{"id":160857,"date":"2024-11-04T01:35:22","date_gmt":"2024-11-03T17:35:22","guid":{"rendered":"https:\/\/server.hk\/cnblog\/160857\/"},"modified":"2024-11-04T01:35:23","modified_gmt":"2024-11-03T17:35:23","slug":"%e4%ba%92%e8%81%af%e7%b6%b2%e6%a5%ad%e5%8b%99%e5%86%aa%e7%ad%89%e6%80%a7%e5%af%a6%e7%8f%be%e4%b9%8b%e5%9f%ba%e6%96%bc-mysql","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/160857\/","title":{"rendered":"\u4e92\u806f\u7db2\u696d\u52d9\u51aa\u7b49\u6027\u5be6\u73fe\u4e4b\u57fa\u65bc MySQL"},"content":{"rendered":"

\u4e92\u806f\u7db2\u696d\u52d9\u51aa\u7b49\u6027\u5be6\u73fe\u4e4b\u57fa\u65bc MySQL<\/h1>\n

\u5728\u7576\u4eca\u7684\u4e92\u806f\u7db2\u74b0\u5883\u4e2d\uff0c\u51aa\u7b49\u6027\uff08Idempotence\uff09\u662f\u4e00\u500b\u81f3\u95dc\u91cd\u8981\u7684\u6982\u5ff5\uff0c\u5c24\u5176\u662f\u5728\u5206\u4f48\u5f0f\u7cfb\u7d71\u548c\u5fae\u670d\u52d9\u67b6\u69cb\u4e2d\u3002\u51aa\u7b49\u6027\u6307\u7684\u662f\u5c0d\u540c\u4e00\u64cd\u4f5c\u7684\u591a\u6b21\u57f7\u884c\u4e0d\u6703\u6539\u8b8a\u7cfb\u7d71\u7684\u72c0\u614b\uff0c\u9019\u5c0d\u65bc\u78ba\u4fdd\u7cfb\u7d71\u7684\u7a69\u5b9a\u6027\u548c\u53ef\u9760\u6027\u81f3\u95dc\u91cd\u8981\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u5728\u57fa\u65bc MySQL \u7684\u7cfb\u7d71\u4e2d\u5be6\u73fe\u51aa\u7b49\u6027\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u5efa\u8b70\u3002<\/p>\n

\u51aa\u7b49\u6027\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n

\u51aa\u7b49\u6027\u901a\u5e38\u7528\u65bc\u63cf\u8ff0\u4e00\u500b\u64cd\u4f5c\u7684\u7279\u6027\uff0c\u7121\u8ad6\u8a72\u64cd\u4f5c\u57f7\u884c\u591a\u5c11\u6b21\uff0c\u6700\u7d42\u7684\u7d50\u679c\u90fd\u662f\u76f8\u540c\u7684\u3002\u5728\u7db2\u7d61\u8acb\u6c42\u4e2d\uff0c\u51aa\u7b49\u6027\u610f\u5473\u8457\u5373\u4f7f\u5ba2\u6236\u7aef\u91cd\u8907\u767c\u9001\u76f8\u540c\u7684\u8acb\u6c42\uff0c\u670d\u52d9\u5668\u7684\u72c0\u614b\u4e5f\u4e0d\u6703\u767c\u751f\u8b8a\u5316\u3002\u9019\u5c0d\u65bc\u8655\u7406\u7db2\u7d61\u6545\u969c\u3001\u91cd\u8a66\u6a5f\u5236\u548c\u6578\u64da\u4e00\u81f4\u6027\u975e\u5e38\u91cd\u8981\u3002<\/p>\n

MySQL \u4e2d\u7684\u51aa\u7b49\u6027\u5be6\u73fe<\/h2>\n

\u5728 MySQL \u4e2d\u5be6\u73fe\u51aa\u7b49\u6027\u53ef\u4ee5\u901a\u904e\u591a\u7a2e\u65b9\u5f0f\u9032\u884c\uff0c\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u65b9\u6cd5\uff1a<\/p>\n

1. \u4f7f\u7528\u552f\u4e00\u7d04\u675f<\/h3>\n

\u5728\u6578\u64da\u5eab\u4e2d\uff0c\u53ef\u4ee5\u901a\u904e\u8a2d\u7f6e\u552f\u4e00\u7d04\u675f\u4f86\u78ba\u4fdd\u67d0\u4e9b\u64cd\u4f5c\u7684\u51aa\u7b49\u6027\u3002\u4f8b\u5982\uff0c\u7576\u63d2\u5165\u4e00\u689d\u8a18\u9304\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528\u552f\u4e00\u9375\u4f86\u9632\u6b62\u91cd\u8907\u63d2\u5165\uff1a<\/p>\n

CREATE TABLE orders (\n    order_id INT AUTO_INCREMENT PRIMARY KEY,\n    user_id INT,\n    product_id INT,\n    UNIQUE KEY unique_order (user_id, product_id)\n);\n<\/code><\/pre>\n
\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u5c0d\u65bc\u540c\u4e00\u7528\u6236\u548c\u7522\u54c1\u7684\u8a02\u55ae\uff0c\u53ea\u80fd\u63d2\u5165\u4e00\u6b21\u3002\u5982\u679c\u91cd\u8907\u63d2\u5165\uff0cMySQL \u5c07\u8fd4\u56de\u932f\u8aa4\uff0c\u5f9e\u800c\u4fdd\u8b49\u4e86\u51aa\u7b49\u6027\u3002<\/p>\n
2. \u4f7f\u7528 UPSERT \u64cd\u4f5c<\/h3>\n
MySQL \u63d0\u4f9b\u4e86 INSERT … ON DUPLICATE KEY UPDATE \u8a9e\u53e5\uff0c\u9019\u662f\u4e00\u7a2e\u6709\u6548\u7684\u51aa\u7b49\u6027\u5be6\u73fe\u65b9\u5f0f\u3002\u7576\u63d2\u5165\u7684\u8a18\u9304\u5df2\u5b58\u5728\u6642\uff0c\u53ef\u4ee5\u9078\u64c7\u66f4\u65b0\u8a72\u8a18\u9304\uff0c\u800c\u4e0d\u662f\u63d2\u5165\u65b0\u7684\u8a18\u9304\uff1a<\/p>\n
INSERT INTO orders (user_id, product_id)\nVALUES (1, 100)\nON DUPLICATE KEY UPDATE order_id = LAST_INSERT_ID(order_id);\n<\/code><\/pre>\n
\u9019\u6a23\uff0c\u5373\u4f7f\u591a\u6b21\u57f7\u884c\u76f8\u540c\u7684\u63d2\u5165\u64cd\u4f5c\uff0c\u6700\u7d42\u7684\u7d50\u679c\u4e5f\u4e0d\u6703\u6539\u8b8a\u3002<\/p>\n
3. \u4f7f\u7528\u4e8b\u52d9<\/h3>\n
\u5728\u9032\u884c\u591a\u500b\u64cd\u4f5c\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528\u4e8b\u52d9\u4f86\u78ba\u4fdd\u64cd\u4f5c\u7684\u539f\u5b50\u6027\u3002\u9019\u610f\u5473\u8457\u8981\u9ebc\u6240\u6709\u64cd\u4f5c\u90fd\u6210\u529f\uff0c\u8981\u9ebc\u90fd\u4e0d\u57f7\u884c\u3002\u9019\u6a23\u53ef\u4ee5\u907f\u514d\u56e0\u70ba\u90e8\u5206\u64cd\u4f5c\u6210\u529f\u800c\u5c0e\u81f4\u7684\u6578\u64da\u4e0d\u4e00\u81f4\uff1a<\/p>\n
START TRANSACTION;\n\nINSERT INTO orders (user_id, product_id) VALUES (1, 100);\nUPDATE inventory SET stock = stock - 1 WHERE product_id = 100;\n\nCOMMIT;\n<\/code><\/pre>\n
\u5982\u679c\u5728\u57f7\u884c\u904e\u7a0b\u4e2d\u51fa\u73fe\u932f\u8aa4\uff0c\u53ef\u4ee5\u4f7f\u7528 ROLLBACK \u4f86\u64a4\u92b7\u6240\u6709\u64cd\u4f5c\uff0c\u5f9e\u800c\u4fdd\u6301\u6578\u64da\u7684\u4e00\u81f4\u6027\u3002<\/p>\n
\u51aa\u7b49\u6027\u7684\u91cd\u8981\u6027<\/h2>\n
\u5728\u4e92\u806f\u7db2\u696d\u52d9\u4e2d\uff0c\u51aa\u7b49\u6027\u4e0d\u50c5\u80fd\u63d0\u9ad8\u7cfb\u7d71\u7684\u7a69\u5b9a\u6027\uff0c\u9084\u80fd\u589e\u5f37\u7528\u6236\u9ad4\u9a57\u3002\u7576\u7528\u6236\u767c\u9001\u8acb\u6c42\u6642\uff0c\u4ed6\u5011\u5e0c\u671b\u7cfb\u7d71\u80fd\u5920\u6b63\u78ba\u8655\u7406\uff0c\u800c\u4e0d\u6703\u56e0\u70ba\u91cd\u8907\u8acb\u6c42\u800c\u5c0e\u81f4\u932f\u8aa4\u6216\u6578\u64da\u4e0d\u4e00\u81f4\u3002\u901a\u904e\u5728 MySQL \u4e2d\u5be6\u73fe\u51aa\u7b49\u6027\uff0c\u53ef\u4ee5\u6709\u6548\u964d\u4f4e\u9019\u4e9b\u98a8\u96aa\u3002<\/p>\n
\u7d50\u8ad6<\/h2>\n
\u51aa\u7b49\u6027\u662f\u8a2d\u8a08\u7a69\u5b9a\u548c\u53ef\u9760\u7684\u4e92\u806f\u7db2\u696d\u52d9\u7cfb\u7d71\u7684\u95dc\u9375\u56e0\u7d20\u4e4b\u4e00\u3002\u901a\u904e\u4f7f\u7528\u552f\u4e00\u7d04\u675f\u3001UPSERT \u64cd\u4f5c\u548c\u4e8b\u52d9\u7b49\u6280\u8853\uff0c\u53ef\u4ee5\u5728\u57fa\u65bc MySQL \u7684\u7cfb\u7d71\u4e2d\u6709\u6548\u5730\u5be6\u73fe\u51aa\u7b49\u6027\u3002\u9019\u4e0d\u50c5\u80fd\u63d0\u9ad8\u7cfb\u7d71\u7684\u7a69\u5b9a\u6027\uff0c\u9084\u80fd\u6539\u5584\u7528\u6236\u9ad4\u9a57\uff0c\u5f9e\u800c\u4fc3\u9032\u696d\u52d9\u7684\u6210\u529f\u3002<\/p>\n
\u5982\u9700\u4e86\u89e3\u66f4\u591a\u6709\u95dc \u9999\u6e2fVPS<\/a> \u548c \u96f2\u4f3a\u670d\u5668<\/a> \u7684\u8cc7\u8a0a\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u63a2\u7d22\u5982\u4f55\u57fa\u65bc MySQL \u5be6\u73fe\u4e92\u806f\u7db2\u696d\u52d9\u7684\u51aa\u7b49\u6027\uff0c\u78ba\u4fdd\u6578\u64da\u4e00\u81f4\u6027\u8207\u7cfb\u7d71\u7a69\u5b9a\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-160857","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160857","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=160857"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160857\/revisions"}],"predecessor-version":[{"id":160858,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160857\/revisions\/160858"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=160857"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=160857"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=160857"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}