1.\u5e38\u7528\u53c2\u6570\u9009\u9879<\/strong>
\nnull<\/span>\uff1a\u5982\u679c\u4e3a True\uff0c\u5f53\u8be5\u5b57\u6bb5\u4e3a\u7a7a\u65f6\uff0cDjango \u4f1a\u5c06\u6570\u636e\u5e93\u4e2d\u8be5\u5b57\u6bb5\u8bbe\u7f6e\u4e3a NULL\u3002\u9ed8\u8ba4\u4e3a False \u3002<\/p>\n

blank<\/span>\uff1a\u5982\u679c\u8bbe\u7f6e\u4e3a True\uff0c\u8be5\u5b57\u6bb5\u5141\u8bb8\u4e3a\u7a7a\u3002\u9ed8\u8ba4\u4e3a False\u3002<\/p>\n

null \u9009\u9879\u4ec5\u4ec5\u662f\u6570\u636e\u5e93\u5c42\u9762\u7684\u8bbe\u7f6e\uff0c\u7136\u800c blank\u662f\u6d89\u53ca\u8868\u5355\u9a8c\u8bc1\u65b9\u9762\u3002\u5982\u679c\u4e00\u4e2a\u5b57\u6bb5\u8bbe\u7f6e\u4e3a blank=True \uff0c\u5728\u8fdb\u884c\u8868\u5355\u9a8c\u8bc1\u65f6\uff0c\u63a5\u6536\u7684\u6570\u636e\u8be5\u5b57\u6bb5\u503c\u5141\u8bb8\u4e3a\u7a7a\uff0c\u800c\u8bbe\u7f6e\u4e3a blank=False \u65f6\uff0c\u4e0d\u5141\u8bb8\u4e3a\u7a7a\u3002<\/p>\n

help_text<\/span>\uff1a\u989d\u5916\u7684\u201c\u5e2e\u52a9\u201d\u6587\u672c\uff0c\u968f\u8868\u5355\u63a7\u4ef6\u4e00\u540c\u663e\u793a\u3002\u5373\u4fbf\u4f60\u7684\u5b57\u6bb5\u672a\u7528\u4e8e\u8868\u5355\uff0c\u5b83\u5bf9\u4e8e\u751f\u6210\u6587\u6863\u4e5f\u662f\u5f88\u6709\u7528\u7684\u3002<\/p>\n

primary_key<\/span>\uff1a\u5982\u679c\u8bbe\u7f6e\u4e3a True \uff0c\u5c06\u8be5\u5b57\u6bb5\u8bbe\u7f6e\u4e3a\u8be5\u6a21\u578b\u7684\u4e3b\u952e\u3002<\/p>\n

\u5728\u4e00\u4e2a\u6a21\u578b\u4e2d\uff0c\u5982\u679c\u4f60\u6ca1\u6709\u5bf9\u4efb\u4f55\u4e00\u4e2a\u5b57\u6bb5\u8bbe\u7f6e primary_key=True \u9009\u9879\u3002 Django \u4f1a\u81ea\u52a8\u6dfb\u52a0\u4e00\u4e2a IntegerField \u5b57\u6bb5\uff0c\u5e76\u8bbe\u7f6e\u4e3a\u4e3b\u952e\uff0c\u4e3b\u952e\u5b57\u6bb5\u662f\u53ea\u53ef\u8bfb\u7684\u3002<\/p>\n

verbose_name<\/span>\uff1a\u5b57\u6bb5\u5907\u6ce8\u540d\uff0c\u4e3a\u8bbe\u7f6e\uff0cdjango\u4f1a\u5c06\u5b57\u6bb5\u7684\u4e0b\u5212\u7ebf\u8f6c\u6362\u4e3a\u7a7a\u683c\u505a\u4e3a\u5907\u6ce8<\/p>\n

2.\u5173\u8054\u5173\u7cfb<\/strong>
\nForeignKey<\/span>\uff1a\u4e00\u5bf9\u591a<\/p>\n

3.Meta\u9009\u9879<\/strong>
\n\u6a21\u578b\u7684\u5143\u6570\u636e\u5373\u201c\u6240\u6709\u4e0d\u662f\u5b57\u6bb5\u7684\u4e1c\u897f\u201d\uff0c\u6bd4\u5982\u6392\u5e8f\u9009\u9879\uff08 ordering \uff09\uff0c\u6570\u636e\u5e93\u8868\u540d\uff08 db_table \uff09\uff0c\u6216\u662f\u9605\u8bfb\u53cb\u597d\u7684\u5355\u590d\u6570\u540d\uff08 verbose_name \u548c verbose_name_plural \uff09\u3002\u8fd9\u4e9b\u90fd\u4e0d\u662f\u5fc5\u987b\u7684\uff0c\u5e76\u4e14\u5728\u6a21\u578b\u5f53\u4e2d\u6dfb\u52a0 Meta\u7c7b \u4e5f\u5b8c\u5168\u662f\u53ef\u9009\u7684\u3002<\/p>\n

4.\u6a21\u578b\u65b9\u6cd5<\/strong>
\n1.__str__()\uff1a\u8fd4\u56de\u53cb\u597d\u7684\u5bf9\u8c61\u6253\u5370\u503c<\/p>\n

\u62bd\u8c61\u57fa\u7c7b\u5728\u4f60\u8981\u5c06\u516c\u5171\u4fe1\u606f\u653e\u5165\u5f88\u591a\u6a21\u578b\u65f6\u4f1a\u5f88\u6709\u7528\u3002\u7f16\u5199\u4f60\u7684\u57fa\u7c7b\uff0c\u5e76\u5728 Meta \u7c7b\u4e2d\u586b\u5165 abstract=True\u3002\u8be5\u6a21\u578b\u5c06\u4e0d\u4f1a\u521b\u5efa\u4efb\u4f55\u6570\u636e\u8868\u3002\u5f53\u5176\u7528\u4f5c\u5176\u5b83\u6a21\u578b\u7c7b\u7684\u57fa\u7c7b\u65f6\uff0c\u5b83\u7684\u5b57\u6bb5\u4f1a\u81ea\u52a8\u6dfb\u52a0\u81f3\u5b50\u7c7b\u3002<\/span><\/p>\n

\n
Code: <\/strong>[\u5168\u9009]<\/a> [Expand\/Collapse]<\/a><\/div>\n
\n
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from<\/span> django.db<\/span> import<\/span> models<\/div>\n<\/li>\n
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<\/div>\n<\/li>\n
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class<\/span> CommonInfo(<\/span>models.Model<\/span>)<\/span>:<\/div>\n<\/li>\n
\n
name =<\/span> models.CharField<\/span>(<\/span>max_length=<\/span>100<\/span>)<\/span><\/div>\n<\/li>\n
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age =<\/span> models.PositiveIntegerField<\/span>(<\/span>)<\/span><\/div>\n<\/li>\n
\n
<\/div>\n<\/li>\n
\n
class<\/span> Meta:<\/div>\n<\/li>\n
\n
abstract =<\/span> True<\/span><\/div>\n<\/li>\n
\n
<\/div>\n<\/li>\n
\n
class<\/span> Student(<\/span>CommonInfo)<\/span>:<\/div>\n<\/li>\n
\n
home_group =<\/span> models.CharField<\/span>(<\/span>max_length=<\/span>5<\/span>)<\/span><\/div>\n<\/li>\n<\/ol>\n<\/div>\n<\/div>\n<\/div>\n
GeSHi © Codebox Plus Extension<\/div>\n<\/div>\n
[\/size]<\/p>\n
\u539f\u6587\u4f5c\u8005: BG6RSH | \u67e5\u770b\u539f\u5e16<\/a><\/small><\/p>\n","protected":false},"excerpt":{"rendered":"
1.\u5e38\u7528\u53c2\u6570\u9009\u9879 null\uff1a\u5982\u679c\u4e3a True\uff0c\u5f53\u8be5\u5b57\u6bb5\u4e3a\u7a7a\u65f6\uff0cDjango \u4f1a\u5c06 … \u7ee7\u7eed\u9605\u8bfb →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[105],"tags":[],"class_list":["post-1443","post","type-post","status-publish","format-standard","hentry","category-105"],"_links":{"self":[{"href":"https:\/\/www.tansoo.cn\/index.php?rest_route=\/wp\/v2\/posts\/1443","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.tansoo.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.tansoo.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.tansoo.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.tansoo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1443"}],"version-history":[{"count":0,"href":"https:\/\/www.tansoo.cn\/index.php?rest_route=\/wp\/v2\/posts\/1443\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.tansoo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1443"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.tansoo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1443"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.tansoo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1443"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}