{"id":178950,"date":"2024-11-08T21:45:29","date_gmt":"2024-11-08T13:45:29","guid":{"rendered":"https:\/\/server.hk\/cnblog\/178950\/"},"modified":"2024-11-08T21:45:30","modified_gmt":"2024-11-08T13:45:30","slug":"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9postgresql%e9%8c%af%e8%aa%a4%e4%bb%a3%e7%a2%bc%ef%bc%9a39004-null_value_not_allowed%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/178950\/","title":{"rendered":"\u5982\u4f55\u4fee\u5fa9PostgreSQL\u932f\u8aa4\u4ee3\u78bc\uff1a39004 &#8211; null_value_not_allowed\uff1f"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e4%bf%ae%e5%be%a9postgresql%e9%8c%af%e8%aa%a4%e4%bb%a3%e7%a2%bc%ef%bc%9a39004-null_value_not_allowed%ef%bc%9f-gabgkbHySy\">\u5982\u4f55\u4fee\u5fa9PostgreSQL\u932f\u8aa4\u4ee3\u78bc\uff1a39004 &#8211; null_value_not_allowed\uff1f<\/h1>\n<p>\u5728\u4f7f\u7528PostgreSQL\u6578\u64da\u5eab\u6642\uff0c\u958b\u767c\u8005\u53ef\u80fd\u6703\u9047\u5230\u5404\u7a2e\u932f\u8aa4\u4ee3\u78bc\uff0c\u5176\u4e2d\u4e4b\u4e00\u5c31\u662f39004 &#8211; null_value_not_allowed\u3002\u9019\u500b\u932f\u8aa4\u901a\u5e38\u8868\u793a\u5728\u67d0\u500b\u4e0d\u5141\u8a31\u70ba\u7a7a\u7684\u6b04\u4f4d\u4e2d\u63d2\u5165\u4e86null\u503c\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u9019\u500b\u932f\u8aa4\u7684\u539f\u56e0\u53ca\u5176\u89e3\u6c7a\u65b9\u6848\uff0c\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u6709\u6548\u5730\u8655\u7406\u6b64\u554f\u984c\u3002<\/p>\n<h2 id=\"%e9%8c%af%e8%aa%a4%e4%bb%a3%e7%a2%bc39004%e7%9a%84%e8%83%8c%e6%99%af-gabgkbHySy\">\u932f\u8aa4\u4ee3\u78bc39004\u7684\u80cc\u666f<\/h2>\n<p>PostgreSQL\u662f\u4e00\u500b\u5f37\u5927\u7684\u958b\u6e90\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u5ee3\u6cdb\u61c9\u7528\u65bc\u5404\u7a2e\u61c9\u7528\u7a0b\u5e8f\u4e2d\u3002\u7576\u4f60\u5617\u8a66\u5728\u4e00\u500b\u4e0d\u5141\u8a31\u7a7a\u503c\u7684\u6b04\u4f4d\u4e2d\u63d2\u5165null\u503c\u6642\uff0cPostgreSQL\u6703\u8fd4\u56de\u932f\u8aa4\u4ee3\u78bc39004\u3002\u9019\u901a\u5e38\u767c\u751f\u5728\u4ee5\u4e0b\u60c5\u6cc1\uff1a<\/p>\n<ul>\n<li>\u5728\u5275\u5efa\u8868\u6642\uff0c\u67d0\u4e9b\u6b04\u4f4d\u88ab\u5b9a\u7fa9\u70baNOT NULL\u3002<\/li>\n<li>\u5728\u63d2\u5165\u6216\u66f4\u65b0\u6578\u64da\u6642\uff0c\u672a\u63d0\u4f9b\u5fc5\u8981\u7684\u6b04\u4f4d\u503c\u3002<\/li>\n<li>\u5728\u4f7f\u7528\u51fd\u6578\u6216\u89f8\u767c\u5668\u6642\uff0c\u672a\u6b63\u78ba\u8655\u7406null\u503c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e8%ad%98%e5%88%a5%e5%95%8f%e9%a1%8c-gabgkbHySy\">\u5982\u4f55\u8b58\u5225\u554f\u984c<\/h2>\n<p>\u8981\u4fee\u5fa9\u9019\u500b\u932f\u8aa4\uff0c\u9996\u5148\u9700\u8981\u78ba\u5b9a\u662f\u54ea\u500b\u6b04\u4f4d\u5c0e\u81f4\u4e86\u554f\u984c\u3002\u53ef\u4ee5\u901a\u904e\u4ee5\u4e0b\u6b65\u9a5f\u4f86\u8b58\u5225\u554f\u984c\uff1a<\/p>\n<ol>\n<li>\u6aa2\u67e5\u932f\u8aa4\u6d88\u606f\uff1aPostgreSQL\u7684\u932f\u8aa4\u6d88\u606f\u901a\u5e38\u6703\u6307\u660e\u5177\u9ad4\u7684\u6b04\u4f4d\u540d\u7a31\u3002<\/li>\n<li>\u67e5\u770b\u8868\u7d50\u69cb\uff1a\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\u67e5\u770b\u8868\u7684\u7d50\u69cb\uff0c\u78ba\u5b9a\u54ea\u4e9b\u6b04\u4f4d\u88ab\u8a2d\u7f6e\u70baNOT NULL\u3002<\/li>\n<\/ol>\n<pre><code>SELECT column_name, is_nullable \nFROM information_schema.columns \nWHERE table_name = 'your_table_name';<\/code><\/pre>\n<h2 id=\"%e4%bf%ae%e5%be%a9%e6%96%b9%e6%b3%95-gabgkbHySy\">\u4fee\u5fa9\u65b9\u6cd5<\/h2>\n<p>\u4e00\u65e6\u78ba\u5b9a\u4e86\u554f\u984c\u7684\u6839\u6e90\uff0c\u63a5\u4e0b\u4f86\u53ef\u4ee5\u63a1\u53d6\u4ee5\u4e0b\u5e7e\u7a2e\u65b9\u6cd5\u4f86\u4fee\u5fa9\u932f\u8aa4\uff1a<\/p>\n<h3 id=\"1-%e6%8f%90%e4%be%9b%e5%bf%85%e8%a6%81%e7%9a%84%e5%80%bc-gabgkbHySy\">1. \u63d0\u4f9b\u5fc5\u8981\u7684\u503c<\/h3>\n<p>\u6700\u76f4\u63a5\u7684\u89e3\u6c7a\u65b9\u6848\u662f\u78ba\u4fdd\u5728\u63d2\u5165\u6216\u66f4\u65b0\u6578\u64da\u6642\uff0c\u70ba\u6240\u6709NOT NULL\u6b04\u4f4d\u63d0\u4f9b\u6709\u6548\u7684\u503c\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>INSERT INTO your_table_name (column1, column2) \nVALUES ('value1', 'value2');<\/code><\/pre>\n<h3 id=\"2-%e4%bf%ae%e6%94%b9%e8%a1%a8%e7%b5%90%e6%a7%8b-gabgkbHySy\">2. \u4fee\u6539\u8868\u7d50\u69cb<\/h3>\n<p>\u5982\u679c\u67d0\u500b\u6b04\u4f4d\u4e0d\u61c9\u8a72\u662fNOT NULL\uff0c\u53ef\u4ee5\u8003\u616e\u4fee\u6539\u8868\u7d50\u69cb\uff0c\u5c07\u8a72\u6b04\u4f4d\u7684\u7d04\u675f\u689d\u4ef6\u66f4\u6539\u70ba\u5141\u8a31null\u503c\u3002\u9019\u53ef\u4ee5\u901a\u904e\u4ee5\u4e0bSQL\u8a9e\u53e5\u5be6\u73fe\uff1a<\/p>\n<pre><code>ALTER TABLE your_table_name \nALTER COLUMN column_name DROP NOT NULL;<\/code><\/pre>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8%e9%a0%90%e8%a8%ad%e5%80%bc-gabgkbHySy\">3. \u4f7f\u7528\u9810\u8a2d\u503c<\/h3>\n<p>\u5982\u679c\u67d0\u500b\u6b04\u4f4d\u7d93\u5e38\u6703\u7f3a\u5c11\u503c\uff0c\u53ef\u4ee5\u8003\u616e\u70ba\u8a72\u6b04\u4f4d\u8a2d\u7f6e\u9810\u8a2d\u503c\u3002\u9019\u6a23\u5728\u63d2\u5165\u6578\u64da\u6642\uff0c\u5982\u679c\u672a\u63d0\u4f9b\u8a72\u6b04\u4f4d\u7684\u503c\uff0c\u7cfb\u7d71\u5c07\u81ea\u52d5\u4f7f\u7528\u9810\u8a2d\u503c\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>ALTER TABLE your_table_name \nALTER COLUMN column_name SET DEFAULT 'default_value';<\/code><\/pre>\n<h2 id=\"%e6%9c%80%e4%bd%b3%e5%af%a6%e8%b8%90-gabgkbHySy\">\u6700\u4f73\u5be6\u8e10<\/h2>\n<p>\u70ba\u4e86\u907f\u514d\u672a\u4f86\u518d\u6b21\u51fa\u73fe39004\u932f\u8aa4\uff0c\u5efa\u8b70\u9075\u5faa\u4ee5\u4e0b\u6700\u4f73\u5be6\u8e10\uff1a<\/p>\n<ul>\n<li>\u5728\u8a2d\u8a08\u6578\u64da\u5eab\u6642\uff0c\u4ed4\u7d30\u8003\u616e\u6bcf\u500b\u6b04\u4f4d\u7684\u7d04\u675f\u689d\u4ef6\u3002<\/li>\n<li>\u5728\u63d2\u5165\u6216\u66f4\u65b0\u6578\u64da\u4e4b\u524d\uff0c\u6aa2\u67e5\u6240\u6709\u5fc5\u8981\u7684\u6b04\u4f4d\u662f\u5426\u5df2\u63d0\u4f9b\u503c\u3002<\/li>\n<li>\u4f7f\u7528\u4e8b\u52d9\u4f86\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\uff0c\u907f\u514d\u90e8\u5206\u66f4\u65b0\u5c0e\u81f4\u7684\u932f\u8aa4\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-gabgkbHySy\">\u7e3d\u7d50<\/h2>\n<p>PostgreSQL\u932f\u8aa4\u4ee3\u78bc39004 &#8211; null_value_not_allowed\u901a\u5e38\u662f\u7531\u65bc\u5728\u4e0d\u5141\u8a31\u7a7a\u503c\u7684\u6b04\u4f4d\u4e2d\u63d2\u5165\u4e86null\u503c\u6240\u5f15\u8d77\u7684\u3002\u901a\u904e\u6aa2\u67e5\u932f\u8aa4\u6d88\u606f\u3001\u67e5\u770b\u8868\u7d50\u69cb\u4ee5\u53ca\u63d0\u4f9b\u5fc5\u8981\u7684\u503c\u6216\u4fee\u6539\u8868\u7d50\u69cb\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u4fee\u5fa9\u6b64\u932f\u8aa4\u3002\u9075\u5faa\u6700\u4f73\u5be6\u8e10\u5c07\u6709\u52a9\u65bc\u6e1b\u5c11\u672a\u4f86\u51fa\u73fe\u985e\u4f3c\u554f\u984c\u7684\u6a5f\u6703\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u7a69\u5b9a\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK\u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\u4ee5\u6eff\u8db3\u60a8\u7684\u9700\u6c42\uff0c\u7121\u8ad6\u662f\u6578\u64da\u5eab\u7ba1\u7406\u9084\u662f\u61c9\u7528\u7a0b\u5e8f\u90e8\u7f72\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u4fee\u5fa9PostgreSQL\u932f\u8aa4\u4ee3\u78bc39004\uff1anull_value_not_allowed\uff0c\u89e3\u6c7a\u6578\u64da\u5eab\u4e2d\u7684\u7a7a\u503c\u554f\u984c\uff0c\u78ba\u4fdd\u6578\u64da\u5b8c\u6574\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-178950","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/178950","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=178950"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/178950\/revisions"}],"predecessor-version":[{"id":178951,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/178950\/revisions\/178951"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=178950"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=178950"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=178950"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}