{"id":5286,"date":"2024-11-14T10:14:38","date_gmt":"2024-11-14T02:14:38","guid":{"rendered":"https:\/\/fwq.ai\/blog\/5286\/"},"modified":"2024-11-14T10:14:38","modified_gmt":"2024-11-14T02:14:38","slug":"mysql%e6%80%8e%e4%b9%88%e5%ae%9e%e7%8e%b0%e8%a7%a6%e5%8f%91%e5%99%a8","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/5286\/","title":{"rendered":"mysql\u600e\u4e48\u5b9e\u73b0\u89e6\u53d1\u5668"},"content":{"rendered":"

\n \u5728 mysql \u4e2d\u5b9e\u73b0\u89e6\u53d1\u5668\u53ef\u4ee5\u9075\u5faa\u4ee5\u4e0b\u6b65\u9aa4\uff1a1. \u521b\u5efa\u89e6\u53d1\u5668\uff0c\u6307\u5b9a\u5176\u540d\u79f0\u3001\u89e6\u53d1\u65f6\u673a\u3001\u64cd\u4f5c\u7c7b\u578b\u3001\u5173\u8054\u8868\u548c\u89e6\u53d1\u5668\u4ee3\u7801\uff1b2. \u5b9a\u4e49\u89e6\u53d1\u5668\u64cd\u4f5c\uff0c\u5305\u62ec\u63d2\u5165\u6216\u66f4\u65b0\u8868\u3001\u53d1\u9001\u901a\u77e5\u3001\u8bb0\u5f55\u5ba1\u8ba1\u4fe1\u606f\u548c\u9a8c\u8bc1\u6570\u636e\u5b8c\u6574\u6027\uff1b3. \u6307\u5b9a\u89e6\u53d1\u5668\u6761\u4ef6\uff08\u53ef\u9009\uff09\uff0c\u4ec5\u5728\u6ee1\u8db3\u7279\u5b9a\u6761\u4ef6\u65f6\u89e6\u53d1\u3002\n<\/p><\/blockquote>\n

\"mysql\u600e\u4e48\u5b9e\u73b0\u89e6\u53d1\u5668\u63d2\u56fe\"<\/p>\n

\u5982\u4f55\u5728 MySQL \u4e2d\u5b9e\u73b0\u89e6\u53d1\u5668<\/strong><\/p>\n

\u89e6\u53d1\u5668\u662f\u4e00\u79cd\u6570\u636e\u5e93\u5bf9\u8c61\uff0c\u5f53\u5bf9\u7279\u5b9a\u8868\u6267\u884c\u7279\u5b9a\u7684\u64cd\u4f5c\u65f6\uff0c\u5b83\u4f1a\u81ea\u52a8\u6267\u884c\u4e00\u7cfb\u5217\u64cd\u4f5c\u3002\u5728 MySQL \u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u6b65\u9aa4\u5b9e\u73b0\u89e6\u53d1\u5668\uff1a<\/p>\n

1. \u521b\u5efa\u89e6\u53d1\u5668<\/strong><\/p>\n

CREATE TRIGGER trigger_name\nBEFORE | AFTER [INSERT | UPDATE | DELETE]\nON table_name\nFOR EACH ROW\nAS\nBEGIN\n  -- \u89e6\u53d1\u5668\u4ee3\u7801\nEND;<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
    \n
  •  trigger_name\uff1a<\/strong>\u89e6\u53d1\u5668\u7684\u540d\u79f0\u3002<\/li>\n
  •  BEFORE | AFTER\uff1a<\/strong>\u6307\u5b9a\u89e6\u53d1\u5668\u662f\u5728\u64cd\u4f5c\u4e4b\u524d\u8fd8\u662f\u4e4b\u540e\u89e6\u53d1\u3002<\/li>\n
  •  INSERT | UPDATE | DELETE\uff1a<\/strong>\u6307\u5b9a\u89e6\u53d1\u5668\u7684\u64cd\u4f5c\u7c7b\u578b\u3002<\/li>\n
  •  table_name\uff1a<\/strong>\u6307\u5b9a\u89e6\u53d1\u5668\u5173\u8054\u7684\u8868\u3002<\/li>\n
  •  FOR EACH ROW\uff1a<\/strong>\u6307\u5b9a\u89e6\u53d1\u5668\u4e3a\u53d7\u5f71\u54cd\u7684\u6bcf\u4e00\u884c\u6267\u884c\u3002<\/li>\n
  •  \u89e6\u53d1\u5668\u4ee3\u7801\uff1a<\/strong>\u89e6\u53d1\u5668\u6267\u884c\u7684 SQL \u8bed\u53e5\u548c\u5176\u4ed6\u64cd\u4f5c\u3002<\/li>\n<\/ul>\n
    2. \u5b9a\u4e49\u89e6\u53d1\u5668\u64cd\u4f5c<\/strong><\/p>\n
    \u89e6\u53d1\u5668\u4ee3\u7801\u90e8\u5206\u5305\u542b\u8981\u7531\u89e6\u53d1\u5668\u6267\u884c\u7684\u64cd\u4f5c\u3002\u5e38\u89c1\u64cd\u4f5c\u5305\u62ec\uff1a<\/p>\n
      \n
    • \u63d2\u5165\u6216\u66f4\u65b0\u5176\u4ed6\u8868<\/li>\n
    • \u53d1\u9001\u7535\u5b50\u90ae\u4ef6\u901a\u77e5<\/li>\n
    • \u8bb0\u5f55\u5ba1\u8ba1\u4fe1\u606f<\/li>\n
    • \u9a8c\u8bc1\u6570\u636e\u5b8c\u6574\u6027<\/li>\n<\/ul>\n
      3. \u6307\u5b9a\u89e6\u53d1\u5668\u6761\u4ef6\uff08\u53ef\u9009\uff09<\/strong><\/p>\n
      \u89e6\u53d1\u5668\u53ef\u4ee5\u5305\u542b\u6761\u4ef6\uff0c\u6307\u5b9a\u4ec5\u5728\u6ee1\u8db3\u7279\u5b9a\u6761\u4ef6\u65f6\u624d\u89e6\u53d1\u3002\u6761\u4ef6\u4f7f\u7528 WHEN \u5b50\u53e5\u6307\u5b9a\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n
      CREATE TRIGGER trigger_name\n...\nWHEN (condition)\nAS\nBEGIN\n  -- \u89e6\u53d1\u5668\u4ee3\u7801\nEND;<\/pre>\n
       \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
      \u793a\u4f8b<\/strong><\/p>\n
      \u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u540d\u4e3a orders \u7684\u8868\uff0c\u5176\u4e2d\u5305\u542b\u5ba2\u6237\u8ba2\u5355\u4fe1\u606f\u3002\u6211\u4eec\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u89e6\u53d1\u5668\uff0c\u5728\u66f4\u65b0\u8ba2\u5355\u7684\u72b6\u6001\u65f6\u53d1\u9001\u7535\u5b50\u90ae\u4ef6\u901a\u77e5\uff1a<\/p>\n
      CREATE TRIGGER order_status_update\nAFTER UPDATE ON orders\nFOR EACH ROW\nWHEN (new.status <> old.status)\nAS\nBEGIN\n  -- \u53d1\u9001\u7535\u5b50\u90ae\u4ef6\u901a\u77e5\n  SEND EMAIL TO customer_email\n  WITH SUBJECT 'Order Status Updated'\n  BODY 'Your order status has been updated to ' || new.status;\nEND;<\/pre>\n
       \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
      \u901a\u8fc7\u4e0a\u8ff0\u6b65\u9aa4\uff0c\u60a8\u53ef\u4ee5\u5728 MySQL \u4e2d\u521b\u5efa\u5e76\u5b9e\u73b0\u89e6\u53d1\u5668\uff0c\u4ee5\u81ea\u52a8\u6267\u884c\u7279\u5b9a\u64cd\u4f5c\u5e76\u786e\u4fdd\u6570\u636e\u5b8c\u6574\u6027\u3002<\/p>\n
      \u4ee5\u4e0a\u5c31\u662f\u600e\u4e48\u5b9e\u73b0\u89e6\u53d1\u5668\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u7f51\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
      \u5728 mysql \u4e2d\u5b9e\u73b0\u89e6\u53d1\u5668\u53ef\u4ee5\u9075\u5faa\u4ee5\u4e0b\u6b65\u9aa4\uff1a1. \u521b\u5efa\u89e6\u53d1\u5668\uff0c\u6307\u5b9a\u5176\u540d\u79f0\u3001\u89e6\u53d1\u65f6\u673a\u3001\u64cd\u4f5c\u7c7b\u578b\u3001\u5173\u8054\u8868\u548c\u89e6\u53d1\u5668\u4ee3\u7801\uff1b2. \u5b9a\u4e49\u89e6\u53d1\u5668\u64cd\u4f5c\uff0c\u5305\u62ec\u63d2\u5165\u6216\u66f4\u65b0\u8868\u3001\u53d1\u9001\u901a\u77e5\u3001\u8bb0\u5f55\u5ba1\u8ba1\u4fe1\u606f\u548c\u9a8c\u8bc1\u6570\u636e\u5b8c\u6574\u6027\uff1b3. \u6307\u5b9a\u89e6\u53d1\u5668\u6761\u4ef6\uff08\u53ef\u9009\uff09\uff0c\u4ec5\u5728\u6ee1\u8db3\u7279\u5b9a\u6761\u4ef6\u65f6\u89e6\u53d1\u3002 \u5982\u4f55\u5728 MySQL \u4e2d\u5b9e\u73b0\u89e6\u53d1\u5668 \u89e6\u53d1\u5668\u662f\u4e00\u79cd\u6570\u636e\u5e93\u5bf9\u8c61\uff0c\u5f53\u5bf9\u7279\u5b9a\u8868\u6267\u884c\u7279\u5b9a\u7684\u64cd\u4f5c\u65f6\uff0c\u5b83\u4f1a\u81ea\u52a8\u6267\u884c\u4e00\u7cfb\u5217\u64cd\u4f5c\u3002\u5728 MySQL \u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u6b65\u9aa4\u5b9e\u73b0\u89e6\u53d1\u5668\uff1a 1. \u521b\u5efa\u89e6\u53d1\u5668 CREATE TRIGGER trigger_name BEFORE | AFTER [INSERT | UPDATE | DELETE] ON table_name FOR EACH ROW AS BEGIN — \u89e6\u53d1\u5668\u4ee3\u7801 END; \u767b\u5f55\u540e\u590d\u5236 trigger_name\uff1a\u89e6\u53d1\u5668\u7684\u540d\u79f0\u3002 BEFORE | AFTER\uff1a\u6307\u5b9a\u89e6\u53d1\u5668\u662f\u5728\u64cd\u4f5c\u4e4b\u524d\u8fd8\u662f\u4e4b\u540e\u89e6\u53d1\u3002 INSERT | UPDATE | DELETE\uff1a\u6307\u5b9a\u89e6\u53d1\u5668\u7684\u64cd\u4f5c\u7c7b\u578b\u3002 table_name\uff1a\u6307\u5b9a\u89e6\u53d1\u5668\u5173\u8054\u7684\u8868\u3002 FOR EACH ROW\uff1a\u6307\u5b9a\u89e6\u53d1\u5668\u4e3a\u53d7\u5f71\u54cd\u7684\u6bcf\u4e00\u884c\u6267\u884c\u3002 \u89e6\u53d1\u5668\u4ee3\u7801\uff1a\u89e6\u53d1\u5668\u6267\u884c\u7684 SQL \u8bed\u53e5\u548c\u5176\u4ed6\u64cd\u4f5c\u3002 2. \u5b9a\u4e49\u89e6\u53d1\u5668\u64cd\u4f5c \u89e6\u53d1\u5668\u4ee3\u7801\u90e8\u5206\u5305\u542b\u8981\u7531\u89e6\u53d1\u5668\u6267\u884c\u7684\u64cd\u4f5c\u3002\u5e38\u89c1\u64cd\u4f5c\u5305\u62ec\uff1a […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-5286","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5286","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=5286"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5286\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=5286"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=5286"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=5286"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}