{"id":152615,"date":"2024-11-02T00:35:19","date_gmt":"2024-11-01T16:35:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/152615\/"},"modified":"2024-11-02T00:35:20","modified_gmt":"2024-11-01T16:35:20","slug":"%e6%9f%a5%e7%9c%8b%e6%9f%90%e5%80%8b%e8%a1%a8%e7%9a%84%e5%ad%97%e6%ae%b5%e4%bf%a1%e6%81%af%e4%bd%bf%e7%94%a8%e7%9a%84-sql-%e6%9f%a5%e8%a9%a2%e8%aa%9e%e5%8f%a5","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/152615\/","title":{"rendered":"\u67e5\u770b\u67d0\u500b\u8868\u7684\u5b57\u6bb5\u4fe1\u606f\u4f7f\u7528\u7684 SQL \u67e5\u8a62\u8a9e\u53e5"},"content":{"rendered":"

\u67e5\u770b\u67d0\u500b\u8868\u7684\u5b57\u6bb5\u4fe1\u606f\u4f7f\u7528\u7684 SQL \u67e5\u8a62\u8a9e\u53e5<\/h1>\n

\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u4e86\u89e3\u8868\u7684\u7d50\u69cb\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u7121\u8ad6\u662f\u9032\u884c\u6578\u64da\u5206\u6790\u3001\u958b\u767c\u61c9\u7528\u7a0b\u5e8f\uff0c\u9084\u662f\u9032\u884c\u6578\u64da\u9077\u79fb\uff0c\u638c\u63e1\u5982\u4f55\u67e5\u770b\u8868\u7684\u5b57\u6bb5\u4fe1\u606f\u90fd\u80fd\u5e6b\u52a9\u6211\u5011\u66f4\u6709\u6548\u5730\u64cd\u4f5c\u6578\u64da\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5e7e\u7a2e\u5e38\u7528\u7684 SQL \u67e5\u8a62\u8a9e\u53e5\uff0c\u5e6b\u52a9\u60a8\u67e5\u770b\u67d0\u500b\u8868\u7684\u5b57\u6bb5\u4fe1\u606f\u3002<\/p>\n

\u4f7f\u7528 DESCRIBE \u8a9e\u53e5<\/h2>\n

\u5728 MySQL \u4e2d\uff0c\u6700\u5e38\u7528\u7684\u67e5\u770b\u8868\u7d50\u69cb\u7684\u65b9\u5f0f\u662f\u4f7f\u7528 DESCRIBE<\/code> \u8a9e\u53e5\u3002\u9019\u500b\u8a9e\u53e5\u53ef\u4ee5\u986f\u793a\u8868\u4e2d\u6240\u6709\u5b57\u6bb5\u7684\u540d\u7a31\u3001\u6578\u64da\u985e\u578b\u3001\u662f\u5426\u53ef\u4ee5\u70ba\u7a7a\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\u70ba users<\/code> \u7684\u8868\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\u4f86\u67e5\u770b\u5176\u5b57\u6bb5\u4fe1\u606f\uff1a<\/p>\n
DESCRIBE users;<\/code><\/pre>\n
\u4f7f\u7528 SHOW COLUMNS \u8a9e\u53e5<\/h3>\n
\u53e6\u4e00\u7a2e\u5728 MySQL \u4e2d\u67e5\u770b\u8868\u5b57\u6bb5\u4fe1\u606f\u7684\u65b9\u6cd5\u662f\u4f7f\u7528 SHOW COLUMNS<\/code> \u8a9e\u53e5\u3002\u9019\u500b\u8a9e\u53e5\u7684\u529f\u80fd\u8207 DESCRIBE<\/code> \u985e\u4f3c\uff0c\u4f46\u5b83\u7684\u8a9e\u6cd5\u7a0d\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
\u4f7f\u7528 INFORMATION_SCHEMA<\/h2>\n
\u5c0d\u65bc\u9700\u8981\u66f4\u8a73\u7d30\u4fe1\u606f\u7684\u60c5\u6cc1\uff0c\u53ef\u4ee5\u67e5\u8a62 INFORMATION_SCHEMA<\/code> \u6578\u64da\u5eab\u3002\u9019\u662f\u4e00\u500b\u865b\u64ec\u6578\u64da\u5eab\uff0c\u5305\u542b\u4e86\u6240\u6709\u6578\u64da\u5eab\u7684\u5143\u6578\u64da\u3002\u60a8\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\u4f86\u7372\u53d6\u7279\u5b9a\u8868\u7684\u5b57\u6bb5\u4fe1\u606f\uff1a<\/p>\n
SELECT COLUMN_NAME, DATA_TYPE, IS_NULLABLE, COLUMN_DEFAULT \nFROM INFORMATION_SCHEMA.COLUMNS \nWHERE TABLE_NAME = '\u8868\u540d' AND TABLE_SCHEMA = '\u6578\u64da\u5eab\u540d';<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u5982\u679c\u6211\u5011\u60f3\u67e5\u770b users<\/code> \u8868\u7684\u5b57\u6bb5\u4fe1\u606f\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n
SELECT COLUMN_NAME, DATA_TYPE, IS_NULLABLE, COLUMN_DEFAULT \nFROM INFORMATION_SCHEMA.COLUMNS \nWHERE TABLE_NAME = 'users' AND TABLE_SCHEMA = 'your_database_name';<\/code><\/pre>\n
\u4f7f\u7528 pg_catalog\uff08PostgreSQL\uff09<\/h2>\n
\u5982\u679c\u60a8\u4f7f\u7528\u7684\u662f PostgreSQL\uff0c\u5247\u53ef\u4ee5\u901a\u904e\u67e5\u8a62 pg_catalog<\/code> \u4f86\u7372\u53d6\u8868\u7684\u5b57\u6bb5\u4fe1\u606f\u3002\u4ee5\u4e0b\u662f\u67e5\u8a62\u8a9e\u53e5\u7684\u7bc4\u4f8b\uff1a<\/p>\n
SELECT column_name, data_type, is_nullable, column_default \nFROM pg_catalog.pg_columns \nWHERE table_name = '\u8868\u540d';<\/code><\/pre>\n
\u4f8b\u5982\uff1a<\/p>\n
SELECT column_name, data_type, is_nullable, column_default \nFROM pg_catalog.pg_columns \nWHERE table_name = 'users';<\/code><\/pre>\n
\u7d50\u8ad6<\/h2>\n
\u4e86\u89e3\u5982\u4f55\u67e5\u770b\u8868\u7684\u5b57\u6bb5\u4fe1\u606f\u662f\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\u7684\u57fa\u672c\u6280\u80fd\u3002\u7121\u8ad6\u60a8\u4f7f\u7528\u7684\u662f MySQL \u9084\u662f PostgreSQL\uff0c\u638c\u63e1\u9019\u4e9b\u67e5\u8a62\u8a9e\u53e5\u90fd\u80fd\u5e6b\u52a9\u60a8\u66f4\u597d\u5730\u7406\u89e3\u548c\u64cd\u4f5c\u6578\u64da\u3002\u900f\u904e DESCRIBE<\/code>\u3001SHOW COLUMNS<\/code>\u3001INFORMATION_SCHEMA<\/code> \u6216 pg_catalog<\/code>\uff0c\u60a8\u53ef\u4ee5\u8f15\u9b06\u7372\u53d6\u6240\u9700\u7684\u5b57\u6bb5\u4fe1\u606f\uff0c\u5f9e\u800c\u63d0\u9ad8\u5de5\u4f5c\u6548\u7387\u3002<\/p>\n
\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u7684\u7528\u6236\u3002\u7121\u8ad6\u662f \u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u670d\u52d9\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u53ef\u9760\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e86\u89e3\u5982\u4f55\u4f7f\u7528 SQL \u67e5\u8a62\u8a9e\u53e5\u67e5\u770b\u7279\u5b9a\u8868\u7684\u5b57\u6bb5\u4fe1\u606f\uff0c\u8f15\u9b06\u7372\u53d6\u6578\u64da\u5eab\u7d50\u69cb\u8a73\u60c5\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-152615","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/152615","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=152615"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/152615\/revisions"}],"predecessor-version":[{"id":152616,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/152615\/revisions\/152616"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=152615"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=152615"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=152615"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}