{"id":5471,"date":"2024-11-14T08:16:44","date_gmt":"2024-11-14T00:16:44","guid":{"rendered":"https:\/\/fwq.ai\/blog\/5471\/"},"modified":"2024-11-14T08:16:44","modified_gmt":"2024-11-14T00:16:44","slug":"mysql%e8%a7%a6%e5%8f%91%e5%99%a8%e6%80%8e%e4%b9%88%e5%88%9b%e5%bb%ba","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/5471\/","title":{"rendered":"mysql\u89e6\u53d1\u5668\u600e\u4e48\u521b\u5efa"},"content":{"rendered":"

\n \u5728 mysql \u4e2d\u521b\u5efa\u89e6\u53d1\u5668\u6b65\u9aa4\uff1a\u5b9a\u4e49\u89e6\u53d1\u5668\uff1abefore\/after \u64cd\u4f5c\u52a8\u4f5c on \u6307\u5b9a\u8868 for each row\u3002\u6307\u5b9a\u89e6\u53d1\u5668\u4f53\uff1a\u5305\u542b sql \u8bed\u53e5\u6216 pl\/sql \u4ee3\u7801\uff0c\u53ef\u6267\u884c\u63d2\u5165\/\u66f4\u65b0\/\u5220\u9664\u64cd\u4f5c\u3001\u53d1\u9001\u901a\u77e5\u3001\u8bbe\u7f6e\u53d8\u91cf\u6216\u4f7f\u7528\u6761\u4ef6\u3002\u521b\u5efa\u793a\u4f8b\u89e6\u53d1\u5668\uff1a\u63d2\u5165\u65b0\u8bb0\u5f55\u65f6\u5c06 last_updated \u5217\u8bbe\u7f6e\u4e3a\u5f53\u524d\u65f6\u95f4\u3002\n<\/p><\/blockquote>\n

\"mysql\u89e6\u53d1\u5668\u600e\u4e48\u521b\u5efa\u63d2\u56fe\"<\/p>\n

MySQL \u89e6\u53d1\u5668\u521b\u5efa\u6307\u5357<\/strong><\/p>\n

\u5982\u4f55\u521b\u5efa MySQL \u89e6\u53d1\u5668\uff1f<\/strong><\/p>\n

\u5728 MySQL \u4e2d\u521b\u5efa\u89e6\u53d1\u5668\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u6b65\u9aa4\uff1a<\/p>\n

1. \u5b9a\u4e49\u89e6\u53d1\u5668<\/strong><\/p>\n

CREATE TRIGGER [\u89e6\u53d1\u5668\u540d\u79f0]\nBEFORE\/AFTER [ INSERT|UPDATE|DELETE ] ON [\u8868\u540d\u79f0]\nFOR EACH ROW<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
    \n
  •  \u89e6\u53d1\u5668\u540d\u79f0\uff1a<\/strong>\u81ea\u5b9a\u4e49\u7684\u89e6\u53d1\u5668\u540d\u79f0\u3002<\/li>\n
  •  BEFORE\/AFTER\uff1a<\/strong>\u89e6\u53d1\u5668\u5728\u64cd\u4f5c\u524d\u6216\u64cd\u4f5c\u540e\u6267\u884c\u3002<\/li>\n
  •  INSERT\/UPDATE\/DELETE\uff1a<\/strong>\u89e6\u53d1\u64cd\u4f5c\u7c7b\u578b\u3002<\/li>\n
  •  \u8868\u540d\u79f0\uff1a<\/strong>\u6307\u5b9a\u89e6\u53d1\u7684\u8868\u3002<\/li>\n
  •  FOR EACH ROW\uff1a<\/strong>\u89e6\u53d1\u5668\u5bf9\u6bcf\u4e00\u884c\u88ab\u4fee\u6539\u7684\u6570\u636e\u6267\u884c\u3002<\/li>\n<\/ul>\n
    2. \u6307\u5b9a\u89e6\u53d1\u5668\u4f53<\/strong><\/p>\n
    \u89e6\u53d1\u5668\u4f53\u5305\u542b\u8981\u6267\u884c\u7684 SQL \u8bed\u53e5\u6216 PL\/SQL \u4ee3\u7801\u3002\u89e6\u53d1\u5668\u4f53\u53ef\u4ee5\u5305\u542b\u4ee5\u4e0b\u5185\u5bb9\uff1a<\/p>\n
      \n
    •  \u63d2\u5165\u6216\u66f4\u65b0\u6570\u636e\uff1a<\/strong>\u4f7f\u7528 INSERT \u6216 UPDATE \u8bed\u53e5\u5411\u5176\u4ed6\u8868\u6dfb\u52a0\u6216\u4fee\u6539\u6570\u636e\u3002<\/li>\n
    •  \u5220\u9664\u6570\u636e\uff1a<\/strong>\u4f7f\u7528 DELETE \u8bed\u53e5\u4ece\u5176\u4ed6\u8868\u4e2d\u5220\u9664\u6570\u636e\u3002<\/li>\n
    •  \u53d1\u9001\u901a\u77e5\uff1a<\/strong>\u4f7f\u7528 SIGNAL \u8bed\u53e5\u89e6\u53d1\u5b58\u50a8\u8fc7\u7a0b\u6216\u51fd\u6570\u3002<\/li>\n
    •  \u8bbe\u7f6e\u53d8\u91cf\uff1a<\/strong>\u4f7f\u7528 SET \u8bed\u53e5\u8bbe\u7f6e\u7528\u4e8e\u89e6\u53d1\u5668\u4f53\u7684\u5c40\u90e8\u53d8\u91cf\u3002<\/li>\n
    •  \u4f7f\u7528\u6761\u4ef6\uff1a<\/strong>\u4f7f\u7528 IF \u8bed\u53e5\u57fa\u4e8e\u7279\u5b9a\u6761\u4ef6\u6267\u884c\u64cd\u4f5c\u3002<\/li>\n<\/ul>\n
      3. \u521b\u5efa\u793a\u4f8b\u89e6\u53d1\u5668<\/strong><\/p>\n
      \u4e0b\u9762\u662f\u4e00\u4e2a\u5728 products \u8868\u4e2d\u63d2\u5165\u65b0\u8bb0\u5f55\u65f6\u5c06 last_updated \u5217\u8bbe\u7f6e\u4e3a\u5f53\u524d\u65f6\u95f4\u7684\u793a\u4f8b\u89e6\u53d1\u5668\uff1a<\/p>\n
      CREATE TRIGGER set_last_updated\nBEFORE INSERT ON products\nFOR EACH ROW\nSET NEW.last_updated = NOW();<\/pre>\n
       \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
      \u6ce8\u610f\uff1a<\/strong><\/p>\n
        \n
      • \u89e6\u53d1\u5668\u5fc5\u987b\u5728\u8981\u89e6\u53d1\u7684\u8868\u4e0a\u521b\u5efa\u3002<\/li>\n
      • \u89e6\u53d1\u5668\u53ef\u4ee5\u5728\u6570\u636e\u5e93\u3001\u6a21\u5f0f\u6216\u8868\u7ea7\u522b\u521b\u5efa\u3002<\/li>\n
      • \u89e6\u53d1\u5668\u53ef\u4ee5\u88ab\u7981\u7528\u6216\u5220\u9664\u3002<\/li>\n
      • \u5e94\u8c28\u614e\u4f7f\u7528\u89e6\u53d1\u5668\uff0c\u56e0\u4e3a\u5b83\u4eec\u53ef\u80fd\u4f1a\u5f71\u54cd\u6570\u636e\u5e93\u6027\u80fd\u3002<\/li>\n<\/ul>\n
        \u4ee5\u4e0a\u5c31\u662f\u89e6\u53d1\u5668\u600e\u4e48\u521b\u5efa\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\u521b\u5efa\u89e6\u53d1\u5668\u6b65\u9aa4\uff1a\u5b9a\u4e49\u89e6\u53d1\u5668\uff1abefore\/after \u64cd\u4f5c\u52a8\u4f5c on \u6307\u5b9a\u8868 for each row\u3002\u6307\u5b9a\u89e6\u53d1\u5668\u4f53\uff1a\u5305\u542b sql \u8bed\u53e5\u6216 pl\/sql \u4ee3\u7801\uff0c\u53ef\u6267\u884c\u63d2\u5165\/\u66f4\u65b0\/\u5220\u9664\u64cd\u4f5c\u3001\u53d1\u9001\u901a\u77e5\u3001\u8bbe\u7f6e\u53d8\u91cf\u6216\u4f7f\u7528\u6761\u4ef6\u3002\u521b\u5efa\u793a\u4f8b\u89e6\u53d1\u5668\uff1a\u63d2\u5165\u65b0\u8bb0\u5f55\u65f6\u5c06 last_updated \u5217\u8bbe\u7f6e\u4e3a\u5f53\u524d\u65f6\u95f4\u3002 MySQL \u89e6\u53d1\u5668\u521b\u5efa\u6307\u5357 \u5982\u4f55\u521b\u5efa MySQL \u89e6\u53d1\u5668\uff1f \u5728 MySQL \u4e2d\u521b\u5efa\u89e6\u53d1\u5668\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u6b65\u9aa4\uff1a 1. \u5b9a\u4e49\u89e6\u53d1\u5668 CREATE TRIGGER [\u89e6\u53d1\u5668\u540d\u79f0] BEFORE\/AFTER [ INSERT|UPDATE|DELETE ] ON [\u8868\u540d\u79f0] FOR EACH ROW \u767b\u5f55\u540e\u590d\u5236 \u89e6\u53d1\u5668\u540d\u79f0\uff1a\u81ea\u5b9a\u4e49\u7684\u89e6\u53d1\u5668\u540d\u79f0\u3002 BEFORE\/AFTER\uff1a\u89e6\u53d1\u5668\u5728\u64cd\u4f5c\u524d\u6216\u64cd\u4f5c\u540e\u6267\u884c\u3002 INSERT\/UPDATE\/DELETE\uff1a\u89e6\u53d1\u64cd\u4f5c\u7c7b\u578b\u3002 \u8868\u540d\u79f0\uff1a\u6307\u5b9a\u89e6\u53d1\u7684\u8868\u3002 FOR EACH ROW\uff1a\u89e6\u53d1\u5668\u5bf9\u6bcf\u4e00\u884c\u88ab\u4fee\u6539\u7684\u6570\u636e\u6267\u884c\u3002 2. \u6307\u5b9a\u89e6\u53d1\u5668\u4f53 \u89e6\u53d1\u5668\u4f53\u5305\u542b\u8981\u6267\u884c\u7684 SQL \u8bed\u53e5\u6216 PL\/SQL \u4ee3\u7801\u3002\u89e6\u53d1\u5668\u4f53\u53ef\u4ee5\u5305\u542b\u4ee5\u4e0b\u5185\u5bb9\uff1a \u63d2\u5165\u6216\u66f4\u65b0\u6570\u636e\uff1a\u4f7f\u7528 INSERT \u6216 […]<\/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-5471","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5471","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=5471"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5471\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=5471"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=5471"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=5471"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}