{"id":75796,"date":"2024-10-16T01:18:16","date_gmt":"2024-10-15T17:18:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/75796\/"},"modified":"2024-10-16T01:18:16","modified_gmt":"2024-10-15T17:18:16","slug":"mysql-%e6%9f%a5%e8%a9%a2%e8%a1%a8%e5%ad%97%e6%ae%b5%e5%80%8b%e6%95%b8%e7%9a%84%e5%85%a9%e7%a8%ae%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/75796\/","title":{"rendered":"MySQL \u67e5\u8a62\u8868\u5b57\u6bb5\u500b\u6578\u7684\u5169\u7a2e\u65b9\u6cd5"},"content":{"rendered":"<h1 id=\"mysql-%e6%9f%a5%e8%a9%a2%e8%a1%a8%e5%ad%97%e6%ae%b5%e5%80%8b%e6%95%b8%e7%9a%84%e5%85%a9%e7%a8%ae%e6%96%b9%e6%b3%95-lqwccUqAQR\">MySQL \u67e5\u8a62\u8868\u5b57\u6bb5\u500b\u6578\u7684\u5169\u7a2e\u65b9\u6cd5<\/h1>\n<p>\u5728\u4f7f\u7528 MySQL \u6578\u64da\u5eab\u6642\uff0c\u4e86\u89e3\u5982\u4f55\u67e5\u8a62\u8868\u4e2d\u7684\u5b57\u6bb5\u500b\u6578\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u9019\u4e0d\u50c5\u6709\u52a9\u65bc\u6578\u64da\u5eab\u7ba1\u7406\uff0c\u9084\u80fd\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5169\u7a2e\u5e38\u7528\u7684\u65b9\u6cd5\u4f86\u67e5\u8a62 MySQL \u8868\u7684\u5b57\u6bb5\u500b\u6578\uff0c\u4e26\u63d0\u4f9b\u76f8\u61c9\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u3002<\/p>\n<h2 id=\"%e6%96%b9%e6%b3%95%e4%b8%80%ef%bc%9a%e4%bd%bf%e7%94%a8-information_schema-lqwccUqAQR\">\u65b9\u6cd5\u4e00\uff1a\u4f7f\u7528 INFORMATION_SCHEMA<\/h2>\n<p>MySQL \u63d0\u4f9b\u4e86\u4e00\u500b\u540d\u70ba <code>INFORMATION_SCHEMA<\/code> \u7684\u7cfb\u7d71\u6578\u64da\u5eab\uff0c\u8a72\u6578\u64da\u5eab\u5305\u542b\u4e86\u6709\u95dc\u6240\u6709\u5176\u4ed6\u6578\u64da\u5eab\u7684\u5143\u6578\u64da\u3002\u901a\u904e\u67e5\u8a62 <code>INFORMATION_SCHEMA.COLUMNS<\/code> \u8868\uff0c\u6211\u5011\u53ef\u4ee5\u8f15\u9b06\u7372\u53d6\u7279\u5b9a\u8868\u7684\u5b57\u6bb5\u500b\u6578\u3002<\/p>\n<h3 id=\"%e6%9f%a5%e8%a9%a2%e8%aa%9e%e5%8f%a5-lqwccUqAQR\">\u67e5\u8a62\u8a9e\u53e5<\/h3>\n<pre><code>\nSELECT COUNT(*) AS field_count \nFROM INFORMATION_SCHEMA.COLUMNS \nWHERE TABLE_NAME = 'your_table_name' \nAND TABLE_SCHEMA = 'your_database_name';\n<\/code><\/pre>\n<p>\u5728\u4e0a\u8ff0\u67e5\u8a62\u4e2d\uff0c\u8acb\u5c07 <code>your_table_name<\/code> \u66ff\u63db\u70ba\u4f60\u8981\u67e5\u8a62\u7684\u8868\u540d\uff0c<code>your_database_name<\/code> \u66ff\u63db\u70ba\u76f8\u61c9\u7684\u6578\u64da\u5eab\u540d\u3002\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de\u8a72\u8868\u7684\u5b57\u6bb5\u7e3d\u6578\u3002<\/p>\n<h3 id=\"%e7%a4%ba%e4%be%8b-lqwccUqAQR\">\u793a\u4f8b<\/h3>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba <code>employees<\/code> \u7684\u8868\uff0c\u4e26\u4e14\u5b83\u4f4d\u65bc\u540d\u70ba <code>company_db<\/code> \u7684\u6578\u64da\u5eab\u4e2d\u3002\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\u4f86\u7372\u53d6\u5b57\u6bb5\u500b\u6578\uff1a<\/p>\n<pre><code>\nSELECT COUNT(*) AS field_count \nFROM INFORMATION_SCHEMA.COLUMNS \nWHERE TABLE_NAME = 'employees' \nAND TABLE_SCHEMA = 'company_db';\n<\/code><\/pre>\n<p>\u57f7\u884c\u5f8c\uff0c\u5c07\u8fd4\u56de\u8a72\u8868\u7684\u5b57\u6bb5\u6578\u91cf\uff0c\u4f8b\u5982\uff1a5\u3002<\/p>\n<h2 id=\"%e6%96%b9%e6%b3%95%e4%ba%8c%ef%bc%9a%e4%bd%bf%e7%94%a8-show-columns-%e5%91%bd%e4%bb%a4-lqwccUqAQR\">\u65b9\u6cd5\u4e8c\uff1a\u4f7f\u7528 SHOW COLUMNS \u547d\u4ee4<\/h2>\n<p>\u53e6\u4e00\u7a2e\u67e5\u8a62\u8868\u5b57\u6bb5\u500b\u6578\u7684\u65b9\u6cd5\u662f\u4f7f\u7528 <code>SHOW COLUMNS<\/code> \u547d\u4ee4\u3002\u9019\u500b\u547d\u4ee4\u6703\u5217\u51fa\u8868\u4e2d\u7684\u6240\u6709\u5b57\u6bb5\u53ca\u5176\u5c6c\u6027\uff0c\u7136\u5f8c\u6211\u5011\u53ef\u4ee5\u901a\u904e\u8a08\u7b97\u8fd4\u56de\u7684\u884c\u6578\u4f86\u7372\u53d6\u5b57\u6bb5\u500b\u6578\u3002<\/p>\n<h3 id=\"%e6%9f%a5%e8%a9%a2%e8%aa%9e%e5%8f%a5-lqwccUqAQR\">\u67e5\u8a62\u8a9e\u53e5<\/h3>\n<pre><code>\nSHOW COLUMNS FROM your_table_name;\n<\/code><\/pre>\n<p>\u57f7\u884c\u9019\u689d\u547d\u4ee4\u5f8c\uff0cMySQL \u5c07\u8fd4\u56de\u8a72\u8868\u7684\u6240\u6709\u5b57\u6bb5\u4fe1\u606f\u3002\u63a5\u4e0b\u4f86\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528 <code>SELECT COUNT(*)<\/code> \u4f86\u8a08\u7b97\u884c\u6578\u3002<\/p>\n<h3 id=\"%e7%a4%ba%e4%be%8b-lqwccUqAQR\">\u793a\u4f8b<\/h3>\n<p>\u7e7c\u7e8c\u4ee5 <code>employees<\/code> \u8868\u70ba\u4f8b\uff0c\u6211\u5011\u53ef\u4ee5\u9019\u6a23\u67e5\u8a62\uff1a<\/p>\n<pre><code>\nSHOW COLUMNS FROM employees;\n<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u985e\u4f3c\u4ee5\u4e0b\u7684\u7d50\u679c\uff1a<\/p>\n<ul>\n<li>Field: id<\/li>\n<li>Field: name<\/li>\n<li>Field: position<\/li>\n<li>Field: salary<\/li>\n<li>Field: hire_date<\/li>\n<\/ul>\n<p>\u5f9e\u9019\u88e1\uff0c\u6211\u5011\u53ef\u4ee5\u770b\u5230\u8a72\u8868\u6709 5 \u500b\u5b57\u6bb5\u3002\u82e5\u8981\u81ea\u52d5\u8a08\u7b97\u5b57\u6bb5\u500b\u6578\uff0c\u53ef\u4ee5\u5c07\u7d50\u679c\u5c0e\u5165\u5230\u61c9\u7528\u7a0b\u5e8f\u4e2d\u9032\u884c\u8a08\u7b97\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-lqwccUqAQR\">\u7e3d\u7d50<\/h2>\n<p>\u5728 MySQL \u4e2d\u67e5\u8a62\u8868\u5b57\u6bb5\u500b\u6578\u7684\u5169\u7a2e\u65b9\u6cd5\u5206\u5225\u662f\u4f7f\u7528 <code>INFORMATION_SCHEMA<\/code> \u548c <code>SHOW COLUMNS<\/code> \u547d\u4ee4\u3002\u9019\u5169\u7a2e\u65b9\u6cd5\u5404\u6709\u512a\u7f3a\u9ede\uff0c\u6839\u64da\u5177\u9ad4\u9700\u6c42\u9078\u64c7\u5408\u9069\u7684\u65b9\u6cd5\u53ef\u4ee5\u63d0\u9ad8\u5de5\u4f5c\u6548\u7387\u3002\u7121\u8ad6\u662f\u9032\u884c\u6578\u64da\u5eab\u7ba1\u7406\u9084\u662f\u958b\u767c\uff0c\u638c\u63e1\u9019\u4e9b\u57fa\u672c\u67e5\u8a62\u6280\u5de7\u90fd\u662f\u975e\u5e38\u6709\u5e6b\u52a9\u7684\u3002<\/p>\n<p>\u5982\u679c\u4f60\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u7528\u6236\u7684\u9700\u6c42\u3002\u7121\u8ad6\u662f\u6578\u64da\u5eab\u7ba1\u7406\u9084\u662f\u7db2\u7ad9\u6258\u7ba1\uff0c\u6211\u5011\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u90fd\u80fd\u70ba\u4f60\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22 MySQL \u4e2d\u67e5\u8a62\u8868\u5b57\u6bb5\u500b\u6578\u7684\u5169\u7a2e\u65b9\u6cd5\uff0c\u7c21\u55ae\u6613\u61c2\uff0c\u5e6b\u52a9\u4f60\u5feb\u901f\u638c\u63e1\u6578\u64da\u5eab\u64cd\u4f5c\u6280\u5de7\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-75796","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/75796","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=75796"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/75796\/revisions"}],"predecessor-version":[{"id":75797,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/75796\/revisions\/75797"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=75796"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=75796"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=75796"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}