Fetch(FetchMode.SUBSELECT)\n    private Set<Urun> urunler = new HashSet<>();<\/code><\/pre>\n<p>*   <code>@NaturalId<\/code>: \u0130\u015f modelinde do\u011fal birincil anahtar olarak kullan\u0131lan bir veya daha fazla alan\u0131 i\u015faretler. Bu alanlar benzersizdir ve entity&#8217;yi tan\u0131mlamak i\u00e7in kullan\u0131labilir, ancak veritaban\u0131 taraf\u0131ndan \u00fcretilen sentetik <code>@Id<\/code> ile farkl\u0131d\u0131r.<\/p>\n<pre><code class=\"language-java\">import org.hibernate.annotations.NaturalId;\n\n    @Entity\n    public class Ulke {\n        @Id\n        private Long id;\n\n        @NaturalId\n        @Column(unique = true)\n        private String kod; \/\/ \u00d6rne\u011fin \"TR\", \"US\"\n        \/\/ ...\n    }<\/code><\/pre>\n<p>*   <code>@OptimisticLocking<\/code>: JPA&#8217;n\u0131n <code>@Version<\/code> annotasyonundan daha fazla iyimser kilitlenme stratejisi sunar (<code>VERSION<\/code>, <code>ALL<\/code>, <code>DIRTY<\/code>, <code>NONE<\/code>).<br \/>\n*   <code>@LazyCollection<\/code>, <code>@LazyToOne<\/code>: Koleksiyonlar\u0131n veya birebir ili\u015fkilerin tembel y\u00fckleme davran\u0131\u015f\u0131n\u0131 daha ince ayarlamak i\u00e7in kullan\u0131l\u0131r. <code>EXTRA<\/code> gibi se\u00e7enekler sunarak performans optimizasyonlar\u0131na olanak tan\u0131r.<br \/>\n*   <code>@Index<\/code>, <code>@UniqueConstraint<\/code>: JPA&#8217;n\u0131n <code>@Table<\/code> annotasyonu i\u00e7inde <code>uniqueConstraints<\/code> ve <code>indexes<\/code> tan\u0131mlanabilse de, Hibernate kendi <code>@Index<\/code> ve <code>@UniqueConstraint<\/code> annotasyonlar\u0131n\u0131 sunar. Bunlar genellikle daha esnek veya belirli durumlarda tercih edilebilir.<\/p>\n<h2>JPA ve Hibernate Annotasyonlar\u0131 Aras\u0131ndaki \u0130li\u015fki ve Farklar<\/h2>\n<p>JPA ve Hibernate annotasyonlar\u0131 aras\u0131ndaki ili\u015fkiyi ve farklar\u0131 anlamak, do\u011fru arac\u0131 do\u011fru senaryoda kullanmak i\u00e7in kritik \u00f6neme sahiptir.<\/p>\n<h3>\u0130li\u015fki<\/h3>\n<p>*   <strong>JPA Bir Standart, Hibernate Bir Implementasyondur<\/strong>: En temel ili\u015fki budur. Hibernate, JPA spesifikasyonunu uygulayan bir sa\u011flay\u0131c\u0131d\u0131r. Bu nedenle, Hibernate&#8217;i kullan\u0131rken t\u00fcm standart JPA annotasyonlar\u0131n\u0131 kullanabilirsiniz.<br \/>\n*   <strong>JPA Annotasyonlar\u0131 Ta\u015f\u0131nabilirlik Sa\u011flar<\/strong>: Yaln\u0131zca JPA annotasyonlar\u0131n\u0131 kullanarak yazd\u0131\u011f\u0131n\u0131z bir uygulama, Hibernate yerine EclipseLink veya OpenJPA gibi ba\u015fka bir JPA sa\u011flay\u0131c\u0131s\u0131yla \u00e7al\u0131\u015fabilir. Bu, uygulaman\u0131z\u0131n gelecekteki de\u011fi\u015fikliklere kar\u015f\u0131 daha diren\u00e7li olmas\u0131n\u0131 sa\u011flar.<br \/>\n*   <strong>Hibernate Annotasyonlar\u0131 JPA&#8217;y\u0131 Geni\u015fletir<\/strong>: Hibernate annotasyonlar\u0131, JPA&#8217;n\u0131n sa\u011flamad\u0131\u011f\u0131 veya daha geli\u015fmi\u015f kontrol gerektiren \u00f6zellikler i\u00e7in ek yetenekler sunar. Bunlar, Hibernate&#8217;in kendi i\u00e7 mimarisine \u00f6zg\u00fc optimizasyonlar ve \u00f6zelliklerdir.<\/p>\n<h3>Farklar<\/h3>\n<p>*   <strong>Standardizasyon vs. Sat\u0131c\u0131ya \u00d6zg\u00fcl\u00fck<\/strong>: JPA annotasyonlar\u0131 standartt\u0131r ve t\u00fcm JPA sa\u011flay\u0131c\u0131lar\u0131 taraf\u0131ndan desteklenmelidir. Hibernate annotasyonlar\u0131 ise Hibernate&#8217;e \u00f6zg\u00fcd\u00fcr ve ba\u015fka bir JPA sa\u011flay\u0131c\u0131s\u0131nda \u00e7al\u0131\u015fmaz.<br \/>\n*   <strong>Ta\u015f\u0131nabilirlik<\/strong>: JPA annotasyonlar\u0131 ile yaz\u0131lan kod ta\u015f\u0131nabilirdir. Hibernate annotasyonlar\u0131 ile yaz\u0131lan kod, Hibernate&#8217;e ba\u011f\u0131ml\u0131d\u0131r.<br \/>\n*   <strong>Kapsam<\/strong>: JPA, nesne-ili\u015fkisel e\u015fle\u015ftirmenin temelini ve en yayg\u0131n senaryolar\u0131n\u0131 kapsar. Hibernate, bu temel \u00fczerine in\u015fa eder ve \u00f6nbellekleme, toplu i\u015flemler, \u00f6zel t\u00fcrler, geli\u015fmi\u015f sorgulama gibi daha geli\u015fmi\u015f ve performans odakl\u0131 \u00f6zellikler sunar.<br \/>\n*   <strong>Paketler<\/strong>: JPA annotasyonlar\u0131 <code>jakarta.persistence<\/code> (veya eski Java EE s\u00fcr\u00fcmlerinde <code>javax.persistence<\/code>) paketinde yer al\u0131rken, Hibernate annotasyonlar\u0131 <code>org.hibernate.annotations<\/code> paketinde bulunur.<\/p>\n<p><strong>\u00d6rnek Farkl\u0131l\u0131klar:<\/strong><\/p>\n<p>*   <strong>Benzersiz K\u0131s\u0131tlamalar ve \u0130ndeksler<\/strong>: JPA&#8217;da <code>@Table(uniqueConstraints = ...)<\/code> veya <code>@Column(unique = true)<\/code> kullan\u0131rs\u0131n\u0131z. Hibernate&#8217;de ise <code>@UniqueConstraint<\/code> ve <code>@Index<\/code> gibi daha esnek ve do\u011frudan veritaban\u0131 indekslerini tan\u0131mlayan annotasyonlar bulunur.<br \/>\n*   <strong>Y\u00fckleme Stratejileri<\/strong>: JPA&#8217;n\u0131n ili\u015fkiler i\u00e7in <code>fetch = FetchType.LAZY<\/code> veya <code>EAGER<\/code> \u00f6zniteli\u011fi vard\u0131r. Hibernate, <code>@Fetch(FetchMode.JOIN\/SELECT\/SUBSELECT)<\/code> ile daha ayr\u0131nt\u0131l\u0131 kontrol sa\u011flar.<br \/>\n*   <strong>ID \u00dcretimi<\/strong>: JPA&#8217;n\u0131n <code>@GeneratedValue<\/code> stratejileri varken, Hibernate&#8217;in <code>@GenericGenerator<\/code> gibi daha \u00f6zelle\u015ftirilebilir jenerat\u00f6rleri vard\u0131r.<br \/>\n*   <strong>\u00d6nbellekleme<\/strong>: JPA&#8217;n\u0131n do\u011frudan bir \u00f6nbellek annotasyonu yoktur, \u00f6nbellek yap\u0131land\u0131rmas\u0131 sa\u011flay\u0131c\u0131ya \u00f6zel XML veya \u00f6zellikler \u00fczerinden yap\u0131l\u0131r. Hibernate, <code>@Cache<\/code> annotasyonu ile entity baz\u0131nda \u00f6nbellek stratejilerini do\u011frudan tan\u0131mlaman\u0131za olanak tan\u0131r.<br \/>\n*   <strong>Hesaplanm\u0131\u015f Alanlar<\/strong>: JPA&#8217;da do\u011frudan bir kar\u015f\u0131l\u0131\u011f\u0131 olmayan <code>@Formula<\/code> gibi annotasyonlar, Hibernate&#8217;in g\u00fc\u00e7l\u00fc \u00f6zelliklerindendir.<\/p>\n<h2>Ne Zaman Hangi Annotasyonu Kullanmal\u0131?<\/h2>\n<p>Bu, her geli\u015ftiricinin kar\u015f\u0131la\u015ft\u0131\u011f\u0131 \u00f6nemli bir sorudur. \u0130\u015fte genel bir k\u0131lavuz:<\/p>\n<p>*   <strong>\u00d6ncelik JPA&#8217;ya Verin<\/strong>: Uygulaman\u0131z\u0131n ta\u015f\u0131nabilirli\u011fini en \u00fcst d\u00fczeyde tutmak i\u00e7in her zaman \u00f6nce JPA standart annotasyonlar\u0131n\u0131 kullanmaya \u00e7al\u0131\u015f\u0131n. Bir \u00f6zelli\u011fe ihtiyac\u0131n\u0131z oldu\u011funda, \u00f6nce JPA&#8217;n\u0131n bunu nas\u0131l ele ald\u0131\u011f\u0131n\u0131 ara\u015ft\u0131r\u0131n. Bu, kodunuzu farkl\u0131 bir JPA sa\u011flay\u0131c\u0131s\u0131na ge\u00e7i\u015f yapman\u0131z gerekti\u011finde b\u00fcy\u00fck \u00f6l\u00e7\u00fcde basitle\u015ftirir.<br \/>\n*   <strong>Hibernate&#8217;in G\u00fcc\u00fcnden Faydalan\u0131n<\/strong>: E\u011fer JPA&#8217;n\u0131n sundu\u011fu \u00f6zellikler yetersiz kal\u0131yorsa veya belirli bir performans optimizasyonu ya da \u00f6zel bir davran\u0131\u015f gerekiyorsa, o zaman Hibernate&#8217;in \u00f6zel annotasyonlar\u0131na ba\u015fvurun. \u00d6rne\u011fin:<br \/>\n    *   Geli\u015fmi\u015f ikinci seviye \u00f6nbellekleme stratejileri gerekti\u011finde (<code>@Cache<\/code>).<br \/>\n    *   Veritaban\u0131 taraf\u0131nda hesaplanan bir alan\u0131 e\u015flemek istedi\u011finizde (<code>@Formula<\/code>).<br \/>\n    *   Koleksiyonlar\u0131n veya ili\u015fkilerin y\u00fckleme davran\u0131\u015f\u0131n\u0131 ince ayarlamak istedi\u011finizde (<code>@BatchSize<\/code>, <code>@Fetch<\/code>, <code>@LazyCollection<\/code>).<br \/>\n    *   Soft delete gibi durumlarda dinamik filtreleme gerekti\u011finde (<code>@Where<\/code>, <code>@Filter<\/code>).<br \/>\n    *   JPA&#8217;n\u0131n desteklemedi\u011fi \u00f6zel bir veri t\u00fcr\u00fcn\u00fc e\u015flemek istedi\u011finizde (<code>@Type<\/code>).<br \/>\n*   <strong>Performans ve \u00d6zelle\u015ftirme<\/strong>: Performans kritik uygulamalarda veya veritaban\u0131 ile daha derin entegrasyon gerekti\u011finde, Hibernate annotasyonlar\u0131 vazge\u00e7ilmez olabilir. Ancak, bu karar\u0131n uygulaman\u0131n ta\u015f\u0131nabilirlik maliyetiyle dikkatlice tart\u0131lmas\u0131 gerekir.<br \/>\n*   <strong>Ekosistem ve Topluluk<\/strong>: Hibernate, geni\u015f bir toplulu\u011fa ve zengin belgelere sahiptir. Bu, \u00f6zel durumlar i\u00e7in \u00e7\u00f6z\u00fcm bulmay\u0131 kolayla\u015ft\u0131r\u0131r ve kar\u015f\u0131la\u015f\u0131lan sorunlarda destek bulma olas\u0131l\u0131\u011f\u0131n\u0131 art\u0131r\u0131r.<\/p>\n<h2>Pratik \u00d6rnekler<\/h2>\n<p>\u015eimdi, JPA ve Hibernate annotasyonlar\u0131n\u0131n birlikte veya ayr\u0131 ayr\u0131 nas\u0131l kullan\u0131labilece\u011fini g\u00f6steren baz\u0131 pratik \u00f6rneklere bakal\u0131m.<\/p>\n<h3>Basit Bir JPA Entity<\/h3>\n<p>Bir <code>Kullanici<\/code> entity&#8217;si tan\u0131mlayal\u0131m. Tamamen JPA annotasyonlar\u0131 kullan\u0131yoruz.<\/p>\n<pre><code class=\"language-java\">import jakarta.persistence.Column;\nimport jakarta.persistence.Entity;\nimport jakarta.persistence.GeneratedValue;\nimport jakarta.persistence.GenerationType;\nimport jakarta.persistence.Id;\nimport jakarta.persistence.Table;\nimport jakarta.persistence.UniqueConstraint;\nimport java.util.Date;\n\n@Entity\n@Table(name = \"KULLANICILAR\", uniqueConstraints = {\n    @UniqueConstraint(columnNames = \"email\")\n})\npublic class Kullanici {\n\n    @Id\n    @GeneratedValue(strategy = GenerationType.IDENTITY)\n    private Long id;\n\n    @Column(name = \"kullanici_adi\", nullable = false, unique = true, length = 50)\n    private String username;\n\n    @Column(nullable = false, length = 100)\n    private String email;\n\n    @Column(name = \"sifre\", nullable = false, length = 255)\n    private String password;\n\n    @Column(name = \"kayit_tarihi\", updatable = false)\n    private Date registrationDate;\n\n    \/\/ Constructors, getters, setters\n    public Kullanici() {\n        this.registrationDate = new Date(); \/\/ Varsay\u0131lan de\u011fer\n    }\n\n    public Kullanici(String username, String email, String password) {\n        this();\n        this.username = username;\n        this.email = email;\n        this.password = password;\n    }\n\n    public Long getId() { return id; }\n    public void setId(Long id) { this.id = id; }\n    public String getUsername() { return username; }\n    public void setUsername(String username) { this.username = username; }\n    public String getEmail() { return email; }\n    public void setEmail(String email) { this.email = email; }\n    public String getPassword() { return password; }\n    public void setPassword(String password) { this.password = password; }\n    public Date getRegistrationDate() { return registrationDate; }\n    public void setRegistrationDate(Date registrationDate) { this.registrationDate = registrationDate; }\n\n    @Override\n    public String toString() {\n        return \"Kullanici{\" +\n               \"id=\" + id +\n               \", username='\" + username + '\\'' +\n               \", email='\" + email + '\\'' +\n               '}';\n    }\n}<\/code><\/pre>\n<p>Bu \u00f6rnek, temel bir entity&#8217;nin nas\u0131l tan\u0131mland\u0131\u011f\u0131n\u0131 g\u00f6sterir. <code>id<\/code> alan\u0131 birincil anahtar olarak i\u015faretlenmi\u015f ve veritaban\u0131 taraf\u0131ndan otomatik olarak art\u0131r\u0131lmas\u0131 i\u00e7in <code>GenerationType.IDENTITY<\/code> kullan\u0131lm\u0131\u015ft\u0131r. <code>username<\/code> ve <code>email<\/code> alanlar\u0131 benzersiz ve bo\u015f olamaz.<\/p>\n<h3>\u0130li\u015fki \u00d6rne\u011fi (JPA)<\/h3>\n<p><code>Kategori<\/code> ve <code>Urun<\/code> entity&#8217;leri aras\u0131nda bire \u00e7ok (<code>OneToMany<\/code>) ve \u00e7oktan bire (<code>ManyToOne<\/code>) ili\u015fkiyi g\u00f6sterelim.<\/p>\n<pre><code class=\"language-java\">import jakarta.persistence.CascadeType;\nimport jakarta.persistence.Column;\nimport jakarta.persistence.Entity;\nimport jakarta.persistence.FetchType;\nimport jakarta.persistence.GeneratedValue;\nimport jakarta.persistence.GenerationType;\nimport jakarta.persistence.Id;\nimport jakarta.persistence.JoinColumn;\nimport jakarta.persistence.ManyToOne;\nimport jakarta.persistence.OneToMany;\nimport jakarta.persistence.Table;\nimport java.util.HashSet;\nimport java.util.Set;\n\n@Entity\n@Table(name = \"KATEGORILER\")\npublic class Kategori {\n\n    @Id\n    @GeneratedValue(strategy = GenerationType.IDENTITY)\n    private Long id;\n\n    @Column(nullable = false, unique = true, length = 50)\n    private String ad;\n\n    @OneToMany(mappedBy = \"kategori\", cascade = CascadeType.ALL, fetch = FetchType.LAZY)\n    private Set<Urun> urunler = new HashSet<>();\n\n    \/\/ Constructors, getters, setters\n    public Kategori() {}\n    public Kategori(String ad) { this.ad = ad; }\n\n    public Long getId() { return id; }\n    public void setId(Long id) { this.id = id; }\n    public String getAd() { return ad; }\n    public void setAd(String ad) { this.ad = ad; }\n    public Set<Urun> getUrunler() { return urunler; }\n    public void setUrunler(Set<Urun> urunler) { this.urunler = urunler; }\n\n    public void addUrun(Urun urun) {\n        urunler.add(urun);\n        urun.setKategori(this);\n    }\n}<\/code><\/pre>\n<pre><code class=\"language-java\">import jakarta.persistence.Column;\nimport jakarta.persistence.Entity;\nimport jakarta.persistence.GeneratedValue;\nimport jakarta.persistence.GenerationType;\nimport jakarta.persistence.Id;\nimport jakarta.persistence.JoinColumn;\nimport jakarta.persistence.ManyToOne;\nimport jakarta.persistence.Table;\n\n@Entity\n@Table(name = \"URUNLER\")\npublic class Urun {\n\n    @Id\n    @GeneratedValue(strategy = GenerationType.IDENTITY)\n    private Long id;\n\n    @Column(nullable = false, length = 100)\n    private String ad;\n\n    @Column(nullable = false)\n    private double fiyat;\n\n    @ManyToOne\n    @JoinColumn(name = \"kategori_id\", nullable = false)\n    private Kategori kategori;\n\n    \/\/ Constructors, getters, setters\n    public Urun() {}\n    public Urun(String ad, double fiyat, Kategori kategori) {\n        this.ad = ad;\n        this.fiyat = fiyat;\n        this.kategori = kategori;\n    }\n\n    public Long getId() { return id; }\n    public void setId(Long id) { this.id = id; }\n    public String getAd() { return ad; }\n    public void setAd(String ad) { this.ad = ad; }\n    public double getFiyat() { return fiyat; }\n    public void setFiyat(double fiyat) { this.fiyat = fiyat; }\n    public Kategori getKategori() { return kategori; }\n    public void setKategori(Kategori kategori) { this.kategori = kategori; }\n}<\/code><\/pre>\n<p><code>Kategori<\/code> s\u0131n\u0131f\u0131nda <code>@OneToMany(mappedBy = \"kategori\")<\/code> ili\u015fkisi, <code>Urun<\/code> s\u0131n\u0131f\u0131ndaki <code>kategori<\/code> alan\u0131 taraf\u0131ndan y\u00f6netildi\u011fini belirtir. <code>Urun<\/code> s\u0131n\u0131f\u0131nda ise <code>@ManyToOne<\/code> ve <code>@JoinColumn<\/code> ile yabanc\u0131 anahtar tan\u0131mlanm\u0131\u015ft\u0131r.<\/p>\n<h3>Hibernate \u00d6zel Annotasyon Kullan\u0131m\u0131<\/h3>\n<p>\u015eimdi, <code>Urun<\/code> entity&#8217;mize Hibernate&#8217;e \u00f6zg\u00fc baz\u0131 annotasyonlar ekleyerek daha geli\u015fmi\u015f \u00f6zellikler kazand\u0131ral\u0131m.<\/p>\n<pre><code class=\"language-java\">import jakarta.persistence.Column;\nimport jakarta.persistence.Entity;\nimport jakarta.persistence.GeneratedValue;\nimport jakarta.persistence.GenerationType;\nimport jakarta.persistence.Id;\nimport jakarta.persistence.JoinColumn;\nimport jakarta.persistence.ManyToOne;\nimport jakarta.persistence.Table;\nimport org.hibernate.annotations.Cache;\nimport org.hibernate.annotations.CacheConcurrencyStrategy;\nimport org.hibernate.annotations.Formula;\nimport org.hibernate.annotations.Where;\n\n@Entity\n@Table(name = \"URUNLER\")\n@Cache(usage = CacheConcurrencyStrategy.READ_WRITE) \/\/ Urun entity'sini 2. seviye \u00f6nbelle\u011fe al\n@Where(clause = \"stok_durumu > 0\") \/\/ Varsay\u0131lan olarak sadece stokta olan \u00fcr\u00fcnleri getir\npublic class Urun {\n\n    @Id\n    @GeneratedValue(strategy = GenerationType.IDENTITY)\n    private Long id;\n\n    @Column(nullable = false, length = 100)\n    private String ad;\n\n    @Column(nullable = false)\n    private double fiyat;\n\n    @Column(name = \"stok_durumu\", nullable = false)\n    private int stokDurumu;\n\n    @Formula(\"fiyat * 1.18\") \/\/ KDV dahil fiyat\u0131 hesapla (varsay\u0131msal %18 KDV)\n    private double kdvliFiyat;\n\n    @ManyToOne\n    @JoinColumn(name = \"kategori_id\", nullable = false)\n    private Kategori kategori;\n\n    \/\/ Constructors, getters, setters\n    public Urun() {}\n    public Urun(String ad, double fiyat, int stokDurumu, Kategori kategori) {\n        this.ad = ad;\n        this.fiyat = fiyat;\n        this.stokDurumu = stokDurumu;\n        this.kategori = kategori;\n    }\n\n    public Long getId() { return id; }\n    public void setId(Long id) { this.id = id; }\n    public String getAd() { return ad; }\n    public void setAd(String ad) { this.ad = ad; }\n    public double getFiyat() { return fiyat; }\n    public void setFiyat(double fiyat) { this.fiyat = fiyat; }\n    public int getStokDurumu() { return stokDurumu; }\n    public void setStokDurumu(int stokDurumu) { this.stokDurumu = stokDurumu; }\n    public double getKdvliFiyat() { return kdvliFiyat; } \/\/ Setter olmamal\u0131, \u00e7\u00fcnk\u00fc veritaban\u0131 hesaplar\n    public Kategori getKategori() { return kategori; }\n    public void setKategori(Kategori kategori) { this.kategori = kategori; }\n}<\/code><\/pre>\n<p>Bu \u00f6rnekte:<br \/>\n*   <code>@Cache(usage = CacheConcurrencyStrategy.READ_WRITE)<\/code>: <code>Urun<\/code> entity&#8217;sinin ikinci seviye \u00f6nbellekte <code>READ_WRITE<\/code> stratejisiyle \u00f6nbelle\u011fe al\u0131nmas\u0131n\u0131 sa\u011flar. Bu, s\u0131k okunan ama nadiren g\u00fcncellenen veriler i\u00e7in performans\u0131 art\u0131r\u0131r.<br \/>\n*   <code>@Where(clause = \"stok_durumu > 0\")<\/code>: <code>Urun<\/code> entity&#8217;si sorguland\u0131\u011f\u0131nda, varsay\u0131lan olarak yaln\u0131zca <code>stok_durumu<\/code> 0&#8217;dan b\u00fcy\u00fck olan \u00fcr\u00fcnlerin getirilmesini sa\u011flar. Bu, &#8220;soft delete&#8221; veya aktif\/pasif kay\u0131tlar\u0131 filtrelemek i\u00e7in yayg\u0131n bir kullan\u0131md\u0131r.<br \/>\n<em>   <code>@Formula(\"fiyat <\/em> 1.18\")<\/code>: <code>kdvliFiyat<\/code> alan\u0131, veritaban\u0131 taraf\u0131nda <code>fiyat * 1.18<\/code> SQL ifadesiyle hesaplan\u0131r. Bu, uygulaman\u0131n hesaplama y\u00fck\u00fcn\u00fc azalt\u0131r ve veritaban\u0131n\u0131n yeteneklerinden faydalan\u0131r.<\/p>\n<p>Bu eklemeler, uygulamay\u0131 Hibernate&#8217;e ba\u011f\u0131ml\u0131 hale getirir ancak belirli performans ve i\u015flevsellik gereksinimlerini kar\u015f\u0131lamak i\u00e7in g\u00fc\u00e7l\u00fc ara\u00e7lar sunar.<\/p>\n<h2>Sonu\u00e7<\/h2>\n<p>JPA ve Hibernate annotasyonlar\u0131, modern Java uygulamalar\u0131nda veri kal\u0131c\u0131l\u0131\u011f\u0131 katman\u0131n\u0131 in\u015fa etmek i\u00e7in vazge\u00e7ilmez ara\u00e7lard\u0131r. JPA, Java nesnelerinin ili\u015fkisel veritabanlar\u0131na e\u015flenmesi i\u00e7in standart ve ta\u015f\u0131nabilir bir yol sunarken, Hibernate bu standard\u0131 uygulayan ve ayn\u0131 zamanda standart \u00f6tesi, g\u00fc\u00e7l\u00fc \u00f6zellikler ve optimizasyonlar sa\u011flayan lider bir implementasyondur.<\/p>\n<p>Bir geli\u015ftirici olarak, \u00f6ncelikle JPA annotasyonlar\u0131n\u0131 kullanarak uygulaman\u0131z\u0131n ta\u015f\u0131nabilirli\u011fini ve end\u00fcstri standartlar\u0131na uygunlu\u011funu sa\u011flamal\u0131s\u0131n\u0131z. Ancak, performans, \u00f6zel veri t\u00fcrleri veya geli\u015fmi\u015f \u00f6nbellekleme gibi belirli gereksinimler ortaya \u00e7\u0131kt\u0131\u011f\u0131nda, Hibernate&#8217;in \u00f6zel annotasyonlar\u0131n\u0131 kullanmaktan \u00e7ekinmeyin. Bu annotasyonlar, JPA&#8217;n\u0131n kapsamad\u0131\u011f\u0131 senaryolarda size ince ayar ve daha derinlemesine kontrol imkan\u0131 sunar.<\/p>\n<p>Her iki annotasyon setini de iyi anlamak, hem sa\u011flam ve s\u00fcrd\u00fcr\u00fclebilir hem de performansl\u0131 ve optimize edilmi\u015f Java uygulamalar\u0131 geli\u015ftirmek i\u00e7in anahtard\u0131r. Do\u011fru dengeyi bulmak, uygulaman\u0131z\u0131n ihtiya\u00e7lar\u0131na ve projenizin uzun vadeli hedeflerine ba\u011fl\u0131d\u0131r. Gelecekte de JPA ve Hibernate&#8217;in, geli\u015ftiricilere daha iyi ara\u00e7lar sunmak i\u00e7in birlikte evrilmeye devam edece\u011fi a\u00e7\u0131kt\u0131r.<\/p>\n<p><\/body><\/p>\n","protected":false},"excerpt":{"rendered":"JPA Annotasyonlar\u0131 ve Hibernate Annotasyonlar\u0131: Derinlemesine Bir Kar\u015f\u0131la\u015ft\u0131rma ve Uygulama Rehberi\nGiri\u015f\nG\u00fcn\u00fcm\u00fcz kurumsal Java uygulama","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-32401","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) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>JPA Annotasyonlar\u0131 ve Hibernate Annotasyonlar\u0131: Derinlemesine Bir Kar\u015f\u0131la\u015ft\u0131rma ve Uygulama Rehberi - 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