{"id":186018,"date":"2024-11-11T02:25:18","date_gmt":"2024-11-10T18:25:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/186018\/"},"modified":"2024-11-11T02:25:19","modified_gmt":"2024-11-10T18:25:19","slug":"%e6%95%b8%e6%93%9a%e5%ba%abupdate%e6%93%8d%e4%bd%9c%e7%9a%84%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85%ef%bc%88%e6%95%b8%e6%93%9a%e5%ba%ab%e7%9a%84update%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/186018\/","title":{"rendered":"\u6578\u64da\u5eabupdate\u64cd\u4f5c\u7684\u6ce8\u610f\u4e8b\u9805\uff08\u6578\u64da\u5eab\u7684update\uff09"},"content":{"rendered":"

\u6578\u64da\u5eabupdate\u64cd\u4f5c\u7684\u6ce8\u610f\u4e8b\u9805\uff08\u6578\u64da\u5eab\u7684update\uff09<\/h1>\n

\u5728\u73fe\u4ee3\u61c9\u7528\u7a0b\u5f0f\u4e2d\uff0c\u6578\u64da\u5eab\u626e\u6f14\u8457\u81f3\u95dc\u91cd\u8981\u7684\u89d2\u8272\u3002\u7121\u8ad6\u662f\u7528\u65bc\u5b58\u5132\u7528\u6236\u8cc7\u6599\u3001\u4ea4\u6613\u8a18\u9304\u9084\u662f\u5176\u4ed6\u95dc\u9375\u6578\u64da\uff0c\u6578\u64da\u5eab\u7684\u7a69\u5b9a\u6027\u548c\u53ef\u9760\u6027\u90fd\u76f4\u63a5\u5f71\u97ff\u5230\u61c9\u7528\u7a0b\u5f0f\u7684\u6027\u80fd\u548c\u7528\u6236\u9ad4\u9a57\u3002\u5728\u9032\u884c\u6578\u64da\u5eab\u7684\u66f4\u65b0\u64cd\u4f5c\u6642\uff0c\u958b\u767c\u8005\u9700\u8981\u7279\u5225\u6ce8\u610f\u4e00\u4e9b\u95dc\u9375\u4e8b\u9805\uff0c\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u7cfb\u7d71\u7684\u7a69\u5b9a\u6027\u3002<\/p>\n

1. \u78ba\u4fdd\u6578\u64da\u7684\u5b8c\u6574\u6027<\/h2>\n

\u5728\u57f7\u884c UPDATE<\/code> \u64cd\u4f5c\u4e4b\u524d\uff0c\u9996\u5148\u8981\u78ba\u4fdd\u6578\u64da\u7684\u5b8c\u6574\u6027\u3002\u9019\u610f\u5473\u8457\u5728\u66f4\u65b0\u6578\u64da\u4e4b\u524d\uff0c\u61c9\u8a72\u6aa2\u67e5\u6578\u64da\u7684\u7576\u524d\u72c0\u614b\uff0c\u78ba\u4fdd\u4e0d\u6703\u56e0\u70ba\u66f4\u65b0\u800c\u5c0e\u81f4\u6578\u64da\u4e0d\u4e00\u81f4\u3002\u4f8b\u5982\uff0c\u5982\u679c\u4e00\u500b\u7528\u6236\u7684\u5e33\u6236\u9918\u984d\u9700\u8981\u66f4\u65b0\uff0c\u61c9\u8a72\u5148\u78ba\u8a8d\u8a72\u7528\u6236\u7684\u5e33\u6236\u72c0\u614b\u662f\u6709\u6548\u7684\u3002<\/p>\n

SELECT * FROM users WHERE user_id = 1 AND account_status = 'active';\n<\/code><\/pre>\n
2. \u4f7f\u7528\u4e8b\u52d9\u7ba1\u7406<\/h2>\n
\u5728\u9032\u884c\u591a\u500b UPDATE<\/code> \u64cd\u4f5c\u6642\uff0c\u5efa\u8b70\u4f7f\u7528\u4e8b\u52d9\uff08Transaction\uff09\u4f86\u7ba1\u7406\u9019\u4e9b\u64cd\u4f5c\u3002\u4e8b\u52d9\u53ef\u4ee5\u78ba\u4fdd\u4e00\u7d44\u64cd\u4f5c\u8981\u9ebc\u5168\u90e8\u6210\u529f\uff0c\u8981\u9ebc\u5168\u90e8\u5931\u6557\uff0c\u5f9e\u800c\u907f\u514d\u6578\u64da\u4e0d\u4e00\u81f4\u7684\u60c5\u6cc1\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528\u4e8b\u52d9\u7684\u7bc4\u4f8b\uff1a<\/p>\n
BEGIN;\n\nUPDATE accounts SET balance = balance - 100 WHERE user_id = 1;\nUPDATE accounts SET balance = balance + 100 WHERE user_id = 2;\n\nCOMMIT;\n<\/code><\/pre>\n
\u5982\u679c\u5728\u57f7\u884c\u904e\u7a0b\u4e2d\u51fa\u73fe\u932f\u8aa4\uff0c\u53ef\u4ee5\u4f7f\u7528 ROLLBACK<\/code> \u4f86\u64a4\u92b7\u6240\u6709\u64cd\u4f5c\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u5b89\u5168\u6027\u3002<\/p>\n
3. \u4f7f\u7528\u689d\u4ef6\u66f4\u65b0<\/h2>\n
\u5728\u57f7\u884c UPDATE<\/code> \u64cd\u4f5c\u6642\uff0c\u52d9\u5fc5\u4f7f\u7528\u9069\u7576\u7684\u689d\u4ef6\u4f86\u9650\u5236\u66f4\u65b0\u7684\u7bc4\u570d\u3002\u9019\u6a23\u53ef\u4ee5\u907f\u514d\u610f\u5916\u66f4\u65b0\u5230\u4e0d\u61c9\u8a72\u66f4\u6539\u7684\u6578\u64da\u3002\u4f8b\u5982\uff1a<\/p>\n
UPDATE products SET price = price * 0.9 WHERE category = 'electronics';\n<\/code><\/pre>\n
\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u53ea\u6709\u985e\u5225\u70ba ‘electronics’ \u7684\u7522\u54c1\u50f9\u683c\u6703\u88ab\u66f4\u65b0\uff0c\u9019\u6a23\u53ef\u4ee5\u907f\u514d\u5f71\u97ff\u5230\u5176\u4ed6\u985e\u5225\u7684\u7522\u54c1\u3002<\/p>\n
4. \u5b9a\u671f\u5099\u4efd\u6578\u64da<\/h2>\n
\u5728\u9032\u884c\u4efb\u4f55\u6578\u64da\u5eab\u66f4\u65b0\u64cd\u4f5c\u4e4b\u524d\uff0c\u5b9a\u671f\u5099\u4efd\u6578\u64da\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u9019\u6a23\u53ef\u4ee5\u5728\u51fa\u73fe\u554f\u984c\u6642\u8fc5\u901f\u6062\u5fa9\u6578\u64da\uff0c\u6e1b\u5c11\u640d\u5931\u3002\u5099\u4efd\u53ef\u4ee5\u662f\u5168\u91cf\u5099\u4efd\u6216\u589e\u91cf\u5099\u4efd\uff0c\u5177\u9ad4\u53d6\u6c7a\u65bc\u696d\u52d9\u9700\u6c42\u3002<\/p>\n
5. \u6e2c\u8a66\u66f4\u65b0\u64cd\u4f5c<\/h2>\n
\u5728\u751f\u7522\u74b0\u5883\u4e2d\u57f7\u884c UPDATE<\/code> \u64cd\u4f5c\u4e4b\u524d\uff0c\u61c9\u8a72\u5728\u6e2c\u8a66\u74b0\u5883\u4e2d\u9032\u884c\u5145\u5206\u7684\u6e2c\u8a66\u3002\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u66f4\u65b0\u64cd\u4f5c\u4e0d\u6703\u5f15\u767c\u610f\u5916\u7684\u932f\u8aa4\u6216\u6027\u80fd\u554f\u984c\u3002\u6e2c\u8a66\u61c9\u5305\u62ec\u908a\u754c\u689d\u4ef6\u548c\u7570\u5e38\u60c5\u6cc1\uff0c\u4ee5\u78ba\u4fdd\u7cfb\u7d71\u7684\u7a69\u5b9a\u6027\u3002<\/p>\n
6. \u76e3\u63a7\u548c\u65e5\u8a8c\u8a18\u9304<\/h2>\n
\u5728\u57f7\u884c\u66f4\u65b0\u64cd\u4f5c\u5f8c\uff0c\u61c9\u8a72\u5c0d\u6578\u64da\u5eab\u9032\u884c\u76e3\u63a7\uff0c\u4e26\u8a18\u9304\u6240\u6709\u7684\u66f4\u65b0\u64cd\u4f5c\u3002\u9019\u6a23\u53ef\u4ee5\u5728\u51fa\u73fe\u554f\u984c\u6642\u5feb\u901f\u5b9a\u4f4d\u554f\u984c\u6240\u5728\uff0c\u4e26\u9032\u884c\u76f8\u61c9\u7684\u8655\u7406\u3002\u65e5\u8a8c\u8a18\u9304\u9084\u53ef\u4ee5\u5e6b\u52a9\u5206\u6790\u6578\u64da\u5eab\u7684\u6027\u80fd\uff0c\u70ba\u672a\u4f86\u7684\u512a\u5316\u63d0\u4f9b\u4f9d\u64da\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
\u6578\u64da\u5eab\u7684 UPDATE<\/code> \u64cd\u4f5c\u662f\u7ba1\u7406\u6578\u64da\u7684\u91cd\u8981\u90e8\u5206\uff0c\u4f46\u540c\u6642\u4e5f\u9700\u8981\u8b39\u614e\u5c0d\u5f85\u3002\u78ba\u4fdd\u6578\u64da\u5b8c\u6574\u6027\u3001\u4f7f\u7528\u4e8b\u52d9\u7ba1\u7406\u3001\u689d\u4ef6\u66f4\u65b0\u3001\u5b9a\u671f\u5099\u4efd\u3001\u6e2c\u8a66\u66f4\u65b0\u64cd\u4f5c\u4ee5\u53ca\u76e3\u63a7\u548c\u65e5\u8a8c\u8a18\u9304\u90fd\u662f\u6210\u529f\u57f7\u884c\u66f4\u65b0\u64cd\u4f5c\u7684\u95dc\u9375\u3002\u901a\u904e\u9075\u5faa\u9019\u4e9b\u6ce8\u610f\u4e8b\u9805\uff0c\u53ef\u4ee5\u6709\u6548\u964d\u4f4e\u6578\u64da\u5eab\u64cd\u4f5c\u4e2d\u7684\u98a8\u96aa\uff0c\u63d0\u5347\u7cfb\u7d71\u7684\u7a69\u5b9a\u6027\u548c\u53ef\u9760\u6027\u3002<\/p>\n
\u5982\u679c\u60a8\u9700\u8981\u9ad8\u6548\u7a69\u5b9a\u7684 \u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u4fe1\u606f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e86\u89e3\u6578\u64da\u5eabupdate\u64cd\u4f5c\u7684\u6ce8\u610f\u4e8b\u9805\uff0c\u5305\u62ec\u6578\u64da\u4e00\u81f4\u6027\u3001\u4e8b\u52d9\u7ba1\u7406\u548c\u6027\u80fd\u512a\u5316\uff0c\u78ba\u4fdd\u6578\u64da\u5b89\u5168\u8207\u5b8c\u6574\u6027\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-186018","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/186018","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=186018"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/186018\/revisions"}],"predecessor-version":[{"id":186019,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/186018\/revisions\/186019"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=186018"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=186018"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=186018"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}