{"id":160807,"date":"2024-11-04T01:10:23","date_gmt":"2024-11-03T17:10:23","guid":{"rendered":"https:\/\/server.hk\/cnblog\/160807\/"},"modified":"2024-11-04T01:10:23","modified_gmt":"2024-11-03T17:10:23","slug":"%e8%b3%87%e6%96%99%e5%ba%ab%e6%95%99%e7%a8%8b%ef%bc%9amysql-%e4%bf%ae%e6%94%b9%e5%92%8c%e5%88%aa%e9%99%a4%e8%a7%b8%e7%99%bc%e5%99%a8%ef%bc%88drop-trigger%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/160807\/","title":{"rendered":"\u8cc7\u6599\u5eab\u6559\u7a0b\uff1aMySQL \u4fee\u6539\u548c\u522a\u9664\u89f8\u767c\u5668\uff08DROP TRIGGER\uff09"},"content":{"rendered":"<h1 id=\"%e8%b3%87%e6%96%99%e5%ba%ab%e6%95%99%e7%a8%8b%ef%bc%9amysql-%e4%bf%ae%e6%94%b9%e5%92%8c%e5%88%aa%e9%99%a4%e8%a7%b8%e7%99%bc%e5%99%a8%ef%bc%88drop-trigger%ef%bc%89-FLvfnmyyRZ\">\u8cc7\u6599\u5eab\u6559\u7a0b\uff1aMySQL \u4fee\u6539\u548c\u522a\u9664\u89f8\u767c\u5668\uff08DROP TRIGGER\uff09<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u4e2d\uff0c\u89f8\u767c\u5668\u662f\u4e00\u7a2e\u975e\u5e38\u6709\u7528\u7684\u5de5\u5177\uff0c\u5b83\u53ef\u4ee5\u81ea\u52d5\u57f7\u884c\u7279\u5b9a\u7684\u64cd\u4f5c\uff0c\u7576\u67d0\u4e9b\u4e8b\u4ef6\u767c\u751f\u6642\uff0c\u4f8b\u5982\u63d2\u5165\u3001\u66f4\u65b0\u6216\u522a\u9664\u8cc7\u6599\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\u3002\u7136\u800c\uff0c\u96a8\u8457\u696d\u52d9\u9700\u6c42\u7684\u8b8a\u5316\uff0c\u60a8\u53ef\u80fd\u9700\u8981\u4fee\u6539\u6216\u522a\u9664\u73fe\u6709\u7684\u89f8\u767c\u5668\u3002\u672c\u6587\u5c07\u8a73\u7d30\u4ecb\u7d39\u5982\u4f55\u5728 MySQL \u4e2d\u4fee\u6539\u548c\u522a\u9664\u89f8\u767c\u5668\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e8%a7%b8%e7%99%bc%e5%99%a8%ef%bc%9f-FLvfnmyyRZ\">\u4ec0\u9ebc\u662f\u89f8\u767c\u5668\uff1f<\/h2>\n<p>\u89f8\u767c\u5668\u662f\u4e00\u7a2e\u7279\u6b8a\u7684\u5132\u5b58\u7a0b\u5e8f\uff0c\u5b83\u5728\u7279\u5b9a\u4e8b\u4ef6\u767c\u751f\u6642\u81ea\u52d5\u57f7\u884c\u3002\u9019\u4e9b\u4e8b\u4ef6\u901a\u5e38\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>INSERT\uff1a\u7576\u6709\u65b0\u8cc7\u6599\u63d2\u5165\u6642\u3002<\/li>\n<li>UPDATE\uff1a\u7576\u73fe\u6709\u8cc7\u6599\u88ab\u66f4\u65b0\u6642\u3002<\/li>\n<li>DELETE\uff1a\u7576\u8cc7\u6599\u88ab\u522a\u9664\u6642\u3002<\/li>\n<\/ul>\n<p>\u89f8\u767c\u5668\u53ef\u4ee5\u7528\u4f86\u57f7\u884c\u591a\u7a2e\u64cd\u4f5c\uff0c\u4f8b\u5982\u8a18\u9304\u8b8a\u66f4\u3001\u9a57\u8b49\u8cc7\u6599\u6216\u81ea\u52d5\u66f4\u65b0\u5176\u4ed6\u8868\u683c\u7684\u8cc7\u6599\u3002<\/p>\n<h2 id=\"%e5%a6%82%e4%bd%95%e5%89%b5%e5%bb%ba%e8%a7%b8%e7%99%bc%e5%99%a8-FLvfnmyyRZ\">\u5982\u4f55\u5275\u5efa\u89f8\u767c\u5668<\/h2>\n<p>\u5728\u4e86\u89e3\u5982\u4f55\u4fee\u6539\u548c\u522a\u9664\u89f8\u767c\u5668\u4e4b\u524d\uff0c\u9996\u5148\u9700\u8981\u77e5\u9053\u5982\u4f55\u5275\u5efa\u89f8\u767c\u5668\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>CREATE TRIGGER before_insert_example\nBEFORE INSERT ON example_table\nFOR EACH ROW\nBEGIN\n    SET NEW.created_at = NOW();\nEND;<\/code><\/pre>\n<p>\u9019\u500b\u89f8\u767c\u5668\u6703\u5728\u6bcf\u6b21\u5411 `example_table` \u8868\u63d2\u5165\u65b0\u8cc7\u6599\u4e4b\u524d\uff0c\u81ea\u52d5\u8a2d\u7f6e `created_at` \u6b04\u4f4d\u70ba\u7576\u524d\u6642\u9593\u3002<\/p>\n<h2 id=\"%e4%bf%ae%e6%94%b9%e8%a7%b8%e7%99%bc%e5%99%a8-FLvfnmyyRZ\">\u4fee\u6539\u89f8\u767c\u5668<\/h2>\n<p>MySQL \u4e26\u4e0d\u76f4\u63a5\u652f\u6301\u4fee\u6539\u5df2\u5b58\u5728\u7684\u89f8\u767c\u5668\u3002\u5982\u679c\u60a8\u9700\u8981\u4fee\u6539\u89f8\u767c\u5668\uff0c\u60a8\u5fc5\u9808\u5148\u522a\u9664\u5b83\uff0c\u7136\u5f8c\u91cd\u65b0\u5275\u5efa\u4e00\u500b\u65b0\u7684\u89f8\u767c\u5668\u3002\u4ee5\u4e0b\u662f\u522a\u9664\u89f8\u767c\u5668\u7684\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>DROP TRIGGER [IF EXISTS] trigger_name;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5982\u679c\u60a8\u60f3\u522a\u9664\u540d\u70ba `before_insert_example` \u7684\u89f8\u767c\u5668\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\uff1a<\/p>\n<pre><code>DROP TRIGGER IF EXISTS before_insert_example;<\/code><\/pre>\n<p>\u522a\u9664\u89f8\u767c\u5668\u5f8c\uff0c\u60a8\u53ef\u4ee5\u5275\u5efa\u4e00\u500b\u65b0\u7684\u89f8\u767c\u5668\u4f86\u66ff\u4ee3\u5b83\uff0c\u4e26\u6839\u64da\u9700\u8981\u9032\u884c\u4fee\u6539\u3002<\/p>\n<h2 id=\"%e5%88%aa%e9%99%a4%e8%a7%b8%e7%99%bc%e5%99%a8-FLvfnmyyRZ\">\u522a\u9664\u89f8\u767c\u5668<\/h2>\n<p>\u5982\u4e0a\u6240\u8ff0\uff0c\u522a\u9664\u89f8\u767c\u5668\u7684\u8a9e\u6cd5\u70ba\uff1a<\/p>\n<pre><code>DROP TRIGGER [IF EXISTS] trigger_name;<\/code><\/pre>\n<p>\u9019\u88e1\u7684 `IF EXISTS` \u662f\u53ef\u9078\u7684\uff0c\u5b83\u53ef\u4ee5\u9632\u6b62\u5728\u89f8\u767c\u5668\u4e0d\u5b58\u5728\u6642\u5f15\u767c\u932f\u8aa4\u3002\u9019\u5c0d\u65bc\u7dad\u8b77\u8cc7\u6599\u5eab\u7684\u7a69\u5b9a\u6027\u975e\u5e38\u6709\u5e6b\u52a9\u3002<\/p>\n<h3 id=\"%e5%88%aa%e9%99%a4%e8%a7%b8%e7%99%bc%e5%99%a8%e7%9a%84%e7%af%84%e4%be%8b-FLvfnmyyRZ\">\u522a\u9664\u89f8\u767c\u5668\u7684\u7bc4\u4f8b<\/h3>\n<p>\u5047\u8a2d\u60a8\u6709\u4e00\u500b\u540d\u70ba `after_delete_example` \u7684\u89f8\u767c\u5668\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\u5c07\u5176\u522a\u9664\uff1a<\/p>\n<pre><code>DROP TRIGGER IF EXISTS after_delete_example;<\/code><\/pre>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-FLvfnmyyRZ\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u522a\u9664\u6216\u4fee\u6539\u89f8\u767c\u5668\u6642\uff0c\u8acb\u6ce8\u610f\u4ee5\u4e0b\u5e7e\u9ede\uff1a<\/p>\n<ul>\n<li>\u78ba\u4fdd\u60a8\u6709\u8db3\u5920\u7684\u6b0a\u9650\u4f86\u522a\u9664\u6216\u5275\u5efa\u89f8\u767c\u5668\u3002<\/li>\n<li>\u5728\u522a\u9664\u89f8\u767c\u5668\u4e4b\u524d\uff0c\u6700\u597d\u5148\u5099\u4efd\u8cc7\u6599\u5eab\uff0c\u4ee5\u9632\u6b62\u610f\u5916\u640d\u5931\u3002<\/li>\n<li>\u5728\u91cd\u65b0\u5275\u5efa\u89f8\u767c\u5668\u6642\uff0c\u8acb\u4ed4\u7d30\u6aa2\u67e5\u89f8\u767c\u5668\u7684\u908f\u8f2f\uff0c\u4ee5\u78ba\u4fdd\u5176\u7b26\u5408\u696d\u52d9\u9700\u6c42\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-FLvfnmyyRZ\">\u7e3d\u7d50<\/h2>\n<p>\u89f8\u767c\u5668\u5728 MySQL \u4e2d\u662f\u4e00\u500b\u5f37\u5927\u7684\u529f\u80fd\uff0c\u53ef\u4ee5\u81ea\u52d5\u5316\u8a31\u591a\u8cc7\u6599\u5eab\u64cd\u4f5c\u3002\u96d6\u7136 MySQL \u4e0d\u652f\u6301\u76f4\u63a5\u4fee\u6539\u89f8\u767c\u5668\uff0c\u4f46\u901a\u904e\u522a\u9664\u548c\u91cd\u65b0\u5275\u5efa\u7684\u65b9\u5f0f\uff0c\u60a8\u53ef\u4ee5\u9748\u6d3b\u5730\u8abf\u6574\u89f8\u767c\u5668\u7684\u884c\u70ba\u3002\u5728\u9032\u884c\u9019\u4e9b\u64cd\u4f5c\u6642\uff0c\u8acb\u52d9\u5fc5\u5c0f\u5fc3\uff0c\u4ee5\u78ba\u4fdd\u8cc7\u6599\u7684\u5b8c\u6574\u6027\u548c\u7cfb\u7d71\u7684\u7a69\u5b9a\u6027\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u9069\u5408\u5404\u7a2e\u9700\u6c42\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u9084\u662f <a href=\"https:\/\/server.hk\">\u4e91\u4f3a\u670d\u5668<\/a>\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u670d\u52d9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u5728MySQL\u4e2d\u4fee\u6539\u548c\u522a\u9664\u89f8\u767c\u5668\uff08DROP TRIGGER\uff09\uff0c\u638c\u63e1\u8cc7\u6599\u5eab\u7ba1\u7406\u7684\u95dc\u9375\u6280\u5de7\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-160807","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160807","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=160807"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160807\/revisions"}],"predecessor-version":[{"id":160808,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160807\/revisions\/160808"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=160807"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=160807"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=160807"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}