{"id":3704,"date":"2025-05-18T22:40:17","date_gmt":"2025-05-18T14:40:17","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=3704"},"modified":"2025-05-18T22:46:52","modified_gmt":"2025-05-18T14:46:52","slug":"%e5%9c%a8-mysql-%e4%b8%ad%e5%a4%a7%e9%87%8f%e4%bd%bf%e7%94%a8%e8%a7%a6%e5%8f%91%e5%99%a8%ef%bc%88trigger%ef%bc%89%e6%9c%89%e5%93%aa%e4%ba%9b%e5%bd%b1%e5%93%8d%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/05\/18\/%e5%9c%a8-mysql-%e4%b8%ad%e5%a4%a7%e9%87%8f%e4%bd%bf%e7%94%a8%e8%a7%a6%e5%8f%91%e5%99%a8%ef%bc%88trigger%ef%bc%89%e6%9c%89%e5%93%aa%e4%ba%9b%e5%bd%b1%e5%93%8d%ef%bc%9f\/","title":{"rendered":"\u5728 MySQL \u4e2d\u5927\u91cf\u4f7f\u7528\u89e6\u53d1\u5668\uff08Trigger\uff09\u6709\u54ea\u4e9b\u5f71\u54cd\uff1f"},"content":{"rendered":"\n<p>\u5728 MySQL \u4e2d\u9891\u7e41\u4f7f\u7528\u89e6\u53d1\u5668\u786e\u5b9e\u53ef\u80fd\u5bf9\u6027\u80fd\u9020\u6210\u5f71\u54cd\uff0c\u4e3b\u8981\u539f\u56e0\u5728\u4e8e\u5b83\u4eec\u589e\u52a0\u4e86\u989d\u5916\u7684\u8ba1\u7b97\u548c I\/O \u5f00\u9500\uff0c\u540c\u65f6\u53ef\u80fd\u5e26\u6765\u5e76\u53d1\u6027\u95ee\u9898\u3002\u4ee5\u4e0b\u662f\u8be6\u7ec6\u7684\u6027\u80fd\u5f71\u54cd\u5206\u6790\u53ca\u4f18\u5316\u7b56\u7565\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>1. \u89e6\u53d1\u5668\u7684\u6027\u80fd\u5f71\u54cd<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u989d\u5916\u8ba1\u7b97\u5f00\u9500<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u6bcf\u6b21\u89e6\u53d1\u5668\u88ab\u6fc0\u6d3b\uff0cMySQL \u90fd\u9700\u8981\u989d\u5916\u8ba1\u7b97\u89e6\u53d1\u903b\u8f91\u3002<\/li>\n\n\n\n<li>\u89e6\u53d1\u5668\u7684 <code>BEFORE<\/code> \u548c <code>AFTER<\/code> \u65f6\u95f4\u70b9\u4f1a\u5f15\u5165\u989d\u5916\u7684 CPU \u548c\u5185\u5b58\u6d88\u8017\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>I\/O \u8d1f\u62c5<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u5982\u679c\u89e6\u53d1\u5668\u4e2d\u6267\u884c\u5927\u91cf\u7684\u6570\u636e\u8bfb\u5199\uff0c\u4f1a\u663e\u8457\u589e\u52a0\u78c1\u76d8 I\/O \u5f00\u9500\uff0c\u7279\u522b\u662f\u5728 <code>AFTER<\/code> \u89e6\u53d1\u5668\u4e2d\u8fdb\u884c\u6279\u91cf\u63d2\u5165\u6216\u66f4\u65b0\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u9501\u5b9a\u95ee\u9898<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u5728 InnoDB \u8868\u4e0a\u6267\u884c\u5e26\u6709\u89e6\u53d1\u5668\u7684\u64cd\u4f5c\u65f6\uff0c\u53ef\u80fd\u4f1a\u589e\u52a0\u884c\u9501\u3001\u8868\u9501\u7684\u6301\u6709\u65f6\u95f4\uff0c\u5f71\u54cd\u5e76\u53d1\u6027\u80fd\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u5ef6\u8fdf<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u89e6\u53d1\u5668\u4e2d\u7684\u590d\u6742\u903b\u8f91\u4f1a\u589e\u52a0\u4e8b\u52a1\u5904\u7406\u65f6\u95f4\uff0c\u5bfc\u81f4\u8f83\u957f\u7684\u54cd\u5e94\u5ef6\u8fdf\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u8c03\u8bd5\u590d\u6742<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u7531\u4e8e\u89e6\u53d1\u5668\u662f\u5728\u6570\u636e\u5e93\u5c42\u6267\u884c\u7684\uff0c\u95ee\u9898\u6392\u67e5\u96be\u5ea6\u8f83\u9ad8\uff0c\u53ef\u80fd\u5f71\u54cd\u7cfb\u7edf\u7684\u53ef\u7ef4\u62a4\u6027\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>2. \u89e6\u53d1\u5668\u7684\u4f18\u5316\u7b56\u7565<\/strong><\/h3>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>2.1 \u903b\u8f91\u7b80\u5316\u4e0e\u4f18\u5316<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u51cf\u5c11\u590d\u6742\u8ba1\u7b97<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u907f\u514d\u5728\u89e6\u53d1\u5668\u4e2d\u6267\u884c\u590d\u6742\u7684\u67e5\u8be2\u548c\u4e1a\u52a1\u903b\u8f91\uff0c\u4f8b\u5982 <code>JOIN<\/code>\u3001\u5d4c\u5957\u5b50\u67e5\u8be2\u548c\u9012\u5f52\u8c03\u7528\u3002<\/li>\n\n\n\n<li>\u5c06\u90e8\u5206\u903b\u8f91\u79fb\u5230\u5e94\u7528\u5c42\u6216\u5f02\u6b65\u4efb\u52a1\u4e2d\u5904\u7406\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u4f7f\u7528\u6279\u91cf\u5904\u7406<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u5c3d\u91cf\u51cf\u5c11\u9010\u884c\u5904\u7406\uff0c\u53ef\u4ee5\u4f7f\u7528\u6279\u91cf\u63d2\u5165\u6216\u66f4\u65b0\u7684\u65b9\u5f0f\uff0c\u964d\u4f4e\u89e6\u53d1\u5668\u7684\u6267\u884c\u9891\u7387\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p><strong>\u793a\u4f8b\uff1a\u907f\u514d\u9010\u884c\u63d2\u5165<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>-- \u4e0d\u63a8\u8350\uff1a\u9010\u884c\u63d2\u5165\nCREATE TRIGGER before_insert_orders\nBEFORE INSERT ON orders\nFOR EACH ROW\nBEGIN\n    INSERT INTO order_logs (order_id, action, created_at) \n    VALUES (NEW.id, 'INSERT', NOW());\nEND;\n\n-- \u63a8\u8350\uff1a\u6279\u91cf\u5904\u7406\uff08\u901a\u8fc7\u5e94\u7528\u7a0b\u5e8f\uff09\nINSERT INTO order_logs (order_id, action, created_at)\nSELECT id, 'INSERT', NOW() FROM orders WHERE created_at &gt; DATE_SUB(NOW(), INTERVAL 1 DAY);<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>2.2 \u51cf\u5c11\u9501\u4e89\u7528<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u51cf\u5c11\u4e8b\u52a1\u65f6\u95f4<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u5c3d\u91cf\u907f\u514d\u5728\u89e6\u53d1\u5668\u4e2d\u8fdb\u884c\u957f\u65f6\u95f4\u7684\u4e8b\u52a1\u5904\u7406\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u4f18\u5316\u9501\u7b56\u7565<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u5c3d\u91cf\u907f\u514d <code>UPDATE<\/code> \u6216 <code>DELETE<\/code> \u5927\u91cf\u884c\u6570\u636e\uff0c\u51cf\u5c11\u9501\u7684\u6301\u6709\u65f6\u95f4\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u63a7\u5236\u9012\u5f52\u6df1\u5ea6<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u907f\u514d\u89e6\u53d1\u5668\u7684\u9012\u5f52\u8c03\u7528\uff0c\u53ef\u4ee5\u8bbe\u7f6e <code>max_sp_recursion_depth<\/code> \u4ee5\u9650\u5236\u9012\u5f52\u6df1\u5ea6\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p><strong>\u793a\u4f8b\uff1a\u51cf\u5c11\u9501\u5b9a\u65f6\u95f4<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>-- \u4e0d\u63a8\u8350\uff1a\u957f\u65f6\u95f4\u6301\u6709\u9501\nCREATE TRIGGER after_order_update\nAFTER UPDATE ON orders\nFOR EACH ROW\nBEGIN\n    UPDATE order_totals SET total = total + 1 WHERE order_id = NEW.id;\nEND;\n\n-- \u63a8\u8350\uff1a\u51cf\u5c11\u9501\u6301\u6709\u65f6\u95f4\nCREATE TRIGGER after_order_update\nAFTER UPDATE ON orders\nFOR EACH ROW\nBEGIN\n    DECLARE order_total INT;\n    SELECT total INTO order_total FROM order_totals WHERE order_id = NEW.id;\n    SET order_total = order_total + 1;\n    UPDATE order_totals SET total = order_total WHERE order_id = NEW.id;\nEND;<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>2.3 \u907f\u514d\u4e0d\u5fc5\u8981\u7684\u89e6\u53d1<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u53ea\u5728\u9700\u8981\u65f6\u4f7f\u7528\u89e6\u53d1\u5668<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u786e\u4fdd\u89e6\u53d1\u5668\u903b\u8f91\u53ea\u5728\u5fc5\u8981\u65f6\u6267\u884c\uff0c\u907f\u514d\u9891\u7e41\u7684\u65e0\u6548\u89e6\u53d1\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u4f7f\u7528\u6761\u4ef6\u5224\u65ad<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u53ef\u4ee5\u5728\u89e6\u53d1\u5668\u5185\u90e8\u4f7f\u7528 <code>IF<\/code> \u8bed\u53e5\u8fc7\u6ee4\u4e0d\u5fc5\u8981\u7684\u903b\u8f91\u5904\u7406\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p><strong>\u793a\u4f8b\uff1a\u6761\u4ef6\u5224\u65ad<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>CREATE TRIGGER before_order_update\nBEFORE UPDATE ON orders\nFOR EACH ROW\nBEGIN\n    -- \u4ec5\u5f53\u8ba2\u5355\u72b6\u6001\u6539\u53d8\u65f6\u8bb0\u5f55\u65e5\u5fd7\n    IF NEW.status &lt;&gt; OLD.status THEN\n        INSERT INTO order_logs (order_id, action, created_at) \n        VALUES (NEW.id, 'STATUS_CHANGED', NOW());\n    END IF;\nEND;<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>2.4 \u5f02\u6b65\u5904\u7406<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u6d88\u606f\u961f\u5217<\/strong><\/li>\n\n\n\n<li>\u5bf9\u4e8e\u9700\u8981\u5f02\u6b65\u5904\u7406\u7684\u6570\u636e\uff0c\u53ef\u4ee5\u4f7f\u7528 Kafka\u3001RabbitMQ \u6216 Redis Stream \u8fdb\u884c\u89e3\u8026\u3002<\/li>\n\n\n\n<li><strong>\u6570\u636e\u5e93\u4e8b\u4ef6<\/strong><\/li>\n\n\n\n<li>\u4f7f\u7528 MySQL \u4e8b\u4ef6\u8c03\u5ea6\u5668\u5904\u7406\u5b9a\u65f6\u4efb\u52a1\uff0c\u51cf\u5c11\u5b9e\u65f6\u89e6\u53d1\u7684\u538b\u529b\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>3. \u66ff\u4ee3\u65b9\u6848<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u5b58\u50a8\u8fc7\u7a0b\u4e0e\u51fd\u6570<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u5c06\u590d\u6742\u903b\u8f91\u5c01\u88c5\u5230\u5b58\u50a8\u8fc7\u7a0b\u6216\u51fd\u6570\u4e2d\uff0c\u51cf\u5c11\u89e6\u53d1\u5668\u7684\u8d1f\u62c5\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u6570\u636e\u8868\u8bbe\u8ba1\u4f18\u5316<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u901a\u8fc7\u8868\u7684\u89c4\u8303\u5316\u548c\u7d22\u5f15\u4f18\u5316\u51cf\u5c11\u6570\u636e\u67e5\u8be2\u7684\u6210\u672c\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u5206\u533a\u8868<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u5bf9\u5927\u8868\u8fdb\u884c\u5206\u533a\uff0c\u51cf\u5c11\u9501\u5b9a\u548c\u626b\u63cf\u7684\u5f00\u9500\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u6570\u636e\u5e93\u7f13\u5b58<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u5229\u7528 Redis \u6216 Memcached \u51cf\u5c11\u5bf9\u6570\u636e\u5e93\u7684\u76f4\u63a5\u8bbf\u95ee\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>4. \u5b9e\u6218\u5de5\u5177\u4e0e\u5206\u6790<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u4f7f\u7528 <code>EXPLAIN<\/code> \u5206\u6790\u6027\u80fd<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u5b9a\u671f\u5206\u6790\u89e6\u53d1\u5668\u4e2d\u7684 SQL \u8bed\u53e5\uff0c\u786e\u4fdd\u67e5\u8be2\u6027\u80fd\u6700\u4f73\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u6162\u67e5\u8be2\u65e5\u5fd7<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u5f00\u542f <code>slow_query_log<\/code>\uff0c\u5b9a\u4f4d\u6162 SQL \u5e76\u4f18\u5316\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u6027\u80fd\u76d1\u63a7<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u53ef\u4ee5\u4f7f\u7528 <code>pt-query-digest<\/code> \u6216 <code>MySQL Performance Schema<\/code> \u8fdb\u884c\u6027\u80fd\u76d1\u63a7\u548c\u4f18\u5316\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>5. \u63a8\u8350\u9605\u8bfb<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/dev.mysql.com\/doc\/refman\/8.0\/en\/triggers.html\">MySQL \u5b98\u65b9\u6587\u6863 &#8211; \u89e6\u53d1\u5668<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/dev.mysql.com\/doc\/refman\/8.0\/en\/optimizing-performance.html\">MySQL Performance Tuning<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.percona.com\/blog\/10-tips-to-improve-mysql-query-performance\/\">\u4f18\u5316 MySQL \u6570\u636e\u5e93\u7684 10 \u4e2a\u5173\u952e\u6b65\u9aa4<\/a><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u66f4\u591a\u8be6\u7ec6\u5185\u5bb9\u8bf7\u5173\u6ce8\u5176\u4ed6\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 MySQL \u4e2d\u9891\u7e41\u4f7f\u7528\u89e6\u53d1\u5668\u786e\u5b9e\u53ef\u80fd\u5bf9\u6027\u80fd\u9020\u6210\u5f71\u54cd\uff0c\u4e3b\u8981\u539f\u56e0\u5728\u4e8e\u5b83\u4eec\u589e\u52a0\u4e86\u989d\u5916\u7684\u8ba1\u7b97\u548c I\/O \u5f00\u9500\uff0c\u540c\u65f6 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3705,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[35],"tags":[],"class_list":["post-3704","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mysql"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3704","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=3704"}],"version-history":[{"count":3,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3704\/revisions"}],"predecessor-version":[{"id":3709,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/3704\/revisions\/3709"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media\/3705"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=3704"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=3704"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=3704"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}