{"id":77986,"date":"2024-10-16T11:22:15","date_gmt":"2024-10-16T03:22:15","guid":{"rendered":"https:\/\/server.hk\/cnblog\/77986\/"},"modified":"2024-10-16T11:22:15","modified_gmt":"2024-10-16T03:22:15","slug":"mysql%e6%8c%87%e4%bb%a4-comment%ef%bc%88%e6%b3%a8%e9%87%8b%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/77986\/","title":{"rendered":"MySQL\u6307\u4ee4: COMMENT\uff08\u6ce8\u91cb\uff09"},"content":{"rendered":"<h1 id=\"mysql%e6%8c%87%e4%bb%a4-comment%ef%bc%88%e6%b3%a8%e9%87%8b%ef%bc%89-LqxjlGNrrj\">MySQL\u6307\u4ee4: COMMENT\uff08\u6ce8\u91cb\uff09<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u826f\u597d\u7684\u8a3b\u89e3\u7fd2\u6163\u5c0d\u65bc\u7dad\u8b77\u548c\u7406\u89e3\u4ee3\u78bc\u81f3\u95dc\u91cd\u8981\u3002MySQL\u4f5c\u70ba\u4e00\u500b\u6d41\u884c\u7684\u958b\u6e90\u8cc7\u6599\u5eab\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u65b9\u5f0f\u4f86\u6dfb\u52a0\u8a3b\u89e3\uff0c\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u548c\u8cc7\u6599\u5eab\u7ba1\u7406\u54e1\u66f4\u597d\u5730\u7406\u89e3\u8cc7\u6599\u5eab\u7d50\u69cb\u548c\u908f\u8f2f\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eMySQL\u4e2d\u7684COMMENT\u6307\u4ee4\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u7bc4\u4f8b\u548c\u4f7f\u7528\u5efa\u8b70\u3002<\/p>\n<h2 id=\"comment%e6%8c%87%e4%bb%a4%e6%a6%82%e8%bf%b0-LqxjlGNrrj\">COMMENT\u6307\u4ee4\u6982\u8ff0<\/h2>\n<p>\u5728MySQL\u4e2d\uff0cCOMMENT\u6307\u4ee4\u4e3b\u8981\u7528\u65bc\u70ba\u8cc7\u6599\u8868\u3001\u6b04\u4f4d\u3001\u7d22\u5f15\u548c\u8cc7\u6599\u5eab\u6dfb\u52a0\u63cf\u8ff0\u6027\u8a3b\u89e3\u3002\u9019\u4e9b\u8a3b\u89e3\u4e0d\u50c5\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u7406\u89e3\u8cc7\u6599\u7d50\u69cb\uff0c\u9084\u53ef\u4ee5\u5728\u751f\u6210\u6587\u4ef6\u6216\u4f7f\u7528\u8cc7\u6599\u5eab\u7ba1\u7406\u5de5\u5177\u6642\u63d0\u4f9b\u984d\u5916\u7684\u4e0a\u4e0b\u6587\u4fe1\u606f\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8comment%e6%8c%87%e4%bb%a4%e7%9a%84%e8%aa%9e%e6%b3%95-LqxjlGNrrj\">\u4f7f\u7528COMMENT\u6307\u4ee4\u7684\u8a9e\u6cd5<\/h2>\n<p>COMMENT\u6307\u4ee4\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>ALTER TABLE table_name \n  MODIFY column_name column_type \n  COMMENT '\u9019\u662f\u8a3b\u89e3';<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c<code>table_name<\/code>\u662f\u8cc7\u6599\u8868\u7684\u540d\u7a31\uff0c<code>column_name<\/code>\u662f\u9700\u8981\u6dfb\u52a0\u8a3b\u89e3\u7684\u6b04\u4f4d\u540d\u7a31\uff0c<code>column_type<\/code>\u662f\u6b04\u4f4d\u7684\u6578\u64da\u985e\u578b\uff0c\u800c\u8a3b\u89e3\u5247\u662f\u7528\u55ae\u5f15\u865f\u62ec\u8d77\u4f86\u7684\u63cf\u8ff0\u6027\u6587\u5b57\u3002<\/p>\n<h2 id=\"%e7%af%84%e4%be%8b-LqxjlGNrrj\">\u7bc4\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u5177\u9ad4\u7684\u7bc4\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u70ba\u8cc7\u6599\u8868\u4e2d\u7684\u6b04\u4f4d\u6dfb\u52a0\u8a3b\u89e3\uff1a<\/p>\n<pre><code>CREATE TABLE users (\n  id INT AUTO_INCREMENT PRIMARY KEY,\n  username VARCHAR(50) NOT NULL COMMENT '\u7528\u6236\u540d',\n  email VARCHAR(100) NOT NULL COMMENT '\u96fb\u5b50\u90f5\u4ef6\u5730\u5740',\n  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP COMMENT '\u5275\u5efa\u6642\u9593'\n);<\/code><\/pre>\n<p>\u5728\u9019\u500b\u7bc4\u4f8b\u4e2d\uff0c\u6211\u5011\u5275\u5efa\u4e86\u4e00\u500b\u540d\u70ba<code>users<\/code>\u7684\u8cc7\u6599\u8868\uff0c\u4e26\u70ba\u6bcf\u500b\u6b04\u4f4d\u6dfb\u52a0\u4e86\u76f8\u61c9\u7684\u8a3b\u89e3\u3002\u9019\u6a23\uff0c\u7576\u5176\u4ed6\u958b\u767c\u8005\u67e5\u770b\u9019\u500b\u8cc7\u6599\u8868\u6642\uff0c\u53ef\u4ee5\u5feb\u901f\u4e86\u89e3\u6bcf\u500b\u6b04\u4f4d\u7684\u7528\u9014\u3002<\/p>\n<h2 id=\"%e6%9f%a5%e8%a9%a2%e8%a8%bb%e8%a7%a3-LqxjlGNrrj\">\u67e5\u8a62\u8a3b\u89e3<\/h2>\n<p>\u8981\u67e5\u770b\u8cc7\u6599\u8868\u6216\u6b04\u4f4d\u7684\u8a3b\u89e3\uff0c\u53ef\u4ee5\u4f7f\u7528<code>SHOW CREATE TABLE<\/code>\u6307\u4ee4\u3002\u9019\u500b\u6307\u4ee4\u6703\u986f\u793a\u8cc7\u6599\u8868\u7684\u5275\u5efa\u8a9e\u53e5\uff0c\u5305\u62ec\u6240\u6709\u7684\u8a3b\u89e3\u4fe1\u606f\uff1a<\/p>\n<pre><code>SHOW CREATE TABLE users;<\/code><\/pre>\n<p>\u57f7\u884c\u9019\u500b\u6307\u4ee4\u5f8c\uff0cMySQL\u6703\u8fd4\u56de<code>users<\/code>\u8cc7\u6599\u8868\u7684\u5275\u5efa\u8a9e\u53e5\uff0c\u4e26\u986f\u793a\u6240\u6709\u6b04\u4f4d\u7684\u8a3b\u89e3\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-LqxjlGNrrj\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<ul>\n<li>\u8a3b\u89e3\u7684\u9577\u5ea6\u6709\u9650\u5236\uff0c\u901a\u5e38\u4e0d\u61c9\u8d85\u904e1024\u500b\u5b57\u7b26\u3002<\/li>\n<li>\u8a3b\u89e3\u4e0d\u6703\u5f71\u97ff\u8cc7\u6599\u8868\u7684\u6027\u80fd\uff0c\u4f46\u826f\u597d\u7684\u8a3b\u89e3\u7fd2\u6163\u53ef\u4ee5\u63d0\u9ad8\u4ee3\u78bc\u7684\u53ef\u8b80\u6027\u548c\u53ef\u7dad\u8b77\u6027\u3002<\/li>\n<li>\u5728\u8a2d\u8a08\u8cc7\u6599\u5eab\u6642\uff0c\u61c9\u8a72\u8003\u616e\u5230\u8a3b\u89e3\u7684\u4f7f\u7528\uff0c\u4ee5\u4fbf\u672a\u4f86\u7684\u958b\u767c\u8005\u80fd\u5920\u5feb\u901f\u7406\u89e3\u8cc7\u6599\u7d50\u69cb\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-LqxjlGNrrj\">\u7e3d\u7d50<\/h2>\n<p>MySQL\u4e2d\u7684COMMENT\u6307\u4ee4\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u548c\u8cc7\u6599\u5eab\u7ba1\u7406\u54e1\u66f4\u597d\u5730\u7406\u89e3\u548c\u7dad\u8b77\u8cc7\u6599\u5eab\u7d50\u69cb\u3002\u901a\u904e\u70ba\u8cc7\u6599\u8868\u548c\u6b04\u4f4d\u6dfb\u52a0\u6e05\u6670\u7684\u8a3b\u89e3\uff0c\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u4ee3\u78bc\u7684\u53ef\u8b80\u6027\u548c\u53ef\u7dad\u8b77\u6027\u3002\u7121\u8ad6\u662f\u5728\u958b\u767c\u65b0\u61c9\u7528\u7a0b\u5e8f\u9084\u662f\u7dad\u8b77\u73fe\u6709\u7cfb\u7d71\u6642\uff0c\u826f\u597d\u7684\u8a3b\u89e3\u7fd2\u6163\u90fd\u662f\u4e0d\u53ef\u6216\u7f3a\u7684\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u9069\u5408\u5404\u7a2e\u9700\u6c42\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u985e\u578b\u7684 <a href=\"https:\/\/server.hk\">\u4f3a\u670d\u5668<\/a>\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u670d\u52d9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u6307\u4ee4COMMENT\u7684\u7528\u6cd5\uff0c\u5982\u4f55\u5728\u6578\u64da\u5eab\u4e2d\u6dfb\u52a0\u6ce8\u91cb\u4ee5\u63d0\u9ad8\u4ee3\u78bc\u53ef\u8b80\u6027\u548c\u7dad\u8b77\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-77986","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/77986","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=77986"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/77986\/revisions"}],"predecessor-version":[{"id":77987,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/77986\/revisions\/77987"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=77986"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=77986"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=77986"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}