{"id":80058,"date":"2024-10-16T13:51:16","date_gmt":"2024-10-16T05:51:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/80058\/"},"modified":"2024-10-16T13:51:16","modified_gmt":"2024-10-16T05:51:16","slug":"mysql%e6%8c%87%e4%bb%a4-trigger%ef%bc%88%e8%a7%b8%e7%99%bc%e5%99%a8%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/80058\/","title":{"rendered":"MySQL\u6307\u4ee4: TRIGGER\uff08\u89f8\u767c\u5668\uff09"},"content":{"rendered":"<h1 id=\"mysql%e6%8c%87%e4%bb%a4-trigger%ef%bc%88%e8%a7%b8%e7%99%bc%e5%99%a8%ef%bc%89-SdVZlIPMii\">MySQL\u6307\u4ee4: TRIGGER\uff08\u89f8\u767c\u5668\uff09<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u89f8\u767c\u5668\uff08Trigger\uff09\u662f\u4e00\u7a2e\u81ea\u52d5\u57f7\u884c\u7684\u7a0b\u5e8f\uff0c\u7576\u7279\u5b9a\u4e8b\u4ef6\u767c\u751f\u6642\uff0c\u5b83\u6703\u81ea\u52d5\u57f7\u884c\u9810\u5b9a\u7684\u64cd\u4f5c\u3002MySQL\u4f5c\u70ba\u4e00\u500b\u6d41\u884c\u7684\u958b\u6e90\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u5f37\u5927\u7684\u89f8\u767c\u5668\u529f\u80fd\uff0c\u5e6b\u52a9\u958b\u767c\u8005\u5728\u8cc7\u6599\u5eab\u5c64\u9762\u4e0a\u5be6\u73fe\u81ea\u52d5\u5316\u548c\u6578\u64da\u5b8c\u6574\u6027\u3002<\/p>\n<h2 id=\"%e8%a7%b8%e7%99%bc%e5%99%a8%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-SdVZlIPMii\">\u89f8\u767c\u5668\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u89f8\u767c\u5668\u662f\u4e00\u7a2e\u7279\u6b8a\u7684\u5b58\u5132\u7a0b\u5e8f\uff0c\u5b83\u8207\u8868\u683c\u7684\u67d0\u4e9b\u64cd\u4f5c\uff08\u5982INSERT\u3001UPDATE\u6216DELETE\uff09\u76f8\u95dc\u806f\u3002\u7576\u9019\u4e9b\u64cd\u4f5c\u88ab\u57f7\u884c\u6642\uff0c\u89f8\u767c\u5668\u6703\u81ea\u52d5\u88ab\u89f8\u767c\uff0c\u4e26\u57f7\u884c\u76f8\u61c9\u7684SQL\u8a9e\u53e5\u3002\u9019\u4f7f\u5f97\u89f8\u767c\u5668\u6210\u70ba\u5be6\u73fe\u6578\u64da\u9a57\u8b49\u3001\u65e5\u8a8c\u8a18\u9304\u548c\u81ea\u52d5\u66f4\u65b0\u7b49\u529f\u80fd\u7684\u7406\u60f3\u5de5\u5177\u3002<\/p>\n<h2 id=\"%e8%a7%b8%e7%99%bc%e5%99%a8%e7%9a%84%e9%a1%9e%e5%9e%8b-SdVZlIPMii\">\u89f8\u767c\u5668\u7684\u985e\u578b<\/h2>\n<p>\u5728MySQL\u4e2d\uff0c\u89f8\u767c\u5668\u4e3b\u8981\u6709\u4e09\u7a2e\u985e\u578b\uff1a<\/p>\n<ul>\n<li><strong>BEFORE\u89f8\u767c\u5668\uff1a<\/strong>\u5728\u57f7\u884cINSERT\u3001UPDATE\u6216DELETE\u64cd\u4f5c\u4e4b\u524d\u89f8\u767c\u3002<\/li>\n<li><strong>AFTER\u89f8\u767c\u5668\uff1a<\/strong>\u5728\u57f7\u884cINSERT\u3001UPDATE\u6216DELETE\u64cd\u4f5c\u4e4b\u5f8c\u89f8\u767c\u3002<\/li>\n<li><strong>INSTEAD OF\u89f8\u767c\u5668\uff1a<\/strong>\u4e3b\u8981\u7528\u65bc\u8996\u5716\uff0c\u7576\u5c0d\u8996\u5716\u57f7\u884cINSERT\u3001UPDATE\u6216DELETE\u64cd\u4f5c\u6642\uff0c\u89f8\u767c\u5668\u6703\u53d6\u4ee3\u9019\u4e9b\u64cd\u4f5c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%89%b5%e5%bb%ba%e8%a7%b8%e7%99%bc%e5%99%a8%e7%9a%84%e8%aa%9e%e6%b3%95-SdVZlIPMii\">\u5275\u5efa\u89f8\u767c\u5668\u7684\u8a9e\u6cd5<\/h2>\n<p>\u5275\u5efa\u89f8\u767c\u5668\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>CREATE TRIGGER trigger_name\n    trigger_time trigger_event\n    ON table_name\n    FOR EACH ROW\n    BEGIN\n        -- SQL\u8a9e\u53e5\n    END;<\/code><\/pre>\n<p>\u5176\u4e2d\uff0c<code>trigger_name<\/code>\u662f\u89f8\u767c\u5668\u7684\u540d\u7a31\uff0c<code>trigger_time<\/code>\u53ef\u4ee5\u662fBEFORE\u6216AFTER\uff0c<code>trigger_event<\/code>\u53ef\u4ee5\u662fINSERT\u3001UPDATE\u6216DELETE\uff0c<code>table_name<\/code>\u662f\u89f8\u767c\u5668\u6240\u95dc\u806f\u7684\u8868\u683c\u3002<\/p>\n<h2 id=\"%e7%af%84%e4%be%8b%ef%bc%9a%e5%89%b5%e5%bb%ba%e4%b8%80%e5%80%8b%e7%b0%a1%e5%96%ae%e7%9a%84%e8%a7%b8%e7%99%bc%e5%99%a8-SdVZlIPMii\">\u7bc4\u4f8b\uff1a\u5275\u5efa\u4e00\u500b\u7c21\u55ae\u7684\u89f8\u767c\u5668<\/h2>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba<code>employees<\/code>\u7684\u8868\u683c\uff0c\u7576\u6709\u65b0\u54e1\u5de5\u88ab\u6dfb\u52a0\u6642\uff0c\u6211\u5011\u5e0c\u671b\u81ea\u52d5\u5728<code>audit_log<\/code>\u8868\u683c\u4e2d\u8a18\u9304\u9019\u4e00\u64cd\u4f5c\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\u5275\u5efa\u4e00\u500bBEFORE INSERT\u89f8\u767c\u5668\uff1a<\/p>\n<pre><code>CREATE TRIGGER before_employee_insert\n    BEFORE INSERT\n    ON employees\n    FOR EACH ROW\n    BEGIN\n        INSERT INTO audit_log (action, employee_id, action_time)\n        VALUES ('INSERT', NEW.id, NOW());\n    END;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u7576\u6709\u65b0\u54e1\u5de5\u88ab\u63d2\u5165\u5230<code>employees<\/code>\u8868\u683c\u6642\uff0c\u89f8\u767c\u5668\u6703\u81ea\u52d5\u5728<code>audit_log<\/code>\u8868\u683c\u4e2d\u8a18\u9304\u9019\u4e00\u64cd\u4f5c\uff0c\u5305\u62ec\u54e1\u5de5ID\u548c\u7576\u524d\u6642\u9593\u3002<\/p>\n<h2 id=\"%e8%a7%b8%e7%99%bc%e5%99%a8%e7%9a%84%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-SdVZlIPMii\">\u89f8\u767c\u5668\u7684\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u96d6\u7136\u89f8\u767c\u5668\u5728\u81ea\u52d5\u5316\u548c\u6578\u64da\u5b8c\u6574\u6027\u65b9\u9762\u975e\u5e38\u6709\u7528\uff0c\u4f46\u5728\u4f7f\u7528\u6642\u4e5f\u9700\u8981\u6ce8\u610f\u4ee5\u4e0b\u5e7e\u9ede\uff1a<\/p>\n<ul>\n<li>\u89f8\u767c\u5668\u7684\u57f7\u884c\u53ef\u80fd\u6703\u5f71\u97ff\u6027\u80fd\uff0c\u7279\u5225\u662f\u5728\u9ad8\u983b\u7387\u7684\u6578\u64da\u64cd\u4f5c\u4e2d\u3002<\/li>\n<li>\u904e\u591a\u7684\u89f8\u767c\u5668\u53ef\u80fd\u6703\u4f7f\u5f97\u6578\u64da\u6d41\u8b8a\u5f97\u8907\u96dc\uff0c\u589e\u52a0\u7dad\u8b77\u96e3\u5ea6\u3002<\/li>\n<li>\u89f8\u767c\u5668\u4e2d\u7684\u932f\u8aa4\u53ef\u80fd\u6703\u5c0e\u81f4\u6574\u500b\u64cd\u4f5c\u5931\u6557\uff0c\u56e0\u6b64\u9700\u8981\u8b39\u614e\u8a2d\u8a08\u548c\u6e2c\u8a66\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-SdVZlIPMii\">\u7e3d\u7d50<\/h2>\n<p>MySQL\u7684\u89f8\u767c\u5668\u529f\u80fd\u70ba\u958b\u767c\u8005\u63d0\u4f9b\u4e86\u4e00\u7a2e\u5f37\u5927\u7684\u5de5\u5177\u4f86\u81ea\u52d5\u5316\u6578\u64da\u64cd\u4f5c\u548c\u7dad\u8b77\u6578\u64da\u5b8c\u6574\u6027\u3002\u901a\u904e\u5408\u7406\u4f7f\u7528\u89f8\u767c\u5668\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u63d0\u9ad8\u8cc7\u6599\u5eab\u7684\u6548\u7387\u548c\u53ef\u9760\u6027\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u7ba1\u7406\u6578\u64da\u7684\u4f01\u696d\u4f86\u8aaa\uff0c\u9078\u64c7\u5408\u9069\u7684<code><a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a><\/code>\u6216<code><a href=\"https:\/\/server.hk\">\u96f2\u4f3a\u670d\u5668<\/a><\/code>\u89e3\u6c7a\u65b9\u6848\uff0c\u53ef\u4ee5\u9032\u4e00\u6b65\u63d0\u5347\u8cc7\u6599\u5eab\u7684\u6027\u80fd\u548c\u7a69\u5b9a\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u4e2d\u7684TRIGGER\uff08\u89f8\u767c\u5668\uff09\u6307\u4ee4\uff0c\u5982\u4f55\u81ea\u52d5\u57f7\u884c\u64cd\u4f5c\u4ee5\u97ff\u61c9\u6578\u64da\u5eab\u4e8b\u4ef6\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u6548\u7387\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-80058","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/80058","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=80058"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/80058\/revisions"}],"predecessor-version":[{"id":80059,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/80058\/revisions\/80059"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=80058"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=80058"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=80058"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}