{"id":158481,"date":"2024-11-03T02:13:23","date_gmt":"2024-11-02T18:13:23","guid":{"rendered":"https:\/\/server.hk\/cnblog\/158481\/"},"modified":"2024-11-03T02:13:24","modified_gmt":"2024-11-02T18:13:24","slug":"%e6%9b%b4%e6%96%b0%e5%af%a6%e7%8f%be-sql-server-%e9%80%90%e8%a1%8c%e6%9b%b4%e6%96%b0%e7%9a%84%e6%9c%89%e6%95%88%e6%96%b9%e5%bc%8f%ef%bc%88sql-server-%e9%80%90%e8%a1%8c%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/158481\/","title":{"rendered":"\u66f4\u65b0\u5be6\u73fe SQL Server \u9010\u884c\u66f4\u65b0\u7684\u6709\u6548\u65b9\u5f0f\uff08SQL Server \u9010\u884c\uff09"},"content":{"rendered":"<h1 id=\"%e6%9b%b4%e6%96%b0%e5%af%a6%e7%8f%be-sql-server-%e9%80%90%e8%a1%8c%e6%9b%b4%e6%96%b0%e7%9a%84%e6%9c%89%e6%95%88%e6%96%b9%e5%bc%8f%ef%bc%88sql-server-%e9%80%90%e8%a1%8c%ef%bc%89-ORXdMNNRMa\">\u66f4\u65b0\u5be6\u73fe SQL Server \u9010\u884c\u66f4\u65b0\u7684\u6709\u6548\u65b9\u5f0f\uff08SQL Server \u9010\u884c\uff09<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u4e2d\uff0cSQL Server \u662f\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u95dc\u806f\u5f0f\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u3002\u7576\u9700\u8981\u5c0d\u8cc7\u6599\u8868\u4e2d\u7684\u591a\u689d\u8a18\u9304\u9032\u884c\u66f4\u65b0\u6642\uff0c\u9010\u884c\u66f4\u65b0\uff08Row-by-Row Update\uff09\u662f\u4e00\u7a2e\u5e38\u898b\u7684\u64cd\u4f5c\u65b9\u5f0f\u3002\u9019\u7bc7\u6587\u7ae0\u5c07\u63a2\u8a0e\u5982\u4f55\u6709\u6548\u5730\u5728 SQL Server \u4e2d\u5be6\u73fe\u9010\u884c\u66f4\u65b0\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u6700\u4f73\u5be6\u8e10\u548c\u7bc4\u4f8b\u4ee3\u78bc\u3002<\/p>\n<h2 id=\"%e9%80%90%e8%a1%8c%e6%9b%b4%e6%96%b0%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-ORXdMNNRMa\">\u9010\u884c\u66f4\u65b0\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u9010\u884c\u66f4\u65b0\u662f\u6307\u5c0d\u8cc7\u6599\u8868\u4e2d\u7684\u6bcf\u4e00\u689d\u8a18\u9304\u9032\u884c\u55ae\u7368\u7684\u66f4\u65b0\u64cd\u4f5c\u3002\u9019\u7a2e\u65b9\u6cd5\u5728\u9700\u8981\u6839\u64da\u7279\u5b9a\u689d\u4ef6\u6216\u8a08\u7b97\u7d50\u679c\u4f86\u66f4\u65b0\u8cc7\u6599\u6642\u7279\u5225\u6709\u7528\u3002\u96d6\u7136\u9010\u884c\u66f4\u65b0\u53ef\u4ee5\u63d0\u4f9b\u9748\u6d3b\u6027\uff0c\u4f46\u5728\u8655\u7406\u5927\u91cf\u8cc7\u6599\u6642\uff0c\u6027\u80fd\u53ef\u80fd\u6703\u53d7\u5230\u5f71\u97ff\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e6%b8%b8%e6%a8%99%e9%80%b2%e8%a1%8c%e9%80%90%e8%a1%8c%e6%9b%b4%e6%96%b0-ORXdMNNRMa\">\u4f7f\u7528\u6e38\u6a19\u9032\u884c\u9010\u884c\u66f4\u65b0<\/h2>\n<p>\u5728 SQL Server \u4e2d\uff0c\u6e38\u6a19\uff08Cursor\uff09\u662f\u4e00\u7a2e\u7528\u65bc\u9010\u884c\u8655\u7406\u67e5\u8a62\u7d50\u679c\u7684\u5de5\u5177\u3002\u4f7f\u7528\u6e38\u6a19\u53ef\u4ee5\u9010\u884c\u8b80\u53d6\u8cc7\u6599\u4e26\u9032\u884c\u66f4\u65b0\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528\u6e38\u6a19\u9032\u884c\u9010\u884c\u66f4\u65b0\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>DECLARE @id INT, @newValue VARCHAR(100);\n\nDECLARE myCursor CURSOR FOR\nSELECT id, value FROM myTable WHERE condition = 'some_condition';\n\nOPEN myCursor;\n\nFETCH NEXT FROM myCursor INTO @id, @newValue;\n\nWHILE @@FETCH_STATUS = 0\nBEGIN\n    -- \u66f4\u65b0\u64cd\u4f5c\n    UPDATE myTable\n    SET value = @newValue\n    WHERE id = @id;\n\n    FETCH NEXT FROM myCursor INTO @id, @newValue;\nEND\n\nCLOSE myCursor;\nDEALLOCATE myCursor;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u7bc4\u4f8b\u4e2d\uff0c\u6211\u5011\u9996\u5148\u5ba3\u544a\u4e86\u4e00\u500b\u6e38\u6a19\uff0c\u7136\u5f8c\u9010\u884c\u8b80\u53d6\u8cc7\u6599\u4e26\u9032\u884c\u66f4\u65b0\u3002\u9019\u7a2e\u65b9\u6cd5\u96d6\u7136\u7c21\u55ae\uff0c\u4f46\u5728\u8655\u7406\u5927\u91cf\u8cc7\u6599\u6642\u53ef\u80fd\u6703\u5c0e\u81f4\u6027\u80fd\u554f\u984c\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8-while-%e5%be%aa%e7%92%b0%e9%80%b2%e8%a1%8c%e9%80%90%e8%a1%8c%e6%9b%b4%e6%96%b0-ORXdMNNRMa\">\u4f7f\u7528 WHILE \u5faa\u74b0\u9032\u884c\u9010\u884c\u66f4\u65b0<\/h2>\n<p>\u53e6\u4e00\u7a2e\u9010\u884c\u66f4\u65b0\u7684\u65b9\u6cd5\u662f\u4f7f\u7528 WHILE \u5faa\u74b0\u3002\u9019\u7a2e\u65b9\u6cd5\u4e0d\u9700\u8981\u4f7f\u7528\u6e38\u6a19\uff0c\u901a\u5e38\u5728\u6027\u80fd\u4e0a\u6703\u66f4\u597d\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528 WHILE \u5faa\u74b0\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>DECLARE @count INT = (SELECT COUNT(*) FROM myTable WHERE condition = 'some_condition');\nDECLARE @i INT = 1;\n\nWHILE @i &lt;= @count\nBEGIN\n    UPDATE myTable\n    SET value = 'new_value'\n    WHERE id = (SELECT id FROM myTable WHERE condition = 'some_condition' ORDER BY id OFFSET @i - 1 ROWS FETCH NEXT 1 ROWS ONLY);\n\n    SET @i = @i + 1;\nEND;<\/code><\/pre>\n<p>\u9019\u6bb5\u4ee3\u78bc\u9996\u5148\u8a08\u7b97\u7b26\u5408\u689d\u4ef6\u7684\u8a18\u9304\u6578\u91cf\uff0c\u7136\u5f8c\u4f7f\u7528 WHILE \u5faa\u74b0\u9010\u884c\u66f4\u65b0\u8cc7\u6599\u3002\u9019\u7a2e\u65b9\u6cd5\u5728\u6027\u80fd\u4e0a\u901a\u5e38\u512a\u65bc\u4f7f\u7528\u6e38\u6a19\u3002<\/p>\n<h2 id=\"%e6%9c%80%e4%bd%b3%e5%af%a6%e8%b8%90-ORXdMNNRMa\">\u6700\u4f73\u5be6\u8e10<\/h2>\n<ul>\n<li><strong>\u6279\u91cf\u66f4\u65b0\uff1a<\/strong>\u5982\u679c\u53ef\u80fd\uff0c\u8003\u616e\u4f7f\u7528\u6279\u91cf\u66f4\u65b0\u8a9e\u53e5\u4f86\u4e00\u6b21\u6027\u66f4\u65b0\u591a\u689d\u8a18\u9304\uff0c\u9019\u6a23\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u6027\u80fd\u3002<\/li>\n<li><strong>\u907f\u514d\u4f7f\u7528\u6e38\u6a19\uff1a<\/strong>\u9664\u975e\u5fc5\u8981\uff0c\u5426\u5247\u61c9\u907f\u514d\u4f7f\u7528\u6e38\u6a19\uff0c\u56e0\u70ba\u5b83\u5011\u901a\u5e38\u6703\u5c0e\u81f4\u6027\u80fd\u4e0b\u964d\u3002<\/li>\n<li><strong>\u4f7f\u7528\u4e8b\u52d9\uff1a<\/strong>\u5728\u9032\u884c\u591a\u689d\u8a18\u9304\u7684\u66f4\u65b0\u6642\uff0c\u4f7f\u7528\u4e8b\u52d9\u53ef\u4ee5\u78ba\u4fdd\u8cc7\u6599\u7684\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-ORXdMNNRMa\">\u7d50\u8ad6<\/h2>\n<p>\u9010\u884c\u66f4\u65b0\u5728 SQL Server \u4e2d\u662f\u4e00\u500b\u91cd\u8981\u7684\u64cd\u4f5c\uff0c\u5c24\u5176\u662f\u5728\u9700\u8981\u6839\u64da\u7279\u5b9a\u689d\u4ef6\u66f4\u65b0\u8cc7\u6599\u6642\u3002\u96d6\u7136\u4f7f\u7528\u6e38\u6a19\u548c WHILE \u5faa\u74b0\u90fd\u662f\u53ef\u884c\u7684\u65b9\u6cd5\uff0c\u4f46\u5728\u6027\u80fd\u4e0a\uff0c\u6279\u91cf\u66f4\u65b0\u548c\u907f\u514d\u6e38\u6a19\u7684\u4f7f\u7528\u901a\u5e38\u662f\u66f4\u597d\u7684\u9078\u64c7\u3002\u900f\u904e\u9075\u5faa\u6700\u4f73\u5be6\u8e10\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u63d0\u9ad8\u8cc7\u6599\u66f4\u65b0\u7684\u6548\u7387\u3002<\/p>\n<p>\u5982\u9700\u4e86\u89e3\u66f4\u591a\u6709\u95dc <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u548c\u5176\u4ed6\u4f3a\u670d\u5668\u89e3\u6c7a\u65b9\u6848\u7684\u4fe1\u606f\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22\u6709\u6548\u7684 SQL Server \u9010\u884c\u66f4\u65b0\u65b9\u6cd5\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\u6548\u7387\uff0c\u7c21\u5316\u6578\u64da\u7ba1\u7406\u6d41\u7a0b\uff0c\u5be6\u73fe\u66f4\u5feb\u7684\u6578\u64da\u66f4\u65b0\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-158481","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/158481","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=158481"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/158481\/revisions"}],"predecessor-version":[{"id":158482,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/158481\/revisions\/158482"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=158481"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=158481"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=158481"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}