{"id":172089,"date":"2024-11-07T10:13:49","date_gmt":"2024-11-07T02:13:49","guid":{"rendered":"https:\/\/server.hk\/cnblog\/172089\/"},"modified":"2024-11-07T10:13:49","modified_gmt":"2024-11-07T02:13:49","slug":"%e5%8f%96%e5%be%97mysql%e8%a1%a8%e4%bf%a1%e6%81%af%e7%9a%84%e8%aa%9e%e5%8f%a5","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/172089\/","title":{"rendered":"\u53d6\u5f97MySQL\u8868\u4fe1\u606f\u7684\u8a9e\u53e5"},"content":{"rendered":"

\u53d6\u5f97MySQL\u8868\u4fe1\u606f\u7684\u8a9e\u53e5<\/h1>\n

\u5728\u4f7f\u7528MySQL\u6578\u64da\u5eab\u6642\uff0c\u4e86\u89e3\u5982\u4f55\u53d6\u5f97\u8868\u7684\u7d50\u69cb\u548c\u4fe1\u606f\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u9019\u4e0d\u50c5\u6709\u52a9\u65bc\u6578\u64da\u5eab\u7684\u7ba1\u7406\uff0c\u9084\u80fd\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u597d\u5730\u7406\u89e3\u6578\u64da\u7684\u7d44\u7e54\u65b9\u5f0f\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5e7e\u7a2e\u5e38\u7528\u7684MySQL\u8a9e\u53e5\uff0c\u5e6b\u52a9\u7528\u6236\u7372\u53d6\u8868\u7684\u8a73\u7d30\u4fe1\u606f\u3002<\/p>\n

1. \u4f7f\u7528DESCRIBE\u8a9e\u53e5<\/h2>\n

\u6700\u5e38\u7528\u7684\u65b9\u5f0f\u4e4b\u4e00\u662f\u4f7f\u7528DESCRIBE<\/code>\u8a9e\u53e5\u3002\u9019\u500b\u8a9e\u53e5\u53ef\u4ee5\u5feb\u901f\u986f\u793a\u8868\u7684\u7d50\u69cb\uff0c\u5305\u62ec\u5b57\u6bb5\u540d\u7a31\u3001\u6578\u64da\u985e\u578b\u3001\u662f\u5426\u53ef\u4ee5\u70baNULL\u3001\u9375\u985e\u578b\u3001\u9ed8\u8a8d\u503c\u7b49\u4fe1\u606f\u3002<\/p>\n

DESCRIBE \u8868\u540d;<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u5982\u679c\u6211\u5011\u6709\u4e00\u500b\u540d\u70bausers<\/code>\u7684\u8868\uff0c\u53ef\u4ee5\u9019\u6a23\u67e5\u8a62\uff1a<\/p>\n
DESCRIBE users;<\/code><\/pre>\n
2. \u4f7f\u7528SHOW COLUMNS\u8a9e\u53e5<\/h3>\n
\u53e6\u4e00\u500b\u7372\u53d6\u8868\u4fe1\u606f\u7684\u65b9\u5f0f\u662f\u4f7f\u7528SHOW COLUMNS<\/code>\u8a9e\u53e5\u3002\u9019\u500b\u8a9e\u53e5\u7684\u529f\u80fd\u8207DESCRIBE<\/code>\u985e\u4f3c\uff0c\u4f46\u5b83\u63d0\u4f9b\u7684\u8f38\u51fa\u683c\u5f0f\u7565\u6709\u4e0d\u540c\u3002<\/p>\n
SHOW COLUMNS FROM \u8868\u540d;<\/code><\/pre>\n
\u4f8b\u5982\uff1a<\/p>\n
SHOW COLUMNS FROM users;<\/code><\/pre>\n
3. \u4f7f\u7528INFORMATION_SCHEMA<\/h3>\n
MySQL\u9084\u63d0\u4f9b\u4e86\u4e00\u500b\u540d\u70baINFORMATION_SCHEMA<\/code>\u7684\u6578\u64da\u5eab\uff0c\u9019\u662f\u4e00\u500b\u865b\u64ec\u6578\u64da\u5eab\uff0c\u5305\u542b\u4e86\u6240\u6709\u5176\u4ed6\u6578\u64da\u5eab\u7684\u5143\u6578\u64da\u3002\u901a\u904e\u67e5\u8a62\u9019\u500b\u6578\u64da\u5eab\uff0c\u6211\u5011\u53ef\u4ee5\u7372\u53d6\u66f4\u8a73\u7d30\u7684\u8868\u4fe1\u606f\u3002<\/p>\n
SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = '\u8868\u540d';<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u67e5\u8a62users<\/code>\u8868\u7684\u6240\u6709\u5217\u4fe1\u606f\uff1a<\/p>\n
SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = 'users';<\/code><\/pre>\n
4. \u4f7f\u7528SHOW TABLE STATUS<\/h3>\n
\u5982\u679c\u9700\u8981\u7372\u53d6\u6574\u500b\u8868\u7684\u72c0\u614b\u4fe1\u606f\uff0c\u53ef\u4ee5\u4f7f\u7528SHOW TABLE STATUS<\/code>\u8a9e\u53e5\u3002\u9019\u500b\u8a9e\u53e5\u63d0\u4f9b\u4e86\u8868\u7684\u5404\u7a2e\u7d71\u8a08\u4fe1\u606f\uff0c\u5305\u62ec\u884c\u6578\u3001\u6578\u64da\u5927\u5c0f\u3001\u7d22\u5f15\u5927\u5c0f\u7b49\u3002<\/p>\n
SHOW TABLE STATUS LIKE '\u8868\u540d';<\/code><\/pre>\n
\u4f8b\u5982\uff1a<\/p>\n
SHOW TABLE STATUS LIKE 'users';<\/code><\/pre>\n
5. \u7e3d\u7d50<\/h2>\n
\u4ee5\u4e0a\u4ecb\u7d39\u4e86\u5e7e\u7a2e\u5728MySQL\u4e2d\u53d6\u5f97\u8868\u4fe1\u606f\u7684\u5e38\u7528\u8a9e\u53e5\uff0c\u5305\u62ecDESCRIBE<\/code>\u3001SHOW COLUMNS<\/code>\u3001INFORMATION_SCHEMA<\/code>\u548cSHOW TABLE STATUS<\/code>\u3002\u9019\u4e9b\u8a9e\u53e5\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u548c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u5feb\u901f\u7372\u53d6\u6240\u9700\u7684\u8868\u7d50\u69cb\u548c\u72c0\u614b\u4fe1\u606f\uff0c\u5f9e\u800c\u66f4\u6709\u6548\u5730\u9032\u884c\u6578\u64da\u5eab\u7ba1\u7406\u548c\u958b\u767c\u3002<\/p>\n
\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528\u6211\u5011\u7684\u9999\u6e2fVPS<\/a>\u670d\u52d9\uff0c\u63d0\u4f9b\u7a69\u5b9a\u7684\u6027\u80fd\u548c\u9748\u6d3b\u7684\u914d\u7f6e\u9078\u64c7\uff0c\u6eff\u8db3\u60a8\u7684\u5404\u7a2e\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e86\u89e3\u5982\u4f55\u4f7f\u7528SQL\u8a9e\u53e5\u7372\u53d6MySQL\u8868\u7684\u7d50\u69cb\u548c\u6578\u64da\u4fe1\u606f\uff0c\u63d0\u5347\u6578\u64da\u5eab\u7ba1\u7406\u6548\u7387\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-172089","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/172089","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=172089"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/172089\/revisions"}],"predecessor-version":[{"id":172090,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/172089\/revisions\/172090"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=172089"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=172089"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=172089"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}