{"id":153051,"date":"2024-11-02T04:13:18","date_gmt":"2024-11-01T20:13:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/153051\/"},"modified":"2024-11-02T04:13:19","modified_gmt":"2024-11-01T20:13:19","slug":"%e5%89%b5%e5%bb%ba-mysql-%e8%a7%b8%e7%99%bc%e5%99%a8%e7%9a%84%e8%aa%9e%e6%b3%95%e4%bb%8b%e7%b4%b9","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/153051\/","title":{"rendered":"\u5275\u5efa MySQL \u89f8\u767c\u5668\u7684\u8a9e\u6cd5\u4ecb\u7d39"},"content":{"rendered":"<h1 id=\"%e5%89%b5%e5%bb%ba-mysql-%e8%a7%b8%e7%99%bc%e5%99%a8%e7%9a%84%e8%aa%9e%e6%b3%95%e4%bb%8b%e7%b4%b9-VjhaIFntwB\">\u5275\u5efa MySQL \u89f8\u767c\u5668\u7684\u8a9e\u6cd5\u4ecb\u7d39<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u89f8\u767c\u5668\uff08Trigger\uff09\u662f\u4e00\u7a2e\u975e\u5e38\u6709\u7528\u7684\u529f\u80fd\u3002\u5b83\u53ef\u4ee5\u81ea\u52d5\u57f7\u884c\u7279\u5b9a\u7684\u64cd\u4f5c\uff0c\u7576\u67d0\u4e9b\u4e8b\u4ef6\u767c\u751f\u6642\uff0c\u4f8b\u5982\u63d2\u5165\u3001\u66f4\u65b0\u6216\u522a\u9664\u6578\u64da\u3002MySQL \u4f5c\u70ba\u4e00\u500b\u6d41\u884c\u7684\u958b\u6e90\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u5f37\u5927\u7684\u89f8\u767c\u5668\u529f\u80fd\u3002\u672c\u6587\u5c07\u4ecb\u7d39 MySQL \u89f8\u767c\u5668\u7684\u57fa\u672c\u8a9e\u6cd5\u53ca\u5176\u4f7f\u7528\u65b9\u6cd5\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af-mysql-%e8%a7%b8%e7%99%bc%e5%99%a8%ef%bc%9f-VjhaIFntwB\">\u4ec0\u9ebc\u662f MySQL \u89f8\u767c\u5668\uff1f<\/h2>\n<p>\u89f8\u767c\u5668\u662f\u4e00\u7a2e\u7279\u6b8a\u7684\u5b58\u5132\u7a0b\u5e8f\uff0c\u5b83\u5728\u7279\u5b9a\u4e8b\u4ef6\u767c\u751f\u6642\u81ea\u52d5\u57f7\u884c\u3002\u9019\u4e9b\u4e8b\u4ef6\u901a\u5e38\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>INSERT\uff1a\u7576\u6709\u65b0\u6578\u64da\u63d2\u5165\u5230\u8868\u4e2d\u6642\u3002<\/li>\n<li>UPDATE\uff1a\u7576\u8868\u4e2d\u7684\u6578\u64da\u88ab\u66f4\u65b0\u6642\u3002<\/li>\n<li>DELETE\uff1a\u7576\u8868\u4e2d\u7684\u6578\u64da\u88ab\u522a\u9664\u6642\u3002<\/li>\n<\/ul>\n<p>\u89f8\u767c\u5668\u53ef\u4ee5\u7528\u4f86\u57f7\u884c\u6578\u64da\u9a57\u8b49\u3001\u8a18\u9304\u8b8a\u66f4\u3001\u7dad\u8b77\u6578\u64da\u5b8c\u6574\u6027\u7b49\u64cd\u4f5c\u3002<\/p>\n<h2 id=\"mysql-%e8%a7%b8%e7%99%bc%e5%99%a8%e7%9a%84%e8%aa%9e%e6%b3%95-VjhaIFntwB\">MySQL \u89f8\u767c\u5668\u7684\u8a9e\u6cd5<\/h2>\n<p>\u5275\u5efa\u89f8\u767c\u5668\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>CREATE TRIGGER \u89f8\u767c\u5668\u540d\u7a31\n    BEFORE|AFTER INSERT|UPDATE|DELETE\n    ON \u8868\u540d\u7a31\n    FOR EACH ROW\n    BEGIN\n        -- \u89f8\u767c\u5668\u908f\u8f2f\n    END;<\/code><\/pre>\n<h3 id=\"%e8%aa%9e%e6%b3%95%e8%a7%a3%e6%9e%90-VjhaIFntwB\">\u8a9e\u6cd5\u89e3\u6790<\/h3>\n<ul>\n<li><strong>CREATE TRIGGER \u89f8\u767c\u5668\u540d\u7a31\uff1a<\/strong>\u6307\u5b9a\u89f8\u767c\u5668\u7684\u540d\u7a31\u3002<\/li>\n<li><strong>BEFORE|AFTER\uff1a<\/strong>\u6307\u5b9a\u89f8\u767c\u5668\u5728\u4e8b\u4ef6\u767c\u751f\u4e4b\u524d\u9084\u662f\u4e4b\u5f8c\u57f7\u884c\u3002<\/li>\n<li><strong>INSERT|UPDATE|DELETE\uff1a<\/strong>\u6307\u5b9a\u89f8\u767c\u5668\u97ff\u61c9\u7684\u4e8b\u4ef6\u985e\u578b\u3002<\/li>\n<li><strong>ON \u8868\u540d\u7a31\uff1a<\/strong>\u6307\u5b9a\u89f8\u767c\u5668\u6240\u95dc\u806f\u7684\u8868\u3002<\/li>\n<li><strong>FOR EACH ROW\uff1a<\/strong>\u8868\u793a\u5c0d\u65bc\u6bcf\u4e00\u884c\u7684\u8b8a\u66f4\u90fd\u6703\u57f7\u884c\u89f8\u767c\u5668\u3002<\/li>\n<li><strong>BEGIN &#8230; END\uff1a<\/strong>\u5b9a\u7fa9\u89f8\u767c\u5668\u7684\u5177\u9ad4\u908f\u8f2f\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%af%84%e4%be%8b%ef%bc%9a%e5%89%b5%e5%bb%ba%e4%b8%80%e5%80%8b%e7%b0%a1%e5%96%ae%e7%9a%84%e8%a7%b8%e7%99%bc%e5%99%a8-VjhaIFntwB\">\u7bc4\u4f8b\uff1a\u5275\u5efa\u4e00\u500b\u7c21\u55ae\u7684\u89f8\u767c\u5668<\/h2>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba <code>employees<\/code> \u7684\u8868\uff0c\u7576\u6709\u65b0\u54e1\u5de5\u88ab\u63d2\u5165\u6642\uff0c\u6211\u5011\u5e0c\u671b\u81ea\u52d5\u8a18\u9304\u63d2\u5165\u7684\u6642\u9593\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u6cd5\u5275\u5efa\u89f8\u767c\u5668\uff1a<\/p>\n<pre><code>CREATE TRIGGER before_insert_employees\n    BEFORE INSERT\n    ON employees\n    FOR EACH ROW\n    BEGIN\n        SET NEW.created_at = NOW();\n    END;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u7576\u6709\u65b0\u54e1\u5de5\u63d2\u5165\u5230 <code>employees<\/code> \u8868\u6642\uff0c\u89f8\u767c\u5668\u6703\u81ea\u52d5\u5c07\u7576\u524d\u6642\u9593\u8a2d\u7f6e\u5230 <code>created_at<\/code> \u6b04\u4f4d\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-VjhaIFntwB\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528\u89f8\u767c\u5668\u6642\uff0c\u6709\u5e7e\u9ede\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li>\u89f8\u767c\u5668\u7684\u57f7\u884c\u53ef\u80fd\u6703\u5f71\u97ff\u6027\u80fd\uff0c\u7279\u5225\u662f\u5728\u9ad8\u983b\u7387\u7684\u6578\u64da\u64cd\u4f5c\u4e2d\u3002<\/li>\n<li>\u89f8\u767c\u5668\u7684\u908f\u8f2f\u61c9\u8a72\u7c21\u55ae\u660e\u77ad\uff0c\u907f\u514d\u904e\u65bc\u8907\u96dc\u7684\u64cd\u4f5c\u3002<\/li>\n<li>\u5728\u8abf\u8a66\u89f8\u767c\u5668\u6642\uff0c\u53ef\u80fd\u9700\u8981\u4f7f\u7528 <code>SHOW TRIGGERS;<\/code> \u4f86\u67e5\u770b\u5df2\u5275\u5efa\u7684\u89f8\u767c\u5668\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-VjhaIFntwB\">\u7e3d\u7d50<\/h2>\n<p>MySQL \u89f8\u767c\u5668\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u81ea\u52d5\u5316\u6578\u64da\u64cd\u4f5c\uff0c\u7dad\u8b77\u6578\u64da\u5b8c\u6574\u6027\u3002\u901a\u904e\u6b63\u78ba\u4f7f\u7528\u89f8\u767c\u5668\uff0c\u53ef\u4ee5\u63d0\u9ad8\u6578\u64da\u5eab\u7684\u6548\u7387\u548c\u53ef\u9760\u6027\u3002\u82e5\u60a8\u9700\u8981\u9032\u4e00\u6b65\u4e86\u89e3\u5982\u4f55\u5728 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u4e0a\u90e8\u7f72 MySQL \u6578\u64da\u5eab\uff0c\u6216\u662f\u5c0b\u627e\u5176\u4ed6\u76f8\u95dc\u7684 <a href=\"https:\/\/server.hk\">\u4f3a\u670d\u5668<\/a> \u89e3\u6c7a\u65b9\u6848\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u8cc7\u8a0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5275\u5efa MySQL \u89f8\u767c\u5668\u7684\u8a9e\u6cd5\uff0c\u638c\u63e1\u5982\u4f55\u81ea\u52d5\u57f7\u884c\u7279\u5b9a\u64cd\u4f5c\u4ee5\u589e\u5f37\u6578\u64da\u5eab\u529f\u80fd\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-153051","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/153051","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"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=153051"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/153051\/revisions"}],"predecessor-version":[{"id":153052,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/153051\/revisions\/153052"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=153051"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=153051"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=153051"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}