{"id":61189,"date":"2024-10-13T09:10:18","date_gmt":"2024-10-13T01:10:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/61189\/"},"modified":"2024-10-13T09:10:18","modified_gmt":"2024-10-13T01:10:18","slug":"django%e9%ab%98%e6%95%88%e6%93%8d%e4%bd%9c%e6%95%b8%e6%93%9a%e5%ba%ab%ef%bc%8c%e8%bc%95%e9%ac%86%e5%bf%ab%e6%8d%b7%e6%a7%8b%e5%bb%ba%e7%b6%b2%e7%ab%99-django%e8%88%87%e6%95%b8%e6%93%9a%e5%ba%ab","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/61189\/","title":{"rendered":"Django\u9ad8\u6548\u64cd\u4f5c\u6578\u64da\u5eab\uff0c\u8f15\u9b06\u5feb\u6377\u69cb\u5efa\u7db2\u7ad9 (django\u8207\u6578\u64da\u5eab\u64cd\u4f5c)"},"content":{"rendered":"

Django\u9ad8\u6548\u64cd\u4f5c\u6578\u64da\u5eab\uff0c\u8f15\u9b06\u5feb\u6377\u69cb\u5efa\u7db2\u7ad9<\/h1>\n

Django\u662f\u4e00\u500b\u9ad8\u6548\u7684Python\u7db2\u9801\u6846\u67b6\uff0c\u56e0\u5176\u5f37\u5927\u7684\u529f\u80fd\u548c\u9748\u6d3b\u6027\u800c\u53d7\u5230\u5ee3\u6cdb\u6b61\u8fce\u3002\u5728\u69cb\u5efa\u7db2\u7ad9\u6642\uff0c\u6578\u64da\u5eab\u64cd\u4f5c\u662f\u4e0d\u53ef\u6216\u7f3a\u7684\u4e00\u90e8\u5206\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u5728Django\u4e2d\u9ad8\u6548\u5730\u64cd\u4f5c\u6578\u64da\u5eab\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u6280\u5de7\u3002<\/p>\n

Django\u7684ORM\uff08\u5c0d\u8c61\u95dc\u4fc2\u6620\u5c04\uff09<\/h2>\n

Django\u7684ORM\u4f7f\u5f97\u958b\u767c\u8005\u53ef\u4ee5\u4f7f\u7528Python\u4ee3\u78bc\u4f86\u64cd\u4f5c\u6578\u64da\u5eab\uff0c\u800c\u4e0d\u9700\u8981\u76f4\u63a5\u7de8\u5bebSQL\u8a9e\u53e5\u3002\u9019\u4e0d\u50c5\u63d0\u9ad8\u4e86\u958b\u767c\u6548\u7387\uff0c\u9084\u6e1b\u5c11\u4e86\u56e0\u624b\u52d5\u7de8\u5bebSQL\u800c\u53ef\u80fd\u51fa\u73fe\u7684\u932f\u8aa4\u3002<\/p>\n

\u6a21\u578b\u7684\u5b9a\u7fa9<\/h3>\n

\u5728Django\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u8868\u7531\u6a21\u578b\uff08Model\uff09\u4f86\u8868\u793a\u3002\u6bcf\u500b\u6a21\u578b\u985e\u5225\u5c0d\u61c9\u4e00\u500b\u6578\u64da\u5eab\u8868\uff0c\u985e\u5225\u7684\u5c6c\u6027\u5c0d\u61c9\u8868\u4e2d\u7684\u5b57\u6bb5\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u6a21\u578b\u793a\u4f8b\uff1a<\/p>\n

from django.db import models\n\nclass Blog(models.Model):\n    title = models.CharField(max_length=200)\n    content = models.TextField()\n    created_at = models.DateTimeField(auto_now_add=True)\n\n    def __str__(self):\n        return self.title\n<\/code><\/pre>\n
\u6578\u64da\u7684\u589e\u522a\u6539\u67e5<\/h3>\n
\u4f7f\u7528Django\u7684ORM\uff0c\u6211\u5011\u53ef\u4ee5\u8f15\u9b06\u5730\u9032\u884c\u6578\u64da\u7684\u589e\u522a\u6539\u67e5\uff08CRUD\uff09\u64cd\u4f5c\u3002<\/p>\n
\u5275\u5efa\u6578\u64da<\/h4>\n
new_blog = Blog(title=\"\u6211\u7684\u7b2c\u4e00\u7bc7\u535a\u5ba2\", content=\"\u9019\u662f\u5167\u5bb9\")\nnew_blog.save()\n<\/code><\/pre>\n
\u67e5\u8a62\u6578\u64da<\/h4>\n
all_blogs = Blog.objects.all()  # \u7372\u53d6\u6240\u6709\u535a\u5ba2\nspecific_blog = Blog.objects.get(id=1)  # \u6839\u64daID\u7372\u53d6\u7279\u5b9a\u535a\u5ba2\n<\/code><\/pre>\n
\u66f4\u65b0\u6578\u64da<\/h4>\n
blog_to_update = Blog.objects.get(id=1)\nblog_to_update.title = \"\u66f4\u65b0\u5f8c\u7684\u6a19\u984c\"\nblog_to_update.save()\n<\/code><\/pre>\n
\u522a\u9664\u6578\u64da<\/h4>\n
blog_to_delete = Blog.objects.get(id=1)\nblog_to_delete.delete()\n<\/code><\/pre>\n
\u6578\u64da\u5eab\u9077\u79fb<\/h2>\n
\u5728\u958b\u767c\u904e\u7a0b\u4e2d\uff0c\u6578\u64da\u6a21\u578b\u53ef\u80fd\u6703\u767c\u751f\u8b8a\u5316\u3002Django\u63d0\u4f9b\u4e86\u6578\u64da\u5eab\u9077\u79fb\u7684\u529f\u80fd\uff0c\u5e6b\u52a9\u958b\u767c\u8005\u8f15\u9b06\u7ba1\u7406\u6578\u64da\u5eab\u7d50\u69cb\u7684\u8b8a\u66f4\u3002<\/p>\n
\u5275\u5efa\u9077\u79fb<\/h3>\n
python manage.py makemigrations\n<\/code><\/pre>\n
\u61c9\u7528\u9077\u79fb<\/h3>\n
python manage.py migrate\n<\/code><\/pre>\n
\u9019\u4e9b\u547d\u4ee4\u5c07\u6839\u64da\u6a21\u578b\u7684\u8b8a\u66f4\u81ea\u52d5\u751f\u6210\u548c\u61c9\u7528\u76f8\u61c9\u7684\u6578\u64da\u5eab\u9077\u79fb\uff0c\u78ba\u4fdd\u6578\u64da\u5eab\u7d50\u69cb\u8207\u6a21\u578b\u4fdd\u6301\u4e00\u81f4\u3002<\/p>\n
\u6578\u64da\u5eab\u67e5\u8a62\u512a\u5316<\/h2>\n
\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\uff0c\u67e5\u8a62\u6027\u80fd\u81f3\u95dc\u91cd\u8981\u3002Django\u63d0\u4f9b\u4e86\u4e00\u4e9b\u5de5\u5177\u4f86\u512a\u5316\u67e5\u8a62\u3002<\/p>\n
\u4f7f\u7528\u9078\u64c7\u6027\u67e5\u8a62<\/h3>\n
\u4f7f\u7528`only()`\u548c`defer()`\u65b9\u6cd5\u53ef\u4ee5\u9078\u64c7\u6027\u5730\u52a0\u8f09\u5b57\u6bb5\uff0c\u5f9e\u800c\u6e1b\u5c11\u6578\u64da\u5eab\u7684\u8ca0\u64d4\u3002<\/p>\n
blogs = Blog.objects.only('title')  # \u53ea\u52a0\u8f09\u6a19\u984c\u5b57\u6bb5\n<\/code><\/pre>\n
\u4f7f\u7528\u805a\u5408\u548c\u6ce8\u91cb<\/h3>\n
Django\u7684`aggregate()`\u548c`annotate()`\u65b9\u6cd5\u53ef\u4ee5\u7528\u4f86\u9032\u884c\u6578\u64da\u7684\u805a\u5408\u8a08\u7b97\uff0c\u9019\u6a23\u53ef\u4ee5\u5728\u6578\u64da\u5eab\u5c64\u9762\u9032\u884c\u8a08\u7b97\uff0c\u6e1b\u5c11\u6578\u64da\u50b3\u8f38\u3002<\/p>\n
from django.db.models import Count\n\nblog_count = Blog.objects.aggregate(total=Count('id'))\n<\/code><\/pre>\n
\u7d50\u8ad6<\/h2>\n
\u901a\u904eDjango\u7684ORM\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u9ad8\u6548\u5730\u64cd\u4f5c\u6578\u64da\u5eab\uff0c\u8f15\u9b06\u69cb\u5efa\u7db2\u7ad9\u3002\u7121\u8ad6\u662f\u6578\u64da\u7684\u589e\u522a\u6539\u67e5\uff0c\u9084\u662f\u6578\u64da\u5eab\u7684\u9077\u79fb\u548c\u67e5\u8a62\u512a\u5316\uff0cDjango\u90fd\u63d0\u4f9b\u4e86\u5f37\u5927\u7684\u652f\u6301\u3002\u9019\u4f7f\u5f97\u958b\u767c\u8005\u80fd\u5920\u5c08\u6ce8\u65bc\u696d\u52d9\u908f\u8f2f\uff0c\u800c\u4e0d\u5fc5\u904e\u591a\u95dc\u6ce8\u5e95\u5c64\u7684\u6578\u64da\u5eab\u64cd\u4f5c\u3002<\/p>\n
\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u7a69\u5b9a\u7684 VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u90e8\u7f72\u60a8\u7684Django\u61c9\u7528\uff0cServer.HK\u63d0\u4f9b\u4e86\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u7684\u7528\u6236\u3002\u7121\u8ad6\u662f \u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u985e\u578b\u7684 \u4f3a\u670d\u5668<\/a>\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u63a2\u7d22Django\u5982\u4f55\u9ad8\u6548\u64cd\u4f5c\u6578\u64da\u5eab\uff0c\u8f15\u9b06\u5feb\u6377\u5730\u69cb\u5efa\u7db2\u7ad9\uff0c\u63d0\u5347\u958b\u767c\u6548\u7387\u8207\u6027\u80fd\u3002<\/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-61189","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/61189","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=61189"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/61189\/revisions"}],"predecessor-version":[{"id":61190,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/61189\/revisions\/61190"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=61189"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=61189"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=61189"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}