{"id":77424,"date":"2024-10-16T10:47:15","date_gmt":"2024-10-16T02:47:15","guid":{"rendered":"https:\/\/server.hk\/cnblog\/77424\/"},"modified":"2024-10-16T10:47:16","modified_gmt":"2024-10-16T02:47:16","slug":"mysql%e8%88%87sql%e7%9a%84%e8%a7%b8%e7%99%bc%e5%99%a8%e7%9a%84%e4%b8%8d%e5%90%8c%e5%af%ab%e6%b3%95","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/77424\/","title":{"rendered":"MySQL\u8207SQL\u7684\u89f8\u767c\u5668\u7684\u4e0d\u540c\u5beb\u6cd5"},"content":{"rendered":"<h1 id=\"mysql%e8%88%87sql%e7%9a%84%e8%a7%b8%e7%99%bc%e5%99%a8%e7%9a%84%e4%b8%8d%e5%90%8c%e5%af%ab%e6%b3%95-ATiTdzBKzi\">MySQL\u8207SQL\u7684\u89f8\u767c\u5668\u7684\u4e0d\u540c\u5beb\u6cd5<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u89f8\u767c\u5668\uff08Trigger\uff09\u662f\u4e00\u7a2e\u7279\u6b8a\u7684\u5132\u5b58\u7a0b\u5e8f\uff0c\u5b83\u6703\u5728\u7279\u5b9a\u4e8b\u4ef6\u767c\u751f\u6642\u81ea\u52d5\u57f7\u884c\u3002\u89f8\u767c\u5668\u901a\u5e38\u7528\u65bc\u81ea\u52d5\u5316\u67d0\u4e9b\u64cd\u4f5c\uff0c\u4f8b\u5982\u5728\u63d2\u5165\u3001\u66f4\u65b0\u6216\u522a\u9664\u8cc7\u6599\u6642\u9032\u884c\u6578\u64da\u9a57\u8b49\u6216\u8a18\u9304\u8b8a\u66f4\u3002\u96d6\u7136MySQL\u548cSQL Server\u90fd\u652f\u6301\u89f8\u767c\u5668\uff0c\u4f46\u5b83\u5011\u7684\u8a9e\u6cd5\u548c\u529f\u80fd\u5b58\u5728\u4e00\u4e9b\u5dee\u7570\u3002\u672c\u6587\u5c07\u63a2\u8a0eMySQL\u8207SQL Server\u4e2d\u89f8\u767c\u5668\u7684\u4e0d\u540c\u5beb\u6cd5\u53ca\u5176\u7279\u9ede\u3002<\/p>\n<h2 id=\"mysql%e4%b8%ad%e7%9a%84%e8%a7%b8%e7%99%bc%e5%99%a8-ATiTdzBKzi\">MySQL\u4e2d\u7684\u89f8\u767c\u5668<\/h2>\n<p>\u5728MySQL\u4e2d\uff0c\u89f8\u767c\u5668\u7684\u5275\u5efa\u8a9e\u6cd5\u76f8\u5c0d\u7c21\u55ae\u3002\u4ee5\u4e0b\u662f\u5275\u5efa\u4e00\u500b\u57fa\u672c\u89f8\u767c\u5668\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>CREATE TRIGGER before_insert_example\nBEFORE INSERT ON example_table\nFOR EACH ROW\nBEGIN\n    SET NEW.created_at = NOW();\nEND;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u7bc4\u4f8b\u4e2d\uff0c\u7576\u5c0d`example_table`\u9032\u884c\u63d2\u5165\u64cd\u4f5c\u6642\uff0c\u89f8\u767c\u5668\u6703\u81ea\u52d5\u5c07`created_at`\u6b04\u4f4d\u8a2d\u7f6e\u70ba\u7576\u524d\u6642\u9593\u3002MySQL\u652f\u6301\u4e09\u7a2e\u89f8\u767c\u5668\uff1aBEFORE\u3001AFTER\u548cINSTEAD OF\uff0c\u5206\u5225\u5728\u63d2\u5165\u3001\u66f4\u65b0\u6216\u522a\u9664\u64cd\u4f5c\u4e4b\u524d\u6216\u4e4b\u5f8c\u57f7\u884c\u3002<\/p>\n<h3 id=\"mysql%e8%a7%b8%e7%99%bc%e5%99%a8%e7%9a%84%e7%89%b9%e9%bb%9e-ATiTdzBKzi\">MySQL\u89f8\u767c\u5668\u7684\u7279\u9ede<\/h3>\n<ul>\n<li>\u652f\u6301BEFORE\u548cAFTER\u89f8\u767c\u5668\u3002<\/li>\n<li>\u53ef\u4ee5\u4f7f\u7528NEW\u548cOLD\u95dc\u9375\u5b57\u4f86\u5f15\u7528\u65b0\u820a\u6578\u64da\u3002<\/li>\n<li>\u89f8\u767c\u5668\u7684\u57f7\u884c\u4e0d\u6703\u5f71\u97ff\u539f\u59cb\u64cd\u4f5c\u7684\u7d50\u679c\u3002<\/li>\n<\/ul>\n<h2 id=\"sql-server%e4%b8%ad%e7%9a%84%e8%a7%b8%e7%99%bc%e5%99%a8-ATiTdzBKzi\">SQL Server\u4e2d\u7684\u89f8\u767c\u5668<\/h2>\n<p>\u5728SQL Server\u4e2d\uff0c\u89f8\u767c\u5668\u7684\u5275\u5efa\u8a9e\u6cd5\u7565\u6709\u4e0d\u540c\u3002\u4ee5\u4e0b\u662f\u5275\u5efa\u4e00\u500b\u57fa\u672c\u89f8\u767c\u5668\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>CREATE TRIGGER trgAfterInsert\nON example_table\nAFTER INSERT\nAS\nBEGIN\n    UPDATE example_table\n    SET created_at = GETDATE()\n    WHERE id IN (SELECT id FROM inserted);\nEND;<\/code><\/pre>\n<p>\u9019\u500b\u7bc4\u4f8b\u4e2d\uff0c\u7576\u5c0d`example_table`\u9032\u884c\u63d2\u5165\u64cd\u4f5c\u5f8c\uff0c\u89f8\u767c\u5668\u6703\u81ea\u52d5\u66f4\u65b0`created_at`\u6b04\u4f4d\u70ba\u7576\u524d\u6642\u9593\u3002SQL Server\u540c\u6a23\u652f\u6301AFTER\u548cINSTEAD OF\u89f8\u767c\u5668\uff0c\u4f46\u4e0d\u652f\u6301BEFORE\u89f8\u767c\u5668\u3002<\/p>\n<h3 id=\"sql-server%e8%a7%b8%e7%99%bc%e5%99%a8%e7%9a%84%e7%89%b9%e9%bb%9e-ATiTdzBKzi\">SQL Server\u89f8\u767c\u5668\u7684\u7279\u9ede<\/h3>\n<ul>\n<li>\u50c5\u652f\u6301AFTER\u548cINSTEAD OF\u89f8\u767c\u5668\u3002<\/li>\n<li>\u4f7f\u7528`inserted`\u548c`deleted`\u8868\u4f86\u5f15\u7528\u65b0\u820a\u6578\u64da\u3002<\/li>\n<li>\u89f8\u767c\u5668\u7684\u57f7\u884c\u53ef\u4ee5\u5f71\u97ff\u539f\u59cb\u64cd\u4f5c\u7684\u7d50\u679c\u3002<\/li>\n<\/ul>\n<h2 id=\"mysql%e8%88%87sql-server%e8%a7%b8%e7%99%bc%e5%99%a8%e7%9a%84%e6%af%94%e8%bc%83-ATiTdzBKzi\">MySQL\u8207SQL Server\u89f8\u767c\u5668\u7684\u6bd4\u8f03<\/h2>\n<p>\u96d6\u7136MySQL\u548cSQL Server\u90fd\u652f\u6301\u89f8\u767c\u5668\uff0c\u4f46\u5b83\u5011\u5728\u8a9e\u6cd5\u548c\u529f\u80fd\u4e0a\u6709\u4e00\u4e9b\u986f\u8457\u7684\u5dee\u7570\uff1a<\/p>\n<ul>\n<li><strong>\u89f8\u767c\u5668\u985e\u578b\uff1a<\/strong>MySQL\u652f\u6301BEFORE\u548cAFTER\u89f8\u767c\u5668\uff0c\u800cSQL Server\u50c5\u652f\u6301AFTER\u548cINSTEAD OF\u89f8\u767c\u5668\u3002<\/li>\n<li><strong>\u6578\u64da\u5f15\u7528\uff1a<\/strong>MySQL\u4f7f\u7528NEW\u548cOLD\u95dc\u9375\u5b57\u4f86\u5f15\u7528\u65b0\u820a\u6578\u64da\uff0c\u800cSQL Server\u4f7f\u7528`inserted`\u548c`deleted`\u8868\u3002<\/li>\n<li><strong>\u57f7\u884c\u5f71\u97ff\uff1a<\/strong>\u5728SQL Server\u4e2d\uff0c\u89f8\u767c\u5668\u7684\u57f7\u884c\u53ef\u4ee5\u5f71\u97ff\u539f\u59cb\u64cd\u4f5c\u7684\u7d50\u679c\uff0c\u800cMySQL\u5247\u4e0d\u6703\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-ATiTdzBKzi\">\u7d50\u8ad6<\/h2>\n<p>\u89f8\u767c\u5668\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u4e2d\u626e\u6f14\u8457\u91cd\u8981\u7684\u89d2\u8272\uff0c\u80fd\u5920\u81ea\u52d5\u5316\u8a31\u591a\u64cd\u4f5c\u3002\u4e86\u89e3MySQL\u8207SQL Server\u4e2d\u89f8\u767c\u5668\u7684\u4e0d\u540c\u5beb\u6cd5\u53ca\u5176\u7279\u9ede\uff0c\u5c0d\u65bc\u958b\u767c\u8005\u5728\u9078\u64c7\u5408\u9069\u7684\u8cc7\u6599\u5eab\u7cfb\u7d71\u6642\u81f3\u95dc\u91cd\u8981\u3002\u7121\u8ad6\u662f\u9078\u64c7MySQL\u9084\u662fSQL Server\uff0c\u638c\u63e1\u89f8\u767c\u5668\u7684\u4f7f\u7528\u90fd\u80fd\u63d0\u9ad8\u8cc7\u6599\u5eab\u7684\u6548\u7387\u548c\u53ef\u9760\u6027\u3002<\/p>\n<p>\u5982\u9700\u4e86\u89e3\u66f4\u591a\u95dc\u65bc<code><a href=\"https:\/\/server.hk\">VPS<\/a><\/code>\u3001<code><a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a><\/code>\u53ca\u5176\u4ed6\u76f8\u95dc\u670d\u52d9\u7684\u4fe1\u606f\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22MySQL\u8207SQL\u4e2d\u89f8\u767c\u5668\u7684\u4e0d\u540c\u5beb\u6cd5\uff0c\u4e86\u89e3\u8a9e\u6cd5\u5dee\u7570\u53ca\u4f7f\u7528\u5834\u666f\uff0c\u63d0\u5347\u6578\u64da\u5eab\u7ba1\u7406\u6548\u7387\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-77424","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/77424","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=77424"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/77424\/revisions"}],"predecessor-version":[{"id":77425,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/77424\/revisions\/77425"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=77424"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=77424"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=77424"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}