{"id":200070,"date":"2025-05-06T09:35:18","date_gmt":"2025-05-06T01:35:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/200070\/"},"modified":"2025-05-06T09:35:18","modified_gmt":"2025-05-06T01:35:18","slug":"%e6%b7%b1%e5%85%a5%e6%8e%a2%e8%ae%a8mysql%e8%a7%a6%e5%8f%91%e5%99%a8%e7%9a%84%e5%8f%82%e6%95%b0","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/200070\/","title":{"rendered":"\u6df1\u5165\u63a2\u8ba8MySQL\u89e6\u53d1\u5668\u7684\u53c2\u6570"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>\u6df1\u5165\u63a2\u8ba8MySQL\u89e6\u53d1\u5668\u7684\u53c2\u6570<\/h1>\n<p>MySQL\u89e6\u53d1\u5668\u662f\u4e00\u79cd\u6570\u636e\u5e93\u5bf9\u8c61\uff0c\u80fd\u591f\u5728\u6307\u5b9a\u7684\u8868\u4e0a\u76d1\u542c\u7279\u5b9a\u7684\u4e8b\u4ef6\uff0c\u5e76\u5728\u4e8b\u4ef6\u53d1\u751f\u65f6\u89e6\u53d1\u76f8\u5e94\u7684\u64cd\u4f5c\u3002\u89e6\u53d1\u5668\u901a\u8fc7\u4f7f\u7528SQL\u8bed\u53e5\u6765\u5b9a\u4e49\uff0c\u5e76\u5728\u6570\u636e\u7684\u63d2\u5165\u3001\u66f4\u65b0\u6216\u5220\u9664\u7b49\u64cd\u4f5c\u65f6\u6267\u884c\u3002\u901a\u8fc7\u4f7f\u7528\u89e6\u53d1\u5668\uff0c\u6570\u636e\u5e93\u7ba1\u7406\u5458\u53ef\u4ee5\u7b80\u5316\u64cd\u4f5c\uff0c\u63d0\u9ad8\u6570\u636e\u5e93\u7684\u5b89\u5168\u6027\u548c\u6570\u636e\u5b8c\u6574\u6027\u3002\u5728MySQL\u89e6\u53d1\u5668\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4e00\u4e9b\u5185\u7f6e\u7684\u53c2\u6570\u6765\u8bbf\u95ee\u76f8\u5173\u7684\u6570\u636e\uff0c\u8fd9\u4e9b\u53c2\u6570\u5305\u62ecOLD\u548cNEW\uff0c\u5206\u522b\u8868\u793a\u66f4\u65b0\u524d\u7684\u884c\u503c\u548c\u66f4\u65b0\u540e\u7684\u884c\u503c\u3002\u901a\u8fc7\u4f7f\u7528\u8fd9\u4e9b\u53c2\u6570\uff0c\u53ef\u4ee5\u5728\u89e6\u53d1\u5668\u4e2d\u83b7\u5f97\u7279\u5b9a\u7684\u6570\u636e\u5e76\u8fdb\u884c\u76f8\u5e94\u7684\u64cd\u4f5c\u3002<\/p>\n<p>MySQL\u89e6\u53d1\u5668\u7684\u53c2\u6570\u8be6\u89e3<\/p>\n<p>MySQL\u89e6\u53d1\u5668\u662f\u4e00\u79cd\u6570\u636e\u5e93\u5bf9\u8c61\uff0c\u80fd\u591f\u5728\u6307\u5b9a\u7684\u8868\u4e0a\u76d1\u542c\u7279\u5b9a\u7684\u4e8b\u4ef6\uff0c\u5e76\u5728\u4e8b\u4ef6\u53d1\u751f\u65f6\u89e6\u53d1\u76f8\u5e94\u7684\u64cd\u4f5c\u3002\u5728MySQL\u6570\u636e\u5e93\u4e2d\uff0c\u89e6\u53d1\u5668\u901a\u8fc7\u4f7f\u7528SQL\u8bed\u53e5\u6765\u5b9a\u4e49\uff0c\u5e76\u53ef\u4ee5\u5728\u6570\u636e\u7684\u63d2\u5165\u3001\u66f4\u65b0\u6216\u5220\u9664\u7b49\u64cd\u4f5c\u65f6\u6267\u884c\u3002\u89e6\u53d1\u5668\u53ef\u4ee5\u5e2e\u52a9\u6570\u636e\u5e93\u7ba1\u7406\u5458\u7b80\u5316\u64cd\u4f5c\uff0c\u63d0\u9ad8\u6570\u636e\u5e93\u7684\u5b89\u5168\u6027\u548c\u6570\u636e\u5b8c\u6574\u6027\u3002\u5728\u672c\u6587\u4e2d\uff0c\u5c06\u8be6\u7ec6\u4ecb\u7ecdMySQL\u89e6\u53d1\u5668\u7684\u53c2\u6570\u4ee5\u53ca\u7ed9\u51fa\u5177\u4f53\u7684\u4ee3\u7801\u793a\u4f8b\u3002<\/p>\n<p>MySQL\u89e6\u53d1\u5668\u7684\u57fa\u672c\u8bed\u6cd5\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<pre>CREATE TRIGGER trigger_name\n{BEFORE | AFTER} {INSERT | UPDATE | DELETE}\nON table_name\nFOR EACH ROW\nBEGIN\n    -- \u89e6\u53d1\u5668\u64cd\u4f5c\nEND;<\/pre>\n<p>\u5728\u4e0a\u9762\u7684\u8bed\u6cd5\u4e2d\uff0c\u89e6\u53d1\u5668\u53ef\u4ee5\u5206\u4e3aBEFORE\u548cAFTER\u4e24\u79cd\u7c7b\u578b\uff0c\u5206\u522b\u8868\u793a\u5728\u89e6\u53d1\u4e8b\u4ef6\u4e4b\u524d\u548c\u4e4b\u540e\u6267\u884c\u89e6\u53d1\u5668\u64cd\u4f5c\u3002\u4e8b\u4ef6\u53ef\u4ee5\u662fINSERT\u3001UPDATE\u6216DELETE\u3002<code>table_name<\/code>\u6307\u5b9a\u5728\u54ea\u4e2a\u8868\u4e0a\u521b\u5efa\u89e6\u53d1\u5668\uff0c<code>FOR EACH ROW<\/code>\u8868\u793a\u89e6\u53d1\u5668\u5bf9\u6bcf\u884c\u8bb0\u5f55\u8fdb\u884c\u64cd\u4f5c\u3002\u5728BEGIN\u548cEND\u4e4b\u95f4\u7684\u4ee3\u7801\u5757\u4e2d\u5b9a\u4e49\u4e86\u89e6\u53d1\u5668\u5177\u4f53\u7684\u64cd\u4f5c\u3002<\/p>\n<p>\u5728MySQL\u89e6\u53d1\u5668\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4e00\u4e9b\u5185\u7f6e\u7684\u53c2\u6570\u6765\u8bbf\u95ee\u76f8\u5173\u7684\u6570\u636e\uff0c\u8fd9\u4e9b\u53c2\u6570\u5305\u62ecOLD\u548cNEW\u3002OLD\u8868\u793a\u66f4\u65b0\u524d\u7684\u884c\u503c\uff0c\u53ea\u80fd\u5728UPDATE\u548cDELETE\u4e8b\u4ef6\u4e2d\u4f7f\u7528\uff1bNEW\u8868\u793a\u66f4\u65b0\u540e\u7684\u884c\u503c\uff0c\u53ea\u80fd\u5728UPDATE\u548cINSERT\u4e8b\u4ef6\u4e2d\u4f7f\u7528\u3002\u901a\u8fc7\u4f7f\u7528\u8fd9\u4e9b\u53c2\u6570\uff0c\u53ef\u4ee5\u5728\u89e6\u53d1\u5668\u4e2d\u83b7\u5f97\u7279\u5b9a\u7684\u6570\u636e\u5e76\u8fdb\u884c\u76f8\u5e94\u7684\u64cd\u4f5c\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\u6765\u8bf4\u660e\u8fd9\u4e9b\u89e6\u53d1\u5668\u53c2\u6570\u7684\u4f7f\u7528\uff1a<\/p>\n<pre>CREATE TRIGGER before_insert_trigger\nBEFORE INSERT\nON employees\nFOR EACH ROW\nBEGIN\n    DECLARE user_id INT;\n    SET user_id = NEW.id;\n    INSERT INTO log_table (user_id, action) VALUES (user_id, 'INSERT');\nEND;<\/pre>\n<p>\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u521b\u5efa\u4e86\u4e00\u4e2aBEFORE INSERT\u7684\u89e6\u53d1\u5668\uff0c\u5f53\u5728employees\u8868\u4e2d\u6267\u884c\u63d2\u5165\u64cd\u4f5c\u65f6\uff0c\u4f1a\u5c06\u63d2\u5165\u7684\u884cID\u548c\u52a8\u4f5c\u8bb0\u5f55\u5230log_table\u8868\u4e2d\u3002\u5728BEGIN\u548cEND\u4e4b\u95f4\u7684\u4ee3\u7801\u5757\u4e2d\uff0c\u9996\u5148\u58f0\u660e\u4e86\u4e00\u4e2a\u53d8\u91cfuser_id\u7528\u6765\u5b58\u50a8\u63d2\u5165\u7684\u884cID\uff0c\u7136\u540e\u4f7f\u7528NEW.id\u83b7\u53d6\u63d2\u5165\u64cd\u4f5c\u540e\u7684\u884cID\uff0c\u5e76\u5c06\u76f8\u5e94\u7684\u6570\u636e\u63d2\u5165\u5230log_table\u4e2d\u3002<\/p>\n<p>\u9664\u4e86\u4f7f\u7528\u5185\u7f6e\u7684OLD\u548cNEW\u53c2\u6570\u5916\uff0cMySQL\u89e6\u53d1\u5668\u8fd8\u652f\u6301\u4f7f\u7528\u53d8\u91cf\u3001\u6761\u4ef6\u8bed\u53e5\u548c\u5faa\u73af\u7b49\u6765\u5b9e\u73b0\u66f4\u52a0\u590d\u6742\u7684\u903b\u8f91\u3002\u89e6\u53d1\u5668\u7684\u53c2\u6570\u80fd\u591f\u5e2e\u52a9\u6211\u4eec\u5728\u6570\u636e\u5e93\u64cd\u4f5c\u7684\u8fc7\u7a0b\u4e2d\u83b7\u53d6\u76f8\u5173\u7684\u6570\u636e\u5e76\u8fdb\u884c\u76f8\u5e94\u7684\u5904\u7406\uff0c\u4ece\u800c\u63d0\u9ad8\u6570\u636e\u5e93\u7684\u7075\u6d3b\u6027\u548c\u5b89\u5168\u6027\u3002<\/p>\n<p>\u7efc\u4e0a\u6240\u8ff0\uff0cMySQL\u89e6\u53d1\u5668\u662f\u6570\u636e\u5e93\u4e2d\u975e\u5e38\u91cd\u8981\u7684\u4e00\u79cd\u5bf9\u8c61\uff0c\u901a\u8fc7\u89e6\u53d1\u5668\u53c2\u6570\u7684\u7075\u6d3b\u8fd0\u7528\uff0c\u53ef\u4ee5\u5b9e\u73b0\u66f4\u52a0\u590d\u6742\u548c\u7cbe\u7ec6\u7684\u6570\u636e\u5e93\u64cd\u4f5c\u3002\u5728\u7f16\u5199\u89e6\u53d1\u5668\u65f6\uff0c\u9700\u8981\u5145\u5206\u4e86\u89e3\u5404\u79cd\u53c2\u6570\u7684\u4f7f\u7528\u65b9\u6cd5\uff0c\u5e76\u6839\u636e\u5177\u4f53\u7684\u4e1a\u52a1\u9700\u6c42\u8fdb\u884c\u8c03\u6574\u548c\u4f18\u5316\u3002\u901a\u8fc7\u4e0d\u65ad\u7684\u5b9e\u8df5\u548c\u5b66\u4e60\uff0c\u53ef\u4ee5\u66f4\u597d\u5730\u638c\u63e1MySQL\u89e6\u53d1\u5668\u7684\u5e94\u7528\u6280\u5de7\uff0c\u63d0\u9ad8\u6570\u636e\u5e93\u64cd\u4f5c\u7684\u6548\u7387\u548c\u8d28\u91cf\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u300a\u6df1\u5165\u63a2\u8ba8MySQL\u89e6\u53d1\u5668\u7684\u53c2\u6570\u300b\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u5173\u4e8emysql,\u53c2\u6570,\u89e6\u53d1\u5668\u7684\u8d44\u6599\u8bf7\u5173\u6ce8\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\uff01<\/p>\n<dl>\n<dt>\n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"<p>\u6df1\u5165\u63a2\u8ba8MySQL\u89e6\u53d1\u5668\u7684\u53c2\u6570 &#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-200070","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200070","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"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=200070"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200070\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=200070"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=200070"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=200070"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}