{"id":77922,"date":"2024-10-16T11:20:42","date_gmt":"2024-10-16T03:20:42","guid":{"rendered":"https:\/\/server.hk\/cnblog\/77922\/"},"modified":"2024-10-16T11:20:42","modified_gmt":"2024-10-16T03:20:42","slug":"mysql%e6%8c%87%e4%bb%a4-column_key%ef%bc%88%e5%88%97%e9%8d%b5%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/77922\/","title":{"rendered":"MySQL\u6307\u4ee4: COLUMN_KEY\uff08\u5217\u9375\uff09"},"content":{"rendered":"<h1 id=\"mysql%e6%8c%87%e4%bb%a4-column_key%ef%bc%88%e5%88%97%e9%8d%b5%ef%bc%89-ZQswlGWxbn\">MySQL\u6307\u4ee4: COLUMN_KEY\uff08\u5217\u9375\uff09<\/h1>\n<p>\u5728MySQL\u8cc7\u6599\u5eab\u4e2d\uff0cCOLUMN_KEY\u662f\u7528\u4f86\u6307\u793a\u67d0\u4e00\u5217\u662f\u5426\u70ba\u9375\u7684\u5c6c\u6027\u3002\u9019\u500b\u5c6c\u6027\u5c0d\u65bc\u8cc7\u6599\u5eab\u7684\u8a2d\u8a08\u548c\u67e5\u8a62\u6027\u80fd\u6709\u8457\u91cd\u8981\u7684\u5f71\u97ff\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eCOLUMN_KEY\u7684\u6982\u5ff5\u3001\u7528\u9014\u53ca\u5176\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u4e2d\u7684\u91cd\u8981\u6027\u3002<\/p>\n<h2 id=\"column_key%e7%9a%84%e5%ae%9a%e7%be%a9-ZQswlGWxbn\">COLUMN_KEY\u7684\u5b9a\u7fa9<\/h2>\n<p>COLUMN_KEY\u662fMySQL\u8cc7\u6599\u8868\u7d50\u69cb\u4e2d\u7684\u4e00\u500b\u5c6c\u6027\uff0c\u4e3b\u8981\u7528\u4f86\u6a19\u8b58\u67d0\u4e00\u5217\u662f\u5426\u70ba\u7d22\u5f15\u9375\u3002\u9019\u4e9b\u9375\u53ef\u4ee5\u662f\u4e3b\u9375\u3001\u552f\u4e00\u9375\u6216\u666e\u901a\u7d22\u5f15\u3002\u900f\u904eCOLUMN_KEY\uff0c\u4f7f\u7528\u8005\u53ef\u4ee5\u5feb\u901f\u4e86\u89e3\u8cc7\u6599\u8868\u4e2d\u5404\u5217\u7684\u7d22\u5f15\u72c0\u614b\uff0c\u9019\u5c0d\u65bc\u512a\u5316\u67e5\u8a62\u6027\u80fd\u81f3\u95dc\u91cd\u8981\u3002<\/p>\n<h2 id=\"column_key%e7%9a%84%e9%a1%9e%e5%9e%8b-ZQswlGWxbn\">COLUMN_KEY\u7684\u985e\u578b<\/h2>\n<p>\u5728MySQL\u4e2d\uff0cCOLUMN_KEY\u7684\u503c\u53ef\u4ee5\u662f\u4ee5\u4e0b\u5e7e\u7a2e\uff1a<\/p>\n<ul>\n<li><strong>PRI<\/strong>\uff1a\u8868\u793a\u8a72\u5217\u662f\u4e3b\u9375\uff08Primary Key\uff09\u3002\u4e3b\u9375\u662f\u552f\u4e00\u6a19\u8b58\u8cc7\u6599\u8868\u4e2d\u6bcf\u4e00\u884c\u7684\u5217\uff0c\u4e26\u4e14\u4e0d\u5141\u8a31\u6709\u7a7a\u503c\u3002<\/li>\n<li><strong>UNI<\/strong>\uff1a\u8868\u793a\u8a72\u5217\u662f\u552f\u4e00\u9375\uff08Unique Key\uff09\u3002\u552f\u4e00\u9375\u4e5f\u8981\u6c42\u8a72\u5217\u7684\u503c\u5fc5\u9808\u552f\u4e00\uff0c\u4f46\u5141\u8a31\u6709\u7a7a\u503c\u3002<\/li>\n<li><strong>MUL<\/strong>\uff1a\u8868\u793a\u8a72\u5217\u662f\u666e\u901a\u7d22\u5f15\uff08Multiple Key\uff09\u3002\u9019\u610f\u5473\u8457\u8a72\u5217\u53ef\u4ee5\u6709\u91cd\u8907\u7684\u503c\uff0c\u4e26\u4e14\u53ef\u4ee5\u7528\u65bc\u52a0\u901f\u67e5\u8a62\u3002<\/li>\n<li><strong>NULL<\/strong>\uff1a\u8868\u793a\u8a72\u5217\u4e0d\u662f\u4efb\u4f55\u985e\u578b\u7684\u9375\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e6%9f%a5%e8%a9%a2column_key-ZQswlGWxbn\">\u5982\u4f55\u67e5\u8a62COLUMN_KEY<\/h2>\n<p>\u8981\u67e5\u8a62\u67d0\u4e00\u8cc7\u6599\u8868\u7684COLUMN_KEY\u5c6c\u6027\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u6307\u4ee4\uff1a<\/p>\n<pre><code>SHOW COLUMNS FROM your_table_name;<\/code><\/pre>\n<p>\u9019\u500b\u6307\u4ee4\u6703\u8fd4\u56de\u8cc7\u6599\u8868\u4e2d\u6240\u6709\u5217\u7684\u8a73\u7d30\u8cc7\u8a0a\uff0c\u5305\u62ecCOLUMN_KEY\u7684\u503c\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>SHOW COLUMNS FROM users;<\/code><\/pre>\n<p>\u57f7\u884c\u5f8c\u7684\u7d50\u679c\u53ef\u80fd\u5982\u4e0b\uff1a<\/p>\n<pre><code>Field      | Type         | Null | Key | Default | Extra\n-----------|--------------|------|-----|---------|-------\nid         | int(11)     | NO   | PRI | NULL    | auto_increment\nusername   | varchar(50) | NO   | UNI | NULL    | \nemail      | varchar(100)| NO   | UNI | NULL    | \ncreated_at | datetime    | NO   |     | NULL    | \n<\/code><\/pre>\n<p>\u5f9e\u4e0a\u9762\u7684\u7d50\u679c\u53ef\u4ee5\u770b\u51fa\uff0cid\u5217\u662f\u4e3b\u9375\uff0cusername\u548cemail\u5217\u662f\u552f\u4e00\u9375\uff0c\u800ccreated_at\u5217\u5247\u4e0d\u662f\u4efb\u4f55\u9375\u3002<\/p>\n<h2 id=\"column_key%e7%9a%84%e6%87%89%e7%94%a8-ZQswlGWxbn\">COLUMN_KEY\u7684\u61c9\u7528<\/h2>\n<p>\u5728\u8cc7\u6599\u5eab\u8a2d\u8a08\u4e2d\uff0c\u5408\u7406\u4f7f\u7528COLUMN_KEY\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002\u4f8b\u5982\uff0c\u5c0d\u65bc\u7d93\u5e38\u7528\u65bc\u67e5\u8a62\u7684\u5217\uff0c\u61c9\u8003\u616e\u8a2d\u7f6e\u7d22\u5f15\u3002\u9019\u6a23\u53ef\u4ee5\u52a0\u901f\u67e5\u8a62\u904e\u7a0b\uff0c\u6e1b\u5c11\u8cc7\u6599\u5eab\u7684\u8ca0\u64d4\u3002<\/p>\n<p>\u6b64\u5916\uff0c\u4f7f\u7528\u4e3b\u9375\u548c\u552f\u4e00\u9375\u53ef\u4ee5\u78ba\u4fdd\u8cc7\u6599\u7684\u5b8c\u6574\u6027\uff0c\u907f\u514d\u91cd\u8907\u6578\u64da\u7684\u51fa\u73fe\u3002\u9019\u5c0d\u65bc\u7dad\u8b77\u8cc7\u6599\u5eab\u7684\u5065\u5eb7\u72c0\u614b\u81f3\u95dc\u91cd\u8981\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-ZQswlGWxbn\">\u7e3d\u7d50<\/h2>\n<p>COLUMN_KEY\u5728MySQL\u8cc7\u6599\u5eab\u4e2d\u626e\u6f14\u8457\u91cd\u8981\u7684\u89d2\u8272\uff0c\u5e6b\u52a9\u4f7f\u7528\u8005\u4e86\u89e3\u8cc7\u6599\u8868\u4e2d\u5404\u5217\u7684\u7d22\u5f15\u72c0\u614b\u3002\u900f\u904e\u5408\u7406\u7684\u8a2d\u8a08\u548c\u4f7f\u7528COLUMN_KEY\uff0c\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u4e26\u78ba\u4fdd\u8cc7\u6599\u7684\u5b8c\u6574\u6027\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u80fd\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u6216<a href=\"https:\/\/server.hk\">\u4f3a\u670d\u5668<\/a>\u89e3\u6c7a\u65b9\u6848\u5c07\u662f\u660e\u667a\u7684\u9078\u64c7\u3002\u4e86\u89e3COLUMN_KEY\u7684\u904b\u7528\uff0c\u5c07\u6709\u52a9\u65bc\u66f4\u597d\u5730\u7ba1\u7406\u548c\u512a\u5316\u60a8\u7684\u8cc7\u6599\u5eab\u7cfb\u7d71\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u4e2d\u7684COLUMN_KEY\uff08\u5217\u9375\uff09\u6307\u4ee4\uff0c\u638c\u63e1\u5982\u4f55\u8b58\u5225\u548c\u7ba1\u7406\u6578\u64da\u8868\u4e2d\u7684\u4e3b\u9375\u548c\u7d22\u5f15\uff0c\u63d0\u5347\u6578\u64da\u5eab\u6027\u80fd\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-77922","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/77922","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=77922"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/77922\/revisions"}],"predecessor-version":[{"id":77923,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/77922\/revisions\/77923"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=77922"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=77922"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=77922"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}