<\/div>\n

Merhaba,<\/p>\n

Entity Framework – Code First yap\u0131s\u0131na \u00f6nceki yaz\u0131lar\u0131m\u0131zda giri\u015f yapm\u0131\u015ft\u0131k. \u00d6nceki yaz\u0131lara g\u00f6z atmak i\u00e7in Entity Framework<\/a> isimli kategoriye gitmeniz yeterlidir. Bu yaz\u0131m\u0131zda ise Code First yakla\u015f\u0131m\u0131nda DbContext \u00fczerinden gelen OnModelCreating metodunu inceleyece\u011fiz.<\/p>\n

OnModelCreating Metodu Nas\u0131l \u00c7al\u0131\u015f\u0131r? Ne \u0130\u015flev G\u00f6rmektedir?<\/strong><\/em>
\nOnModelCreating metodu, veritaban\u0131 ilk defa olu\u015fturulurken tetiklenen bir virtual metotdur. DbContext i\u00e7erisinde bulunur. Code First yap\u0131s\u0131nda DbContext’ten miras alarak olu\u015fturdu\u011fumuz Context s\u0131n\u0131f\u0131m\u0131zda override ederek kullanaca\u011f\u0131z. Bu metod sayesinde veritaban\u0131 tablolar\u0131 olu\u015fturulmadan araya girecek, tablo isimlerine m\u00fcdahale edebilecek veya kolonlara istedi\u011fimiz ayarlar\u0131 ger\u00e7ekle\u015ftirebilece\u011fiz.<\/p>\n

\u015eimdi a\u015fa\u011f\u0131daki kod blo\u011funu inceleyiniz.<\/p>\n

\r\n    class OkulDBContext : DbContext\r\n    {\r\n        public DbSet<Ogrenci> Ogrenciler { get; set; }\r\n        public DbSet<Ogretmen> Ogretmenler { get; set; }\r\n        public DbSet<Memur> Memurlar { get; set; }\r\n    }\r\n<\/pre>\nBu \u015fekilde bir Context’i \u00e7al\u0131\u015ft\u0131r\u0131p, veritaban\u0131n\u0131 olu\u015fturdu\u011fumuz zaman tablolarda a\u015fa\u011f\u0131daki gibi bir isimlendirmeyle kar\u015f\u0131la\u015f\u0131yoruz.<\/p>\n<\/a>Entity Framework – Code First OnModelCreating Metodu<\/p><\/div>\n
G\u00f6rd\u00fc\u011f\u00fcn\u00fcz gibi olu\u015fturmak istedi\u011fim tablolar\u0131n isimlerinin sonuna ‘s’ tak\u0131s\u0131 koyulmakta, bu \u015fekilde anlams\u0131z bir veritaban\u0131 dizayn\u0131yla kar\u015f\u0131la\u015f\u0131lmaktad\u0131r.<\/p>\nTablo Ad\u0131n\u0131 Ayarlama<\/span><\/h4>\nOnModelCreating metodu ile tablolar olu\u015fturulmadan araya girerek a\u015fa\u011f\u0131daki gibi tablo isimlerini belirleyebiliyoruz.<\/p>\n\r\n    class OkulDBContext : DbContext\r\n    {\r\n        public DbSet<Ogrenci> Ogrenciler { get; set; }\r\n        public DbSet<Ogretmen> Ogretmenler { get; set; }\r\n        public DbSet<Memur> Memurlar { get; set; }\r\n\r\n        protected override void OnModelCreating(DbModelBuilder modelBuilder)\r\n        {\r\n            modelBuilder.Entity<Ogrenci>().ToTable("Ogrenciler");\r\n            modelBuilder.Entity<Ogretmen>().ToTable("Ogretmenler");\r\n            modelBuilder.Entity<Memur>().ToTable("Memurlar");\r\n        }\r\n    }\r\n<\/pre>\nBu \u015fekilde al\u0131nan sonu\u00e7 a\u015fa\u011f\u0131daki gibidir.<\/p>\n<\/a>Entity Framework – Code First OnModelCreating Metodu<\/p><\/div>\n
ToTable metodunun a\u015fa\u011f\u0131daki gibi ikinci parametresinide kullan\u0131rsak e\u011fer olu\u015fturulacak tablonun varsay\u0131lan(dbo) \u015femas\u0131 yerine verilen de\u011feri \u015fema olarak belirtebilirsiniz.<\/p>\n\r\n    class OkulDBContext : DbContext\r\n    {\r\n        public DbSet<Ogrenci> Ogrenciler { get; set; }\r\n        public DbSet<Ogretmen> Ogretmenler { get; set; }\r\n        public DbSet<Memur> Memurlar { get; set; }\r\n\r\n        protected override void OnModelCreating(DbModelBuilder modelBuilder)\r\n        {\r\n            modelBuilder.Entity<Ogrenci>().ToTable("Ogrenciler", "okul");\r\n            modelBuilder.Entity<Ogretmen>().ToTable("Ogretmenler", "okul");\r\n            modelBuilder.Entity<Memur>().ToTable("Memurlar", "okul");\r\n        }\r\n    }\r\n<\/pre>\n<\/a>Entity Framework – Code First OnModelCreating Metodu<\/p><\/div>\nKolon \u00d6zelliklerini\u00a0Ayarlama<\/span><\/h4>\nTablolar olu\u015fturulmadan nas\u0131l araya girerek tablo ad\u0131n\u0131 ayarlad\u0131ysak, ayn\u0131 mant\u0131kla kolonlar i\u00e7inde ayarlama ger\u00e7ekle\u015ftirebiliriz.<\/p>\n\r\n        protected override void OnModelCreating(DbModelBuilder modelBuilder)\r\n        {\r\n          ...\r\n            modelBuilder.Entity<Ogrenci>().Property(p => p.Adi)\r\n                .HasColumnName("Adi")\r\n                .HasColumnOrder(2)\r\n                .HasMaxLength(30);\r\n          ...\r\n        }\r\n<\/pre>\nYukar\u0131daki \u00f6rnek kod blo\u011funu incelerseniz e\u011fer sadece Ogrenci tablosuna \u00f6rneklendirme yap\u0131lm\u0131\u015ft\u0131r. \u00d6rnek ama\u00e7l\u0131 “Adi” kolunu se\u00e7ilmi\u015f ve “HasColumnName” metodu ile ad\u0131n\u0131, “HasColumnOrder” metodu ile s\u0131ralamas\u0131n\u0131 ve “HasMaxLength” metodu ile de karakter say\u0131s\u0131n\u0131 belirtmi\u015f oldum. Tabi burada \u00f6rneklendirme ama\u00e7l\u0131 s\u0131n\u0131rl\u0131 metodlar se\u00e7ilmi\u015ftir. Siz kurcalayarak daha geni\u015f bilgi edinebilirsiniz. <\/p>\n<\/a>Entity Framework – Code First OnModelCreating Metodu<\/p><\/div>\n
Bu yaz\u0131m\u0131z\u0131nda sonuna gelmi\u015f bulunmaktay\u0131z.
\nZahmet edip, okudu\u011funuz i\u00e7in te\u015fekk\u00fcr ederim…<\/p>\n
Sonraki yaz\u0131lar\u0131mda g\u00f6r\u00fc\u015fmek \u00fczere…
\n\u0130yi \u00e7al\u0131\u015fmalar…<\/p>\n","protected":false},"excerpt":{"rendered":"
Merhaba, Entity Framework – Code First yap\u0131s\u0131na \u00f6nceki yaz\u0131lar\u0131m\u0131zda giri\u015f yapm\u0131\u015ft\u0131k. \u00d6nceki yaz\u0131lara g\u00f6z atmak i\u00e7in Entity Framework isimli kategoriye gitmeniz yeterlidir. Bu yaz\u0131m\u0131zda ise Code First yakla\u015f\u0131m\u0131nda DbContext \u00fczerinden gelen OnModelCreating metodunu inceleyece\u011fiz....<\/p>\n","protected":false},"author":1,"featured_media":3739,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[955],"tags":[952,975,963,979,980,981,977,974,976,978],"class_list":["post-3752","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-entity-framework","tag-code-first","tag-ef","tag-entity-framework","tag-hascolumnname","tag-hascolumnorder","tag-hasmaxlength","tag-modelbuilder","tag-onmodelcreating","tag-table-name","tag-totable"],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/posts\/3752","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/comments?post=3752"}],"version-history":[{"count":0,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/posts\/3752\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/media\/3739"}],"wp:attachment":[{"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/media?parent=3752"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/categories?post=3752"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.gencayyildiz.com\/blog\/wp-json\/wp\/v2\/tags?post=3752"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}