{"id":75844,"date":"2024-10-16T01:42:25","date_gmt":"2024-10-15T17:42:25","guid":{"rendered":"https:\/\/server.hk\/cnblog\/75844\/"},"modified":"2024-10-16T01:42:25","modified_gmt":"2024-10-15T17:42:25","slug":"mysql-%e8%a7%b8%e7%99%bc%e5%99%a8%e7%9a%84%e4%b8%89%e5%80%8b%e7%a4%ba%e4%be%8b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/75844\/","title":{"rendered":"MySQL \u89f8\u767c\u5668\u7684\u4e09\u500b\u793a\u4f8b"},"content":{"rendered":"<h1 id=\"mysql-%e8%a7%b8%e7%99%bc%e5%99%a8%e7%9a%84%e4%b8%89%e5%80%8b%e7%a4%ba%e4%be%8b-YAyKIHeAcd\">MySQL \u89f8\u767c\u5668\u7684\u4e09\u500b\u793a\u4f8b<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u89f8\u767c\u5668\uff08Trigger\uff09\u662f\u4e00\u7a2e\u7279\u6b8a\u7684\u5132\u5b58\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\u5f37\u5927\u7684\u89f8\u767c\u5668\u529f\u80fd\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u81ea\u52d5\u5316\u67d0\u4e9b\u64cd\u4f5c\uff0c\u589e\u5f37\u8cc7\u6599\u7684\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u4e09\u500b MySQL \u89f8\u767c\u5668\u7684\u5be6\u969b\u793a\u4f8b\uff0c\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u5176\u61c9\u7528\u5834\u666f\u3002<\/p>\n<h2 id=\"%e7%a4%ba%e4%be%8b%e4%b8%80%ef%bc%9a%e8%87%aa%e5%8b%95%e6%9b%b4%e6%96%b0%e6%99%82%e9%96%93%e6%88%b3-YAyKIHeAcd\">\u793a\u4f8b\u4e00\uff1a\u81ea\u52d5\u66f4\u65b0\u6642\u9593\u6233<\/h2>\n<p>\u5728\u8a31\u591a\u61c9\u7528\u4e2d\uff0c\u8a18\u9304\u8cc7\u6599\u7684\u6700\u5f8c\u66f4\u65b0\u6642\u9593\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u900f\u904e\u89f8\u767c\u5668\uff0c\u6211\u5011\u53ef\u4ee5\u81ea\u52d5\u66f4\u65b0\u67d0\u500b\u6b04\u4f4d\u7684\u6642\u9593\u6233\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>CREATE TABLE articles (\n    id INT AUTO_INCREMENT PRIMARY KEY,\n    title VARCHAR(255) NOT NULL,\n    content TEXT,\n    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP\n);\n\nCREATE TRIGGER before_update_articles\nBEFORE UPDATE ON articles\nFOR EACH ROW\nSET NEW.updated_at = CURRENT_TIMESTAMP;\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u5275\u5efa\u4e86\u4e00\u500b\u540d\u70ba `before_update_articles` \u7684\u89f8\u767c\u5668\uff0c\u7576 `articles` \u8868\u4e2d\u7684\u8cc7\u6599\u88ab\u66f4\u65b0\u6642\uff0c`updated_at` \u6b04\u4f4d\u6703\u81ea\u52d5\u8a2d\u7f6e\u70ba\u7576\u524d\u6642\u9593\u3002\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u6bcf\u6b21\u66f4\u65b0\u6642\u90fd\u80fd\u8a18\u9304\u6700\u65b0\u7684\u6642\u9593\u6233\u3002<\/p>\n<h2 id=\"%e7%a4%ba%e4%be%8b%e4%ba%8c%ef%bc%9a%e8%87%aa%e5%8b%95%e8%a8%98%e9%8c%84%e5%88%aa%e9%99%a4%e6%93%8d%e4%bd%9c-YAyKIHeAcd\">\u793a\u4f8b\u4e8c\uff1a\u81ea\u52d5\u8a18\u9304\u522a\u9664\u64cd\u4f5c<\/h2>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u6211\u5011\u53ef\u80fd\u9700\u8981\u8a18\u9304\u522a\u9664\u64cd\u4f5c\uff0c\u4ee5\u4fbf\u65e5\u5f8c\u67e5\u8a62\u6216\u5be9\u8a08\u3002\u53ef\u4ee5\u901a\u904e\u89f8\u767c\u5668\u5c07\u522a\u9664\u7684\u8cc7\u6599\u5b58\u5132\u5230\u53e6\u4e00\u500b\u8868\u4e2d\u3002\u4ee5\u4e0b\u662f\u5be6\u73fe\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>CREATE TABLE deleted_articles (\n    id INT,\n    title VARCHAR(255),\n    content TEXT,\n    deleted_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP\n);\n\nCREATE TRIGGER after_delete_articles\nAFTER DELETE ON articles\nFOR EACH ROW\nINSERT INTO deleted_articles (id, title, content)\nVALUES (OLD.id, OLD.title, OLD.content);\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c\u7576 `articles` \u8868\u4e2d\u7684\u4e00\u689d\u8a18\u9304\u88ab\u522a\u9664\u6642\uff0c`after_delete_articles` \u89f8\u767c\u5668\u6703\u5c07\u88ab\u522a\u9664\u7684\u8cc7\u6599\u63d2\u5165\u5230 `deleted_articles` \u8868\u4e2d\u3002\u9019\u6a23\uff0c\u6211\u5011\u5c31\u80fd\u5920\u4fdd\u7559\u522a\u9664\u7684\u8cc7\u6599\uff0c\u65b9\u4fbf\u65e5\u5f8c\u67e5\u8a62\u3002<\/p>\n<h2 id=\"%e7%a4%ba%e4%be%8b%e4%b8%89%ef%bc%9a%e8%87%aa%e5%8b%95%e8%a8%88%e7%ae%97%e7%b8%bd%e6%95%b8-YAyKIHeAcd\">\u793a\u4f8b\u4e09\uff1a\u81ea\u52d5\u8a08\u7b97\u7e3d\u6578<\/h2>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u6211\u5011\u53ef\u80fd\u9700\u8981\u5728\u63d2\u5165\u6216\u66f4\u65b0\u8cc7\u6599\u6642\u81ea\u52d5\u8a08\u7b97\u67d0\u500b\u6b04\u4f4d\u7684\u7e3d\u6578\u3002\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b `orders` \u8868\uff0c\u4e26\u5e0c\u671b\u5728\u6bcf\u6b21\u63d2\u5165\u65b0\u8a02\u55ae\u6642\u81ea\u52d5\u66f4\u65b0 `total_orders` \u6b04\u4f4d\u3002\u4ee5\u4e0b\u662f\u5be6\u73fe\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>CREATE TABLE orders (\n    id INT AUTO_INCREMENT PRIMARY KEY,\n    product_id INT,\n    quantity INT\n);\n\nCREATE TABLE order_summary (\n    total_orders INT DEFAULT 0\n);\n\nCREATE TRIGGER after_insert_orders\nAFTER INSERT ON orders\nFOR EACH ROW\nUPDATE order_summary SET total_orders = total_orders + NEW.quantity;\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c\u7576\u65b0\u7684\u8a02\u55ae\u88ab\u63d2\u5165\u5230 `orders` \u8868\u4e2d\u6642\uff0c`after_insert_orders` \u89f8\u767c\u5668\u6703\u81ea\u52d5\u66f4\u65b0 `order_summary` \u8868\u4e2d\u7684 `total_orders` \u6b04\u4f4d\uff0c\u5c07\u65b0\u8a02\u55ae\u7684\u6578\u91cf\u52a0\u5230\u7e3d\u6578\u4e2d\u3002\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u6211\u5011\u96a8\u6642\u64c1\u6709\u6700\u65b0\u7684\u8a02\u55ae\u7e3d\u6578\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-YAyKIHeAcd\">\u7e3d\u7d50<\/h2>\n<p>MySQL \u89f8\u767c\u5668\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u81ea\u52d5\u5316\u8cc7\u6599\u5eab\u64cd\u4f5c\uff0c\u589e\u5f37\u8cc7\u6599\u7684\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u3002\u900f\u904e\u4e0a\u8ff0\u4e09\u500b\u793a\u4f8b\uff0c\u6211\u5011\u53ef\u4ee5\u770b\u5230\u89f8\u767c\u5668\u5728\u81ea\u52d5\u66f4\u65b0\u6642\u9593\u6233\u3001\u8a18\u9304\u522a\u9664\u64cd\u4f5c\u548c\u8a08\u7b97\u7e3d\u6578\u7b49\u65b9\u9762\u7684\u61c9\u7528\u3002\u9019\u4e9b\u529f\u80fd\u4e0d\u50c5\u63d0\u9ad8\u4e86\u8cc7\u6599\u5eab\u7684\u6548\u7387\uff0c\u9084\u80fd\u6e1b\u5c11\u4eba\u70ba\u932f\u8aa4\u7684\u53ef\u80fd\u6027\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u8cc7\u6599\u5eab\u7ba1\u7406\u6709\u9032\u4e00\u6b65\u7684\u9700\u6c42\uff0c\u8003\u616e\u4f7f\u7528 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u4f86\u642d\u5efa\u60a8\u7684\u8cc7\u6599\u5eab\u74b0\u5883\uff0c\u4eab\u53d7\u66f4\u9ad8\u7684\u6027\u80fd\u548c\u7a69\u5b9a\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22 MySQL \u89f8\u767c\u5668\u7684\u4e09\u500b\u5be6\u7528\u793a\u4f8b\uff0c\u4e86\u89e3\u5982\u4f55\u81ea\u52d5\u5316\u6578\u64da\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-75844","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/75844","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=75844"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/75844\/revisions"}],"predecessor-version":[{"id":75845,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/75844\/revisions\/75845"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=75844"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=75844"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=75844"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}