{"id":160761,"date":"2024-11-04T00:47:25","date_gmt":"2024-11-03T16:47:25","guid":{"rendered":"https:\/\/server.hk\/cnblog\/160761\/"},"modified":"2024-11-04T00:47:26","modified_gmt":"2024-11-03T16:47:26","slug":"%e8%b3%87%e6%96%99%e5%ba%ab%e6%95%99%e7%a8%8b%ef%bc%9amysql%e5%89%b5%e5%bb%ba%e8%a7%b8%e7%99%bc%e5%99%a8%ef%bc%88create-trigger%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/160761\/","title":{"rendered":"\u8cc7\u6599\u5eab\u6559\u7a0b\uff1aMySQL\u5275\u5efa\u89f8\u767c\u5668\uff08CREATE TRIGGER\uff09"},"content":{"rendered":"<h1 id=\"%e8%b3%87%e6%96%99%e5%ba%ab%e6%95%99%e7%a8%8b%ef%bc%9amysql%e5%89%b5%e5%bb%ba%e8%a7%b8%e7%99%bc%e5%99%a8%ef%bc%88create-trigger%ef%bc%89-jkHkqkSrXM\">\u8cc7\u6599\u5eab\u6559\u7a0b\uff1aMySQL\u5275\u5efa\u89f8\u767c\u5668\uff08CREATE TRIGGER\uff09<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u89f8\u767c\u5668\uff08Trigger\uff09\u662f\u4e00\u7a2e\u7279\u6b8a\u7684\u5b58\u5132\u7a0b\u5e8f\uff0c\u5b83\u6703\u5728\u7279\u5b9a\u4e8b\u4ef6\u767c\u751f\u6642\u81ea\u52d5\u57f7\u884c\u3002MySQL\u4f5c\u70ba\u4e00\u500b\u6d41\u884c\u7684\u958b\u6e90\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u5275\u5efa\u89f8\u767c\u5668\u7684\u529f\u80fd\uff0c\u8b93\u958b\u767c\u8005\u80fd\u5920\u5728\u8cc7\u6599\u8868\u7684\u63d2\u5165\u3001\u66f4\u65b0\u6216\u522a\u9664\u64cd\u4f5c\u6642\uff0c\u81ea\u52d5\u57f7\u884c\u4e00\u4e9b\u7279\u5b9a\u7684\u64cd\u4f5c\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5982\u4f55\u5728MySQL\u4e2d\u5275\u5efa\u89f8\u767c\u5668\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u7bc4\u4f8b\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-jkHkqkSrXM\">\u89f8\u767c\u5668\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u89f8\u767c\u5668\u662f\u4e00\u7a2e\u8207\u8cc7\u6599\u8868\u95dc\u806f\u7684\u7a0b\u5e8f\uff0c\u5b83\u5728\u8cc7\u6599\u8868\u7684\u67d0\u4e9b\u64cd\u4f5c\uff08\u5982INSERT\u3001UPDATE\u6216DELETE\uff09\u767c\u751f\u6642\u81ea\u52d5\u57f7\u884c\u3002\u89f8\u767c\u5668\u7684\u4e3b\u8981\u7528\u9014\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u81ea\u52d5\u8a18\u9304\u8b8a\u66f4\u6b77\u53f2<\/li>\n<li>\u5f37\u5236\u57f7\u884c\u696d\u52d9\u898f\u5247<\/li>\n<li>\u7dad\u8b77\u8cc7\u6599\u5b8c\u6574\u6027<\/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-jkHkqkSrXM\">\u5275\u5efa\u89f8\u767c\u5668\u7684\u8a9e\u6cd5<\/h2>\n<p>\u5728MySQL\u4e2d\uff0c\u5275\u5efa\u89f8\u767c\u5668\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>CREATE TRIGGER \u89f8\u767c\u5668\u540d\u7a31\n    {BEFORE | AFTER} {INSERT | UPDATE | DELETE}\n    ON \u8868\u540d\u7a31\n    FOR EACH ROW\n    BEGIN\n        -- \u89f8\u767c\u5668\u908f\u8f2f\n    END;<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c<strong>\u89f8\u767c\u5668\u540d\u7a31<\/strong>\u662f\u60a8\u70ba\u89f8\u767c\u5668\u6307\u5b9a\u7684\u540d\u7a31\uff0c<strong>BEFORE<\/strong>\u6216<strong>AFTER<\/strong>\u6307\u5b9a\u89f8\u767c\u5668\u5728\u64cd\u4f5c\u4e4b\u524d\u6216\u4e4b\u5f8c\u57f7\u884c\uff0c<strong>INSERT<\/strong>\u3001<strong>UPDATE<\/strong>\u6216<strong>DELETE<\/strong>\u6307\u5b9a\u89f8\u767c\u5668\u7684\u89f8\u767c\u4e8b\u4ef6\uff0c<strong>\u8868\u540d\u7a31<\/strong>\u662f\u89f8\u767c\u5668\u6240\u95dc\u806f\u7684\u8cc7\u6599\u8868\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-jkHkqkSrXM\">\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\u8cc7\u6599\u8868\uff0c\u8a72\u8868\u5305\u542b\u54e1\u5de5\u7684\u57fa\u672c\u8cc7\u8a0a\u3002\u6211\u5011\u5e0c\u671b\u5728\u6bcf\u6b21\u63d2\u5165\u65b0\u54e1\u5de5\u6642\uff0c\u81ea\u52d5\u8a18\u9304\u63d2\u5165\u7684\u6642\u9593\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\u5275\u5efa\u89f8\u767c\u5668\uff1a<\/p>\n<pre><code>CREATE TRIGGER before_insert_employees\n    BEFORE INSERT\n    ON employees\n    FOR EACH ROW\n    BEGIN\n        SET NEW.created_at = NOW();\n    END;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u7bc4\u4f8b\u4e2d\uff0c\u7576\u6709\u65b0\u54e1\u5de5\u63d2\u5165\u5230 <code>employees<\/code> \u8868\u6642\uff0c\u89f8\u767c\u5668\u6703\u81ea\u52d5\u5c07\u7576\u524d\u6642\u9593\u8a2d\u7f6e\u5230 <code>created_at<\/code> \u6b04\u4f4d\u3002<\/p>\n<h2 id=\"%e7%af%84%e4%be%8b%ef%bc%9a%e6%9b%b4%e6%96%b0%e8%a7%b8%e7%99%bc%e5%99%a8-jkHkqkSrXM\">\u7bc4\u4f8b\uff1a\u66f4\u65b0\u89f8\u767c\u5668<\/h2>\n<p>\u9664\u4e86\u63d2\u5165\u64cd\u4f5c\uff0c\u6211\u5011\u9084\u53ef\u4ee5\u5275\u5efa\u4e00\u500b\u5728\u66f4\u65b0\u64cd\u4f5c\u6642\u89f8\u767c\u7684\u89f8\u767c\u5668\u3002\u4f8b\u5982\uff0c\u7576\u54e1\u5de5\u7684\u85aa\u6c34\u88ab\u66f4\u65b0\u6642\uff0c\u6211\u5011\u5e0c\u671b\u8a18\u9304\u4e0b\u66f4\u65b0\u7684\u6642\u9593\uff1a<\/p>\n<pre><code>CREATE TRIGGER after_update_employees\n    AFTER UPDATE\n    ON employees\n    FOR EACH ROW\n    BEGIN\n        SET NEW.updated_at = NOW();\n    END;<\/code><\/pre>\n<p>\u9019\u500b\u89f8\u767c\u5668\u6703\u5728\u6bcf\u6b21\u66f4\u65b0 <code>employees<\/code> \u8868\u4e2d\u7684\u8cc7\u6599\u6642\uff0c\u81ea\u52d5\u66f4\u65b0 <code>updated_at<\/code> \u6b04\u4f4d\u70ba\u7576\u524d\u6642\u9593\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-jkHkqkSrXM\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528\u89f8\u767c\u5668\u6642\uff0c\u6709\u5e7e\u9ede\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li>\u89f8\u767c\u5668\u7684\u57f7\u884c\u53ef\u80fd\u6703\u5f71\u97ff\u6027\u80fd\uff0c\u7279\u5225\u662f\u5728\u5927\u91cf\u8cc7\u6599\u64cd\u4f5c\u6642\u3002<\/li>\n<li>\u89f8\u767c\u5668\u5167\u90e8\u7684\u908f\u8f2f\u61c9\u8a72\u7c21\u55ae\u660e\u77ad\uff0c\u4ee5\u907f\u514d\u8907\u96dc\u7684\u908f\u8f2f\u5c0e\u81f4\u96e3\u4ee5\u7dad\u8b77\u3002<\/li>\n<li>\u5728\u8a2d\u8a08\u8cc7\u6599\u5eab\u6642\uff0c\u61c9\u8b39\u614e\u8003\u616e\u89f8\u767c\u5668\u7684\u4f7f\u7528\uff0c\u78ba\u4fdd\u5176\u7b26\u5408\u696d\u52d9\u9700\u6c42\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-jkHkqkSrXM\">\u7e3d\u7d50<\/h2>\n<p>MySQL\u7684\u89f8\u767c\u5668\u529f\u80fd\u70ba\u8cc7\u6599\u5eab\u7ba1\u7406\u63d0\u4f9b\u4e86\u5f37\u5927\u7684\u81ea\u52d5\u5316\u652f\u6301\uff0c\u80fd\u5920\u5728\u8cc7\u6599\u8b8a\u66f4\u6642\u81ea\u52d5\u57f7\u884c\u7279\u5b9a\u64cd\u4f5c\u3002\u900f\u904e\u672c\u6587\u7684\u4ecb\u7d39\uff0c\u60a8\u61c9\u8a72\u80fd\u5920\u7406\u89e3\u5982\u4f55\u5275\u5efa\u548c\u4f7f\u7528\u89f8\u767c\u5668\u4f86\u589e\u5f37\u8cc7\u6599\u5eab\u7684\u529f\u80fd\u3002\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u904b\u884c\u60a8\u7684MySQL\u8cc7\u6599\u5eab\uff0cServer.HK\u63d0\u4f9b\u4e86\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u7684\u5ba2\u6236\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u5728MySQL\u4e2d\u5275\u5efa\u89f8\u767c\u5668\uff08CREATE TRIGGER\uff09\uff0c\u4ee5\u81ea\u52d5\u5316\u6578\u64da\u5eab\u64cd\u4f5c\u548c\u589e\u5f37\u6578\u64da\u5b8c\u6574\u6027\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-160761","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160761","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=160761"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160761\/revisions"}],"predecessor-version":[{"id":160762,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160761\/revisions\/160762"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=160761"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=160761"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=160761"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}