{"id":27721,"date":"2024-11-24T16:34:00","date_gmt":"2024-11-24T08:34:00","guid":{"rendered":"https:\/\/fwq.ai\/blog\/27721\/"},"modified":"2024-11-24T16:34:00","modified_gmt":"2024-11-24T08:34:00","slug":"mysql-%e7%bb%9f%e8%ae%a1-30-%e4%b8%87%e6%9d%a1%e6%95%b0%e6%8d%ae%e8%80%97%e6%97%b6-13-%e7%a7%92%ef%bc%8c%e6%ad%a3%e5%b8%b8%e5%90%97%ef%bc%9f%e5%a6%82%e4%bd%95%e4%bc%98%e5%8c%96%ef%bc%9f-2","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/27721\/","title":{"rendered":"MYSQL \u7edf\u8ba1 30 \u4e07\u6761\u6570\u636e\u8017\u65f6 13 \u79d2\uff0c\u6b63\u5e38\u5417\uff1f\u5982\u4f55\u4f18\u5316\uff1f"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/001\/246\/273\/173130859756452.jpg\" class=\"aligncenter\" title=\"MYSQL \u7edf\u8ba1 30 \u4e07\u6761\u6570\u636e\u8017\u65f6 13 \u79d2\uff0c\u6b63\u5e38\u5417\uff1f\u5982\u4f55\u4f18\u5316\uff1f\u63d2\u56fe\" alt=\"MYSQL \u7edf\u8ba1 30 \u4e07\u6761\u6570\u636e\u8017\u65f6 13 \u79d2\uff0c\u6b63\u5e38\u5417\uff1f\u5982\u4f55\u4f18\u5316\uff1f\u63d2\u56fe\" \/><\/p>\n<p><strong> \u7edf\u8ba1\u8fd1 30 \u4e07\u6761\u6570\u636e\u65f6\u95f4\u8fc7\u957f\uff1f<\/strong><\/p>\n<p>\u5f53\u9700\u8981\u7edf\u8ba1\u5927\u91cf\u6570\u636e\u65f6\uff0c\u4f8b\u5982\u8fd9\u91cc\u63d0\u5230\u7684\u4e8c\u5341\u4e5d\u4e07\u6761\u6570\u636e\uff0cmysql \u7684\u6267\u884c\u901f\u5ea6\u4f3c\u4e4e\u4ee4\u4eba\u62c5\u5fe7\uff0c\u76f4\u63a5\u4f7f\u7528 count(*) \u67e5\u8be2\u9700\u8981 13 \u79d2\u591a\u3002\u5bf9\u4e8e\u8fd9\u79cd\u6570\u91cf\u7ea7\u7684\u6570\u636e\uff0c\u8fd9\u4e2a\u65f6\u95f4\u5f00\u9500\u662f\u5426\u6b63\u5e38\u5462\uff1f<\/p>\n<p><strong>\u53ef\u80fd\u7684\u4f18\u5316\u65b9\u6848<\/strong><\/p>\n<ul>\n<li> <strong>\u907f\u514d\u4f7f\u7528 count(*)\uff1a<\/strong> count(*) \u5bf9\u6574\u4e2a\u8868\u8fdb\u884c\u5168\u8868\u626b\u63cf\uff0c\u5bf9\u4e8e\u5927\u8868\u6765\u8bf4\u4ee3\u4ef7\u6bd4\u8f83\u9ad8\u3002\u5efa\u8bae\u5c06\u5176\u66ff\u6362\u4e3a\u6761\u4ef6\u67e5\u8be2\u6216\u7d22\u5f15\u626b\u63cf\u3002<\/li>\n<li> <strong>\u7ef4\u62a4\u7edf\u8ba1\u6570\u636e\uff1a<\/strong> \u4e0d\u8981\u5728\u6bcf\u6b21\u67e5\u8be2\u65f6\u90fd\u7edf\u8ba1\uff0c\u53ef\u4ee5\u8003\u8651\u901a\u8fc7\u89e6\u53d1\u5668\u6216\u5176\u4ed6\u673a\u5236\u5728\u6570\u636e\u66f4\u65b0\u65f6\u81ea\u52a8\u7ef4\u62a4\u7edf\u8ba1\u6570\u636e\u3002<\/li>\n<li> <strong>\u5229\u7528\u89e6\u53d1\u5668\uff1a<\/strong> mysql \u652f\u6301\u4f7f\u7528\u89e6\u53d1\u5668\u6765\u5728\u4e8b\u4ef6\u53d1\u751f\u65f6\u81ea\u52a8\u6267\u884c\u4efb\u52a1\uff0c\u53ef\u4ee5\u5728\u6570\u636e\u66f4\u65b0\u65f6\u81ea\u52a8\u66f4\u65b0\u7edf\u8ba1\u6570\u636e\uff0c\u907f\u514d\u624b\u52a8\u7ef4\u62a4\u3002<\/li>\n<\/ul>\n<p><strong>\u5177\u4f53\u5b9e\u73b0<\/strong><\/p>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e2a\u4f7f\u7528\u89e6\u53d1\u5668\u7ef4\u62a4\u7edf\u8ba1\u6570\u636e\u7684\u793a\u4f8b\uff1a<\/p>\n<pre>CREATE TRIGGER `trigger_t_order` AFTER INSERT ON `t_order_old`\nFOR EACH ROW\nBEGIN\n  -- \u66f4\u65b0\u7edf\u8ba1\u6570\u636e\n  UPDATE `t_order_stats` SET `count` = `count` + 1 WHERE `order_id` = NEW.`order_id`;\nEND<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 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\u79d2\u591a\u3002\u5bf9\u4e8e\u8fd9\u79cd\u6570\u91cf\u7ea7\u7684\u6570\u636e\uff0c\u8fd9\u4e2a\u65f6\u95f4\u5f00\u9500\u662f\u5426\u6b63\u5e38\u5462\uff1f \u53ef\u80fd\u7684\u4f18\u5316\u65b9\u6848 \u907f\u514d\u4f7f\u7528 count(*)\uff1a count(*) \u5bf9\u6574\u4e2a\u8868\u8fdb\u884c\u5168\u8868\u626b\u63cf\uff0c\u5bf9\u4e8e\u5927\u8868\u6765\u8bf4\u4ee3\u4ef7\u6bd4\u8f83\u9ad8\u3002\u5efa\u8bae\u5c06\u5176\u66ff\u6362\u4e3a\u6761\u4ef6\u67e5\u8be2\u6216\u7d22\u5f15\u626b\u63cf\u3002 \u7ef4\u62a4\u7edf\u8ba1\u6570\u636e\uff1a \u4e0d\u8981\u5728\u6bcf\u6b21\u67e5\u8be2\u65f6\u90fd\u7edf\u8ba1\uff0c\u53ef\u4ee5\u8003\u8651\u901a\u8fc7\u89e6\u53d1\u5668\u6216\u5176\u4ed6\u673a\u5236\u5728\u6570\u636e\u66f4\u65b0\u65f6\u81ea\u52a8\u7ef4\u62a4\u7edf\u8ba1\u6570\u636e\u3002 \u5229\u7528\u89e6\u53d1\u5668\uff1a mysql \u652f\u6301\u4f7f\u7528\u89e6\u53d1\u5668\u6765\u5728\u4e8b\u4ef6\u53d1\u751f\u65f6\u81ea\u52a8\u6267\u884c\u4efb\u52a1\uff0c\u53ef\u4ee5\u5728\u6570\u636e\u66f4\u65b0\u65f6\u81ea\u52a8\u66f4\u65b0\u7edf\u8ba1\u6570\u636e\uff0c\u907f\u514d\u624b\u52a8\u7ef4\u62a4\u3002 \u5177\u4f53\u5b9e\u73b0 \u4ee5\u4e0b\u662f\u4e00\u4e2a\u4f7f\u7528\u89e6\u53d1\u5668\u7ef4\u62a4\u7edf\u8ba1\u6570\u636e\u7684\u793a\u4f8b\uff1a CREATE TRIGGER `trigger_t_order` AFTER INSERT ON `t_order_old` FOR EACH ROW BEGIN &#8212; \u66f4\u65b0\u7edf\u8ba1\u6570\u636e UPDATE `t_order_stats` SET `count` = `count` + 1 WHERE `order_id` = NEW.`order_id`; END \u767b\u5f55\u540e\u590d\u5236 \u901a\u8fc7\u8fd9\u6837\u7684\u65b9\u6cd5\uff0c\u53ef\u4ee5\u4f7f\u7528\u6237\u5728\u9700\u8981\u65f6\u5feb\u901f\u83b7\u53d6\u7edf\u8ba1\u6570\u636e\uff0c\u800c\u65e0\u9700\u6bcf\u6b21\u90fd\u5bf9\u5927\u91cf\u6570\u636e\u8fdb\u884c\u626b\u63cf\u3002 \u4ee5\u4e0a\u5c31\u662fMYSQL \u7edf\u8ba1 30 \u4e07\u6761\u6570\u636e\u8017\u65f6 13 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