{"id":61269,"date":"2024-10-13T09:50:14","date_gmt":"2024-10-13T01:50:14","guid":{"rendered":"https:\/\/server.hk\/cnblog\/61269\/"},"modified":"2024-10-13T09:50:14","modified_gmt":"2024-10-13T01:50:14","slug":"ef%e6%a1%86%e6%9e%b6%e6%95%b8%e6%93%9a%e5%ba%ab%e6%9b%b4%e6%96%b0%e6%95%99%e7%a8%8b%e5%88%86%e4%ba%ab%ef%bc%81-ef%e6%a1%86%e6%9e%b6%e6%80%8e%e9%ba%bc%e6%9b%b4%e6%96%b0%e6%95%b8%e6%93%9a%e5%ba%ab","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/61269\/","title":{"rendered":"EF\u6846\u67b6\u6578\u64da\u5eab\u66f4\u65b0\u6559\u7a0b\u5206\u4eab\uff01 (ef\u6846\u67b6\u600e\u9ebc\u66f4\u65b0\u6578\u64da\u5eab)"},"content":{"rendered":"<h1 id=\"ef%e6%a1%86%e6%9e%b6%e6%95%b8%e6%93%9a%e5%ba%ab%e6%9b%b4%e6%96%b0%e6%95%99%e7%a8%8b%e5%88%86%e4%ba%ab%ef%bc%81-gFYCZeHAfy\">EF\u6846\u67b6\u6578\u64da\u5eab\u66f4\u65b0\u6559\u7a0b\u5206\u4eab\uff01<\/h1>\n<p>\u5728\u73fe\u4ee3\u61c9\u7528\u7a0b\u5e8f\u958b\u767c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u7ba1\u7406\u548c\u66f4\u65b0\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002Entity Framework\uff08EF\uff09\u4f5c\u70ba\u4e00\u500b\u6d41\u884c\u7684ORM\uff08\u5c0d\u8c61\u95dc\u4fc2\u6620\u5c04\uff09\u6846\u67b6\uff0c\u63d0\u4f9b\u4e86\u7c21\u4fbf\u7684\u65b9\u5f0f\u4f86\u9032\u884c\u6578\u64da\u5eab\u64cd\u4f5c\u3002\u672c\u6587\u5c07\u5206\u4eab\u5982\u4f55\u4f7f\u7528EF\u6846\u67b6\u4f86\u66f4\u65b0\u6578\u64da\u5eab\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u6b65\u9a5f\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%afentity-framework%ef%bc%9f-gFYCZeHAfy\">\u4ec0\u9ebc\u662fEntity Framework\uff1f<\/h2>\n<p>Entity Framework\u662f\u4e00\u500b\u7531\u5fae\u8edf\u958b\u767c\u7684ORM\u6846\u67b6\uff0c\u65e8\u5728\u7c21\u5316\u6578\u64da\u5eab\u64cd\u4f5c\u3002\u5b83\u5141\u8a31\u958b\u767c\u8005\u4f7f\u7528.NET\u5c0d\u8c61\u4f86\u64cd\u4f5c\u6578\u64da\u5eab\uff0c\u800c\u4e0d\u9700\u8981\u76f4\u63a5\u7de8\u5bebSQL\u8a9e\u53e5\u3002EF\u652f\u6301\u591a\u7a2e\u6578\u64da\u5eab\uff0c\u5305\u62ecSQL Server\u3001MySQL\u548cPostgreSQL\u7b49\u3002<\/p>\n<h2 id=\"ef%e6%a1%86%e6%9e%b6%e7%9a%84%e6%95%b8%e6%93%9a%e5%ba%ab%e6%9b%b4%e6%96%b0%e6%b5%81%e7%a8%8b-gFYCZeHAfy\">EF\u6846\u67b6\u7684\u6578\u64da\u5eab\u66f4\u65b0\u6d41\u7a0b<\/h2>\n<p>\u5728\u4f7f\u7528EF\u9032\u884c\u6578\u64da\u5eab\u66f4\u65b0\u6642\uff0c\u901a\u5e38\u9700\u8981\u9075\u5faa\u4ee5\u4e0b\u5e7e\u500b\u6b65\u9a5f\uff1a<\/p>\n<h3 id=\"1-%e5%ae%89%e8%a3%9dentity-framework-gFYCZeHAfy\">1. \u5b89\u88ddEntity Framework<\/h3>\n<p>\u9996\u5148\uff0c\u78ba\u4fdd\u4f60\u7684\u9805\u76ee\u4e2d\u5df2\u7d93\u5b89\u88dd\u4e86Entity Framework\u3002\u53ef\u4ee5\u901a\u904eNuGet\u5305\u7ba1\u7406\u5668\u4f86\u5b89\u88dd\uff1a<\/p>\n<pre><code>Install-Package EntityFramework<\/code><\/pre>\n<h3 id=\"2-%e5%89%b5%e5%bb%ba%e6%95%b8%e6%93%9a%e6%a8%a1%e5%9e%8b-gFYCZeHAfy\">2. \u5275\u5efa\u6578\u64da\u6a21\u578b<\/h3>\n<p>\u5728EF\u4e2d\uff0c\u6578\u64da\u6a21\u578b\u901a\u5e38\u662f\u901a\u904eC#\u985e\u4f86\u8868\u793a\u7684\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u6578\u64da\u6a21\u578b\u793a\u4f8b\uff1a<\/p>\n<pre><code>public class Product\n{\n    public int Id { get; set; }\n    public string Name { get; set; }\n    public decimal Price { get; set; }\n}<\/code><\/pre>\n<h3 id=\"3-%e9%85%8d%e7%bd%aedbcontext-gFYCZeHAfy\">3. \u914d\u7f6eDbContext<\/h3>\n<p>DbContext\u662fEF\u7684\u6838\u5fc3\u985e\uff0c\u7528\u65bc\u8207\u6578\u64da\u5eab\u9032\u884c\u4ea4\u4e92\u3002\u4ee5\u4e0b\u662f\u5982\u4f55\u914d\u7f6eDbContext\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>public class ApplicationDbContext : DbContext\n{\n    public DbSet Products { get; set; }\n\n    protected override void OnModelCreating(ModelBuilder modelBuilder)\n    {\n        modelBuilder.Entity().ToTable(\"Products\");\n    }\n}<\/code><\/pre>\n<h3 id=\"4-%e6%9b%b4%e6%96%b0%e6%95%b8%e6%93%9a%e5%ba%ab-gFYCZeHAfy\">4. \u66f4\u65b0\u6578\u64da\u5eab<\/h3>\n<p>\u5728EF\u4e2d\uff0c\u66f4\u65b0\u6578\u64da\u5eab\u7684\u904e\u7a0b\u901a\u5e38\u6d89\u53ca\u5230\u4ee5\u4e0b\u5e7e\u500b\u6b65\u9a5f\uff1a<\/p>\n<ul>\n<li>\u5275\u5efa\u4e00\u500b\u65b0\u7684\u5be6\u4f8b\u6216\u67e5\u8a62\u73fe\u6709\u7684\u5be6\u4f8b\u3002<\/li>\n<li>\u4fee\u6539\u5be6\u4f8b\u7684\u5c6c\u6027\u3002<\/li>\n<li>\u8abf\u7528SaveChanges\u65b9\u6cd5\u4f86\u4fdd\u5b58\u66f4\u6539\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u66f4\u65b0\u6578\u64da\u5eab\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>using (var context = new ApplicationDbContext())\n{\n    \/\/ \u67e5\u8a62\u8981\u66f4\u65b0\u7684\u7522\u54c1\n    var product = context.Products.FirstOrDefault(p =&gt; p.Id == 1);\n    \n    if (product != null)\n    {\n        \/\/ \u66f4\u65b0\u7522\u54c1\u7684\u5c6c\u6027\n        product.Name = \"Updated Product Name\";\n        product.Price = 19.99m;\n\n        \/\/ \u4fdd\u5b58\u66f4\u6539\n        context.SaveChanges();\n    }\n}<\/code><\/pre>\n<h3 id=\"5-%e4%bd%bf%e7%94%a8%e9%81%b7%e7%a7%bb%e4%be%86%e6%9b%b4%e6%96%b0%e6%95%b8%e6%93%9a%e5%ba%ab%e6%9e%b6%e6%a7%8b-gFYCZeHAfy\">5. \u4f7f\u7528\u9077\u79fb\u4f86\u66f4\u65b0\u6578\u64da\u5eab\u67b6\u69cb<\/h3>\n<p>\u7576\u6578\u64da\u6a21\u578b\u767c\u751f\u8b8a\u5316\u6642\uff0c\u901a\u5e38\u9700\u8981\u66f4\u65b0\u6578\u64da\u5eab\u67b6\u69cb\u3002EF\u63d0\u4f9b\u4e86\u9077\u79fb\u529f\u80fd\u4f86\u5e6b\u52a9\u7ba1\u7406\u9019\u4e9b\u8b8a\u66f4\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\u4f86\u6dfb\u52a0\u9077\u79fb\uff1a<\/p>\n<pre><code>Add-Migration UpdateProductTable<\/code><\/pre>\n<p>\u7136\u5f8c\uff0c\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\u4f86\u66f4\u65b0\u6578\u64da\u5eab\uff1a<\/p>\n<pre><code>Update-Database<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-gFYCZeHAfy\">\u7e3d\u7d50<\/h2>\n<p>\u4f7f\u7528Entity Framework\u9032\u884c\u6578\u64da\u5eab\u66f4\u65b0\u662f\u4e00\u500b\u9ad8\u6548\u4e14\u7c21\u55ae\u7684\u904e\u7a0b\u3002\u901a\u904e\u6b63\u78ba\u914d\u7f6e\u6578\u64da\u6a21\u578b\u548cDbContext\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u8f15\u9b06\u5730\u9032\u884c\u6578\u64da\u7684\u589e\u522a\u6539\u67e5\u64cd\u4f5c\u3002\u6b64\u5916\uff0c\u5229\u7528EF\u7684\u9077\u79fb\u529f\u80fd\uff0c\u53ef\u4ee5\u65b9\u4fbf\u5730\u7ba1\u7406\u6578\u64da\u5eab\u67b6\u69cb\u7684\u8b8a\u66f4\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u7a69\u5b9a\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u90e8\u7f72\u60a8\u7684\u61c9\u7528\u7a0b\u5e8f\uff0cServer.HK\u63d0\u4f9b\u4e86\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u7684\u5ba2\u6236\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u985e\u578b\u7684 <a href=\"https:\/\/server.hk\">\u4f3a\u670d\u5668<\/a>\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u4f7f\u7528EF\u6846\u67b6\u66f4\u65b0\u6578\u64da\u5eab\uff0c\u638c\u63e1\u6b65\u9a5f\u8207\u6280\u5de7\uff0c\u8f15\u9b06\u63d0\u5347\u6578\u64da\u7ba1\u7406\u6548\u7387\uff01<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-61269","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/61269","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=61269"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/61269\/revisions"}],"predecessor-version":[{"id":61270,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/61269\/revisions\/61270"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=61269"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=61269"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=61269"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}