{"id":165885,"date":"2024-11-05T13:39:18","date_gmt":"2024-11-05T05:39:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/165885\/"},"modified":"2024-11-05T13:39:19","modified_gmt":"2024-11-05T05:39:19","slug":"%e5%bf%ab%e9%80%9f%e5%89%b5%e5%bb%ba%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a6%96%e5%9c%96%ef%bc%9acodefirst%e5%af%a6%e7%8f%be%e6%96%b9%e6%b3%95%e8%a9%b3%e8%a7%a3-codefirst-%e6%95%b8%e6%93%9a%e5%ba%ab","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/165885\/","title":{"rendered":"\u5feb\u901f\u5275\u5efa\u6578\u64da\u5eab\u8996\u5716\uff1aCodeFirst\u5be6\u73fe\u65b9\u6cd5\u8a73\u89e3 (codefirst \u6578\u64da\u5eab\u8996\u5716)"},"content":{"rendered":"

\u5feb\u901f\u5275\u5efa\u6578\u64da\u5eab\u8996\u5716\uff1aCodeFirst\u5be6\u73fe\u65b9\u6cd5\u8a73\u89e3<\/h1>\n

\u5728\u73fe\u4ee3\u61c9\u7528\u7a0b\u5e8f\u958b\u767c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u7ba1\u7406\u548c\u64cd\u4f5c\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u6578\u64da\u5eab\u8996\u5716\u4f5c\u70ba\u4e00\u7a2e\u865b\u64ec\u8868\uff0c\u80fd\u5920\u7c21\u5316\u6578\u64da\u67e5\u8a62\uff0c\u63d0\u5347\u6578\u64da\u7684\u53ef\u8b80\u6027\u548c\u5b89\u5168\u6027\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u5982\u4f55\u4f7f\u7528Code First\u65b9\u6cd5\u5feb\u901f\u5275\u5efa\u6578\u64da\u5eab\u8996\u5716\uff0c\u4e26\u63d0\u4f9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n

\u4ec0\u9ebc\u662f\u6578\u64da\u5eab\u8996\u5716\uff1f<\/h2>\n

\u6578\u64da\u5eab\u8996\u5716\u662f\u4e00\u7a2e\u865b\u64ec\u8868\uff0c\u5b83\u662f\u57fa\u65bcSQL\u67e5\u8a62\u7684\u7d50\u679c\u96c6\u3002\u8996\u5716\u4e0d\u5b58\u5132\u6578\u64da\uff0c\u800c\u662f\u52d5\u614b\u751f\u6210\uff0c\u9019\u4f7f\u5f97\u5b83\u5011\u5728\u6578\u64da\u67e5\u8a62\u548c\u5831\u544a\u4e2d\u975e\u5e38\u6709\u7528\u3002\u901a\u904e\u4f7f\u7528\u8996\u5716\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u96b1\u85cf\u8907\u96dc\u7684\u67e5\u8a62\u908f\u8f2f\uff0c\u4e26\u63d0\u4f9b\u7c21\u5316\u7684\u6578\u64da\u63a5\u53e3\u3002<\/p>\n

Code First\u65b9\u6cd5\u6982\u8ff0<\/h2>\n

Code First\u662fEntity Framework\u7684\u4e00\u7a2e\u958b\u767c\u65b9\u5f0f\uff0c\u5141\u8a31\u958b\u767c\u8005\u901a\u904e\u7de8\u5bebC#\u4ee3\u78bc\u4f86\u5b9a\u7fa9\u6578\u64da\u6a21\u578b\uff0c\u7136\u5f8c\u81ea\u52d5\u751f\u6210\u6578\u64da\u5eab\u7d50\u69cb\u3002\u9019\u7a2e\u65b9\u6cd5\u7279\u5225\u9069\u5408\u65bc\u654f\u6377\u958b\u767c\uff0c\u56e0\u70ba\u5b83\u80fd\u5920\u5feb\u901f\u8fed\u4ee3\u548c\u4fee\u6539\u6578\u64da\u6a21\u578b\u3002<\/p>\n

\u5275\u5efa\u6578\u64da\u5eab\u8996\u5716\u7684\u6b65\u9a5f<\/h2>\n

1. \u5b9a\u7fa9\u6578\u64da\u6a21\u578b<\/h3>\n

\u9996\u5148\uff0c\u6211\u5011\u9700\u8981\u5b9a\u7fa9\u6578\u64da\u6a21\u578b\u3002\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u7c21\u55ae\u7684\u7528\u6236\u548c\u8a02\u55ae\u6a21\u578b\uff1a<\/p>\n

\npublic class User\n{\n    public int UserId { get; set; }\n    public string UserName { get; set; }\n    public virtual ICollection Orders { get; set; }\n}\n\npublic class Order\n{\n    public int OrderId { get; set; }\n    public decimal Amount { get; set; }\n    public int UserId { get; set; }\n    public virtual User User { get; set; }\n}\n<\/code><\/pre>\n
2. \u5275\u5efa\u6578\u64da\u5eab\u4e0a\u4e0b\u6587<\/h3>\n
\u63a5\u4e0b\u4f86\uff0c\u6211\u5011\u9700\u8981\u5275\u5efa\u4e00\u500b\u6578\u64da\u5eab\u4e0a\u4e0b\u6587\u4f86\u7ba1\u7406\u6578\u64da\u6a21\u578b\uff1a<\/p>\n
\npublic class ApplicationDbContext : DbContext\n{\n    public DbSet Users { get; set; }\n    public DbSet Orders { get; set; }\n\n    protected override void OnModelCreating(ModelBuilder modelBuilder)\n    {\n        \/\/ \u5728\u9019\u88e1\u53ef\u4ee5\u914d\u7f6e\u6578\u64da\u6a21\u578b\n    }\n}\n<\/code><\/pre>\n
3. \u5275\u5efa\u8996\u5716\u7684SQL\u67e5\u8a62<\/h3>\n
\u5728Code First\u4e2d\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u539f\u59cbSQL\u67e5\u8a62\u4f86\u5275\u5efa\u8996\u5716\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff0c\u8a72\u8996\u5716\u986f\u793a\u6bcf\u500b\u7528\u6236\u7684\u7e3d\u8a02\u55ae\u91d1\u984d\uff1a<\/p>\n
\npublic class ApplicationDbContext : DbContext\n{\n    \/\/ \u5176\u4ed6\u4ee3\u78bc...\n\n    public void CreateView()\n    {\n        this.Database.ExecuteSqlRaw(@\"\n            CREATE VIEW UserOrderSummary AS\n            SELECT u.UserId, u.UserName, SUM(o.Amount) AS TotalAmount\n            FROM Users u\n            LEFT JOIN Orders o ON u.UserId = o.UserId\n            GROUP BY u.UserId, u.UserName\");\n    }\n}\n<\/code><\/pre>\n
4. \u4f7f\u7528\u8996\u5716<\/h3>\n
\u5275\u5efa\u8996\u5716\u5f8c\uff0c\u6211\u5011\u53ef\u4ee5\u50cf\u4f7f\u7528\u666e\u901a\u8868\u4e00\u6a23\u4f7f\u7528\u5b83\uff1a<\/p>\n
\npublic List GetUserOrderSummaries()\n{\n    return this.Set().FromSqlRaw(\"SELECT * FROM UserOrderSummary\").ToList();\n}\n<\/code><\/pre>\n
\u7e3d\u7d50<\/h2>\n
\u901a\u904e\u4ee5\u4e0a\u6b65\u9a5f\uff0c\u6211\u5011\u53ef\u4ee5\u5feb\u901f\u5275\u5efa\u6578\u64da\u5eab\u8996\u5716\uff0c\u4e26\u5229\u7528Code First\u65b9\u6cd5\u9032\u884c\u6578\u64da\u64cd\u4f5c\u3002\u9019\u4e0d\u50c5\u63d0\u9ad8\u4e86\u958b\u767c\u6548\u7387\uff0c\u9084\u4f7f\u5f97\u6578\u64da\u67e5\u8a62\u66f4\u52a0\u7c21\u6f54\u660e\u4e86\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u7ba1\u7406\u7684\u61c9\u7528\u7a0b\u5e8f\u4f86\u8aaa\uff0c\u638c\u63e1\u9019\u4e9b\u6280\u8853\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002<\/p>\n
\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u7a69\u5b9a\u7684 VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u6301\u60a8\u7684\u61c9\u7528\u7a0b\u5e8f\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u7684 \u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u670d\u52d9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5feb\u901f\u5275\u5efa\u6578\u64da\u5eab\u8996\u5716\u7684CodeFirst\u5be6\u73fe\u65b9\u6cd5\u8a73\u89e3\uff0c\u5e6b\u52a9\u958b\u767c\u8005\u9ad8\u6548\u7ba1\u7406\u6578\u64da\uff0c\u63d0\u5347\u61c9\u7528\u6027\u80fd\u8207\u53ef\u7dad\u8b77\u6027\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-165885","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/165885","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"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=165885"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/165885\/revisions"}],"predecessor-version":[{"id":165886,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/165885\/revisions\/165886"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=165885"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=165885"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=165885"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}