{"id":187506,"date":"2024-11-11T14:50:19","date_gmt":"2024-11-11T06:50:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/187506\/"},"modified":"2024-11-11T14:50:20","modified_gmt":"2024-11-11T06:50:20","slug":"%e6%95%b8%e6%93%9a%e5%ba%ab%e5%be%aa%e7%92%b0-%e6%8f%90%e9%ab%98%e6%95%b8%e6%93%9a%e8%99%95%e7%90%86%e6%95%88%e7%8e%87%e7%9a%84%e5%88%a9%e5%99%a8-%e6%95%b8%e6%93%9a%e5%ba%abloop","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/187506\/","title":{"rendered":"\u6578\u64da\u5eab\u5faa\u74b0\u2014\u2014\u63d0\u9ad8\u6578\u64da\u8655\u7406\u6548\u7387\u7684\u5229\u5668 (\u6578\u64da\u5eabloop)"},"content":{"rendered":"<h1 id=\"%e6%95%b8%e6%93%9a%e5%ba%ab%e5%be%aa%e7%92%b0-%e6%8f%90%e9%ab%98%e6%95%b8%e6%93%9a%e8%99%95%e7%90%86%e6%95%88%e7%8e%87%e7%9a%84%e5%88%a9%e5%99%a8-hNBIzGuMsa\">\u6578\u64da\u5eab\u5faa\u74b0\u2014\u2014\u63d0\u9ad8\u6578\u64da\u8655\u7406\u6548\u7387\u7684\u5229\u5668<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u6548\u7387\u5c0d\u65bc\u4f01\u696d\u7684\u904b\u71df\u81f3\u95dc\u91cd\u8981\u3002\u96a8\u8457\u6578\u64da\u91cf\u7684\u6fc0\u589e\uff0c\u5982\u4f55\u6709\u6548\u5730\u8655\u7406\u548c\u7ba1\u7406\u9019\u4e9b\u6578\u64da\u6210\u70ba\u4e86\u8a31\u591a\u4f01\u696d\u9762\u81e8\u7684\u6311\u6230\u3002\u6578\u64da\u5eab\u5faa\u74b0\uff08Database Loop\uff09\u4f5c\u70ba\u4e00\u7a2e\u63d0\u9ad8\u6578\u64da\u8655\u7406\u6548\u7387\u7684\u6280\u8853\uff0c\u6b63\u9010\u6f38\u53d7\u5230\u91cd\u8996\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u6578\u64da\u5eab\u5faa\u74b0\u7684\u6982\u5ff5\u3001\u512a\u52e2\u53ca\u5176\u5728\u5be6\u969b\u61c9\u7528\u4e2d\u7684\u793a\u4f8b\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e6%95%b8%e6%93%9a%e5%ba%ab%e5%be%aa%e7%92%b0%ef%bc%9f-hNBIzGuMsa\">\u4ec0\u9ebc\u662f\u6578\u64da\u5eab\u5faa\u74b0\uff1f<\/h2>\n<p>\u6578\u64da\u5eab\u5faa\u74b0\u662f\u6307\u5728\u6578\u64da\u5eab\u64cd\u4f5c\u4e2d\uff0c\u901a\u904e\u8ff4\u5708\u7d50\u69cb\u4f86\u6279\u91cf\u8655\u7406\u6578\u64da\u7684\u904e\u7a0b\u3002\u9019\u7a2e\u65b9\u6cd5\u901a\u5e38\u7528\u65bc\u9700\u8981\u5c0d\u5927\u91cf\u6578\u64da\u9032\u884c\u76f8\u4f3c\u64cd\u4f5c\u7684\u60c5\u6cc1\uff0c\u4f8b\u5982\u66f4\u65b0\u3001\u522a\u9664\u6216\u63d2\u5165\u6578\u64da\u3002\u6578\u64da\u5eab\u5faa\u74b0\u53ef\u4ee5\u6709\u6548\u6e1b\u5c11\u591a\u6b21\u8a2a\u554f\u6578\u64da\u5eab\u7684\u958b\u92b7\uff0c\u5f9e\u800c\u63d0\u9ad8\u6574\u9ad4\u7684\u6578\u64da\u8655\u7406\u6548\u7387\u3002<\/p>\n<h2 id=\"%e6%95%b8%e6%93%9a%e5%ba%ab%e5%be%aa%e7%92%b0%e7%9a%84%e5%84%aa%e5%8b%a2-hNBIzGuMsa\">\u6578\u64da\u5eab\u5faa\u74b0\u7684\u512a\u52e2<\/h2>\n<ul>\n<li><strong>\u63d0\u9ad8\u6548\u7387\uff1a<\/strong>\u901a\u904e\u6279\u91cf\u8655\u7406\u6578\u64da\uff0c\u6578\u64da\u5eab\u5faa\u74b0\u53ef\u4ee5\u986f\u8457\u6e1b\u5c11\u57f7\u884c\u6642\u9593\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\u3002<\/li>\n<li><strong>\u6e1b\u5c11\u8cc7\u6e90\u6d88\u8017\uff1a<\/strong>\u6bcf\u6b21\u8a2a\u554f\u6578\u64da\u5eab\u90fd\u6703\u6d88\u8017\u8cc7\u6e90\uff0c\u4f7f\u7528\u5faa\u74b0\u53ef\u4ee5\u6e1b\u5c11\u9019\u7a2e\u6d88\u8017\uff0c\u5f9e\u800c\u964d\u4f4e\u7cfb\u7d71\u8ca0\u64d4\u3002<\/li>\n<li><strong>\u7c21\u5316\u4ee3\u78bc\uff1a<\/strong>\u4f7f\u7528\u5faa\u74b0\u7d50\u69cb\u53ef\u4ee5\u4f7f\u4ee3\u78bc\u66f4\u52a0\u7c21\u6f54\uff0c\u6613\u65bc\u7dad\u8b77\u548c\u7406\u89e3\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%95%b8%e6%93%9a%e5%ba%ab%e5%be%aa%e7%92%b0%e7%9a%84%e5%af%a6%e9%9a%9b%e6%87%89%e7%94%a8%e7%a4%ba%e4%be%8b-hNBIzGuMsa\">\u6578\u64da\u5eab\u5faa\u74b0\u7684\u5be6\u969b\u61c9\u7528\u793a\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528 SQL \u7684\u6578\u64da\u5eab\u5faa\u74b0\u793a\u4f8b\uff0c\u8a72\u793a\u4f8b\u5c55\u793a\u4e86\u5982\u4f55\u6279\u91cf\u66f4\u65b0\u7528\u6236\u7684\u72c0\u614b\uff1a<\/p>\n<pre><code>DECLARE @UserID INT\nDECLARE @NewStatus VARCHAR(10)\n\nDECLARE UserCursor CURSOR FOR\nSELECT UserID FROM Users WHERE Status = 'Inactive'\n\nOPEN UserCursor\nFETCH NEXT FROM UserCursor INTO @UserID\n\nWHILE @@FETCH_STATUS = 0\nBEGIN\n    SET @NewStatus = 'Active'\n    UPDATE Users SET Status = @NewStatus WHERE UserID = @UserID\n    FETCH NEXT FROM UserCursor INTO @UserID\nEND\n\nCLOSE UserCursor\nDEALLOCATE UserCursor\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u4f7f\u7528\u4e86\u6e38\u6a19\uff08Cursor\uff09\u4f86\u904d\u6b77\u6240\u6709\u72c0\u614b\u70ba &#8216;Inactive&#8217; 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