{"id":5308,"date":"2024-08-20T13:34:07","date_gmt":"2024-08-20T11:34:07","guid":{"rendered":"https:\/\/viva.racunalniske-novice.com\/objektno-relacijsko-mapiranje-z-entity-framework\/"},"modified":"2024-08-20T13:34:07","modified_gmt":"2024-08-20T11:34:07","slug":"objektno-relacijsko-mapiranje-z-entity-framework","status":"publish","type":"post","link":"https:\/\/viva.racunalniske-novice.com\/zh\/\u4f7f\u7528\u5b9e\u4f53\u6846\u67b6\u8fdb\u884c\u5bf9\u8c61\u5173\u7cfb\u6620\u5c04\/","title":{"rendered":"\u4f7f\u7528\u5b9e\u4f53\u6846\u67b6\u8fdb\u884c\u5bf9\u8c61\u5173\u7cfb\u6620\u5c04"},"content":{"rendered":"<p><em>\u4f5c\u8005\uff1a\u4e39\u5c3c\u65af\u00b7\u5df4\u5170\u7279\u3001\u57c3\u5185\u5409\u00b7\u80e1\u591a\u5e03\u96f7\u5179\u5c3c\u514b<\/em><\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<p>\u5c3d\u7ba1\u6280\u672f\u53d1\u5c55\u8fc5\u901f\uff0c\u4f46\u662f\u7ba1\u7406\u5173\u7cfb\u6570\u636e\u5e93\u7684\u4e3b\u8981\u8bed\u8a00\u4ecd\u7136\u662f SQL\u3002\u4e00\u79cd\u7ed3\u6784\u5316\u67e5\u8be2\u8bed\u8a00\uff0c\u5176\u6839\u6e90\u53ef\u8ffd\u6eaf\u5230 20 \u4e16\u7eaa 70 \u5e74\u4ee3\uff0c\u6709\u8bb8\u591a\u6539\u7f16\u7684\u884d\u751f\u4ea7\u54c1\uff08PostgreSQL\u3001MySQL \u7b49\uff09\u3002&nbsp;<\/p>\n\n\n\n<p>\u7f16\u5199 SQL \u67e5\u8be2\u901a\u5e38\u662f\u4e00\u9879\u975e\u5e38\u8017\u65f6\u7684\u5de5\u4f5c\uff0c\u5c24\u5176\u662f\u5728\u6570\u636e\u5e93\u7ed3\u6784\u66f4\u590d\u6742\u7684\u60c5\u51b5\u4e0b\u3002\u4e0e\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u8bed\u8a00\u7684\u5178\u578b\u505a\u6cd5\u4e0d\u540c\uff0c\u65e0\u9700\u624b\u52a8\u7f16\u5199\u67e5\u8be2\u548c\u5bf9\u8c61\u8f6c\u6362\uff0c\u800c\u662f\u5c06\u7c7b\u4ece\u6e90\u4ee3\u7801\u6620\u5c04\u5230\u6570\u636e\u6a21\u5f0f\uff0c\u800c\u4e0d\u662f\u53cd\u8fc7\u6765\uff0c\u8fd9\u6837\u66f4\u52a0\u81ea\u7136\uff0c\u800c\u4e14\u901a\u5e38\u66f4\u7b80\u5355\u3002\u8fd9\u8282\u7701\u4e86\u5f00\u53d1\u65f6\u95f4\u5e76\u4e14\u4f7f\u5f97\u8bc6\u522b\u5b9e\u4f53\u4e4b\u95f4\u7684\u5173\u7cfb\u53d8\u5f97\u66f4\u52a0\u5bb9\u6613\u3002\u8fd9\u79cd\u65b9\u6cd5\u79f0\u4e3a\u5bf9\u8c61\u5173\u7cfb\u6620\u5c04\uff08ORM\uff09\u3002<\/p>\n\n\n\n<p>\u5bf9\u4e8e .NET \u73af\u5883\uff0c\u5fae\u8f6f\u63d0\u4f9b\u4e86\u5f00\u6e90\u7684 Entity Framework Core\uff08\u7b80\u79f0 EF Core\uff09\uff0c\u5b83\u652f\u6301\u6570\u636e\u9a71\u52a8\u5f00\u53d1\uff08\u6240\u8c13\u7684 Code First \u65b9\u6cd5\uff09\uff0c\u5176\u4e2d\u4e92\u8fde\u7684\u6570\u636e\u88ab\u7b80\u5355\u5730\u6536\u96c6\u5230\u4ee3\u8868\u8868\u7684\u7c7b\u4e2d\uff0c\u6846\u67b6\u4f7f\u7528\u5b83\u4eec\u6765\u89e3\u6790\u5173\u7cfb\u5e76\u4ee5\u81ea\u5df1\u7684\u683c\u5f0f\u521b\u5efa\u6570\u636e\u5e93\u6a21\u5f0f\u3002\u8fd9\u79cd\u65b9\u6cd5\u7684\u6700\u5927\u4f18\u70b9\u662f\u65e0\u9700\u4e86\u89e3 SQL \u5c31\u53ef\u4ee5\u5728\u6240\u9700\u7684\u6570\u636e\u5e93\u4e0a\u5b89\u88c5\u6570\u636e\u6a21\u5f0f\u3002<\/p>\n\n\n\n<p>EF Core \u901a\u8fc7\u79f0\u4e3a\u6570\u636e\u5e93\u63d0\u4f9b\u7a0b\u5e8f\u7684\u63d2\u4ef6\u5e93\u4e0e\u6570\u636e\u5e93\u901a\u4fe1\uff0c\u56e0\u6b64\u8fc1\u79fb\u5230\u53e6\u4e00\u4e2a\u6570\u636e\u5e93\u5f88\u5bb9\u6613\u3002\u7528\u6237\u53ef\u4ee5\u901a\u8fc7\u5305\u7ba1\u7406\u5668\uff08C# \u7684 NuGet\uff09\u5b89\u88c5\u8fd9\u4e9b\u3002\u5b98\u65b9\u5e93\u4ec5\u9002\u7528\u4e8e Microsoft \u7684 SQL Server \u548c Azure Cosmos DB \u89e3\u51b3\u65b9\u6848\u4ee5\u53ca SQLite \u9879\u76ee\uff0c\u4f46\u7531\u4e8e\u5f3a\u5927\u7684\u5f00\u6e90\u793e\u533a\uff0c\u8be5\u6846\u67b6\u51e0\u4e4e\u652f\u6301\u6240\u6709\u4e3b\u8981\u5173\u7cfb\u6570\u636e\u5e93\uff08MySQL\u3001PostgreSQL \u7b49\uff09\u3002<\/p>\n\n\n\n<p>\u4f5c\u4e3a\u6570\u636e\u5efa\u6a21\u7684\u4e00\u4e2a\u793a\u4f8b\uff0c\u8ba9\u6211\u4eec\u770b\u4e00\u4e0b\u8868\u201c\u5b66\u751f\u201d\uff0c\u8be5\u8868\u5177\u6709\u5c5e\u6027\u540d\u5b57\uff08\u6700\u591a 20 \u4e2a\u5b57\u7b26\u7684\u5b57\u7b26\u4e32\uff09\u3001\u59d3\u6c0f\uff08\u6700\u591a 20 \u4e2a\u5b57\u7b26\u7684\u5b57\u7b26\u4e32\uff09\u548c\u552f\u4e00\u6807\u8bc6\u7b26\uff08\u6574\u6570\uff09\u3002&nbsp;<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2024\/08\/image-9.png\" alt=\"\" class=\"wp-image-2538966\"\/><figcaption><sub>\u5b66\u751f\u8868\uff08\u81ea\u6709\u6765\u6e90\uff09<\/sub><\/figcaption><\/figure><\/div>\n\n\n\n<p>\u5728PostgreSQL\u4e2d\uff0c\u6211\u4eec\u5bf9\u8be5\u8868\u7684\u5b9a\u4e49\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2024\/08\/image-10.png\" alt=\"\" class=\"wp-image-2538968\"\/><figcaption><sub>PostgreSQL \u4e2d Student \u8868\u7684\u5b9a\u4e49\uff08\u81ea\u6709\u6765\u6e90\uff09<\/sub><\/figcaption><\/figure>\n\n\n\n<p>\u9664\u4e86\u5b9a\u4e49\u540d\u5b57\u548c\u59d3\u6c0f\u7684\u57fa\u672c\u7c7b\u578b\u4e4b\u5916\uff0c\u6211\u4eec\u8fd8\u8981\u6c42\u5b83\u4eec\u6c38\u8fdc\u4e0d\u4e3a\u7a7a\uff08NOT NULL\uff09\u3002 SERIAL \u7c7b\u578b\u4ee3\u8868\u4e00\u4e2a\u552f\u4e00\u7684\u6574\u6570\uff0c\u5728\u6211\u4eec\u7684\u4f8b\u5b50\u4e2d\uff0c\u5b83\u5145\u5f53\u4e3b\u952e Id\u3002\u5bf9\u4e8e\u6bcf\u4e2a\u6dfb\u52a0\u7684\u5b9e\u4f53\uff0c\u90fd\u4f1a\u6839\u636e\u5148\u524d\u6dfb\u52a0\u7684\u8eab\u4efd\u7684ID\u81ea\u52a8\u786e\u5b9a\uff0c\u8be5ID\u53ea\u662f\u7b80\u5355\u5730\u9012\u589e\u3002<\/p>\n\n\n\n<p>\u4f7f\u7528 ORM \u5728\u5e94\u7528\u7a0b\u5e8f\u903b\u8f91\u7684\u6e90\u4ee3\u7801\u4e2d\u5c06\u8868\u5b9a\u4e49\u4e3a\u7c7b\u8981\u5bb9\u6613\u5f97\u591a\uff0c\u5b83\u4f1a\u81ea\u52a8\u521b\u5efa\u5bf9\u8c61\u548c\u76f8\u5e94\u7684\u6570\u636e\u5e93\u8981\u6c42\u3002\u7c7b\u5c5e\u6027\u4e0a\u65b9\u7684Key\u6807\u7b7e\u8868\u793a\u4e3b\u952e\uff0cRequired\u8868\u793a\u8be5\u5c5e\u6027\u4e0d\u80fd\u4e3a\u7a7a\u3002<\/p>\n\n\n\n<p>\u5f00\u53d1\u5b8c\u6210\u540e\uff0cEF Core \u5141\u8bb8\u6211\u4eec\u81ea\u52a8\u4ece\u4ee3\u7801\u751f\u6210\u6570\u636e\u6a21\u5f0f\uff0c\u5e76\u901a\u8fc7\u6846\u67b6\u4e2d\u5305\u542b\u7684\u547d\u4ee4\u884c\u5de5\u5177\u5c06\u5176\u90e8\u7f72\u5230\u9009\u5b9a\u7684\u6570\u636e\u5e93\u3002\u6570\u636e\u5e93\u6a21\u5f0f\u7684\u9010\u6b65\u53d8\u5316\u662f\u901a\u8fc7\u6240\u8c13\u7684\u8fc1\u79fb\u6765\u7ba1\u7406\u7684\uff0c\u8fd9\u786e\u4fdd\u6570\u636e\u5e93\u4e0e\u5e94\u7528\u7a0b\u5e8f\u6570\u636e\u6a21\u578b\u4fdd\u6301\u540c\u6b65\u3002\u65b0\u7684\u8fc1\u79fb\u4ee5\u7279\u6b8a\u7c7b\u7684\u5f62\u5f0f\u5b58\u50a8\u5728 EF Core \u4e2d\uff0c\u662f\u901a\u8fc7\u5c06\u5f53\u524d\u6570\u636e\u6a21\u578b\u4e0e\u5f53\u524d\u6570\u636e\u5e93\u6a21\u5f0f\uff08\u4e0a\u6b21\u8fc1\u79fb\u7684\u72b6\u6001\uff09\u8fdb\u884c\u6bd4\u8f83\u521b\u5efa\u7684\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2024\/08\/image-11.png\" alt=\"\" class=\"wp-image-2538970\"\/><figcaption><em>\u5728 .NET \u73af\u5883\u4e2d\u4f7f\u7528 EF Core \u5b9a\u4e49 Student \u8868\uff08\u81ea\u6709\u6e90\u4ee3\u7801\uff09<\/em><\/figcaption><\/figure>\n\n\n\n<p>\u6570\u636e\u5e93\u8fde\u63a5\u7531\u7ee7\u627fDbContext\u7c7b\u7684\u7c7b\u62bd\u8c61\u3002\u5176\u5c5e\u6027\u662f\u6620\u5c04\u5230\u8868\u7684 DbSet \u7c7b\u578b\u7684\u5b9e\u4f53\u7684\u96c6\u5408\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2024\/08\/image-12.png\" alt=\"\" class=\"wp-image-2538972\"\/><figcaption><sub>\u6570\u636e\u5e93\u8fde\u63a5\u7c7b\u53ca\u5b9a\u4e49\u5b66\u751f\u8868\uff08\u81ea\u5e26\u6e90\u7801\uff09<\/sub><\/figcaption><\/figure>\n\n\n\n<p>\u4e0a\u8ff0\u67e5\u8be2\u7f16\u5199\u6846\u67b6\u4f7f\u7528 LINQ \u8bed\u6cd5\uff0c\u5b83\u4ee3\u8868\u4e86\u4ece\u5404\u79cd\u6765\u6e90\u68c0\u7d22\u548c\u5904\u7406\u6570\u636e\u7684\u7edf\u4e00\u65b9\u6cd5\u3002\u7136\u540e\u5c06\u67e5\u8be2\u8f6c\u6362\u4e3a SQL\uff0c\u5e76\u5c06\u7ed3\u679c\u672c\u8eab\u8f6c\u6362\u56de\u5bf9\u8c61\u3001\u5176\u5c5e\u6027\u6216\u5bf9\u8c61\u8868\u3002<\/p>\n\n\n\n<p>\u4e0b\u9762\u7684\u793a\u4f8b\u663e\u793a\u4e86\u5bf9\u5df2\u77e5\u5165\u5b66\u7f16\u53f7\u7684\u5b66\u751f\u7684\u67e5\u8be2\u3002\u53ea\u9700\u4f7f\u7528\u4e3b\u952e\u503c\uff08ID\uff09\u8c03\u7528\u4e00\u6b21 Find \u65b9\u6cd5\u5c31\u8db3\u591f\u4e86\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2024\/08\/image-13.png\" alt=\"\" class=\"wp-image-2538974\"\/><figcaption><sub>\u4f7f\u7528 EF Core \u8fdb\u884c\u5b66\u751f\u67e5\u8be2\u7684\u793a\u4f8b\uff08\u81ea\u6709\u6765\u6e90\uff09<\/sub><\/figcaption><\/figure>\n\n\n\n<p>\u5982\u679c\u6211\u4eec\u60f3\u5728\u4e0d\u4f7f\u7528 ORM \u5de5\u5177\u7684\u60c5\u51b5\u4e0b\u5b9e\u73b0\u76f8\u540c\u7684\u7ed3\u679c\uff0c\u5219\u9700\u8981\u66f4\u591a\u7684\u4ee3\u7801\u3002\u663e\u793a\u4e86\u4f7f\u7528 NpgSql \u5e93\u7684\u793a\u4f8b\u3002\u9996\u5148\uff0c\u6211\u4eec\u9700\u8981\u521b\u5efa\u4ee3\u8868 SQL \u67e5\u8be2\u548c\u6570\u636e\u5e93\u8bfb\u53d6\u7684\u5bf9\u8c61\uff0c\u4f46\u6211\u4eec\u9700\u8981\u5c0f\u5fc3\u6b63\u786e\u5730\u5305\u542b\u53c2\u6570\u4ee5\u907f\u514d\u6f5c\u5728\u7684\u6f0f\u6d1e\uff0c\u4f8b\u5982SQL \u6ce8\u5165\u3002\u8fd9\u6b21\u6211\u4eec\u5fc5\u987b\u81ea\u5df1\u521b\u5efa\u5b66\u751f\u5bf9\u8c61\uff0c\u4f46\u662f\u6211\u4eec\u5fc5\u987b\u5c0f\u5fc3\u67e5\u8be2\u4e2d\u5c5e\u6027\u7684\u987a\u5e8f\u4ee5\u53ca\u67e5\u8be2\u4e2d\u51fa\u73b0\u9519\u8bef\u7684\u53ef\u80fd\u6027\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2024\/08\/image-14.png\" alt=\"\" class=\"wp-image-2538976\"\/><figcaption><sub>\u4f7f\u7528 NpgSql \u5e93\uff08\u81ea\u5df1\u7684\u6e90\u4ee3\u7801\uff09\u67e5\u8be2\u5b66\u751f\u7684\u793a\u4f8b<\/sub><\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2024\/08\/image-15.png\" alt=\"\" class=\"wp-image-2538978\"\/><figcaption><sub>\u4e0a\u8ff0\u95ee\u9898\u7684\u7b54\u6848\uff08\u6765\u6e90\u81ea\u7f51\u7edc\uff09<\/sub><\/figcaption><\/figure>\n\n\n\n<p>\u56e0\u6b64\uff0c\u5bf9\u8c61\u5173\u7cfb\u6620\u5c04\u4e3a\u6211\u4eec\u63d0\u4f9b\u4e86\u4e00\u4e2a\u62bd\u8c61\u5c42\uff0c\u7531\u4e8e\u5b83\u6620\u5c04\u81ea\u9762\u5411\u5bf9\u8c61\u7684\u5f00\u53d1\u8ba1\u5212\uff0c\u56e0\u6b64\u53ef\u4ee5\u663e\u8457\u52a0\u5feb\u8f6f\u4ef6\u5f00\u53d1\u901f\u5ea6\uff0c\u56e0\u4e3a SQL \u4ee3\u7801\u4e0d\u5fc5\u4e0e\u6e90\uff08\u901a\u5e38\u662f\u9762\u5411\u5bf9\u8c61\u7684\uff09\u4ee3\u7801\u5206\u5f00\u7f16\u5199\u3002\u7f16\u5199\u826f\u597d\u7684 ORM \u652f\u6301\u5e94\u7528\u7a0b\u5e8f\u8bbe\u8ba1\u7684\u826f\u597d\u5f00\u53d1\u6a21\u5f0f\u548c\u5b9e\u8df5\uff0c\u540c\u65f6\u4e5f\u5141\u8bb8\u4e0d\u719f\u6089 SQL \u7684\u5f00\u53d1\u4eba\u5458\u66f4\u8f7b\u677e\u5730\u5c06\u5173\u7cfb\u6570\u636e\u5e93\u96c6\u6210\u5230\u4ed6\u4eec\u7684\u5e94\u7528\u7a0b\u5e8f\u4e2d\u3002<\/p>\n\n\n\n<p>\u7136\u800c\uff0c\u5fc5\u987b\u5f3a\u8c03\u7684\u662f\uff0cORM \u5e76\u4e0d\u662f\u4e00\u4e2a\u5b8c\u7f8e\u7684\u89e3\u51b3\u65b9\u6848\u3002\u5176\u5f31\u70b9\u6070\u6070\u5728\u4e8e\u5b83\u7ed9\u6211\u4eec\u63d0\u4f9b\u7684\u62bd\u8c61\u6982\u5ff5\u3002\u5b83\u751f\u6210\u7684 SQL \u4ee3\u7801\u6bd4\u5f00\u53d1\u4eba\u5458\u7f16\u5199\u7684\u8981\u591a\u5f97\u591a\uff0c\u8fd9\u4f1a\u4e25\u91cd\u5f71\u54cd\u5e94\u7528\u7a0b\u5e8f\u901f\u5ea6\u3001\u9690\u85cf\u4e0d\u826f\u7684\u6570\u636e\u5e93\u8bbf\u95ee\u5b9e\u8df5\uff0c\u5e76\u4e14\u8fd8\u4f1a\u9020\u6210\u5411\u540e\u517c\u5bb9\u6027\u95ee\u9898\u3002\u867d\u7136\u751f\u6210\u7684\u4ee3\u7801\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\u662f\u6b63\u786e\u7684\uff0c\u4f46\u4ecd\u7136\u5efa\u8bae\u624b\u52a8\u68c0\u67e5\u548c\u6d4b\u8bd5\u5b83\u3002<\/p>\n\n\n\n<p>\u5bf9\u8c61\u5173\u7cfb\u6620\u5c04\u4e0d\u662f .NET \u73af\u5883\u539f\u751f\u7684\u529f\u80fd\u3002\u5927\u591a\u6570\u9488\u5bf9\u4e0d\u540c\u8bed\u8a00\u7684\u6846\u67b6\u548c\u5e93\u90fd\u63d0\u4f9b\u8be5\u529f\u80fd\u3002\u4f8b\u5982 Python \u7684 Django\u3001Go \u7684 Gorm\u3001Java \u7684 Spring\u3001JavaScript\uff08\u6216 Node.js\uff09\u7684 Prisma\u2026\u2026<\/p>","protected":false},"excerpt":{"rendered":"<p>Avtorja: Denis Balant, Enej Hudobreznik Kljub hitremu razvoju tehnologije pa je glavni jezik za upravljanje z relacijskimi podatkovnimi bazami \u0161e vedno SQL oz. strukturirani poizvedbeni jezik, ki ima z mnogimi prilagojenimi izpeljankami (PostgreSQL, MySQL \u2026) korenine \u017ee v 70. letih prej\u0161njega stoletja.&nbsp; Pisanje SQL-poizvedb se pogosto izka\u017ee za dokaj zamudno delo, \u0161e posebej pri kompleksnej\u0161i [&hellip;]<\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[66],"tags":[],"class_list":["post-5308","post","type-post","status-publish","format-standard","hentry","category-programi"],"acf":{"subtitle":"Danes je svetovni splet najpopularnej\u0161a storitev najve\u010djega ra\u010dunalni\u0161kega omre\u017eja Internet. Vsak dan se mu pridru\u017ei preko 100 000 novih spletnih strani, ki segajo od stati\u010dnih z minimalno podporo interakcije do dinami\u010dnih, ki za izvajanje svojih funkcij potrebujejo veliko koli\u010dino a\u017eurnih podatkov. ","heading":"","summary":"Danes je svetovni splet najpopularnej\u0161a storitev najve\u010djega ra\u010dunalni\u0161kega omre\u017eja Internet. Vsak dan se mu pridru\u017ei preko 100 000 novih spletnih strani, ki segajo od stati\u010dnih z minimalno podporo interakcije do dinami\u010dnih, ki za izvajanje svojih funkcij potrebujejo veliko koli\u010dino a\u017eurnih podatkov.","thumbnail_small":"https:\/\/racunalniske-novice.com\/wp-content\/uploads\/2024\/08\/computer-560x315.jpg","thumbnail_large":"https:\/\/racunalniske-novice.com\/wp-content\/uploads\/2024\/08\/computer-1024x678.jpg","thumbnail_caption":"Fotografija je ilustrativna. 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