{"id":166001,"date":"2024-11-05T14:54:18","date_gmt":"2024-11-05T06:54:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/166001\/"},"modified":"2024-11-05T14:54:19","modified_gmt":"2024-11-05T06:54:19","slug":"%e5%bf%ab%e9%80%9f%e7%8d%b2%e5%8f%96%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%a8%e4%b8%ad%e7%9a%84%e6%9c%80%e6%96%b0%e6%95%b8%e6%93%9a%e6%96%b9%e6%b3%95-%e7%8d%b2%e5%8f%96%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%a8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/166001\/","title":{"rendered":"\u5feb\u901f\u7372\u53d6\u6578\u64da\u5eab\u8868\u4e2d\u7684\u6700\u65b0\u6578\u64da\u65b9\u6cd5 (\u7372\u53d6\u6578\u64da\u5eab\u8868\u4e2d\u6700\u5f8c\u4e00\u884c\u6578\u64da)"},"content":{"rendered":"

\u5feb\u901f\u7372\u53d6\u6578\u64da\u5eab\u8868\u4e2d\u7684\u6700\u65b0\u6578\u64da\u65b9\u6cd5 (\u7372\u53d6\u6578\u64da\u5eab\u8868\u4e2d\u6700\u5f8c\u4e00\u884c\u6578\u64da)<\/h1>\n

\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u7d93\u5e38\u9700\u8981\u7372\u53d6\u8868\u4e2d\u7684\u6700\u65b0\u6578\u64da\uff0c\u7279\u5225\u662f\u7576\u6578\u64da\u4e0d\u65b7\u66f4\u65b0\u6642\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5e7e\u7a2e\u6709\u6548\u7684\u65b9\u6cd5\u4f86\u5feb\u901f\u7372\u53d6\u6578\u64da\u5eab\u8868\u4e2d\u7684\u6700\u65b0\u6578\u64da\uff0c\u7279\u5225\u662f\u5982\u4f55\u7372\u53d6\u6578\u64da\u5eab\u8868\u4e2d\u7684\u6700\u5f8c\u4e00\u884c\u6578\u64da\u3002<\/p>\n

\u7406\u89e3\u6578\u64da\u5eab\u8868\u7684\u7d50\u69cb<\/h2>\n

\u5728\u6df1\u5165\u63a2\u8a0e\u5982\u4f55\u7372\u53d6\u6700\u65b0\u6578\u64da\u4e4b\u524d\uff0c\u9996\u5148\u9700\u8981\u4e86\u89e3\u6578\u64da\u5eab\u8868\u7684\u57fa\u672c\u7d50\u69cb\u3002\u6578\u64da\u5eab\u8868\u7531\u884c\u548c\u5217\u7d44\u6210\uff0c\u6bcf\u4e00\u884c\u4ee3\u8868\u4e00\u689d\u8a18\u9304\uff0c\u800c\u6bcf\u4e00\u5217\u5247\u4ee3\u8868\u8a72\u8a18\u9304\u7684\u5c6c\u6027\u3002\u901a\u5e38\uff0c\u6578\u64da\u5eab\u8868\u6703\u6709\u4e00\u500b\u4e3b\u9375\uff08Primary Key\uff09\uff0c\u7528\u65bc\u552f\u4e00\u6a19\u8b58\u6bcf\u4e00\u884c\u6578\u64da\u3002<\/p>\n

\u4f7f\u7528 SQL \u67e5\u8a62\u7372\u53d6\u6700\u65b0\u6578\u64da<\/h2>\n

\u6700\u5e38\u898b\u7684\u65b9\u6cd5\u662f\u4f7f\u7528 SQL \u67e5\u8a62\u4f86\u7372\u53d6\u8868\u4e2d\u7684\u6700\u65b0\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u5e7e\u7a2e\u5e38\u7528\u7684 SQL \u67e5\u8a62\u65b9\u6cd5\uff1a<\/p>\n

1. \u4f7f\u7528 ORDER BY \u548c LIMIT<\/h3>\n

\u5982\u679c\u6578\u64da\u8868\u4e2d\u6709\u4e00\u500b\u6642\u9593\u6233\u5b57\u6bb5\uff08\u4f8b\u5982 created_at \u6216 updated_at\uff09\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b SQL \u67e5\u8a62\u4f86\u7372\u53d6\u6700\u65b0\u7684\u4e00\u884c\u6578\u64da\uff1a<\/p>\n

SELECT * FROM your_table_name\nORDER BY created_at DESC\nLIMIT 1;<\/code><\/pre>\n
\u9019\u689d\u67e5\u8a62\u6703\u6839\u64da\u6642\u9593\u6233\u5b57\u6bb5\u964d\u5e8f\u6392\u5217\u6578\u64da\uff0c\u4e26\u53ea\u8fd4\u56de\u6700\u65b0\u7684\u4e00\u884c\u3002<\/p>\n
2. \u4f7f\u7528\u5b50\u67e5\u8a62<\/h3>\n
\u53e6\u4e00\u7a2e\u65b9\u6cd5\u662f\u4f7f\u7528\u5b50\u67e5\u8a62\u4f86\u7372\u53d6\u6700\u65b0\u6578\u64da\u3002\u4f8b\u5982\uff1a<\/p>\n
SELECT * FROM your_table_name\nWHERE id = (SELECT MAX(id) FROM your_table_name);<\/code><\/pre>\n
\u9019\u689d\u67e5\u8a62\u6703\u8fd4\u56de id \u6700\u5927\u7684\u90a3\u4e00\u884c\u6578\u64da\uff0c\u5047\u8a2d id \u662f\u81ea\u589e\u7684\u4e3b\u9375\u3002<\/p>\n
3. \u4f7f\u7528\u7a97\u53e3\u51fd\u6578<\/h3>\n
\u5728\u67d0\u4e9b\u6578\u64da\u5eab\u7cfb\u7d71\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u7a97\u53e3\u51fd\u6578\u4f86\u7372\u53d6\u6700\u65b0\u6578\u64da\u3002\u4f8b\u5982\uff0c\u4f7f\u7528 PostgreSQL \u7684 ROW_NUMBER() \u51fd\u6578\uff1a<\/p>\n
SELECT * FROM (\n    SELECT *, ROW_NUMBER() OVER (ORDER BY created_at DESC) as rn\n    FROM your_table_name\n) as subquery\nWHERE rn = 1;<\/code><\/pre>\n
\u9019\u6a23\u53ef\u4ee5\u9748\u6d3b\u5730\u7372\u53d6\u6700\u65b0\u6578\u64da\uff0c\u4e26\u4e14\u53ef\u4ee5\u6839\u64da\u9700\u8981\u9032\u884c\u64f4\u5c55\u3002<\/p>\n
\u8003\u616e\u6027\u80fd\u554f\u984c<\/h2>\n
\u5728\u7372\u53d6\u6700\u65b0\u6578\u64da\u6642\uff0c\u6027\u80fd\u662f\u4e00\u500b\u91cd\u8981\u7684\u8003\u91cf\u56e0\u7d20\u3002\u5c0d\u65bc\u5927\u578b\u6578\u64da\u8868\uff0c\u4f7f\u7528\u7d22\u5f15\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u78ba\u4fdd\u5728\u6642\u9593\u6233\u5b57\u6bb5\u6216\u4e3b\u9375\u4e0a\u5efa\u7acb\u7d22\u5f15\uff0c\u4ee5\u52a0\u5feb\u67e5\u8a62\u901f\u5ea6\u3002<\/p>\n
\u7d50\u8ad6<\/h2>\n
\u7372\u53d6\u6578\u64da\u5eab\u8868\u4e2d\u7684\u6700\u65b0\u6578\u64da\u662f\u6578\u64da\u7ba1\u7406\u4e2d\u7684\u4e00\u500b\u5e38\u898b\u9700\u6c42\u3002\u901a\u904e\u4f7f\u7528 SQL \u67e5\u8a62\u3001\u5b50\u67e5\u8a62\u548c\u7a97\u53e3\u51fd\u6578\u7b49\u65b9\u6cd5\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u7372\u53d6\u6240\u9700\u7684\u6578\u64da\u3002\u5728\u5be6\u969b\u61c9\u7528\u4e2d\uff0c\u6839\u64da\u6578\u64da\u8868\u7684\u7d50\u69cb\u548c\u5927\u5c0f\u9078\u64c7\u5408\u9069\u7684\u65b9\u6cd5\uff0c\u4e26\u8003\u616e\u6027\u80fd\u512a\u5316\uff0c\u5c07\u6709\u52a9\u65bc\u63d0\u9ad8\u6578\u64da\u6aa2\u7d22\u7684\u6548\u7387\u3002<\/p>\n
\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u6301\u60a8\u7684\u6578\u64da\u5eab\u7ba1\u7406\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u7684\u5ba2\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":"
\u5feb\u901f\u7372\u53d6\u6578\u64da\u5eab\u8868\u4e2d\u6700\u65b0\u6578\u64da\u7684\u65b9\u6cd5\uff0c\u8f15\u9b06\u67e5\u8a62\u6700\u5f8c\u4e00\u884c\u6578\u64da\uff0c\u63d0\u5347\u6578\u64da\u8655\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-166001","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/166001","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=166001"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/166001\/revisions"}],"predecessor-version":[{"id":166002,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/166001\/revisions\/166002"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=166001"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=166001"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=166001"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}