{"id":200095,"date":"2025-05-06T08:14:24","date_gmt":"2025-05-06T00:14:24","guid":{"rendered":"https:\/\/server.hk\/cnblog\/200095\/"},"modified":"2025-05-06T08:14:24","modified_gmt":"2025-05-06T00:14:24","slug":"mysql%e8%a7%a6%e5%8f%91%e5%99%a8%e7%9a%84%e5%8a%9f%e8%83%bd%e5%92%8c%e5%ae%9e%e7%8e%b0%e6%9c%ba%e5%88%b6%e6%b7%b1%e5%85%a5%e6%8e%a2%e7%a9%b6","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/200095\/","title":{"rendered":"MySQL\u89e6\u53d1\u5668\u7684\u529f\u80fd\u548c\u5b9e\u73b0\u673a\u5236\u6df1\u5165\u63a2\u7a76"},"content":{"rendered":"

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

MySQL\u89e6\u53d1\u5668\u7684\u529f\u80fd\u548c\u5b9e\u73b0\u673a\u5236\u6df1\u5165\u63a2\u7a76<\/h1>\n

MySQL\u89e6\u53d1\u5668\u662f\u4e00\u79cd\u6570\u636e\u5e93\u5bf9\u8c61\uff0c\u5f53\u6307\u5b9a\u7684\u6570\u636e\u5e93\u4e8b\u4ef6\u53d1\u751f\u65f6\u81ea\u52a8\u6267\u884c\u9884\u5b9a\u4e49\u7684\u64cd\u4f5c\u3002\u89e6\u53d1\u5668\u5728\u6570\u636e\u5e93\u4e2d\u5b9e\u73b0\u4e1a\u52a1\u89c4\u5219\u3001\u89e6\u53d1\u590d\u6742\u64cd\u4f5c\u3001\u63d0\u9ad8\u6027\u80fd\u548c\u4fdd\u8bc1\u6570\u636e\u5b8c\u6574\u6027\u65b9\u9762\u53d1\u6325\u7740\u91cd\u8981\u4f5c\u7528\u3002\u5176\u673a\u5236\u57fa\u4e8e\u4e8b\u4ef6\u9a71\u52a8\uff0c\u53ef\u4ee5\u5728\u6570\u636e\u63d2\u5165\u3001\u66f4\u65b0\u6216\u5220\u9664\u65f6\u89e6\u53d1\u76f8\u5e94\u7684\u64cd\u4f5c\u3002\u89e6\u53d1\u5668\u5305\u62ecBEFORE\u548cAFTER\u4e24\u79cd\u7c7b\u578b\uff0c\u5206\u522b\u8868\u793a\u5728\u89e6\u53d1\u4e8b\u4ef6\u4e4b\u524d\u548c\u4e4b\u540e\u6267\u884c\u64cd\u4f5c\u3002<\/p>\n

MySQL\u4e2d\u7684\u89e6\u53d1\u5668\u662f\u4e00\u79cd\u7279\u6b8a\u7684\u6570\u636e\u5e93\u5bf9\u8c61\uff0c\u5176\u53ef\u4ee5\u5728\u6307\u5b9a\u7684\u6570\u636e\u5e93\u4e8b\u4ef6\u53d1\u751f\u65f6\u81ea\u52a8\u6267\u884c\u9884\u5b9a\u4e49\u7684\u64cd\u4f5c\u3002\u901a\u8fc7\u89e6\u53d1\u5668\uff0c\u6211\u4eec\u53ef\u4ee5\u5b9e\u73b0\u5728\u6570\u636e\u5e93\u4e2d\u5b9a\u4e49\u7684\u64cd\u4f5c\uff0c\u4f8b\u5982\u66f4\u65b0\u3001\u63d2\u5165\u6216\u5220\u9664\u6570\u636e\u65f6\u89e6\u53d1\u67d0\u4e9b\u989d\u5916\u7684\u529f\u80fd\u6216\u903b\u8f91\u3002\u5728\u672c\u6587\u4e2d\uff0c\u5c06\u6df1\u5165\u63a2\u8ba8MySQL\u89e6\u53d1\u5668\u7684\u4f5c\u7528\u4e0e\u673a\u5236\uff0c\u5e76\u63d0\u4f9b\u5177\u4f53\u7684\u4ee3\u7801\u793a\u4f8b\u3002<\/p>\n

1. MySQL\u89e6\u53d1\u5668\u7684\u4f5c\u7528<\/h2>\n

MySQL\u89e6\u53d1\u5668\u7684\u4e3b\u8981\u4f5c\u7528\u5305\u62ec\u4ee5\u4e0b\u51e0\u4e2a\u65b9\u9762\uff1a<\/p>\n

1.1 \u5b9e\u73b0\u4e1a\u52a1\u89c4\u5219<\/h3>\n

\u901a\u8fc7\u89e6\u53d1\u5668\uff0c\u53ef\u4ee5\u5728\u6570\u636e\u5e93\u5c42\u9762\u5b9e\u73b0\u4e1a\u52a1\u89c4\u5219\uff0c\u786e\u4fdd\u6570\u636e\u64cd\u4f5c\u7684\u4e00\u81f4\u6027\u548c\u6b63\u786e\u6027\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u5728\u63d2\u5165\u6570\u636e\u65f6\u81ea\u52a8\u8ba1\u7b97\u67d0\u4e2a\u5b57\u6bb5\u7684\u503c\uff0c\u6216\u5728\u66f4\u65b0\u64cd\u4f5c\u65f6\u81ea\u52a8\u8bb0\u5f55\u64cd\u4f5c\u65e5\u5fd7\u3002<\/p>\n

1.2 \u89e6\u53d1\u590d\u6742\u64cd\u4f5c<\/h3>\n

\u89e6\u53d1\u5668\u53ef\u4ee5\u89e6\u53d1\u590d\u6742\u7684\u64cd\u4f5c\uff0c\u4f8b\u5982\u5728\u6570\u636e\u66f4\u65b0\u65f6\u89e6\u53d1\u5173\u8054\u8868\u7684\u64cd\u4f5c\uff0c\u6216\u5728\u5220\u9664\u6570\u636e\u65f6\u89e6\u53d1\u7ea7\u8054\u5220\u9664\u3002<\/p>\n

1.3 \u63d0\u9ad8\u6027\u80fd<\/h3>\n

\u4f7f\u7528\u89e6\u53d1\u5668\u53ef\u4ee5\u51cf\u5c11\u5e94\u7528\u7a0b\u5e8f\u4e0e\u6570\u636e\u5e93\u4e4b\u95f4\u7684\u901a\u4fe1\u6b21\u6570\uff0c\u63d0\u9ad8\u7cfb\u7edf\u6027\u80fd\u3002\u53e6\u5916\uff0c\u901a\u8fc7\u89e6\u53d1\u5668\u53ef\u4ee5\u5c06\u4e00\u4e9b\u5e38\u89c1\u7684\u903b\u8f91\u64cd\u4f5c\u5c01\u88c5\u5728\u6570\u636e\u5e93\u4e2d\uff0c\u51cf\u5c11\u91cd\u590d\u4ee3\u7801\u7684\u7f16\u5199\u3002<\/p>\n

1.4 \u5b9e\u73b0\u6570\u636e\u5b8c\u6574\u6027<\/h3>\n

\u901a\u8fc7\u89e6\u53d1\u5668\u53ef\u4ee5\u5728\u6570\u636e\u64cd\u4f5c\u524d\u8fdb\u884c\u6821\u9a8c\uff0c\u786e\u4fdd\u6570\u636e\u7684\u5b8c\u6574\u6027\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u5728\u63d2\u5165\u6570\u636e\u524d\u5bf9\u8f93\u5165\u6570\u636e\u8fdb\u884c\u9a8c\u8bc1\uff0c\u907f\u514d\u63d2\u5165\u4e0d\u7b26\u5408\u89c4\u5219\u7684\u6570\u636e\u3002<\/p>\n

2. MySQL\u89e6\u53d1\u5668\u7684\u673a\u5236<\/h2>\n

MySQL\u89e6\u53d1\u5668\u57fa\u4e8e\u4e8b\u4ef6\u9a71\u52a8\u7684\u673a\u5236\uff0c\u53ef\u4ee5\u5728\u6570\u636e\u7684\u63d2\u5165\u3001\u66f4\u65b0\u6216\u5220\u9664\u65f6\u89e6\u53d1\u76f8\u5e94\u7684\u64cd\u4f5c\u3002\u89e6\u53d1\u5668\u5305\u62ecBEFORE<\/code>\u548cAFTER<\/code>\u4e24\u79cd\u7c7b\u578b\uff0c\u5206\u522b\u8868\u793a\u5728\u89e6\u53d1\u4e8b\u4ef6\u4e4b\u524d\u548c\u4e4b\u540e\u6267\u884c\u89e6\u53d1\u5668\u4e2d\u5b9a\u4e49\u7684\u64cd\u4f5c\u3002<\/p>\n

2.1 \u521b\u5efa\u89e6\u53d1\u5668<\/h3>\n

\u521b\u5efa\u89e6\u53d1\u5668\u7684\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n

CREATE TRIGGER trigger_name\nBEFORE\/AFTER INSERT\/UPDATE\/DELETE ON table_name\nFOR EACH ROW\nBEGIN\n    -- \u89e6\u53d1\u5668\u64cd\u4f5c\nEND;<\/pre>\n
\u5176\u4e2d\uff0cBEFORE<\/code>\u6216AFTER<\/code>\u8868\u793a\u89e6\u53d1\u65f6\u673a\uff0cINSERT<\/code>\u3001UPDATE<\/code>\u6216DELETE<\/code>\u8868\u793a\u89e6\u53d1\u7684\u64cd\u4f5c\u7c7b\u578b\uff0ctable_name<\/code>\u4e3a\u89e6\u53d1\u7684\u8868\u540d\uff0cFOR EACH ROW<\/code>\u8868\u793a\u6bcf\u884c\u89e6\u53d1\u4e00\u6b21\u3002<\/p>\n
2.2 \u89e6\u53d1\u5668\u64cd\u4f5c<\/h3>\n
\u5728BEGIN<\/code>\u548cEND<\/code>\u4e4b\u95f4\u53ef\u4ee5\u7f16\u5199\u89e6\u53d1\u5668\u4e2d\u8981\u6267\u884c\u7684\u64cd\u4f5c\uff0c\u53ef\u4ee5\u662fSQL\u8bed\u53e5\u3001\u5b58\u50a8\u8fc7\u7a0b\u6216\u51fd\u6570\u8c03\u7528\u7b49\u3002\u5728BEFORE<\/code>\u89e6\u53d1\u5668\u4e2d\uff0c\u53ef\u4ee5\u4fee\u6539NEW<\/code>\u5173\u952e\u5b57\u8868\u793a\u65b0\u6570\u636e\u7684\u503c\uff0c\u5728AFTER<\/code>\u89e6\u53d1\u5668\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528OLD<\/code>\u5173\u952e\u5b57\u8868\u793a\u65e7\u6570\u636e\u7684\u503c\u3002<\/p>\n
2.3 \u5220\u9664\u89e6\u53d1\u5668<\/h3>\n
\u5220\u9664\u89e6\u53d1\u5668\u7684\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n
DROP TRIGGER IF EXISTS trigger_name;<\/pre>\n
3. \u793a\u4f8b\u4ee3\u7801<\/h2>\n
\u4e0b\u9762\u901a\u8fc7\u4e00\u4e2a\u5177\u4f53\u7684\u793a\u4f8b\u6765\u6f14\u793aMySQL\u89e6\u53d1\u5668\u7684\u5e94\u7528\uff1a<\/p>\n
\u5047\u8bbe\u6709\u4e00\u4e2a\u5b66\u751f\u8868students<\/code>\uff0c\u5176\u4e2d\u5305\u62ecname<\/code>\u3001age<\/code>\u548ctotal_score<\/code>\u5b57\u6bb5\uff0c\u6211\u4eec\u5e0c\u671b\u5728\u63d2\u5165\u65b0\u6570\u636e\u65f6\u81ea\u52a8\u8ba1\u7b97\u603b\u6210\u7ee9\uff0c\u5e76\u5c06\u7ed3\u679c\u4fdd\u5b58\u5230total_score<\/code>\u5b57\u6bb5\u4e2d\u3002<\/p>\n
\u9996\u5148\u521b\u5efa\u89e6\u53d1\u5668\uff1a<\/p>\n
DELIMITER \/\/\nCREATE TRIGGER calculate_total_score\nBEFORE INSERT ON students\nFOR EACH ROW\nBEGIN\n    SET NEW.total_score = NEW.math_score + NEW.english_score + NEW.history_score;\nEND;\n\/\/\nDELIMITER ;<\/pre>\n
\u7136\u540e\u63d2\u5165\u6570\u636e\u4f1a\u81ea\u52a8\u89e6\u53d1\u8be5\u89e6\u53d1\u5668\uff1a<\/p>\n
INSERT INTO students (name, age, math_score, english_score, history_score) VALUES ('\u5f20\u4e09', 20, 80, 85, 75);<\/pre>\n
\u6b64\u65f6\u89e6\u53d1\u5668\u4f1a\u81ea\u52a8\u8ba1\u7b97\u603b\u6210\u7ee9\uff0c\u5e76\u5c06\u7ed3\u679c\u4fdd\u5b58\u5230total_score<\/code>\u5b57\u6bb5\u4e2d\u3002<\/p>\n
\u7ed3\u8bed<\/h2>\n
\u901a\u8fc7\u4ee5\u4e0a\u793a\u4f8b\uff0c\u6211\u4eec\u6df1\u5165\u63a2\u8ba8\u4e86MySQL\u89e6\u53d1\u5668\u7684\u4f5c\u7528\u4e0e\u673a\u5236\uff0c\u5e76\u7ed9\u51fa\u4e86\u5177\u4f53\u7684\u4ee3\u7801\u793a\u4f8b\u3002\u89e6\u53d1\u5668\u662f\u4e00\u4e2a\u5f3a\u5927\u7684\u6570\u636e\u5e93\u5de5\u5177\uff0c\u53ef\u4ee5\u5728\u6570\u636e\u5e93\u5c42\u9762\u5b9e\u73b0\u590d\u6742\u7684\u4e1a\u52a1\u903b\u8f91\u548c\u64cd\u4f5c\u3002\u5408\u7406\u5730\u5e94\u7528\u89e6\u53d1\u5668\u53ef\u4ee5\u63d0\u9ad8\u6570\u636e\u5e93\u7684\u6027\u80fd\u548c\u6570\u636e\u4e00\u81f4\u6027\uff0c\u662f\u6570\u636e\u5e93\u5f00\u53d1\u4e2d\u4e0d\u53ef\u6216\u7f3a\u7684\u4e00\u90e8\u5206\u3002\u5e0c\u671b\u672c\u6587\u5bf9\u8bfb\u8005\u6709\u6240\u5e2e\u52a9\uff0c\u8c22\u8c22\u9605\u8bfb\uff01<\/p>\n
\u6587\u4e2d\u5173\u4e8emysql,\u89e6\u53d1\u5668,\u4f5c\u7528\u7684\u77e5\u8bc6\u4ecb\u7ecd\uff0c\u5e0c\u671b\u5bf9\u4f60\u7684\u5b66\u4e60\u6709\u6240\u5e2e\u52a9\uff01\u82e5\u662f\u53d7\u76ca\u532a\u6d45\uff0c\u90a3\u5c31\u52a8\u52a8\u9f20\u6807\u6536\u85cf\u8fd9\u7bc7\u300aMySQL\u89e6\u53d1\u5668\u7684\u529f\u80fd\u548c\u5b9e\u73b0\u673a\u5236\u6df1\u5165\u63a2\u7a76\u300b\u6587\u7ae0\u5427\uff0c\u4e5f\u53ef\u5173\u6ce8\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\u4e86\u89e3\u76f8\u5173\u6280\u672f\u6587\u7ae0\u3002<\/p>\n
\n
\n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"
MySQL\u89e6\u53d1\u5668\u7684\u529f\u80fd\u548c\u5b9e\u73b0\u673a\u5236...<\/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-200095","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200095","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=200095"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200095\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=200095"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=200095"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=200095"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}