{"id":78338,"date":"2024-10-16T11:45:16","date_gmt":"2024-10-16T03:45:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/78338\/"},"modified":"2024-10-16T11:45:17","modified_gmt":"2024-10-16T03:45:17","slug":"mysql%e6%8c%87%e4%bb%a4-describe%ef%bc%88%e6%8f%8f%e8%bf%b0%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/78338\/","title":{"rendered":"MySQL\u6307\u4ee4: DESCRIBE\uff08\u63cf\u8ff0\uff09"},"content":{"rendered":"<h1 id=\"mysql%e6%8c%87%e4%bb%a4-describe%ef%bc%88%e6%8f%8f%e8%bf%b0%ef%bc%89-YthjSfhRWA\">MySQL\u6307\u4ee4: DESCRIBE\uff08\u63cf\u8ff0\uff09<\/h1>\n<p>\u5728\u4f7f\u7528MySQL\u9032\u884c\u8cc7\u6599\u5eab\u7ba1\u7406\u6642\uff0c\u4e86\u89e3\u8cc7\u6599\u8868\u7684\u7d50\u69cb\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002MySQL\u63d0\u4f9b\u4e86\u4e00\u500b\u7c21\u55ae\u800c\u6709\u6548\u7684\u6307\u4ee4\u2014\u2014DESCRIBE\uff08\u63cf\u8ff0\uff09\uff0c\u7528\u65bc\u986f\u793a\u8cc7\u6599\u8868\u7684\u7d50\u69cb\u8cc7\u8a0a\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eDESCRIBE\u6307\u4ee4\u7684\u7528\u6cd5\u53ca\u5176\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u4e2d\u7684\u91cd\u8981\u6027\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%afdescribe%e6%8c%87%e4%bb%a4%ef%bc%9f-YthjSfhRWA\">\u4ec0\u9ebc\u662fDESCRIBE\u6307\u4ee4\uff1f<\/h2>\n<p>DESCRIBE\u6307\u4ee4\u662f\u4e00\u500b\u7528\u65bc\u986f\u793a\u8cc7\u6599\u8868\u7d50\u69cb\u7684SQL\u6307\u4ee4\u3002\u5b83\u53ef\u4ee5\u63d0\u4f9b\u6709\u95dc\u8cc7\u6599\u8868\u4e2d\u5404\u500b\u6b04\u4f4d\u7684\u8a73\u7d30\u8cc7\u8a0a\uff0c\u5305\u62ec\u6b04\u4f4d\u540d\u7a31\u3001\u8cc7\u6599\u985e\u578b\u3001\u662f\u5426\u53ef\u4ee5\u70baNULL\u3001\u9375\u7684\u985e\u578b\u3001\u9810\u8a2d\u503c\u7b49\u3002\u9019\u4e9b\u8cc7\u8a0a\u5c0d\u65bc\u8cc7\u6599\u5eab\u7ba1\u7406\u54e1\u548c\u958b\u767c\u8005\u4f86\u8aaa\u90fd\u662f\u975e\u5e38\u6709\u7528\u7684\uff0c\u56e0\u70ba\u5b83\u5011\u53ef\u4ee5\u5e6b\u52a9\u7406\u89e3\u8cc7\u6599\u8868\u7684\u8a2d\u8a08\u548c\u6578\u64da\u7684\u5b58\u5132\u65b9\u5f0f\u3002<\/p>\n<h2 id=\"describe%e6%8c%87%e4%bb%a4%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-YthjSfhRWA\">DESCRIBE\u6307\u4ee4\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<pre><code>DESCRIBE table_name;<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c<code>table_name<\/code>\u662f\u4f60\u60f3\u8981\u63cf\u8ff0\u7684\u8cc7\u6599\u8868\u7684\u540d\u7a31\u3002\u57f7\u884c\u9019\u500b\u6307\u4ee4\u5f8c\uff0cMySQL\u5c07\u8fd4\u56de\u8a72\u8cc7\u6599\u8868\u7684\u7d50\u69cb\u8cc7\u8a0a\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e7%af%84%e4%be%8b-YthjSfhRWA\">\u4f7f\u7528\u7bc4\u4f8b<\/h2>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba<code>employees<\/code>\u7684\u8cc7\u6599\u8868\uff0c\u7d50\u69cb\u5982\u4e0b\uff1a<\/p>\n<pre><code>CREATE TABLE employees (\n    id INT AUTO_INCREMENT PRIMARY KEY,\n    name VARCHAR(100) NOT NULL,\n    position VARCHAR(50),\n    salary DECIMAL(10, 2),\n    hire_date DATE\n);<\/code><\/pre>\n<p>\u8981\u67e5\u770b\u9019\u500b\u8cc7\u6599\u8868\u7684\u7d50\u69cb\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u6307\u4ee4\uff1a<\/p>\n<pre><code>DESCRIBE employees;<\/code><\/pre>\n<p>\u57f7\u884c\u5f8c\uff0cMySQL\u5c07\u8fd4\u56de\u985e\u4f3c\u4ee5\u4e0b\u7684\u7d50\u679c\uff1a<\/p>\n<pre><code>+-----------+--------------+------+-----+---------+----------------+\n| Field     | Type         | Null | Key | Default | Extra          |\n+-----------+--------------+------+-----+---------+----------------+\n| id        | int(11)     | NO   | PRI | NULL    | auto_increment |\n| name      | varchar(100) | NO   |     | NULL    |                |\n| position  | varchar(50)  | YES  |     | NULL    |                |\n| salary    | decimal(10,2)| YES  |     | NULL    |                |\n| hire_date | date         | YES  |     | NULL    |                |\n+-----------+--------------+------+-----+---------+----------------+<\/code><\/pre>\n<h2 id=\"describe%e6%8c%87%e4%bb%a4%e7%9a%84%e8%bc%b8%e5%87%ba%e8%a7%a3%e9%87%8b-YthjSfhRWA\">DESCRIBE\u6307\u4ee4\u7684\u8f38\u51fa\u89e3\u91cb<\/h2>\n<ul>\n<li><strong>Field:<\/strong> \u6b04\u4f4d\u540d\u7a31\u3002<\/li>\n<li><strong>Type:<\/strong> \u8cc7\u6599\u985e\u578b\u53ca\u5176\u5c6c\u6027\u3002<\/li>\n<li><strong>Null:<\/strong> \u662f\u5426\u5141\u8a31NULL\u503c\u3002<\/li>\n<li><strong>Key:<\/strong> \u9375\u7684\u985e\u578b\uff08\u5982\u4e3b\u9375\u3001\u5916\u9375\u7b49\uff09\u3002<\/li>\n<li><strong>Default:<\/strong> \u9810\u8a2d\u503c\u3002<\/li>\n<li><strong>Extra:<\/strong> \u5176\u4ed6\u984d\u5916\u8cc7\u8a0a\uff0c\u5982\u81ea\u52d5\u589e\u91cf\u7b49\u3002<\/li>\n<\/ul>\n<h2 id=\"describe%e6%8c%87%e4%bb%a4%e7%9a%84%e6%9b%bf%e4%bb%a3%e6%96%b9%e6%b3%95-YthjSfhRWA\">DESCRIBE\u6307\u4ee4\u7684\u66ff\u4ee3\u65b9\u6cd5<\/h2>\n<p>\u9664\u4e86\u4f7f\u7528DESCRIBE\u6307\u4ee4\u5916\uff0c\u9084\u53ef\u4ee5\u4f7f\u7528<code>SHOW COLUMNS<\/code>\u6307\u4ee4\u4f86\u7372\u53d6\u76f8\u540c\u7684\u8cc7\u8a0a\u3002\u5176\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>SHOW COLUMNS FROM table_name;<\/code><\/pre>\n<p>\u9019\u500b\u6307\u4ee4\u7684\u8f38\u51fa\u683c\u5f0f\u8207DESCRIBE\u76f8\u4f3c\uff0c\u63d0\u4f9b\u4e86\u76f8\u540c\u7684\u6b04\u4f4d\u8cc7\u8a0a\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-YthjSfhRWA\">\u7e3d\u7d50<\/h2>\n<p>MySQL\u7684DESCRIBE\u6307\u4ee4\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u4f7f\u7528\u8005\u5feb\u901f\u4e86\u89e3\u8cc7\u6599\u8868\u7684\u7d50\u69cb\u3002\u7121\u8ad6\u662f\u5728\u8cc7\u6599\u5eab\u8a2d\u8a08\u968e\u6bb5\u9084\u662f\u7dad\u8b77\u968e\u6bb5\uff0c\u638c\u63e1\u9019\u500b\u6307\u4ee4\u90fd\u80fd\u63d0\u9ad8\u5de5\u4f5c\u6548\u7387\u3002\u5c0d\u65bc\u9700\u8981\u7ba1\u7406\u5927\u91cf\u6578\u64da\u7684\u4f01\u696d\u4f86\u8aaa\uff0c\u9078\u64c7\u5408\u9069\u7684<code><a href=\"https:\/\/server.hk\">VPS<\/a><\/code>\u6216<code><a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a><\/code>\u4f86\u904b\u884cMySQL\u8cc7\u6599\u5eab\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u900f\u904e\u9019\u4e9b\u5de5\u5177\uff0c\u4f7f\u7528\u8005\u53ef\u4ee5\u66f4\u6709\u6548\u5730\u7ba1\u7406\u548c\u67e5\u8a62\u6578\u64da\uff0c\u5f9e\u800c\u63d0\u5347\u696d\u52d9\u904b\u71df\u7684\u6548\u7387\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u6307\u4ee4DESCRIBE\uff08\u63cf\u8ff0\uff09\uff0c\u5feb\u901f\u67e5\u770b\u8868\u7ed3\u6784\u3001\u5b57\u6bb5\u7c7b\u578b\u53ca\u7ea6\u675f\uff0c\u52a9\u529b\u6570\u636e\u5e93\u7ba1\u7406\u4e0e\u4f18\u5316\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-78338","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78338","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=78338"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78338\/revisions"}],"predecessor-version":[{"id":78339,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/78338\/revisions\/78339"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=78338"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=78338"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=78338"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}