{"id":200073,"date":"2025-05-06T12:23:16","date_gmt":"2025-05-06T04:23:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/200073\/"},"modified":"2025-05-06T12:23:16","modified_gmt":"2025-05-06T04:23:16","slug":"%e5%ae%9e%e4%be%8b%e5%b1%95%e7%a4%bamysql%e8%a7%a6%e5%8f%91%e5%99%a8%e5%8f%82%e6%95%b0%e7%9a%84%e5%ae%9e%e7%94%a8%e6%8a%80%e5%b7%a7","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/200073\/","title":{"rendered":"\u5b9e\u4f8b\u5c55\u793aMySQL\u89e6\u53d1\u5668\u53c2\u6570\u7684\u5b9e\u7528\u6280\u5de7"},"content":{"rendered":"

<\/b> <\/p>\n

\u5b9e\u4f8b\u5c55\u793aMySQL\u89e6\u53d1\u5668\u53c2\u6570\u7684\u5b9e\u7528\u6280\u5de7<\/h1>\n

MySQL\u89e6\u53d1\u5668\u53c2\u6570\u5305\u62ecOLD\u548cNEW\uff0c\u5206\u522b\u4ee3\u8868\u89e6\u53d1\u4e8b\u4ef6\u524d\u540e\u7684\u8868\u6570\u636e\u72b6\u6001\u3002\u901a\u8fc7\u7075\u6d3b\u8fd0\u7528\u8fd9\u4e9b\u53c2\u6570\uff0c\u53ef\u4ee5\u63d0\u5347\u89e6\u53d1\u5668\u7684\u6548\u7387\u548c\u53ef\u9760\u6027\u3002\u672c\u6587\u5c06\u63a2\u8ba8MySQL\u89e6\u53d1\u5668\u53c2\u6570\u7684\u5b9e\u7528\u5e94\u7528\u6280\u5de7\uff0c\u5e76\u63d0\u4f9b\u5177\u4f53\u7684\u4ee3\u7801\u793a\u4f8b\uff0c\u5305\u62ec\u6570\u636e\u6bd4\u8f83\u3001\u6570\u636e\u5904\u7406\u7b49\u5e38\u89c1\u573a\u666f\u3002<\/p>\n

MySQL\u89e6\u53d1\u5668\u662f\u4e00\u79cd\u5728\u6307\u5b9a\u8868\u4e0a\u6267\u884c\u89e6\u53d1\u4e8b\u4ef6\u65f6\u81ea\u52a8\u6267\u884c\u7684\u52a8\u4f5c\uff0c\u53ef\u7528\u4e8e\u7ba1\u7406\u548c\u7ef4\u62a4\u6570\u636e\u5e93\u7684\u6570\u636e\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u3002\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u89e6\u53d1\u5668\u53c2\u6570\u7684\u7075\u6d3b\u8fd0\u7528\u53ef\u4ee5\u63d0\u9ad8\u6570\u636e\u5e93\u7684\u6548\u7387\u548c\u53ef\u9760\u6027\u3002\u672c\u6587\u5c06\u63a2\u8ba8MySQL\u89e6\u53d1\u5668\u53c2\u6570\u7684\u5b9e\u9645\u5e94\u7528\u6280\u5de7\uff0c\u5e76\u9644\u4e0a\u5177\u4f53\u7684\u4ee3\u7801\u793a\u4f8b\u3002<\/p>\n

1. \u89e6\u53d1\u5668\u53c2\u6570\u6982\u8ff0<\/h3>\n

MySQL\u89e6\u53d1\u5668\u53c2\u6570\u5305\u62ecOLD\u548cNEW\uff0c\u5206\u522b\u4ee3\u8868\u5728\u89e6\u53d1\u4e8b\u4ef6\u4e4b\u524d\u548c\u4e4b\u540e\u7684\u8868\u6570\u636e\u72b6\u6001\u3002\u8fd9\u4e24\u4e2a\u53c2\u6570\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u5728\u89e6\u53d1\u5668\u4e2d\u83b7\u53d6\u548c\u6bd4\u8f83\u6570\u636e\uff0c\u4ece\u800c\u505a\u51fa\u76f8\u5e94\u7684\u5904\u7406\u3002<\/p>\n

2. \u89e6\u53d1\u5668\u53c2\u6570\u7684\u5e94\u7528\u6280\u5de7<\/h3>\n

2.1 \u4f7f\u7528OLD\u53c2\u6570\u8fdb\u884c\u6570\u636e\u6bd4\u8f83<\/h4>\n

\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u7528\u6237\u8868users<\/code>\uff0c\u5176\u4e2d\u5305\u542bid<\/code>\uff0cusername<\/code>\u548cemail<\/code>\u5b57\u6bb5\u3002\u6211\u4eec\u53ef\u4ee5\u7f16\u5199\u4e00\u4e2aBEFORE UPDATE\u89e6\u53d1\u5668\uff0c\u5728\u6bcf\u6b21\u66f4\u65b0\u7528\u6237\u4fe1\u606f\u65f6\uff0c\u68c0\u67e5\u7528\u6237\u7684\u90ae\u7bb1\u5730\u5740\u662f\u5426\u53d1\u751f\u53d8\u5316\u3002\u5982\u679c\u90ae\u7bb1\u5730\u5740\u6709\u53d8\u5316\uff0c\u53ef\u4ee5\u8fdb\u884c\u76f8\u5e94\u7684\u64cd\u4f5c\u3002<\/p>\n

DELIMITER \/\/\nCREATE TRIGGER check_email_change\nBEFORE UPDATE ON users\nFOR EACH ROW\nBEGIN\n    IF OLD.email <> NEW.email THEN\n        -- \u90ae\u7bb1\u5730\u5740\u53d1\u751f\u53d8\u5316\uff0c\u53ef\u4ee5\u6dfb\u52a0\u76f8\u5173\u5904\u7406\u903b\u8f91\n        INSERT INTO email_change_logs (user_id, old_email, new_email, change_time)\n        VALUES (OLD.id, OLD.email, NEW.email, NOW());\n    END IF;\nEND;\n\/\/\nDELIMITER ;<\/pre>\n
\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u901a\u8fc7\u6bd4\u8f83OLD\u548cNEW\u53c2\u6570\u7684\u90ae\u7bb1\u5730\u5740\u5b57\u6bb5\uff0c\u8fdb\u884c\u4e86\u76f8\u5e94\u7684\u5904\u7406\u3002\u5982\u679c\u90ae\u7bb1\u5730\u5740\u6709\u53d8\u5316\uff0c\u5c06\u53d8\u5316\u8bb0\u5f55\u63d2\u5165\u5230email_change_logs<\/code>\u8868\u4e2d\u3002<\/p>\n
2.2 \u4f7f\u7528NEW\u53c2\u6570\u8fdb\u884c\u6570\u636e\u5904\u7406<\/h4>\n
\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u53ef\u80fd\u5e0c\u671b\u6839\u636e\u65b0\u63d2\u5165\u7684\u6570\u636e\u8fdb\u884c\u4e00\u4e9b\u989d\u5916\u7684\u64cd\u4f5c\u3002\u4f8b\u5982\uff0c\u5f53\u63d2\u5165\u65b0\u7528\u6237\u65f6\uff0c\u6211\u4eec\u53ef\u4ee5\u81ea\u52a8\u751f\u6210\u7528\u6237\u7f16\u53f7\u5e76\u63d2\u5165\u5230\u53e6\u4e00\u4e2a\u5173\u8054\u8868\u4e2d\u3002<\/p>\n
DELIMITER \/\/\nCREATE TRIGGER generate_user_id\nBEFORE INSERT ON users\nFOR EACH ROW\nBEGIN\n    SET NEW.id = CONCAT('U', LPAD((SELECT MAX(SUBSTR(id, 2))+1 FROM users), 5, '0'));\n    -- \u751f\u6210\u7528\u6237\u7f16\u53f7\u5e76\u63d2\u5165\u5230\u53e6\u4e00\u4e2a\u8868\n    INSERT INTO user_ids (user_id, creation_time)\n    VALUES (NEW.id, NOW());\nEND;\n\/\/\nDELIMITER ;<\/pre>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528NEW\u53c2\u6570\u5728\u7528\u6237\u63d2\u5165\u524d\u751f\u6210\u7528\u6237\u7f16\u53f7\uff0c\u5e76\u5c06\u7528\u6237\u7f16\u53f7\u548c\u521b\u5efa\u65f6\u95f4\u63d2\u5165\u5230user_ids<\/code>\u8868\u4e2d\u3002<\/p>\n
3. \u603b\u7ed3<\/h3>\n
MySQL\u89e6\u53d1\u5668\u53c2\u6570\u7684\u7075\u6d3b\u8fd0\u7528\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u66f4\u597d\u5730\u7ba1\u7406\u548c\u7ef4\u62a4\u6570\u636e\u5e93\u6570\u636e\u3002\u901a\u8fc7\u5bf9OLD\u548cNEW\u53c2\u6570\u7684\u5408\u7406\u4f7f\u7528\uff0c\u6211\u4eec\u53ef\u4ee5\u5b9e\u73b0\u66f4\u52a0\u667a\u80fd\u548c\u9ad8\u6548\u7684\u6570\u636e\u5e93\u64cd\u4f5c\u3002\u5728\u7f16\u5199\u89e6\u53d1\u5668\u65f6\uff0c\u5e94\u6839\u636e\u5177\u4f53\u9700\u6c42\u9009\u62e9\u9002\u5f53\u7684\u53c2\u6570\uff0c\u5e76\u7ed3\u5408\u5177\u4f53\u4e1a\u52a1\u903b\u8f91\u8fdb\u884c\u5904\u7406\uff0c\u4ee5\u63d0\u5347\u6570\u636e\u5e93\u64cd\u4f5c\u7684\u7cbe\u786e\u6027\u548c\u6548\u7387\u3002<\/p>\n
\u4ee5\u4e0a\u5c31\u662f\u672c\u6587\u7684\u5168\u90e8\u5185\u5bb9\u4e86\uff0c\u662f\u5426\u6709\u987a\u5229\u5e2e\u52a9\u4f60\u89e3\u51b3\u95ee\u9898\uff1f\u82e5\u662f\u80fd\u7ed9\u4f60\u5e26\u6765\u5b66\u4e60\u4e0a\u7684\u5e2e\u52a9\uff0c\u8bf7\u5927\u5bb6\u591a\u591a\u652f\u6301\u4e3b\u673a\u5b9d\u8d1d\uff01\u66f4\u591a\u5173\u4e8e\u6570\u636e\u5e93\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u4e5f\u53ef\u5173\u6ce8\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\u3002<\/p>\n
\n
\n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"
\u5b9e\u4f8b\u5c55\u793aMySQL\u89e6\u53d1\u5668\u53c2\u6570\u7684\u5b9e...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-200073","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200073","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"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=200073"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200073\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=200073"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=200073"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=200073"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}