{"id":200086,"date":"2025-05-06T11:41:00","date_gmt":"2025-05-06T03:41:00","guid":{"rendered":"https:\/\/server.hk\/cnblog\/200086\/"},"modified":"2025-05-06T11:41:00","modified_gmt":"2025-05-06T03:41:00","slug":"%e5%a6%82%e4%bd%95%e5%9c%a8mysql%e8%a7%a6%e5%8f%91%e5%99%a8%e4%b8%ad%e4%bc%a0%e9%80%92%e5%8f%82%e6%95%b0","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/200086\/","title":{"rendered":"\u5982\u4f55\u5728MySQL\u89e6\u53d1\u5668\u4e2d\u4f20\u9012\u53c2\u6570"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>\u5982\u4f55\u5728MySQL\u89e6\u53d1\u5668\u4e2d\u4f20\u9012\u53c2\u6570<\/h1>\n<p>MySQL\u89e6\u53d1\u5668\u662f\u4e00\u79cd\u76d1\u63a7\u8868\u6570\u636e\u53d8\u5316\u5e76\u6267\u884c\u76f8\u5e94\u64cd\u4f5c\u7684\u5f3a\u5927\u529f\u80fd\u3002\u5728MySQL\u89e6\u53d1\u5668\u4e2d\u4f7f\u7528\u53c2\u6570\u53ef\u4ee5\u4f20\u9012\u6570\u636e\uff0c\u6839\u636e\u4f20\u9012\u7684\u6570\u636e\u6267\u884c\u76f8\u5e94\u7684\u64cd\u4f5c\u3002\u901a\u8fc7\u5b9a\u4e49\u53c2\u6570\uff0c\u53ef\u4ee5\u589e\u5f3a\u89e6\u53d1\u5668\u7684\u7075\u6d3b\u6027\uff0c\u4f7f\u5176\u80fd\u591f\u9002\u5e94\u4e0d\u540c\u7684\u6570\u636e\u5904\u7406\u9700\u6c42\u3002\u672c\u6587\u5c06\u4ecb\u7ecd\u5982\u4f55\u5728MySQL\u89e6\u53d1\u5668\u4e2d\u4f7f\u7528\u53c2\u6570\uff0c\u5e76\u63d0\u4f9b\u5177\u4f53\u7684\u4ee3\u7801\u793a\u4f8b\uff0c\u5e2e\u52a9\u8bfb\u8005\u66f4\u597d\u5730\u7406\u89e3\u548c\u4f7f\u7528\u89e6\u53d1\u5668\u4e2d\u7684\u53c2\u6570\uff0c\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\u53d1\u6325\u5176\u4f5c\u7528\u3002<\/p>\n<p>\u5982\u4f55\u5728MySQL\u89e6\u53d1\u5668\u4e2d\u4f7f\u7528\u53c2\u6570\uff0c\u9700\u8981\u5177\u4f53\u4ee3\u7801\u793a\u4f8b<\/p>\n<p>MySQL\u662f\u4e00\u79cd\u6d41\u884c\u7684\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\uff0c\u5b83\u652f\u6301\u89e6\u53d1\u5668\u6765\u76d1\u63a7\u8868\u4e2d\u6570\u636e\u7684\u53d8\u5316\u5e76\u6267\u884c\u76f8\u5e94\u7684\u64cd\u4f5c\u3002\u89e6\u53d1\u5668\u53ef\u4ee5\u5728INSERT\u3001UPDATE\u6216DELETE\u64cd\u4f5c\u53d1\u751f\u65f6\u89e6\u53d1\uff0c\u662f\u4e00\u79cd\u5f3a\u5927\u7684\u6570\u636e\u5e93\u529f\u80fd\uff0c\u53ef\u4ee5\u7528\u4e8e\u5b9e\u73b0\u6570\u636e\u7ea6\u675f\u3001\u65e5\u5fd7\u8bb0\u5f55\u3001\u6570\u636e\u540c\u6b65\u7b49\u9700\u6c42\u3002\u5728MySQL\u4e2d\uff0c\u89e6\u53d1\u5668\u53ef\u4ee5\u4f7f\u7528\u53c2\u6570\u6765\u4f20\u9012\u6570\u636e\uff0c\u901a\u8fc7\u53c2\u6570\u53ef\u4ee5\u7075\u6d3b\u5730\u5b9a\u5236\u89e6\u53d1\u5668\u7684\u884c\u4e3a\u3002\u672c\u6587\u5c06\u4ecb\u7ecd\u5982\u4f55\u5728MySQL\u89e6\u53d1\u5668\u4e2d\u4f7f\u7528\u53c2\u6570\uff0c\u5e76\u63d0\u4f9b\u5177\u4f53\u7684\u4ee3\u7801\u793a\u4f8b\u3002<\/p>\n<p>\u9996\u5148\uff0c\u6211\u4eec\u9700\u8981\u4e86\u89e3\u5728MySQL\u4e2d\u5982\u4f55\u521b\u5efa\u89e6\u53d1\u5668\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u521b\u5efa\u89e6\u53d1\u5668\u7684\u8bed\u6cd5\u793a\u4f8b\uff1a<\/p>\n<pre>CREATE TRIGGER trigger_name\nBEFORE INSERT ON table_name\nFOR EACH ROW\nBEGIN\n    -- \u89e6\u53d1\u5668\u6267\u884c\u7684\u903b\u8f91\nEND;<\/pre>\n<p>\u5728\u4e0a\u9762\u7684\u8bed\u6cd5\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u89e6\u53d1\u5668\u53ef\u4ee5\u5728INSERT\u64cd\u4f5c\u53d1\u751f\u524d\uff08BEFORE INSERT\uff09\u6216\u8005\u4e4b\u540e\uff08AFTER INSERT\uff09\u6267\u884c\u3002\u89e6\u53d1\u5668\u4e2d\u7684\u903b\u8f91\u901a\u8fc7BEGIN\u548cEND\u5173\u952e\u5b57\u5305\u88f9\uff0c\u53ef\u4ee5\u5305\u542b\u4e00\u7cfb\u5217\u7684SQL\u8bed\u53e5\u3002<\/p>\n<p>\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c06\u4ecb\u7ecd\u5982\u4f55\u5728\u89e6\u53d1\u5668\u4e2d\u4f7f\u7528\u53c2\u6570\u3002\u5728MySQL\u7684\u89e6\u53d1\u5668\u4e2d\uff0c\u53ef\u4ee5\u5b9a\u4e49\u53c2\u6570\u5e76\u5728\u89e6\u53d1\u5668\u903b\u8f91\u4e2d\u4f7f\u7528\u8fd9\u4e9b\u53c2\u6570\u3002\u53c2\u6570\u53ef\u4ee5\u4f20\u9012\u6570\u636e\u7ed9\u89e6\u53d1\u5668\uff0c\u5e76\u6839\u636e\u4f20\u9012\u7684\u6570\u636e\u6267\u884c\u76f8\u5e94\u7684\u64cd\u4f5c\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u4f7f\u7528\u53c2\u6570\u7684\u89e6\u53d1\u5668\u793a\u4f8b\uff1a<\/p>\n<pre>DELIMITER \/\/\nCREATE TRIGGER calculate_salary\nBEFORE INSERT ON employee\nFOR EACH ROW\nBEGIN\n    DECLARE salary INT;\n    SET salary = NEW.base_salary + NEW.bonus;\n    SET NEW.total_salary = salary;\nEND;\n\/\/\nDELIMITER ;<\/pre>\n<p>\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u521b\u5efa\u4e86\u4e00\u4e2a\u540d\u4e3acalculate_salary\u7684\u89e6\u53d1\u5668\uff0c\u5728\u5458\u5de5\u8868(employee)\u7684\u63d2\u5165\u64cd\u4f5c\u53d1\u751f\u524d\u6267\u884c\u3002\u89e6\u53d1\u5668\u4e2d\u5b9a\u4e49\u4e86\u4e00\u4e2a\u540d\u4e3asalary\u7684\u5c40\u90e8\u53d8\u91cf\uff0c\u5e76\u5c06\u8ba1\u7b97\u5f97\u5230\u7684\u603b\u85aa\u6c34\u8d4b\u503c\u7ed9total_salary\u5b57\u6bb5\u3002\u5728\u89e6\u53d1\u5668\u4e2d\u4f7f\u7528\u7684NEW\u5173\u952e\u5b57\u8868\u793a\u63d2\u5165\u64cd\u4f5c\u7684\u65b0\u6570\u636e\u3002<\/p>\n<p>\u5728\u5b9e\u9645\u7684\u4e1a\u52a1\u573a\u666f\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u6839\u636e\u5177\u4f53\u9700\u6c42\u5728\u89e6\u53d1\u5668\u4e2d\u5b9a\u4e49\u53c2\u6570\uff0c\u5e76\u6839\u636e\u53c2\u6570\u6267\u884c\u76f8\u5e94\u7684\u903b\u8f91\u3002\u901a\u8fc7\u4f7f\u7528\u53c2\u6570\uff0c\u6211\u4eec\u53ef\u4ee5\u589e\u5f3a\u89e6\u53d1\u5668\u7684\u7075\u6d3b\u6027\uff0c\u4f7f\u5176\u80fd\u591f\u9002\u5e94\u4e0d\u540c\u7684\u6570\u636e\u5904\u7406\u9700\u6c42\u3002<\/p>\n<p>\u603b\u7684\u6765\u8bf4\uff0c\u5728MySQL\u89e6\u53d1\u5668\u4e2d\u4f7f\u7528\u53c2\u6570\u662f\u4e00\u79cd\u5f3a\u5927\u7684\u6280\u6727\uff0c\u901a\u8fc7\u5408\u7406\u5730\u5b9a\u4e49\u53c2\u6570\uff0c\u5728\u89e6\u53d1\u5668\u4e2d\u53ef\u4ee5\u5b9e\u73b0\u66f4\u52a0\u7075\u6d3b\u548c\u4e2a\u6027\u5316\u7684\u6570\u636e\u5904\u7406\u903b\u8f91\u3002\u5728\u7f16\u5199\u89e6\u53d1\u5668\u903b\u8f91\u65f6\uff0c\u52a1\u5fc5\u6ce8\u610f\u53c2\u6570\u7684\u5b9a\u4e49\u548c\u4f7f\u7528\uff0c\u786e\u4fdd\u903b\u8f91\u6b63\u786e\u6027\u548c\u6027\u80fd\u9ad8\u6548\u6027\u3002\u5e0c\u671b\u672c\u6587\u80fd\u591f\u5e2e\u52a9\u8bfb\u8005\u66f4\u597d\u5730\u7406\u89e3MySQL\u89e6\u53d1\u5668\u4e2d\u53c2\u6570\u7684\u4f7f\u7528\u65b9\u6cd5\uff0c\u5e76\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\u53d1\u6325\u5176\u4f5c\u7528\u3002<\/p>\n<p>\u7406\u8bba\u8981\u638c\u63e1\uff0c\u5b9e\u64cd\u4e0d\u80fd\u843d\uff01\u4ee5\u4e0a\u5173\u4e8e\u300a\u5982\u4f55\u5728MySQL\u89e6\u53d1\u5668\u4e2d\u4f20\u9012\u53c2\u6570\u300b\u7684\u8be6\u7ec6\u4ecb\u7ecd\uff0c\u5927\u5bb6\u90fd\u638c\u63e1\u4e86\u5427\uff01\u5982\u679c\u60f3\u8981\u7ee7\u7eed\u63d0\u5347\u81ea\u5df1\u7684\u80fd\u529b\uff0c\u90a3\u4e48\u5c31\u6765\u5173\u6ce8\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\u5427\uff01<\/p>\n<dl>\n<dt>\n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"<p>\u5982\u4f55\u5728MySQL\u89e6\u53d1\u5668\u4e2d\u4f20\u9012\u53c2\u6570&#46;&#46;&#46;<\/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-200086","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200086","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=200086"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200086\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=200086"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=200086"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=200086"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}