{"id":197696,"date":"2024-11-14T09:57:25","date_gmt":"2024-11-14T01:57:25","guid":{"rendered":"https:\/\/server.hk\/cnblog\/197696\/"},"modified":"2024-11-14T09:57:27","modified_gmt":"2024-11-14T01:57:27","slug":"%e5%88%a9%e7%94%a8sql-server%e6%b8%b8%e6%a8%99%e4%bf%ae%e6%94%b9%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%9a%84%e6%95%b8%e6%93%9a","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/197696\/","title":{"rendered":"\u5229\u7528SQL Server\u6e38\u6a19\u4fee\u6539\u6578\u64da\u5eab\u4e2d\u7684\u6578\u64da"},"content":{"rendered":"<h1 id=\"%e5%88%a9%e7%94%a8sql-server%e6%b8%b8%e6%a8%99%e4%bf%ae%e6%94%b9%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%9a%84%e6%95%b8%e6%93%9a-CZxQuqRWWc\">\u5229\u7528SQL Server\u6e38\u6a19\u4fee\u6539\u6578\u64da\u5eab\u4e2d\u7684\u6578\u64da<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0cSQL Server\u63d0\u4f9b\u4e86\u591a\u7a2e\u65b9\u6cd5\u4f86\u64cd\u4f5c\u548c\u4fee\u6539\u6578\u64da\u3002\u5176\u4e2d\uff0c\u6e38\u6a19\uff08Cursor\uff09\u662f\u4e00\u7a2e\u91cd\u8981\u7684\u5de5\u5177\uff0c\u80fd\u5920\u9010\u884c\u8655\u7406\u67e5\u8a62\u7d50\u679c\u96c6\uff0c\u4e26\u5c0d\u6bcf\u4e00\u884c\u6578\u64da\u9032\u884c\u64cd\u4f5c\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u5982\u4f55\u5229\u7528SQL Server\u6e38\u6a19\u4f86\u4fee\u6539\u6578\u64da\u5eab\u4e2d\u7684\u6578\u64da\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e6%b8%b8%e6%a8%99%ef%bc%9f-CZxQuqRWWc\">\u4ec0\u9ebc\u662f\u6e38\u6a19\uff1f<\/h2>\n<p>\u6e38\u6a19\u662f\u4e00\u7a2e\u6578\u64da\u5eab\u5c0d\u8c61\uff0c\u5141\u8a31\u7528\u6236\u9010\u884c\u8a2a\u554f\u67e5\u8a62\u7d50\u679c\u96c6\u3002\u8207\u6279\u91cf\u64cd\u4f5c\u4e0d\u540c\uff0c\u6e38\u6a19\u80fd\u5920\u5c0d\u6bcf\u4e00\u884c\u6578\u64da\u9032\u884c\u7cbe\u7d30\u7684\u63a7\u5236\uff0c\u9019\u5728\u9700\u8981\u9010\u884c\u8655\u7406\u6578\u64da\u7684\u60c5\u6cc1\u4e0b\u7279\u5225\u6709\u7528\u3002\u6e38\u6a19\u7684\u4f7f\u7528\u5834\u666f\u5305\u62ec\u4f46\u4e0d\u9650\u65bc\u6578\u64da\u66f4\u65b0\u3001\u6578\u64da\u522a\u9664\u548c\u6578\u64da\u63d2\u5165\u7b49\u64cd\u4f5c\u3002<\/p>\n<h2 id=\"%e6%b8%b8%e6%a8%99%e7%9a%84%e9%a1%9e%e5%9e%8b-CZxQuqRWWc\">\u6e38\u6a19\u7684\u985e\u578b<\/h2>\n<p>\u5728SQL Server\u4e2d\uff0c\u6e38\u6a19\u4e3b\u8981\u6709\u4ee5\u4e0b\u5e7e\u7a2e\u985e\u578b\uff1a<\/p>\n<ul>\n<li><strong>\u975c\u614b\u6e38\u6a19\uff08Static Cursor\uff09<\/strong>\uff1a\u63d0\u4f9b\u4e00\u500b\u975c\u614b\u7684\u7d50\u679c\u96c6\uff0c\u5c0d\u65bc\u7d50\u679c\u96c6\u7684\u8b8a\u66f4\u4e0d\u6703\u53cd\u6620\u5728\u6e38\u6a19\u4e2d\u3002<\/li>\n<li><strong>\u52d5\u614b\u6e38\u6a19\uff08Dynamic Cursor\uff09<\/strong>\uff1a\u80fd\u5920\u53cd\u6620\u7d50\u679c\u96c6\u7684\u8b8a\u66f4\uff0c\u9069\u5408\u9700\u8981\u5373\u6642\u66f4\u65b0\u7684\u5834\u666f\u3002<\/li>\n<li><strong>\u5feb\u7167\u6e38\u6a19\uff08Snapshot Cursor\uff09<\/strong>\uff1a\u985e\u4f3c\u65bc\u975c\u614b\u6e38\u6a19\uff0c\u4f46\u5728\u6e38\u6a19\u6253\u958b\u6642\u6355\u7372\u7d50\u679c\u96c6\u7684\u5feb\u7167\u3002<\/li>\n<li><strong>\u524d\u5411\u6e38\u6a19\uff08Forward-Only Cursor\uff09<\/strong>\uff1a\u53ea\u80fd\u5411\u524d\u79fb\u52d5\uff0c\u9069\u5408\u53ea\u9700\u8b80\u53d6\u6578\u64da\u7684\u60c5\u6cc1\u3002<\/li>\n<\/ul>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e6%b8%b8%e6%a8%99%e4%bf%ae%e6%94%b9%e6%95%b8%e6%93%9a%e7%9a%84%e6%ad%a5%e9%a9%9f-CZxQuqRWWc\">\u4f7f\u7528\u6e38\u6a19\u4fee\u6539\u6578\u64da\u7684\u6b65\u9a5f<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4f7f\u7528\u6e38\u6a19\u4fee\u6539\u6578\u64da\u7684\u57fa\u672c\u6b65\u9a5f\uff1a<\/p>\n<ol>\n<li>\u5ba3\u544a\u6e38\u6a19\uff1a\u5b9a\u7fa9\u8981\u64cd\u4f5c\u7684\u67e5\u8a62\u3002<\/li>\n<li>\u6253\u958b\u6e38\u6a19\uff1a\u57f7\u884c\u67e5\u8a62\u4e26\u7372\u53d6\u7d50\u679c\u96c6\u3002<\/li>\n<li>\u63d0\u53d6\u6578\u64da\uff1a\u9010\u884c\u63d0\u53d6\u6578\u64da\u4e26\u9032\u884c\u64cd\u4f5c\u3002<\/li>\n<li>\u66f4\u65b0\u6578\u64da\uff1a\u6839\u64da\u9700\u8981\u4fee\u6539\u6578\u64da\u3002<\/li>\n<li>\u95dc\u9589\u6e38\u6a19\uff1a\u5b8c\u6210\u64cd\u4f5c\u5f8c\u95dc\u9589\u6e38\u6a19\u3002<\/li>\n<li>\u91cb\u653e\u8cc7\u6e90\uff1a\u91cb\u653e\u6e38\u6a19\u4f54\u7528\u7684\u8cc7\u6e90\u3002<\/li>\n<\/ol>\n<h2 id=\"%e7%a4%ba%e4%be%8b%e4%bb%a3%e7%a2%bc-CZxQuqRWWc\">\u793a\u4f8b\u4ee3\u78bc<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528\u6e38\u6a19\u4f86\u66f4\u65b0\u6578\u64da\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>\nDECLARE @EmployeeID INT, @NewSalary DECIMAL(10, 2)\n\n-- \u5ba3\u544a\u6e38\u6a19\nDECLARE EmployeeCursor CURSOR FOR\nSELECT EmployeeID, Salary FROM Employees WHERE Department = 'Sales'\n\n-- \u6253\u958b\u6e38\u6a19\nOPEN EmployeeCursor\n\n-- \u63d0\u53d6\u6578\u64da\nFETCH NEXT FROM EmployeeCursor INTO @EmployeeID, @NewSalary\n\nWHILE @@FETCH_STATUS = 0\nBEGIN\n    -- \u66f4\u65b0\u85aa\u6c34\n    UPDATE Employees\n    SET Salary = @NewSalary * 1.1 -- \u589e\u52a010%\n    WHERE EmployeeID = @EmployeeID\n\n    -- \u7e7c\u7e8c\u63d0\u53d6\u4e0b\u4e00\u884c\n    FETCH NEXT FROM EmployeeCursor INTO @EmployeeID, @NewSalary\nEND\n\n-- \u95dc\u9589\u6e38\u6a19\nCLOSE EmployeeCursor\n-- \u91cb\u653e\u8cc7\u6e90\nDEALLOCATE EmployeeCursor\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u9996\u5148\u5ba3\u544a\u4e86\u4e00\u500b\u6e38\u6a19\uff0c\u9078\u64c7\u4e86\u201cSales\u201d\u90e8\u9580\u7684\u6240\u6709\u54e1\u5de5\u3002\u7136\u5f8c\uff0c\u6211\u5011\u9010\u884c\u63d0\u53d6\u6bcf\u4f4d\u54e1\u5de5\u7684ID\u548c\u85aa\u6c34\uff0c\u4e26\u5c07\u85aa\u6c34\u589e\u52a010%\u3002\u6700\u5f8c\uff0c\u6211\u5011\u95dc\u9589\u4e26\u91cb\u653e\u4e86\u6e38\u6a19\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-CZxQuqRWWc\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u96d6\u7136\u6e38\u6a19\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\u975e\u5e38\u6709\u7528\uff0c\u4f46\u5b83\u5011\u4e5f\u6709\u4e00\u4e9b\u7f3a\u9ede\u3002\u4f7f\u7528\u6e38\u6a19\u53ef\u80fd\u6703\u5c0e\u81f4\u6027\u80fd\u4e0b\u964d\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\u3002\u56e0\u6b64\uff0c\u5728\u4f7f\u7528\u6e38\u6a19\u4e4b\u524d\uff0c\u61c9\u8a72\u8003\u616e\u662f\u5426\u53ef\u4ee5\u4f7f\u7528\u5176\u4ed6\u65b9\u6cd5\uff08\u5982\u6279\u91cf\u66f4\u65b0\uff09\u4f86\u9054\u6210\u76f8\u540c\u7684\u76ee\u7684\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-CZxQuqRWWc\">\u7e3d\u7d50<\/h2>\n<p>\u5229\u7528SQL Server\u6e38\u6a19\u4f86\u4fee\u6539\u6578\u64da\u5eab\u4e2d\u7684\u6578\u64da\u662f\u4e00\u7a2e\u6709\u6548\u7684\u6280\u8853\uff0c\u7279\u5225\u662f\u5728\u9700\u8981\u9010\u884c\u8655\u7406\u6578\u64da\u7684\u60c5\u6cc1\u4e0b\u3002\u96d6\u7136\u6e38\u6a19\u63d0\u4f9b\u4e86\u9748\u6d3b\u6027\uff0c\u4f46\u5728\u4f7f\u7528\u6642\u4e5f\u9700\u8b39\u614e\uff0c\u4ee5\u907f\u514d\u6027\u80fd\u554f\u984c\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u7528\u6236\uff0c\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\u81f3\u95dc\u91cd\u8981\u3002\u82e5\u60a8\u5c0d\u65bc<code><a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a><\/code>\u6216<code><a href=\"https:\/\/server.hk\">\u96f2\u4f3a\u670d\u5668<\/a><\/code>\u6709\u8208\u8da3\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u4fe1\u606f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u5229\u7528SQL Server\u6e38\u6a19\u6709\u6548\u5730\u4fee\u6539\u6578\u64da\u5eab\u4e2d\u7684\u6578\u64da\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\u6548\u7387\u548c\u9748\u6d3b\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-197696","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/197696","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=197696"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/197696\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=197696"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=197696"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=197696"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}