{"id":142715,"date":"2024-10-31T23:04:19","date_gmt":"2024-10-31T15:04:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/142715\/"},"modified":"2024-10-31T23:04:20","modified_gmt":"2024-10-31T15:04:20","slug":"sql-server-%e8%a7%b8%e7%99%bc%e5%99%a8%e4%bf%9d%e6%8c%81%e6%95%b8%e6%93%9a%e5%ba%ab%e5%ae%8c%e6%95%b4%e6%80%a7%e7%9a%84%e5%af%a6%e9%9a%9b%e6%87%89%e7%94%a8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/142715\/","title":{"rendered":"SQL Server \u89f8\u767c\u5668\u4fdd\u6301\u6578\u64da\u5eab\u5b8c\u6574\u6027\u7684\u5be6\u969b\u61c9\u7528"},"content":{"rendered":"<h1 id=\"sql-server-%e8%a7%b8%e7%99%bc%e5%99%a8%e4%bf%9d%e6%8c%81%e6%95%b8%e6%93%9a%e5%ba%ab%e5%ae%8c%e6%95%b4%e6%80%a7%e7%9a%84%e5%af%a6%e9%9a%9b%e6%87%89%e7%94%a8-IvbfbEwwog\">SQL Server \u89f8\u767c\u5668\u4fdd\u6301\u6578\u64da\u5eab\u5b8c\u6574\u6027\u7684\u5be6\u969b\u61c9\u7528<\/h1>\n<p>\u5728\u73fe\u4ee3\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u6578\u64da\u7684\u5b8c\u6574\u6027\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002SQL Server \u63d0\u4f9b\u4e86\u591a\u7a2e\u5de5\u5177\u4f86\u78ba\u4fdd\u6578\u64da\u7684\u6e96\u78ba\u6027\u548c\u4e00\u81f4\u6027\uff0c\u5176\u4e2d\u4e4b\u4e00\u5c31\u662f\u89f8\u767c\u5668\uff08Triggers\uff09\u3002\u89f8\u767c\u5668\u662f\u4e00\u7a2e\u7279\u6b8a\u7684\u5b58\u5132\u904e\u7a0b\uff0c\u6703\u5728\u7279\u5b9a\u4e8b\u4ef6\u767c\u751f\u6642\u81ea\u52d5\u57f7\u884c\u3002\u672c\u6587\u5c07\u63a2\u8a0e SQL Server \u89f8\u767c\u5668\u7684\u5be6\u969b\u61c9\u7528\uff0c\u4e26\u5982\u4f55\u5229\u7528\u5b83\u5011\u4f86\u4fdd\u6301\u6578\u64da\u5eab\u7684\u5b8c\u6574\u6027\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e8%a7%b8%e7%99%bc%e5%99%a8%ef%bc%9f-IvbfbEwwog\">\u4ec0\u9ebc\u662f\u89f8\u767c\u5668\uff1f<\/h2>\n<p>\u89f8\u767c\u5668\u662f\u4e00\u7a2e\u81ea\u52d5\u57f7\u884c\u7684\u7a0b\u5e8f\uff0c\u7576\u5c0d\u6578\u64da\u5eab\u8868\u9032\u884c\u63d2\u5165\u3001\u66f4\u65b0\u6216\u522a\u9664\u64cd\u4f5c\u6642\uff0c\u89f8\u767c\u5668\u6703\u81ea\u52d5\u88ab\u89f8\u767c\u3002SQL Server \u4e2d\u7684\u89f8\u767c\u5668\u4e3b\u8981\u5206\u70ba\u5169\u7a2e\u985e\u578b\uff1a<\/p>\n<ul>\n<li><strong>\u884c\u7d1a\u89f8\u767c\u5668\uff08Row-level Triggers\uff09<\/strong>\uff1a\u5c0d\u6bcf\u4e00\u884c\u6578\u64da\u7684\u8b8a\u66f4\u90fd\u6703\u89f8\u767c\u3002<\/li>\n<li><strong>\u8a9e\u53e5\u7d1a\u89f8\u767c\u5668\uff08Statement-level Triggers\uff09<\/strong>\uff1a\u53ea\u5728\u6574\u500b\u8a9e\u53e5\u57f7\u884c\u5f8c\u89f8\u767c\u4e00\u6b21\u3002<\/li>\n<\/ul>\n<h2 id=\"%e8%a7%b8%e7%99%bc%e5%99%a8%e7%9a%84%e6%87%89%e7%94%a8%e5%a0%b4%e6%99%af-IvbfbEwwog\">\u89f8\u767c\u5668\u7684\u61c9\u7528\u5834\u666f<\/h2>\n<p>\u89f8\u767c\u5668\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\u6709\u591a\u7a2e\u61c9\u7528\u5834\u666f\uff0c\u4ee5\u4e0b\u662f\u5e7e\u500b\u5e38\u898b\u7684\u4f8b\u5b50\uff1a<\/p>\n<h3 id=\"1-%e6%95%b8%e6%93%9a%e9%a9%97%e8%ad%89-IvbfbEwwog\">1. \u6578\u64da\u9a57\u8b49<\/h3>\n<p>\u89f8\u767c\u5668\u53ef\u4ee5\u7528\u4f86\u9a57\u8b49\u6578\u64da\u7684\u6709\u6548\u6027\u3002\u4f8b\u5982\uff0c\u5728\u63d2\u5165\u6216\u66f4\u65b0\u64cd\u4f5c\u4e4b\u524d\uff0c\u6aa2\u67e5\u67d0\u500b\u5b57\u6bb5\u7684\u503c\u662f\u5426\u7b26\u5408\u7279\u5b9a\u689d\u4ef6\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>CREATE TRIGGER trg_CheckAge\nON Employees\nFOR INSERT, UPDATE\nAS\nBEGIN\n    IF EXISTS (SELECT * FROM inserted WHERE Age &lt; 18)\n    BEGIN\n        RAISERROR ('\u54e1\u5de5\u5e74\u9f61\u5fc5\u9808\u5927\u65bc\u6216\u7b49\u65bc 18 \u6b72', 16, 1);\n        ROLLBACK TRANSACTION;\n    END\nEND<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u7576\u5617\u8a66\u63d2\u5165\u6216\u66f4\u65b0\u54e1\u5de5\u5e74\u9f61\u5c0f\u65bc 18 \u7684\u8a18\u9304\u6642\uff0c\u89f8\u767c\u5668\u6703\u5f15\u767c\u932f\u8aa4\u4e26\u56de\u6efe\u4ea4\u6613\u3002<\/p>\n<h3 id=\"2-%e5%af%a6%e7%8f%be%e5%af%a9%e8%a8%88%e5%8a%9f%e8%83%bd-IvbfbEwwog\">2. \u5be6\u73fe\u5be9\u8a08\u529f\u80fd<\/h3>\n<p>\u89f8\u767c\u5668\u4e5f\u53ef\u4ee5\u7528\u4f86\u8a18\u9304\u6578\u64da\u7684\u8b8a\u66f4\uff0c\u9019\u5c0d\u65bc\u5be9\u8a08\u548c\u8ffd\u8e64\u6578\u64da\u8b8a\u66f4\u975e\u5e38\u6709\u7528\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u8a18\u9304\u522a\u9664\u64cd\u4f5c\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>CREATE TRIGGER trg_AuditDelete\nON Employees\nFOR DELETE\nAS\nBEGIN\n    INSERT INTO AuditLog (EmployeeID, DeletedAt)\n    SELECT ID, GETDATE() FROM deleted;\nEND<\/code><\/pre>\n<p>\u9019\u500b\u89f8\u767c\u5668\u6703\u5728\u522a\u9664\u54e1\u5de5\u8a18\u9304\u6642\uff0c\u5c07\u88ab\u522a\u9664\u7684\u54e1\u5de5 ID \u548c\u522a\u9664\u6642\u9593\u8a18\u9304\u5230\u5be9\u8a08\u65e5\u8a8c\u8868\u4e2d\u3002<\/p>\n<h3 id=\"3-%e8%87%aa%e5%8b%95%e6%9b%b4%e6%96%b0%e7%9b%b8%e9%97%9c%e6%95%b8%e6%93%9a-IvbfbEwwog\">3. \u81ea\u52d5\u66f4\u65b0\u76f8\u95dc\u6578\u64da<\/h3>\n<p>\u89f8\u767c\u5668\u9084\u53ef\u4ee5\u7528\u4f86\u81ea\u52d5\u66f4\u65b0\u5176\u4ed6\u8868\u4e2d\u7684\u6578\u64da\u3002\u4f8b\u5982\uff0c\u7576\u67d0\u500b\u7522\u54c1\u7684\u50f9\u683c\u66f4\u65b0\u6642\uff0c\u81ea\u52d5\u66f4\u65b0\u76f8\u95dc\u7684\u8a02\u55ae\u8a18\u9304\uff1a<\/p>\n<pre><code>CREATE TRIGGER trg_UpdateOrderPrice\nON Products\nFOR UPDATE\nAS\nBEGIN\n    UPDATE Orders\n    SET TotalPrice = TotalPrice * (SELECT NewPrice \/ OldPrice FROM inserted, deleted)\n    WHERE ProductID IN (SELECT ID FROM inserted);\nEND<\/code><\/pre>\n<p>\u9019\u500b\u89f8\u767c\u5668\u6703\u5728\u7522\u54c1\u50f9\u683c\u66f4\u65b0\u6642\uff0c\u81ea\u52d5\u8abf\u6574\u6240\u6709\u76f8\u95dc\u8a02\u55ae\u7684\u7e3d\u50f9\u683c\u3002<\/p>\n<h2 id=\"%e8%a7%b8%e7%99%bc%e5%99%a8%e7%9a%84%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-IvbfbEwwog\">\u89f8\u767c\u5668\u7684\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u96d6\u7136\u89f8\u767c\u5668\u5728\u4fdd\u6301\u6578\u64da\u5b8c\u6574\u6027\u65b9\u9762\u975e\u5e38\u6709\u7528\uff0c\u4f46\u5728\u4f7f\u7528\u6642\u4e5f\u9700\u8981\u8b39\u614e\uff1a<\/p>\n<ul>\n<li>\u904e\u591a\u7684\u89f8\u767c\u5668\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\u4ee5\u907f\u514d\u96e3\u4ee5\u8abf\u8a66\u7684\u554f\u984c\u3002<\/li>\n<li>\u61c9\u907f\u514d\u5728\u89f8\u767c\u5668\u4e2d\u57f7\u884c\u9577\u6642\u9593\u904b\u884c\u7684\u64cd\u4f5c\uff0c\u4ee5\u514d\u9020\u6210\u6b7b\u9396\u6216\u6027\u80fd\u74f6\u9838\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-IvbfbEwwog\">\u7e3d\u7d50<\/h2>\n<p>SQL Server \u89f8\u767c\u5668\u662f\u4e00\u7a2e\u5f37\u5927\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u5e6b\u52a9\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u4fdd\u6301\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027\u3002\u901a\u904e\u9069\u7576\u7684\u4f7f\u7528\u89f8\u767c\u5668\uff0c\u53ef\u4ee5\u5be6\u73fe\u6578\u64da\u9a57\u8b49\u3001\u5be9\u8a08\u548c\u81ea\u52d5\u66f4\u65b0\u7b49\u529f\u80fd\u3002\u7136\u800c\uff0c\u5728\u8a2d\u8a08\u548c\u5be6\u65bd\u89f8\u767c\u5668\u6642\uff0c\u5fc5\u9808\u8003\u616e\u6027\u80fd\u548c\u53ef\u7dad\u8b77\u6027\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u7ba1\u7406\u7684\u4f01\u696d\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\u53ef\u4ee5\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\uff0c\u78ba\u4fdd\u6578\u64da\u5eab\u7684\u9ad8\u6548\u904b\u884c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22 SQL Server \u89f8\u767c\u5668\u5728\u4fdd\u6301\u6578\u64da\u5eab\u5b8c\u6574\u6027\u4e2d\u7684\u5be6\u969b\u61c9\u7528\uff0c\u78ba\u4fdd\u6578\u64da\u6e96\u78ba\u6027\u8207\u4e00\u81f4\u6027\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-142715","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/142715","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=142715"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/142715\/revisions"}],"predecessor-version":[{"id":142716,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/142715\/revisions\/142716"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=142715"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=142715"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=142715"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}