{"id":79706,"date":"2024-10-16T13:29:14","date_gmt":"2024-10-16T05:29:14","guid":{"rendered":"https:\/\/server.hk\/cnblog\/79706\/"},"modified":"2024-10-16T13:29:15","modified_gmt":"2024-10-16T05:29:15","slug":"mysql%e6%8c%87%e4%bb%a4-show-columns%ef%bc%88%e5%b1%95%e7%a4%ba%e5%88%97%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/79706\/","title":{"rendered":"MySQL\u6307\u4ee4: SHOW COLUMNS\uff08\u5c55\u793a\u5217\uff09"},"content":{"rendered":"<h1 id=\"mysql%e6%8c%87%e4%bb%a4-show-columns%ef%bc%88%e5%b1%95%e7%a4%ba%e5%88%97%ef%bc%89-sBzMfoSPhV\">MySQL\u6307\u4ee4: SHOW COLUMNS\uff08\u5c55\u793a\u5217\uff09<\/h1>\n<p>\u5728\u4f7f\u7528MySQL\u9032\u884c\u6578\u64da\u5eab\u7ba1\u7406\u6642\uff0c\u4e86\u89e3\u8868\u7684\u7d50\u69cb\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002MySQL\u63d0\u4f9b\u4e86\u591a\u7a2e\u6307\u4ee4\u4f86\u5e6b\u52a9\u7528\u6236\u7372\u53d6\u8868\u7684\u8a73\u7d30\u4fe1\u606f\uff0c\u5176\u4e2d\u4e4b\u4e00\u5c31\u662f<strong>SHOW COLUMNS<\/strong>\u6307\u4ee4\u3002\u9019\u500b\u6307\u4ee4\u53ef\u4ee5\u8b93\u7528\u6236\u67e5\u770b\u7279\u5b9a\u8868\u4e2d\u6240\u6709\u5217\u7684\u8a73\u7d30\u4fe1\u606f\uff0c\u5305\u62ec\u5217\u540d\u3001\u6578\u64da\u985e\u578b\u3001\u662f\u5426\u53ef\u4ee5\u70baNULL\u3001\u9375\u7684\u985e\u578b\u3001\u9ed8\u8a8d\u503c\u7b49\u3002<\/p>\n<h2 id=\"show-columns%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-sBzMfoSPhV\">SHOW COLUMNS\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>SHOW COLUMNS\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>SHOW COLUMNS FROM \u8868\u540d;<\/code><\/pre>\n<p>\u6216\u8005\uff0c\u4f60\u4e5f\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>SHOW COLUMNS IN \u8868\u540d;<\/code><\/pre>\n<p>\u9019\u5169\u7a2e\u8a9e\u6cd5\u7684\u6548\u679c\u662f\u76f8\u540c\u7684\uff0c\u90fd\u662f\u7528\u4f86\u5c55\u793a\u6307\u5b9a\u8868\u7684\u5217\u4fe1\u606f\u3002<\/p>\n<h2 id=\"show-columns%e7%9a%84%e8%bc%b8%e5%87%ba%e7%b5%90%e6%9e%9c-sBzMfoSPhV\">SHOW COLUMNS\u7684\u8f38\u51fa\u7d50\u679c<\/h2>\n<p>\u57f7\u884cSHOW COLUMNS\u6307\u4ee4\u5f8c\uff0cMySQL\u6703\u8fd4\u56de\u4e00\u500b\u7d50\u679c\u96c6\uff0c\u5305\u542b\u4ee5\u4e0b\u5e7e\u500b\u91cd\u8981\u7684\u6b04\u4f4d\uff1a<\/p>\n<ul>\n<li><strong>Field<\/strong>: \u5217\u7684\u540d\u7a31\u3002<\/li>\n<li><strong>Type<\/strong>: \u5217\u7684\u6578\u64da\u985e\u578b\uff0c\u4f8b\u5982INT\u3001VARCHAR\u7b49\u3002<\/li>\n<li><strong>Null<\/strong>: \u6307\u793a\u8a72\u5217\u662f\u5426\u53ef\u4ee5\u70baNULL\u3002<\/li>\n<li><strong>Key<\/strong>: \u6307\u793a\u8a72\u5217\u662f\u5426\u662f\u7d22\u5f15\u7684\u4e00\u90e8\u5206\u3002<\/li>\n<li><strong>Default<\/strong>: \u5217\u7684\u9ed8\u8a8d\u503c\u3002<\/li>\n<li><strong>Extra<\/strong>: \u5176\u4ed6\u4fe1\u606f\uff0c\u4f8b\u5982\u81ea\u589e\uff08AUTO_INCREMENT\uff09\u7b49\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%a4%ba%e4%be%8b-sBzMfoSPhV\">\u793a\u4f8b<\/h2>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba<strong>users<\/strong>\u7684\u8868\uff0c\u7d50\u69cb\u5982\u4e0b\uff1a<\/p>\n<pre><code>CREATE TABLE users (\n    id INT AUTO_INCREMENT PRIMARY KEY,\n    username VARCHAR(50) NOT NULL,\n    email VARCHAR(100) NOT NULL,\n    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP\n);<\/code><\/pre>\n<p>\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u6307\u4ee4\u4f86\u67e5\u770b\u8a72\u8868\u7684\u5217\u4fe1\u606f\uff1a<\/p>\n<pre><code>SHOW COLUMNS FROM users;<\/code><\/pre>\n<p>\u57f7\u884c\u5f8c\uff0c\u8fd4\u56de\u7684\u7d50\u679c\u53ef\u80fd\u5982\u4e0b\uff1a<\/p>\n<pre><code>+-----------+---------------------+------+-----+-------------------+-----------------------------+\n| Field     | Type                | Null | Key | Default           | Extra                       |\n+-----------+---------------------+------+-----+-------------------+-----------------------------+\n| id        | int(11)             | NO   | PRI | NULL              | auto_increment              |\n| username  | varchar(50)         | NO   |     | NULL              |                             |\n| email     | varchar(100)        | NO   |     | NULL              |                             |\n| created_at| timestamp           | YES  |     | CURRENT_TIMESTAMP |                             |\n+-----------+---------------------+------+-----+-------------------+-----------------------------+<\/code><\/pre>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e5%a0%b4%e6%99%af-sBzMfoSPhV\">\u4f7f\u7528\u5834\u666f<\/h2>\n<p>SHOW COLUMNS\u6307\u4ee4\u5728\u591a\u7a2e\u60c5\u6cc1\u4e0b\u90fd\u975e\u5e38\u6709\u7528\uff0c\u4f8b\u5982\uff1a<\/p>\n<ul>\n<li>\u7576\u4f60\u9700\u8981\u4e86\u89e3\u67d0\u500b\u8868\u7684\u7d50\u69cb\u6642\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u578b\u6578\u64da\u5eab\u6642\u3002<\/li>\n<li>\u5728\u9032\u884c\u6578\u64da\u9077\u79fb\u6216\u5099\u4efd\u6642\uff0c\u4e86\u89e3\u8868\u7684\u7d50\u69cb\u53ef\u4ee5\u5e6b\u52a9\u4f60\u66f4\u597d\u5730\u8a2d\u8a08\u6578\u64da\u9077\u79fb\u7b56\u7565\u3002<\/li>\n<li>\u5728\u8abf\u8a66SQL\u67e5\u8a62\u6642\uff0c\u78ba\u4fdd\u4f60\u4f7f\u7528\u7684\u5217\u540d\u548c\u6578\u64da\u985e\u578b\u6b63\u78ba\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-sBzMfoSPhV\">\u7e3d\u7d50<\/h2>\n<p>SHOW COLUMNS\u6307\u4ee4\u662fMySQL\u4e2d\u4e00\u500b\u975e\u5e38\u5be6\u7528\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u5feb\u901f\u7372\u53d6\u8868\u7684\u7d50\u69cb\u4fe1\u606f\u3002\u7121\u8ad6\u662f\u5728\u6578\u64da\u5eab\u8a2d\u8a08\u3001\u7dad\u8b77\u9084\u662f\u8abf\u8a66\u904e\u7a0b\u4e2d\uff0c\u9019\u500b\u6307\u4ee4\u90fd\u80fd\u63d0\u4f9b\u91cd\u8981\u7684\u652f\u6301\u3002\u5c0d\u65bc\u4f7f\u7528<strong><a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a><\/strong>\u9032\u884c\u6578\u64da\u5eab\u7ba1\u7406\u7684\u7528\u6236\u4f86\u8aaa\uff0c\u638c\u63e1\u9019\u4e9b\u57fa\u672c\u6307\u4ee4\u5c07\u6709\u52a9\u65bc\u63d0\u5347\u5de5\u4f5c\u6548\u7387\u548c\u6578\u64da\u7ba1\u7406\u80fd\u529b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u6307\u4ee4SHOW COLUMNS\uff0c\u5feb\u901f\u67e5\u770b\u8868\u7684\u5217\u4fe1\u606f\uff0c\u5305\u62ec\u5217\u540d\u3001\u6570\u636e\u7c7b\u578b\u53ca\u5176\u4ed6\u5c5e\u6027\uff0c\u52a9\u529b\u6570\u636e\u5e93\u7ba1\u7406\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-79706","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/79706","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=79706"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/79706\/revisions"}],"predecessor-version":[{"id":79707,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/79706\/revisions\/79707"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=79706"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=79706"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=79706"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}