{"id":199682,"date":"2025-05-06T09:03:25","date_gmt":"2025-05-06T01:03:25","guid":{"rendered":"https:\/\/server.hk\/cnblog\/199682\/"},"modified":"2025-05-06T09:03:25","modified_gmt":"2025-05-06T01:03:25","slug":"%e5%a6%82%e4%bd%95%e7%bc%96%e5%86%99sql%e8%a7%a6%e5%8f%91%e5%99%a8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/199682\/","title":{"rendered":"\u5982\u4f55\u7f16\u5199SQL\u89e6\u53d1\u5668"},"content":{"rendered":"

<\/b> <\/p>\n

\u5982\u4f55\u7f16\u5199SQL\u89e6\u53d1\u5668<\/h1>\n

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SQL\u89e6\u53d1\u5668\u662f\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\u4e2d\u7684\u4e00\u79cd\u7279\u6b8a\u5bf9\u8c61\uff0c\u5b83\u53ef\u4ee5\u5728\u6570\u636e\u5e93\u4e2d\u7684\u7279\u5b9a\u4e8b\u4ef6\u53d1\u751f\u65f6\u81ea\u52a8\u6267\u884c\u5b9a\u4e49\u597d\u7684\u52a8\u4f5c\u3002\u89e6\u53d1\u5668\u53ef\u4ee5\u7528\u6765\u5904\u7406\u5404\u79cd\u573a\u666f\uff0c\u5982\u6570\u636e\u7684\u63d2\u5165\u3001\u66f4\u65b0\u6216\u5220\u9664\u3002\u5728\u672c\u6587\u4e2d\uff0c\u6211\u4eec\u5c06\u4ecb\u7ecd\u5982\u4f55\u7f16\u5199SQL\u89e6\u53d1\u5668\u5e76\u7ed9\u51fa\u5177\u4f53\u7684\u4ee3\u7801\u793a\u4f8b\u3002<\/p>\n

SQL\u89e6\u53d1\u5668\u7684\u57fa\u672c\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n

CREATE TRIGGER trigger_name\n{BEFORE | AFTER} {INSERT | UPDATE | DELETE}\nON table_name\n[FOR EACH ROW]\ntrigger_body<\/pre>\n
\u5176\u4e2d\uff0ctrigger_name<\/code>\u662f\u89e6\u53d1\u5668\u7684\u540d\u79f0\uff0cBEFORE<\/code>\u6216AFTER<\/code>\u5173\u952e\u5b57\u6307\u5b9a\u89e6\u53d1\u5668\u5728\u4e8b\u4ef6\u4e4b\u524d\u6216\u4e4b\u540e\u6267\u884c\uff0cINSERT<\/code>\uff0cUPDATE<\/code>\uff0cDELETE<\/code>\u5173\u952e\u5b57\u6307\u5b9a\u89e6\u53d1\u5668\u5173\u8054\u7684\u4e8b\u4ef6\u7c7b\u578b\uff0ctable_name<\/code>\u662f\u89e6\u53d1\u5668\u5173\u8054\u7684\u8868\u540d\u3002FOR EACH ROW<\/code>\u6307\u5b9a\u89e6\u53d1\u5668\u5bf9\u6bcf\u4e00\u884c\u6570\u636e\u90fd\u6267\u884c\uff0ctrigger_body<\/code>\u662f\u89e6\u53d1\u5668\u9700\u8981\u6267\u884c\u7684\u52a8\u4f5c\u3002<\/p>\n
\u4e0b\u9762\u6211\u4eec\u901a\u8fc7\u51e0\u4e2a\u5177\u4f53\u573a\u666f\u6765\u5c55\u793a\u5982\u4f55\u7f16\u5199SQL\u89e6\u53d1\u5668\u3002<\/p>\n
\u573a\u666f\u4e00\uff1a\u5728\u63d2\u5165\u6570\u636e\u4e4b\u524d\u81ea\u52a8\u8bbe\u7f6e\u521b\u5efa\u65f6\u95f4\u3002<\/strong><\/p>\n
\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u540d\u4e3ausers<\/code>\u7684\u8868\uff0c\u5176\u4e2d\u5305\u542bid<\/code>\u3001name<\/code>\u548ccreate_time<\/code>\u4e09\u5217\uff0c\u6211\u4eec\u5e0c\u671b\u5728\u63d2\u5165\u65b0\u7528\u6237\u4e4b\u524d\u81ea\u52a8\u8bbe\u7f6ecreate_time<\/code>\u4e3a\u5f53\u524d\u65f6\u95f4\u3002<\/p>\n
\u4ee3\u7801\u793a\u4f8b\uff1a<\/p>\n
CREATE TRIGGER set_create_time\nBEFORE INSERT\nON users\nFOR EACH ROW\nBEGIN\n    SET NEW.create_time = NOW();\nEND;<\/pre>\n
\u573a\u666f\u4e8c\uff1a\u5728\u66f4\u65b0\u6570\u636e\u4e4b\u540e\u81ea\u52a8\u66f4\u65b0\u4fee\u6539\u65f6\u95f4\u3002<\/strong><\/p>\n
\u73b0\u5728\u5047\u8bbe\u6211\u4eec\u9700\u8981\u5728\u66f4\u65b0\u7528\u6237\u4fe1\u606f\u4e4b\u540e\u81ea\u52a8\u66f4\u65b0update_time<\/code>\u5217\u4e3a\u6700\u65b0\u7684\u4fee\u6539\u65f6\u95f4\u3002<\/p>\n
\u4ee3\u7801\u793a\u4f8b\uff1a<\/p>\n
CREATE TRIGGER set_update_time\nAFTER UPDATE\nON users\nFOR EACH ROW\nBEGIN\n    SET NEW.update_time = NOW();\nEND;<\/pre>\n
\u573a\u666f\u4e09\uff1a\u5728\u5220\u9664\u6570\u636e\u4e4b\u524d\u81ea\u52a8\u5907\u4efd\u5220\u9664\u7684\u6570\u636e\u3002<\/strong><\/p>\n
\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u53ef\u80fd\u9700\u8981\u5728\u5220\u9664\u6570\u636e\u4e4b\u524d\u81ea\u52a8\u5c06\u5f85\u5220\u9664\u7684\u6570\u636e\u5907\u4efd\u5230\u53e6\u5916\u4e00\u4e2a\u8868\u4e2d\u3002<\/p>\n
\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u540d\u4e3auser_backup<\/code>\u7684\u8868\uff0c\u4e0eusers<\/code>\u8868\u7ed3\u6784\u4e00\u81f4\uff0c\u6211\u4eec\u5e0c\u671b\u5728\u5220\u9664\u7528\u6237\u4e4b\u524d\u5907\u4efd\u5f85\u5220\u9664\u7684\u6570\u636e\u5230user_backup<\/code>\u8868\u4e2d\u3002<\/p>\n
\u4ee3\u7801\u793a\u4f8b\uff1a<\/p>\n
CREATE TRIGGER backup_user\nBEFORE DELETE\nON users\nFOR EACH ROW\nBEGIN\n    INSERT INTO user_backup (id, name, create_time)\n    VALUES (OLD.id, OLD.name, OLD.create_time);\nEND;<\/pre>\n
\u4ee5\u4e0a\u662f\u51e0\u4e2a\u5e38\u89c1\u7684SQL\u89e6\u53d1\u5668\u7684\u793a\u4f8b\u3002\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u53ef\u4ee5\u6839\u636e\u9700\u6c42\u7f16\u5199\u66f4\u52a0\u590d\u6742\u7684\u89e6\u53d1\u5668\u3002\u4f46\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u8fc7\u591a\u6216\u590d\u6742\u7684\u89e6\u53d1\u5668\u53ef\u80fd\u4f1a\u5bf9\u6570\u636e\u5e93\u6027\u80fd\u4ea7\u751f\u4e00\u5b9a\u7684\u5f71\u54cd\uff0c\u56e0\u6b64\u5728\u8bbe\u8ba1\u89e6\u53d1\u5668\u65f6\u9700\u8c28\u614e\u8bc4\u4f30\u548c\u8003\u8651\u3002<\/p>\n
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\n
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\u5982\u4f55\u7f16\u5199SQL\u89e6\u53d1\u5668 \u77e5\u8bc6\u70b9\u638c\u63e1...<\/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-199682","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/199682","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=199682"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/199682\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=199682"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=199682"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=199682"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}